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DESCRIPTION JP2012015874

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DESCRIPTION JP2012015874
An object of the present invention is to suppress an increase in thickness of a voice coil in a voice
coil speaker provided with a bobbin in which a multilayer voice coil is formed. An output bobbin
conductor (83) electrically connected to an audio signal processing circuit board is extended
along a bobbin (21a) and wound around the output bobbin conductor (83) from a rear end edge
(86) of a voice coil (22). The lead wire 91 was connected. [Selected figure] Figure 5
ボイスコイルスピーカー
[0001]
The present invention relates to a voice coil speaker in which a multilayer voice coil is formed on
a bobbin.
[0002]
In recent years, a voice coil speaker provided with a bobbin in which a multilayer voice coil is
formed has been proposed (see, for example, Patent Document 1).
Some voice coil speakers of this type are provided with a plurality of voice coils stacked in the
circumferential direction of the bobbin.
[0003]
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Unexamined-Japanese-Patent No. 2010-28785
[0004]
Here, in designing the speaker, it is necessary to design the size of the magnetic gap
corresponding to the distance between the plate sandwiching the voice coil and the yoke
according to the thickness of the voice coil formed on the bobbin. There is a need to make the
thickness of the voice coil as small as possible because the larger the value of V, the smaller the
magnetic flux formed by the voice coil and the larger the size of the speaker.
In particular, as described above, in the case where a plurality of voice coils are stacked in the
circumferential direction of the bobbin, the thickness of the voice coil as a whole tends to be
larger. Desired. The present invention has been made in view of the above-described
circumstances, and it is an object of the present invention to suppress an increase in thickness of
a voice coil in a voice coil speaker provided with a bobbin in which a multilayer voice coil is
formed.
[0005]
In order to achieve the above object, according to the present invention, in a voice coil speaker in
which a multilayer voice coil is formed on a bobbin, a first conductor conducted to a circuit board
processing an audio signal is extended along the bobbin A lead wire extending from a rear end
edge of the voice coil is connected to the first conductor.
[0006]
Further, according to the present invention, a plurality of voice coils of multiple layers are
formed on the bobbin by stacking a plurality of the voice coils in the circumferential direction of
the bobbin, and each of the voice coils is used as the lead wire on the bobbin. The first conductor
is formed by being wound in a single layer, and the lead wire extending from the rear end edge
of the voice coil is connected to the first conductor.
[0007]
Further, according to the present invention, the first conductor is provided for each of the
multilayer voice coils, and each of the first conductors is shaped to extend in the front-rear
direction along the voice coil, A contact for connecting the lead wire extending from the rear end
edge to the first conductor is provided at the rear of the voice coil in the first conductor.
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[0008]
Further, the present invention is characterized in that each of the first conductors is disposed at
substantially equal intervals.
[0009]
Further, the present invention further provides a second conductor which is electrically
connected to the circuit board and to which a lead wire extending from the front end edge of the
voice coil is connected, and each of the second conductors is connected to the voice coil. The
contact point for connecting the lead wire extending from the front end edge of the voice coil to
the second conductor is a front side of the voice coil in the second conductor. It is characterized
by being provided in
[0010]
Further, the present invention is characterized in that the first conductor and the second
conductor are alternately arranged at substantially equal intervals.
[0011]
Further, the present invention is characterized in that the bobbin is formed of a flexible printed
circuit, and the first conductor is patterned on the flexible printed circuit.
[0012]
Further, according to the present invention, a signal line portion formed of a flexible printed
circuit board provided with a signal line connecting the circuit board and each of the voice coils
is provided between the circuit board and the bobbin. The signal line provided in the signal line
portion is connected to the first conductor.
[0013]
Further, according to the present invention, the bobbin and the signal line portion are integrally
formed by one flexible printed circuit, and the signal line and the first conductor are integrally
formed by one conductive member. It is characterized by
[0014]
Further, according to the present invention, the bobbin and the signal line portion are formed of
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different flexible printed circuit boards, and the physical connection between the bobbin and the
signal line portion, and the signal line and the first conductor. And electrical connection with
each other are simultaneously performed.
[0015]
Further, the present invention is characterized in that the bobbin is formed of a flexible printed
board, and the first conductor and the second conductor are patterned on the flexible printed
board.
[0016]
Further, according to the present invention, a signal line portion formed of a flexible printed
circuit board provided with a signal line connecting the circuit board and each of the voice coils
is provided between the circuit board and the bobbin. Each of the signal lines provided in the
signal line portion is connected to each of the first conductor and the second conductor.
[0017]
Further, in the present invention, the bobbin and the signal line portion are integrally formed by
one flexible printed circuit board, and each of the signal lines and each of the first conductor and
the second conductor are formed. It is characterized in that it is integrally configured by one
conductive member.
[0018]
Further, according to the present invention, the bobbin and the signal line portion are formed of
separate flexible printed circuit boards, and the physical connection between the bobbin and the
signal line portion, and the signal line, and It is characterized in that electrical connection with
each of the first conductor and the second conductor is simultaneously performed.
[0019]
Further, the present invention is characterized in that an amplifier circuit is mounted on the
circuit board.
[0020]
Furthermore, the present invention is characterized in that multi-channel audio digital signals are
input to the circuit board.
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[0021]
According to the present invention, it is possible to suppress an increase in thickness of a voice
coil in a voice coil speaker including a bobbin in which a multilayer voice coil is formed.
[0022]
It is a figure showing a voice coil speaker concerning a 1st embodiment, (A) shows a front view
of a voice coil speaker, and (B) is an A-O-B sectional view of Drawing 1 (A).
It is a principal part enlarged view of FIG. 1 (B).
It is the figure which looked at the bobbin in which the voice coil was formed from the top.
FIG. 4 is an enlarged view of an essential part of the range IV of FIG. 1 (B).
It is a side view of a bobbin.
It is a figure which shows the bobbin before shape | molding by cylindrical shape.
It is VII-VII sectional drawing in FIG.
It is a principal part enlarged view of FIG.
It is a figure which shows the conventional voice coil, (A) shows the side view of a voice coil, (B)
is a IX-IX sectional view of Drawing 9 (A).
It is a figure which shows the conventional voice coil, (A) shows the side view of a voice coil, (B)
is XX sectional drawing of FIG. 10 (A).
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It is a figure which shows the bobbin which concerns on 2nd Embodiment, (A) shows the state
before a bobbin base and a signal line connection part are connected, (B) shows a bobbin base, a
signal line connection part, Indicates a connected state.
It is a figure which shows a mode that the bobbin base was expand | deployed.
It is a XIII-XIII sectional view of FIG.
It is a side view of the bobbin concerning a 3rd embodiment.
It is a figure which shows the bobbin before shape | molding by cylindrical shape.
It is a side view of the bobbin concerning a 4th embodiment, and (A) shows the state before a
bobbin base and a signal line connecting part are connected, (B) shows a bobbin base and a
signal line connecting part And indicate the connected state.
It is a figure which shows the bobbin which concerns on 5th Embodiment.
It is a figure which shows the bobbin which concerns on 6th Embodiment. It is a figure showing
the bobbin concerning a 7th embodiment. It is a figure which shows the voice coil speaker which
concerns on 8th Embodiment, (A) shows the front view of a voice coil speaker, (B) shows the side
view of a voice coil speaker. It is a figure which shows the voice coil speaker which concerns on
9th Embodiment, (A) shows the front view of a voice coil speaker, (B) shows the side view of a
voice coil speaker. It is a figure showing the bobbin concerning a 10th embodiment. It is a figure
which shows the signal input part which concerns on 11th Embodiment.
[0023]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. First Embodiment FIG. 1 is a view showing a voice coil speaker 1 according to the
present embodiment, and FIG. 1 (A) is a front view, and FIG. 1 (B) is an AO-- FIG. It is B sectional
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drawing. FIG. 2 is an enlarged view of a main part in FIG. In the drawing, the central axis of the
voice coil speaker 1 is shown with a symbol L1. The voice coil speaker 1 according to the present
embodiment is, for example, a speaker that is attached to the side of a door of a vehicle, receives
a digital audio signal from an on-vehicle audio, and outputs audio based on the digital audio
signal. As shown in FIG. 1, the voice coil speaker 1 has a circular bottomed speaker opening 10
formed on the front surface, and a bottomed cylindrical shape in which a speaker main body
housing portion 12 which is a space for housing the speaker main body 11 is formed. Speaker
frame 13 of FIG. At the rear of the speaker frame 13, a bowl-shaped frame rear 15 (FIG. 1 (B))
having a circular opening that is expanded in diameter toward the front and is formed on the
front is formed. The magnetic circuit unit 16 (FIG. 1 (B)) provided for driving the speaker main
body 11 is provided at the rear of the.
[0024]
The magnetic circuit portion 16 is provided with a yoke 16c having a yoke bottom portion 16a
on a disk and a cylindrical yoke convex portion 16b projecting forward at a central portion of the
yoke bottom portion 16a. An annular magnet 16d is fixed to the front surface of the yoke bottom
16a so as to surround the yoke projection 16b, and an annular plate 16e is fixed to the front of
the magnet 16d. A magnetic gap 16f (FIG. 4) is formed between the outer periphery of the yoke
convex portion 16b and the inner periphery of the plate 16e. The bobbin 21a and the bobbin
21a are formed in the magnetic gap 16f (FIG. 4). And a voice coil 22 formed by winding a tinsel
wire (lead wire).
[0025]
Further, the speaker frame 13 extends coaxially with the central axis L1 of the voice coil speaker
1 and extends outward along the circumferential direction of the opening from the edge of the
circular opening formed on the front surface of the rear portion 15 of the frame. An annular
frame flat portion 17 (FIG. 1 (B)) is formed. The base end of a cylindrical frame cylindrical
portion 18 having a circular speaker opening 10 formed on the front surface is connected to the
outer periphery of the frame flat portion 17 so as to increase in diameter toward the front. A
damper 20 is connected to an edge of a circular opening formed on the front of the frame rear
portion 15 so as to close the opening, and the center of the damper 20 extends coaxially with the
central axis L1 of the voice coil speaker 1 A cylindrical bobbin 21a is supported so that the
bobbin 21a is supported and fixed to the speaker frame 13. The damper 20 and the bobbin 21 a
are coaxially arranged such that their central axes coincide with the central axis L 1 of the voice
coil speaker 1.
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[0026]
FIG. 3 is a top view of the bobbin 21a. In this figure, in order to clarify the relationship between
the bobbin 21 a and the voice coil 22, the shapes of the bobbin 21 a and the voice coil 22 are
schematically described and then schematically shown. As shown in FIG. 3, the bobbin 21a holds
a plurality of voice coils 22 formed by aligning and winding lead wires made of a wire such as
copper wire in the axial direction of the bobbin 21a. In the present embodiment, a plurality of
voice coils 22 are provided so as to be multilayered in the circumferential direction of the bobbin
21a. Each voice coil 22 of each layer is electrically connected to an audio signal processing
circuit board 32 described later, and each of the voice coils 22 of each layer is based on a drive
signal input from the audio signal processing circuit board 32. Thus, the bobbin 21a is vibrated.
[0027]
Referring to FIGS. 1 and 2, the bobbin 21a is connected to a base end 25 of a conical diaphragm
24 whose diameter increases toward the front, and the outer periphery of the tip 26 of the
diaphragm 24 is It is connected to the inner periphery of the speaker opening 10 formed on the
front surface of the frame cylindrical portion 18 of the speaker frame 13. The diaphragm 24
vibrates in response to the vibration of the bobbin 21 a by the multi-layered voice coil 22, and
sound is output based on the vibration of the diaphragm 24.
[0028]
An annular frame flange 27 is provided on the outer periphery of the speaker opening 10 formed
on the front surface of the frame cylindrical portion 18 and extends outward along the
circumferential direction of the opening from the edge of the outer periphery, and this frame The
flange 27 is formed with a plurality of screw holes 28 (FIG. 1A). When the voice coil speaker 1 is
fixed to the side of a door of a vehicle, the voice coil speaker 1 is screwed to the door through the
screw holes 28.
[0029]
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Two bridges of an upper bridge 29 and a lower bridge 30 are connected and fixed to the frame
flange 27, and the disk-like audio signal processing circuit board 32 (circuit board) is made of a
diaphragm 24 by these two bridges. It is supported while being positioned so that its central axis
coincides with the central axis L1 of the voice coil speaker 1 more forwardly. More specifically,
as shown in FIG. 1, each of the two bridges is a flat plate member, and each of the base end
portions 33 is a frame in a state of being arranged to be a target with the central axis L1 as a
boundary. It is firmly fixed to the flange 27. The audio signal processing circuit board 32 is fixed
by screwing with screws 35 (FIG. 2) to each of the front end portions 34 of these bridges at
substantially the center of the speaker opening 10. An audio signal processing circuit board 32 is
supported and fixed to the speaker frame 13. As described above, in the present embodiment, by
disposing the audio signal processing circuit board 32 in front of the diaphragm 24, the space
formed in front of the diaphragm 24 is effectively used.
[0030]
Further, at the base end portion 33 of the lower bridge 30, a connector 36 to which an external
device as an output source of an audio signal such as a car audio system is connected is
provided. Then, one end 39 (FIG. 1) of the plurality of lead wires 38 is connected to the
connector 36, and the plurality of lead wires 38 are fixed and closely attached to the back
surface of the lower bridge 30. Along the line extending linearly toward the audio signal
processing circuit board 32, the other end 40 (FIG. 2) is connected to the audio signal processing
circuit board 32 via the circuit connection connector 41 (FIG. 2) . As described above, since the
lead wire 38 is disposed on the back of the lower bridge 30, the lead wire 38 is not exposed, and
the appearance is improved, and an external object (for example, one of the vehicle occupant's
bodies Contact to the lead wire 38 can be prevented as much as possible. Furthermore, since the
external device is connected, the connector 36 is provided at the outer edge of the voice coil
speaker 1 in consideration of the easiness of connection of the external device. And in this
embodiment, after providing the connector 36 in the vicinity of the base end part 33 of the lower
bridge 30, using the lower bridge 30 which is an essential member for supporting the audio
signal processing circuit board 32, Since the lead wire 38 interposed between the connector 36
and the audio signal processing circuit board 32 linearly extends, the length of the lead wire 38
can be shortened and at the same time the bending of the lead wire 38 is prevented. be able to.
[0031]
A tweeter 50 is provided on the front of the audio signal processing circuit board 32. The tweeter
50 is a speaker for emitting high directional voice with high directivity, and is formed by the
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tweeter yoke 51 (FIG. 2), a magnet accommodated in the tweeter yoke 51, and the tweeter yoke
51 and a magnet. A bobbin freely inserted into the magnetic gap, a voice coil wound around the
bobbin, a diaphragm connected to the bobbin, and the like are provided. In the present
embodiment, as shown in FIG. 2, the tweeter 50 is firmly fixed to the audio signal processing
circuit board 32 by screwing with a screw 53, and a terminal 54 extending rearward from the
tweeter 50. However, they are inserted directly into the through holes of the audio signal
processing circuit board 32 and are electrically connected by soldering, so that physical and
electrical connections can be made easily and reliably. The tweeter 50 outputs a sound when the
drive signal is input from the sound signal processing circuit board 32 to the voice coil via the
terminal 54 and the diaphragm vibrates.
[0032]
In addition, a box-shaped front shield cover 56 covering the tweeter 50 is provided on the front
surface of the audio signal processing circuit board 32, whereby the tweeter 50 and the front
surface of the audio signal processing circuit board 32 are mounted. Each circuit is protected. In
the approximate center of the front surface of the front shield cover 56, a notch 57 for
outputting sound properly from the tweeter 50 is formed. Similarly, on the rear surface of the
audio signal processing circuit board 32, a box-shaped rear shield cover 59 covering the rear
surface of the audio signal processing circuit board 32 is provided. Each circuit is protected. In
the present embodiment, the front shield cover 56 and the rear shield cover 59 are made of a
material having high thermal conductivity, but the reason will be described later.
[0033]
Here, the audio signal processing circuit board 32 will be described in detail. The audio signal
processing circuit board 32 is a circuit board formed in a disk shape, and is a circuit that
generates and outputs a drive signal for the voice coil 22 of each layer by performing various
digital processing on the input digital audio signal. Is a digital circuit board mounted. More
specifically, on the audio signal processing circuit board 32, circuits such as a ΔΣ modulation
circuit, various filter circuits, and a digital amplifier are mounted. The audio signal processing
circuit board 32 executes signal processing such as predetermined sampling processing and
predetermined filtering processing on multi-channel audio signals input from an external device
connected to the connector 36. Thus, the drive signal to be output to each voice coil 22 is
generated, and the generated drive signal is output to each of the voice coils 22. The bobbin 21a
vibrates in accordance with the drive signal input from the audio signal processing circuit board
32 to each voice coil 22, and the diaphragm 24 vibrates accordingly, and a sound is output.
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[0034]
Here, since each circuit mounted on the audio signal processing circuit board 32 is a digital
circuit, it can be much smaller than that formed by an analog circuit. In particular, the digital
amplifier is much smaller than the analog amplifier, and the amplifier circuit 64 for signal
amplification that constitutes this digital amplifier has a margin on the rear surface of the audio
signal processing circuit board 32, as shown in FIG. It can be arranged. In addition, since the
voice coil speaker 1 includes the audio signal processing circuit board 32 mounting all circuits
including the amplifier circuit 64 for signal amplification to the input digital audio signal, a
power amplifier or the like is provided in front of the voice coil speaker 1. There is no need to
intervene, and the voice coil speaker 1 alone constitutes a speaker amplifier system. As a result, it
is possible to realize the space saving particularly required for the on-vehicle speaker. Further, as
described above, each of the front shield cover 56 and the rear shield cover 59 is formed of a
member having high thermal conductivity. Due to this configuration, the heat generation of each
circuit including the amplifier circuit 64 is conducted to these shield covers, and cooling of each
circuit is promoted, and vibration of the bobbin 21 a and the diaphragm 24 by the drive of the
voice coil speaker 1 is caused. At the same time, air is blown to the shield covers, thereby
promoting cooling of the shield covers.
[0035]
FIG. 4 is an enlarged view of an essential part of the range IV of FIG. 1 (B). In designing the voice
coil speaker 1, according to the thickness of the voice coil 22 formed on the bobbin 21a, the size
of the magnetic gap 16f (FIG. 4) formed between the plate 16e and the yoke convex portion 16b
is designed. There is a need. Here, as the magnetic gap 16f is larger, the magnetic flux formed by
the voice coil 22 tends to be weaker in the magnetic gap 16f, which also leads to an increase in
size of the voice coil speaker 1, so the thickness of the voice coil 22 is as small as possible. There
is a need to. In particular, as described above, in the voice coil speaker 1 according to the present
embodiment, since the six voice coils 22 are provided so as to overlap in the circumferential
direction of the bobbin 21a, the total thickness of all six voice coils 22 is There is a tendency to
become larger, and it is more required to reduce the thickness of each of these voice coils 22.
Furthermore, as described above, in the present embodiment, the drive signal to be output to
each voice coil 22 is generated in the audio signal processing circuit board 32, and the generated
drive signal is output to each of the voice coils 22. For this reason, it is necessary to provide a
plurality of signal lines for drive signals in accordance with the number of layers of the voice coil
22 (six layers in this embodiment). At that time, in order to suppress the deterioration of the
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sound quality, it is required not to interfere with each of the plurality of signal lines, and also to
prevent the movement of the bobbin 21a from being disturbed by this signal line. Based on the
above, in the present embodiment, the members such as the bobbin 21a and the signal line are
configured as follows.
[0036]
FIG. 5 is a side view of the bobbin 21a in a state in which the voice coil 22 is wound, and FIG. 6 is
a view showing the bobbin 21a before being formed into a cylindrical shape. In the bobbin 21a
shown in FIG. 6, after the surface 61 (FIG. 6) which is the surface on which the contact point 77
is exposed is rounded so as to be the outer surface of the cylinder, the one end connecting
portion 62 and the other end connecting portion The cylindrical voice coil 22 shown in FIG. In
FIGS. 5 and 6, it is assumed that the front-rear direction is defined as indicated by the arrow in
the drawing. That is, it is assumed that the direction indicated by the arrow Y1 is the front, and
the direction indicated by the arrow Y2 is the rear. 7 is a cross-sectional view taken along the line
VII-VII in FIG. 6, and FIG. 8 is an enlarged view of an essential part of FIG.
[0037]
As shown in FIG. 6, the bobbin 21a before being formed into a cylindrical shape is provided with
a bobbin main portion 65 having a rectangular shape in a front view, from a part of the front end
66 extending in the longitudinal direction of the bobbin main portion 65 The signal line portion
67 is elongated. In the present embodiment, the bobbin main portion 65 and the signal line
portion 67 are integrally formed of a flexible printed circuit. Hereinafter, the bobbin main portion
65 of the bobbin 21a and the signal line portion 67 will be described in detail.
[0038]
The signal line portion 67 is a flexible printed circuit board, and a plurality of signal line
conductors 70 (FIG. 8) are formed as signal lines for drive signals output from the audio signal
processing circuit board 32 to the voice coil 22. There is. In particular, in the present
embodiment, the flexible printed circuit board is an FPC with a double-sided shield, and has a
configuration in which radiation noise due to digital signals is reduced. As shown in FIG. 8, each
of the signal line conductors 70 is a linear conductor, and arranged in the signal line portion 67
along the signal line portion 67 at predetermined intervals. . The signal line conductor 70 is a
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conductive member made of a thin film of metal such as copper, and is sandwiched by an
insulating film such as a polyimide film or a photo solder resist film to form another signal line
conductor 70 or the like. , Insulation from the outside is ensured, and also protected from
physical contact.
[0039]
Here, in one voice coil 22, signal lines for driving signals input from the audio signal processing
circuit board 32 to the voice coil 22 (hereinafter referred to as “input signal line” for
convenience) and the voice coil 22. It is necessary to connect two signal lines, that is, signal lines
for driving signals which pass through and return to the audio signal processing circuit board 32
(hereinafter referred to as “output signal lines” for convenience). In the present embodiment,
since the voice coil 22 of six layers is formed on the bobbin 21 a, the total of the six input signal
lines and the six output signal lines have a total of twelve signal lines, the voice coil 22. You need
to be connected to each one. In the signal line portion 67, twelve signal line conductors 70 are
formed corresponding to all the twelve signal lines.
[0040]
At the front end of the signal line portion 67, a signal line connector 71 is provided. The signal
line connector 71 is a connector connected to the circuit board connector 72 (FIG. 2) provided on
the audio signal processing circuit board 32, and the signal line connector 71 and the circuit
board connector 72 By being connected, an electrical connection between the audio signal
processing circuit board 32 and the signal line conductor 70 formed in the signal line portion 67
is realized, whereby the signal line conduction from the audio signal processing circuit board 32
is realized. The output of the drive signal to the voice coil 22 through the body 70 becomes
possible. As shown in FIG. 1 (B) and FIG. 2, when the signal line connector 71 and the circuit
board connector 72 are connected, the front end of the bobbin main portion 65 and the audio
signal through the signal line portion 67. The processing circuit board 32 is physically
connected. Here, since the bobbin 21a is a member that vibrates along with the voice output by
the voice coil speaker 1, the signal line portion 67 is provided with a bending portion (play
portion) in consideration of the stroke amount of the bobbin 21a. This prevents the smooth
vibration of the bobbin 21a from being hindered by the signal line portion 67. As shown in FIG.
2, the rear shield cover 59 is formed with a signal line through hole 73 for the signal line portion
67 to pass through.
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[0041]
Thus, in the present embodiment, the bobbin 21a (bobbin main portion 65) and the audio signal
processing circuit board 32 are connected via the signal line portion 67 formed of a flexible
printed circuit board, and further, the audio The signal processing circuit board 32 and each of
the voice coils 22 are electrically connected through the signal line conductor 70 formed in the
signal line portion 67. With such a configuration, the following effects can be obtained.
[0042]
That is, since the flexible printed circuit board is characterized by being thin and excellent in
flexibility, the audio signal processing circuit board 32 and the bobbin main portion 65 are
physically connected via the signal line portion 67. Even in the state (the state shown in FIG. 1 (B)
and FIG. 2), the signal line portion 67 can be inhibited from inhibiting the vibration of the bobbin
21a, and the deterioration of the sound quality can be prevented. In particular, in the present
embodiment, it is necessary to connect 12 signal lines from the audio signal processing circuit
board 32 to the voice coil 22 of the bobbin 21a, but temporarily, 12 lines from the audio signal
processing circuit board 32 to the bobbin 21a. If the tinsel wire is to be extended, the thickness
and arrangement of the tinsel wire must be strictly designed in consideration of the strength of
the tinsel wire and the smooth vibration of the bobbin 21a. However, in the present embodiment,
by utilizing the signal line portion 67 which is a flexible printed circuit board, smooth vibration
of the bobbin 21a can be ensured easily and surely. In addition, each of the signal lines
connected to the voice coil 22 is required not to electrically interfere in order to prevent
deterioration of the sound quality. In the present embodiment, since the signal line portion 67 is
a flexible printed board, the insulation state of each of the signal lines (the signal line conductors
70) can be reliably ensured, and electrical interference of the signal lines can be reliably
prevented. In particular, since the signal line is connected to the voice coil 22 wound around the
bobbin 21a, the vibration of the bobbin 21a accompanying the sound output is necessarily
transmitted to the signal line, but the bobbin 21a vibrated. Even if this is the case, interference
between signal lines can not occur. Furthermore, since each of the signal lines (the signal line
conductors 70) is formed of a conductive member printed on a flexible printed circuit, the signal
lines may be cut in response to the vibration of the bobbin 21a. It can be prevented as much as
possible.
[0043]
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Further, the signal line portion 67 is formed of a flexible printed circuit board, and electrically
connects each of the 12 signal lines (the signal line conductors 70 formed in the signal line
portion 67) to the audio signal processing circuit board 32. In this case, the signal line connector
71 of the signal line portion 67 and the circuit board connector 72 may be connected. Therefore,
the ease of manufacturing the voice coil speaker 1 is very high. This effect is remarkable, for
example, as compared with the case where each of the 12 signal lines is formed of tinsel wires,
and the voice signal processing circuit board 32 and the voice coil 22 are connected by each of
the tinsel wires. . Further, in the present embodiment, the voice coil 22 of six layers is formed on
the bobbin 21a, and the signal line is connected to each of the voice coils 22, so that the voice
coil 22 of one layer can be simplified. The current flowing in each signal line is 1/6 compared to
the case of. That is, the current flowing through each signal line is very small. Therefore, in the
signal line portion 67, the width of the signal line conductor 70 can be narrowed, and
accordingly, the width of the signal line portion 67 itself can be reduced. As a result, the
flexibility and flexibility of the signal line portion 67 which is a flexible printed board can be
largely secured, and the deterioration of the sound quality can be further prevented. Further, in
the present embodiment, one signal line portion 67 extends from the bobbin main portion 65,
and all the twelve signal lines are provided in the one signal line portion 67. For this reason,
compared with the case where a plurality of signal line portions 67 are provided, the vibration of
the bobbin 21a can be further prevented from being suppressed, and the deterioration of the
sound quality can be prevented.
[0044]
Next, the bobbin main portion 65 will be described in detail. The bobbin main portion 65 is
formed of a flexible printed circuit board, and as shown in FIG. 6, the bobbin conductors 75
extending in the front-rear direction and formed of a thin film of metal such as copper are spaced
approximately the same distance apart. Twelve pieces are patterned. Each of the bobbin
conductors 75 is sandwiched by an insulating film 74 (FIG. 7) such as a polyimide film or a photo
solder resist film, as shown in FIG. Insulation is ensured and protected from physical contact. In
particular, in the present embodiment, the flexible printed circuit board is an FPC with a doublesided shield, and has a configuration in which radiation noise due to digital signals is reduced.
[0045]
As shown in FIG. 6, on the surface 61 of the bobbin main portion 65, contacts 77 formed by
exposing the respective bobbin conductors 75 to the surface 61 are provided corresponding to
the respective bobbin conductors 75. There is. More specifically, as shown in FIG. 7, in the film
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74, a contact through hole 78 is formed in a portion corresponding to the contact 77, and the
bobbin conductor 75 has a surface 61 through the contact through hole 78. It is exposed to the
In the present embodiment, twelve bobbin conductors 75 are formed in the bobbin main portion
65, and a total of twelve contacts 77 are formed in each of the bobbin conductors 75 one by one.
[0046]
As shown in FIG. 6, the contact 77 is formed at the front of the bobbin conductor 75 (hereinafter
referred to as “contact for starting winding connection 79”) and at the rear of the bobbin
conductor 75 ( Hereinafter, there are two “wound end connecting contacts 80”), and these
contacts 77 are alternately formed in accordance with the arrangement of the bobbin conductor
75. Specifically, referring to FIG. 6, the contact 77 corresponding to the bobbin conductor 75a
shown at the top of FIG. 6 is a contact for start of winding connection 79 formed at the front of
the bobbin conductor 75a. The contact 77 corresponding to the bobbin conductor 75b adjacent
to the bobbin conductor 75a is a winding end connection contact 80 formed at the rear of the
bobbin conductor 75b, and is adjacent to the bobbin conductor 75b. The contact 77
corresponding to the bobbin conductor 75c is a contact 79 for winding start connection formed
at the front of the bobbin conductor 75c. Thus, in the bobbin main portion 65, six winding start
connection contacts 79 and six winding end connection contacts 80 are alternately arranged in
accordance with the arrangement of the bobbin conductors 75.
[0047]
The bobbin conductor 75 (hereinafter appropriately referred to as “input bobbin conductor 82
(second conductor)”) corresponding to the winding start connection contact 79 is one of the
signal line conductors 70 formed in the signal line portion 67. , A bobbin conductor 75
connected to the signal line conductor 70 corresponding to the input signal line described above,
and corresponding to the winding end connection contact 80 (hereinafter referred to as “the
output bobbin conductor 83 (first conductor) Is connected to the signal line conductor 70
corresponding to the above-mentioned output signal line among the signal line conductors 70
formed in the signal line portion 67. More specifically, referring to FIG. 6, the bobbin conductor
75a illustrated at the top of FIG. 6 is an input bobbin conductor 82 (second conductor)
corresponding to the winding start connection contact 79, The input bobbin conductor 82 is
connected to the signal line conductor 70 corresponding to the input signal line formed at the
top in FIG. 6 in the signal line portion 67, and the bobbin conductor 75b adjacent to the bobbin
conductor 75a. Is an output bobbin conductor 83 (first conductor) corresponding to the winding
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end connection contact 80. This output bobbin conductor 83 is an output signal line adjacent to
the signal line conductor 70 in the signal line portion 67. Are connected to the signal line
conductor 70 corresponding to. As described above, the signal line portion 67 and the bobbin
main portion 65 are integrally configured by one flexible printed circuit board, and correspond
to one bobbin conductor 75 and the bobbin conductor 75. The signal line conductor 70 is
integrally formed by patterning one conductive member on a flexible printed circuit. Hereinafter,
the relationship between one voice coil 22 of the six layers of voice coils 22, the winding start
connecting contact 79 corresponding to the voice coil 22, and the winding end connecting
contact 80, and their members The detailed configuration will be described.
[0048]
As shown in FIG. 5, the voice coil 22 is configured by winding a lead around the bobbin main
portion 65. In the present embodiment, all of the voice coils 22 are wound from the winding start
portion 85 of the front end edge 84 (where the winding of the lead wire starts) to the winding
end of the rear end edge 86 formed rearward of the front edge 84. It is formed by being wound
in a single turn toward the portion 87 (where the winding of the lead ends). From the winding
start portion 85, a pre-winding lead wire 90 which is a lead wire before winding is extended, and
from the winding end portion 87, a post-winding lead wire 91 which is a lead wire after winding
is extended. It's out. As shown in FIG. 5, the voice coil 22 is formed in the bobbin main portion 65
between the winding start connecting contact 79 and the winding end connecting contact 80.
The pre-wound lead wire 90 extending from the winding start portion 85 of the voice coil 22 is
connected (conductive) to the corresponding one of the winding start connection contacts 79 by
means such as soldering, and the winding end portion Post-winding lead wires 91 extending
from 87 are connected (conducted) to the corresponding one of the winding end connecting
contacts 80. Thereby, the audio signal processing circuit board 32 → signal line conductor 70
corresponding to the input signal line → input bobbin conductor 82 → contact for start of
winding connection 79 → lead before winding 90 → voice coil 22 → lead after winding A
subsequent electrical connection is established with the line 91 → winding end connection
contact 80 → output bobbin conductor 83 → signal line conductor 70 corresponding to the
output signal line → audio signal processing circuit board 32, and the audio signal processing
circuit board 32 Thus, the drive signal can be output to the voice coil 22.
[0049]
As described above, in the voice coil speaker 1 according to the present embodiment, the postwinding lead wire 91 extending from the rear end edge 86 of the voice coil 22 is electrically
11-04-2019
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connected to the bobbin main portion 65 of the bobbin 21a. An end connecting contact 80 is
formed, and a bobbin conductor 75 extending along the main bobbin portion 65 from the
winding end connecting contact 80 to the front of the front end edge 84 of the voice coil 22 is
formed. It has become. Therefore, the following effects are achieved.
[0050]
FIG. 9 is a view showing a conventional voice coil 22, in which (A) is a side view of the bobbin
21a on which the voice coil 22 is formed, and (B) is a cross section taken along the line IX-IX in
FIG. FIG. FIG. 10 is a view showing a conventional voice coil 22. (A) is a side view of the bobbin
21a on which the voice coil 22 is formed, and (B) is a cross section taken along the line X-X in
FIG. FIG. FIGS. 9 and 10 show a state in which one voice coil 22 is formed on the bobbin 21 a for
the convenience of description. In order to output a drive signal from the audio signal processing
circuit board 32 to the voice coil 22, a winding extending from the winding end portion 87 in
order to make the circuit to which the voice coil 22 is connected be a closed circuit. It is
necessary to establish an electrical connection between the lead wire 91 and the audio signal
processing circuit board 32.
[0051]
Conventionally, as shown in FIG. 9, when forming one voice coil 22, the lead wire is wound from
the front end edge 84 toward the rear end edge 86, and then folded back at the rear end edge
86, It was formed by winding again from the end edge 86 toward the front end edge 84. That is,
the voice coil 22 is formed by double winding the lead wire. As a result, the winding end 87 is
positioned at the front end edge 84 of the voice coil 22, and the post winding 91 from the
winding end 87 located at the front end edge 84 directly to the audio signal processing circuit
board 32, or I was able to connect indirectly. In this case, the lead wire is doubly wound to form
the voice coil 22, and the thickness of the voice coil 22 is increased accordingly. In particular, in
the present embodiment, since the voice coil 22 has six layers, when each of the six voice coils
22 is formed by double winding of the lead wire, the thickness of the voice coil 22 as a whole
becomes very large. In response to this, the width of the magnetic gap 16f is also designed to be
large, which may lead to the deterioration of the sound quality.
[0052]
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Also, conventionally, as shown in FIG. 10, when forming one voice coil 22, as in the present
embodiment, the lead wire is formed by winding from the front end edge 84 toward the rear end
edge 86. The Then, from the winding end portion 87 located at the rear end edge 86, the
winding post lead wire 91 is extended to the audio signal processing circuit board 32 side
through the magnetic gap 16f, whereby the winding post lead wire 91, voice The signal
processing circuit board 32 can be connected directly or indirectly. At that time, as shown in FIG.
10B, after winding, the lead wire 91 is adhered to the outer peripheral surface of the voice coil
22, thereby positioning the winding post lead wire 91 in the magnetic gap 16f. . In this case,
although the voice coil 22 can be single-wound and the thickness thereof can be reduced, the
magnetic gap 16f is taken into consideration by the post-winding lead wire 91 in consideration
of the post-winding lead wire 91 extending into the magnetic gap 16f. In addition, it is necessary
to form a notch in the plate 16e so that the lead wire 91 after winding extending to the magnetic
gap 16f does not contact the plate 16e. If the magnetic gap 16f is enlarged by the lead wire 91
after winding, the sound quality may be degraded as described above, and a notch or the like for
avoiding contact with the lead wire 91 after winding may be a plate 16e In the case where the
voice coil speaker 1 is formed, the shape of the plate 16e may be complicated, and the
manufacturability of the voice coil speaker 1 may be reduced as compared with the case where
the plate 16e is completely annular.
[0053]
On the other hand, in the present embodiment, the bobbin conductor 75 is patterned on the
bobbin main portion 65 which is a flexible printed board, and the bobbin conductor 75 extends
from the winding end portion 87 located at the rear end edge 86 of the voice coil 22. The postwinding lead wire 91 is connected, and the post-winding lead wire 91 and the audio signal
processing circuit board 32 are connected via the signal line conductor 70 integrally formed with
the bobbin conductor 75. To establish an electrical connection. For this reason, each of the voice
coils 22 is formed by double winding a lead wire, or after winding the lead wire 91 into the
magnetic gap 16f, the post-winding lead wire 91 is not formed. The connection with the audio
signal processing circuit board 32 can be reliably established, whereby the deterioration of the
sound quality due to the increase of the magnetic gap 16 f can be prevented, and the ease of
manufacture due to the complicated shape of the plate It can prevent.
[0054]
In particular, in the present embodiment, the signal line portion 67 and the bobbin main portion
65 are integrally formed by one flexible printed circuit. For this reason, compared with the case
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where the signal line portion 67 and the bobbin main portion 65 are formed by separate
members, the process for connecting the signal line portion 67 and the bobbin main portion 65
becomes unnecessary, and the voice coil The manufacturability of the speaker 1 is improved. In
particular, since each of the signal line conductors 70 formed in the signal line portion 67 and
each of the bobbin conductors 75 formed in the bobbin main portion 65 are integrally patterned
by the same conductive member, It is possible to improve manufacturability while reliably
maintaining the conductive state of these conductors.
[0055]
Further, referring to FIG. 6, in the present embodiment, in the bobbin main portion 65, the
output bobbin conductors 83 are arranged at substantially equal intervals. Therefore, for the
winding end connection contacts 80 formed on each of the output bobbin conductors 83, the
physical separation distance T1 (see FIG. 6) formed between the adjacent winding end
connection contacts 80 is the largest. The efficiency can be ensured, and thereby, the physical
separation distance of each of the after-winding lead wires 91 connected to the winding-end
connecting contacts 80 can be secured most widely and efficiently. 91 interference can be
effectively prevented. Similarly, in the present embodiment, in the bobbin main portion 65, the
input bobbin conductors 82 are arranged at substantially equal intervals. Therefore, with regard
to the winding start connection contacts 79 formed on each of the input bobbin conductors 82,
the physical separation distance T2 (see FIG. 6) formed between the winding start connection
contacts 79 adjacent to each other is the largest. The efficiency can be ensured, and thereby, the
physical separation distance of the pre-winding lead wires 90 connected to the winding start
connection contacts 79 can be secured most widely and efficiently. These pre-winding lead wires
90 interference can be effectively prevented. In particular, in the present embodiment, in the
bobbin main portion 65, the input bobbin conductors 82 and the output bobbin conductors 83
are alternately arranged at equal intervals. As a result, the separation distance T1 between the
adjacent winding end connection contacts 80 and the separation distance T2 between the
adjacent winding start connection contacts 79 can be secured at the same time as the widest and
most efficient lead after winding. Interference of the wire 91 and interference of the pre-wound
lead 90 can be prevented simultaneously.
[0056]
As described above, in the voice coil speaker 1 according to the present embodiment, the output
bobbin conductor 83 (first conductor) electrically connected to the audio signal processing
circuit board 32 is extended along the bobbin 21a, and this output bobbin The conductor 83 is
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connected to an after-winding lead wire 91 extending from the rear end edge 86 of the voice coil
22. According to this, each of the voice coils 22 is formed by doubly winding the lead wire, or the
post-winding lead wire 91 is not extended after being wound into the magnetic gap 16f. It is
possible to reliably establish the connection between 91 and the audio signal processing circuit
board 32, thereby preventing the deterioration of the sound quality due to the increase of the
magnetic gap 16f, and the easiness of manufacturing due to the complicated shape of the plate. It
is possible to prevent the decline.
[0057]
Further, in the voice coil speaker 1 according to the present embodiment, the voice coil 22 of
multiple layers is formed on the bobbin 21 a by providing a plurality (six) of voice coils 22
overlapped in the circumferential direction of the bobbin 21 a. Then, each of the voice coils 22 is
formed by winding a lead wire around the bobbin 21 a in a single layer, and after winding, the
output bobbin conductor 83 extends from the rear end edge 86 of the voice coil 22. The line 91
is connected. Here, as in the voice coil speaker 1 according to the present embodiment, in a
speaker provided with a plurality of voice coils 22 stacked in the circumferential direction of the
bobbin 21a, it is required to make the thickness of each voice coil 22 smaller. However, with the
above configuration, each voice coil 22 is formed by double winding the lead wire, or without
extending the lead wire 91 after winding into the magnetic gap 16 f. It is possible to prevent the
thickness of each of the voice coils 22 from increasing.
[0058]
Further, in the present embodiment, the output bobbin conductor 83 (first conductor) is provided
for each of the multilayer voice coils 22, and each of the output bobbin conductors 83 is
extended in the front-rear direction along the voice coil 22. An output bobbin conductor is
provided with a winding end connecting contact 80 for connecting an output bobbin conductor
83 with an after winding lead wire 91 having a shape and extending from the winding end
portion 87 of the rear end edge 86 of the voice coil 22. It is provided at the back of the voice coil
22 at 83. With such a configuration, the physical distance between the winding end portion 87 of
the rear end edge 86 of the voice coil 22 and the winding end connection contact 80 becomes
close, and the lead wire 91 can be easily wound after winding. It is possible to connect to the end
connecting contact 80 and shorten the length of the after winding lead wire 91 extending from
the winding end 87 toward the winding end connecting contact 80, and the interference of the
lead wire 91 after this winding Can be prevented.
11-04-2019
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[0059]
Further, in the present embodiment, in the bobbin main portion 65, the output bobbin
conductors 83 are arranged at substantially equal intervals. Therefore, for the winding end
connection contacts 80 formed on each of the output bobbin conductors 83, the physical
separation distance T1 (see FIG. 6) formed between the adjacent winding end connection
contacts 80 is the largest. The efficiency can be ensured, and thereby, the physical separation
distance of each of the after-winding lead wires 91 connected to the winding-end connecting
contacts 80 can be secured most widely and efficiently. 91 interference can be effectively
prevented.
[0060]
Further, in the voice coil speaker 1 according to the present embodiment, the input bobbin
conductor 82 is electrically connected to the audio signal processing circuit board 32 and
connected to the pre-wound lead wire 90 extending from the front end edge 84 of the voice coil
22 ( A second conductor is provided, and each of the input bobbin conductors 82 is shaped to
extend in the front-rear direction along the voice coil 22, and extends from the front end edge 84
of the voice coil 22. A winding start connecting contact 79 for connecting the wire 90 and the
input bobbin conductor 82 is provided in front of the voice coil 22 in the input bobbin conductor
82. As a result, by using the input bobbin conductor 82, the electrical connection between the
pre-winding lead wire 90 and the audio signal processing circuit board 32 can be established
smoothly. Furthermore, the physical distance between the winding start portion 85 of the front
end edge 84 of the voice coil 22 and the winding start connection contact 79 becomes close, and
the pre-winding lead wire 90 is easily connected to the winding start connection contact 79
Thus, the length of the pre-winding lead wire 90 extending from the winding start portion 85
toward the winding start connection contact 79 can be shortened, and the interference of the
pre-winding lead wire 90 can be prevented.
[0061]
Further, in the present embodiment, in the bobbin main portion 65, the input bobbin conductors
82 and the output bobbin conductors 83 are alternately arranged at equal intervals. As a result,
the separation distance T1 between the adjacent winding end connection contacts 80 and the
separation distance T2 between the adjacent winding start connection contacts 79 can be
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22
secured at the same time as the widest and most efficient lead after winding. Interference of the
wire 91 and interference of the pre-wound lead 90 can be prevented simultaneously.
[0062]
Further, in the present embodiment, the bobbin 21a is formed of a flexible printed board, and the
input bobbin conductor 82 (first conductor) is patterned on the bobbin 21a which is a flexible
printed board. Similarly, in the present embodiment, the output bobbin conductor 83 (second
conductor) is patterned on the bobbin 21a which is a flexible printed board. According to this,
the bobbin 21a on which the input bobbin conductor 82 and the output bobbin conductor 83 are
formed can be easily manufactured by the method for manufacturing a flexible printed circuit.
[0063]
Further, in the present embodiment, the flexible printed circuit board is formed by providing a
signal line connecting the audio signal processing circuit board 32 and each of the voice coils 22
between the audio signal processing circuit board 32 and the bobbin 21a. A signal line unit 67 is
provided. The signal line (signal line conductor 70) formed in the signal line portion 67 is
connected to each of the input bobbin conductor 82 and the output bobbin conductor 83.
According to this configuration, the voice signal processing circuit board 32 and the bobbin main
portion 65 are physically connected via the signal line portion 67 by utilizing the feature of the
flexible printed circuit board that is thin and excellent in flexibility. Even in the broken state (the
states shown in FIG. 1 (B) and FIG. 2), the signal line portion 67 can be inhibited from inhibiting
the vibration of the bobbin 21a, and the deterioration of the sound quality can be prevented.
[0064]
Further, in the present embodiment, one signal line portion 67 extends from the bobbin main
portion 65, and all the twelve signal lines are provided in the one signal line portion 67. For this
reason, compared with the case where a plurality of signal line parts 67 are provided, it is
possible to prevent the vibration of the bobbin 21a from being suppressed and to prevent the
deterioration of the sound quality.
[0065]
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23
Further, in the present embodiment, the signal line portion 67 and the bobbin main portion 65
are integrally formed by one flexible printed circuit. For this reason, compared with the case
where the signal line portion 67 and the bobbin main portion 65 are formed by separate
members, the process for connecting the signal line portion 67 and the bobbin main portion 65
becomes unnecessary, and the voice coil The manufacturability of the speaker 1 is improved. In
particular, since each of the signal line conductors 70 formed in the signal line portion 67 and
each of the bobbin conductors 75 formed in the bobbin main portion 65 are integrally patterned
by the same conductive member, It is possible to improve manufacturability while reliably
maintaining the conductive state of these conductors.
[0066]
Further, in the present embodiment, at the front end of the signal line portion 67, a signal line
connector 71 is provided. The signal line connector 71 is a connector connected to the circuit
board connector 72 (FIG. 2) provided on the audio signal processing circuit board 32, and the
signal line connector 71 and the circuit board connector 72 By being connected, an electrical
connection between the audio signal processing circuit board 32 and the signal line conductor
70 formed in the signal line portion 67 is realized, whereby the signal line conduction from the
audio signal processing circuit board 32 is realized. The output of the drive signal to the voice
coil 22 through the body 70 becomes possible. Due to such a configuration, when electrically
connecting each of the signal lines (the signal line conductors 70 formed in the signal line
portion 67) to the audio signal processing circuit board 32, the signal line portion 67 is used for
the signal line. It is sufficient to connect the connector 71 and the circuit board side connector
72, and the manufacturing ease of the voice coil speaker 1 is very high.
[0067]
Further, in the present embodiment, the audio signal processing circuit board 32 is mounted with
an amplifier circuit 64 for audio signal amplification. Here, although the amplifier circuit 64 is an
essential member for the voice coil speaker 1 according to the present embodiment, space can be
saved by mounting the amplifier circuit 64 on the audio signal processing circuit board 32 which
is also an essential member. Can be realized. Furthermore, in the present embodiment, each
circuit mounted on the audio signal processing circuit board 32 can be cooled, and by mounting
the amplifier circuit 64 on the audio signal processing circuit board 32, it has relatively heat.
Efficient cooling of the amplifier circuit 64 becomes possible.
11-04-2019
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[0068]
Further, in the voice coil speaker 1 according to the present embodiment, multi-channel audio
signals are input to the audio signal processing circuit board 32, and the audio signal processing
circuit board 32 executes signal processing corresponding to multi-channel audio signals. By
outputting a drive signal to each of the voice coils 22, voice is output. At this time, as described
above, it is possible to output voice in which deterioration of the sound quality is prevented.
[0069]
Second Embodiment Next, a second embodiment will be described.
In the following description, the same components as those of the first embodiment described
above are denoted by the same reference numerals, and the description thereof is omitted. FIG.
11 is a side view of the bobbin 21b according to the present embodiment, and (A) shows a state
before the bobbin base 93 (described later) and the signal line connection portion 94 (described
later) are connected, B) shows a state in which the bobbin base 93 and the signal line connection
portion 94 are connected. FIG. 12 is a view showing a state in which the bobbin base 93 is
developed. FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG.
[0070]
In the present embodiment, the bobbin 21a is formed by connecting the bobbin base 93 and the
signal line connection portion 94. As shown in FIG. 11, the bobbin base 93 is a cylindrical
member formed of a flexible printed circuit board, and as in the first embodiment, the bobbin
conductor 75 is pattern-formed. An input bobbin conductor 82 is formed with a winding start
connection contact 79, and the winding start connection contact 79 includes a winding prewinding wire extending from a winding start portion 85 of the front end edge 84 of the voice coil
22. A connection end 80 is formed on the output bobbin conductor 83 of the bobbin conductor
75 while the winding end connection contact 80 is formed on the rear end edge 86 of the voice
coil 22. An after-winding lead wire 91 extending from the end portion 87 of the winding is
connected.
[0071]
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25
The signal line connection portion 94 is formed of a flexible printed circuit board, and includes a
signal line relay portion 96 and a signal line portion 67 connected to the signal line relay portion
96 as shown in FIG. . As in the first embodiment described above, twelve signal line conductors
70 are formed in the signal line portion 67. The signal line relay portion 96 has a configuration
in which 12 conductive member extending portions 98 extending in the front-rear direction
extend at equal intervals from a base end portion 97 extending in a direction orthogonal to the
front-rear direction. Each of the member extension portions 98 is patterned with an extension
signal line conductor 99 as a conductive member formed of a thin film of metal such as copper.
Each of the extension signal line conductors 99 is integrally patterned by the same conductive
member as each of the signal line conductors 70 formed in the signal line portion 67. As shown
in FIG. 13, a tip conductor exposed portion 100 in which the extension signal line conductor 99
is exposed is formed at each tip of the conductive member extension portion 98.
[0072]
In the present embodiment, the bobbin base 93 and the signal line connection portion 94 are
connected to form the bobbin 21 b. In detail, as shown in FIG. 11, the trunk of the signal line
connection portion 94 in a rounded state is inserted into the internal cavity of the cylindrical
bobbin base 93, whereby the signal line connection with the bobbin base 93 is made. One
cylindrical bobbin 21 a is formed by the portion 94. When inserting the body of the signal line
connection portion 94, each of the extension signal line conductors 99 formed in the conductive
member extension portion 98 and each of the bobbin conductors 75 are disposed so as to
overlap with each other. Insertion takes place. Here, although illustration is omitted, in the inner
circumference of the bobbin base 93, at a position corresponding to the tip conductor exposed
portion 100 formed in each of the conductive member extension portions 98 of the inserted
signal line connection portion 94, A contact is formed by exposing the bobbin conductor 75, and
after the signal line connection portion 94 is inserted into the bobbin base 93, these contacts and
the tip conductor exposed portion 100 are soldered or the like. Electrically connected. By
connecting the contact formed on the inner periphery of the bobbin base 93 and the tip
conductor exposed portion 100 formed on the conductive member extending portion 98, a signal
corresponding to the audio signal processing circuit board 32 → input signal line Line conductor
70 → extended signal line conductor 99 → tip conductor exposed portion 100 → contact formed
on inner periphery of bobbin base 93 → input bobbin conductor 82 → contact for start of
winding connection 79 → lead wire before winding 90 → Voice coil 22 → winding lead wire 91
→ winding end connection contact 80 → output bobbin conductor 83 → contact formed on the
inner periphery of the bobbin base 93 → tip conductor exposed portion 100 → extension signal
line conductor 99 → output A subsequent electrical connection is established from the signal line
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conductor 70 corresponding to the signal line to the audio signal processing circuit board 32,
and the drive signal from the audio signal processing circuit board 32 to the voice coil 22 is
established. Output a configuration capable. Furthermore, after the signal line connection portion
94 is inserted into the bobbin base portion 93, the tape 101 made of a material having insulation
properties in the portion where the bobbin base portion 93 and the signal line connection
portion 94 overlap with each other (FIG. 11 (B ) Is wound and attached, whereby the signal line
connection portion 94 is fixed to the bobbin base 93. In the present embodiment, since the signal
line connecting portion 94 is fixed to the bobbin base 93 by using a tape, the work relating to the
fixing is very easy.
[0073]
As described above, in the present embodiment, the bobbin base 93 (bobbin 21a) and the signal
line connection portion 94 (signal line portion 67) are formed by different flexible printed
boards, and physical connection of these members, and Electrical connection between the signal
line (signal line conductor 70) and the bobbin conductor 75 (first conductor and second
conductor) is simultaneously performed. With such a configuration, the bobbin base 93 and the
signal line connection portion 94 can be manufactured in separate steps, and the degree of
freedom in design is enhanced, and the lead wire is wound around the bobbin base 93. After the
voice coil 22 is formed, the bobbin base 93 and the signal line connection portion 94 can be
connected, and the easiness of manufacturing and the freedom of manufacturing are enhanced.
Furthermore, the physical connection between the bobbin base 93 (bobbin 21a) and the signal
line connection portion 94 (signal line portion 67), and the signal line (signal line conductor 70)
and the bobbin conductor 75 (first conductor) And electrical connection with the second
conductor) is simultaneously performed. Therefore, when connecting the bobbin base 93 and the
signal line connection portion 94, the signal line (the signal line conductor 70) and the bobbin
are connected. Electrical connection with the conductor 75 (the first conductor and the second
conductor) can be made easily and reliably. In addition, since the material of the bobbin can be
freely determined, it is also possible to improve the quality of the speaker and the sound quality.
[0074]
Third Embodiment Next, a third embodiment will be described. FIG. 14 is a side view of the
bobbin 21c according to the present embodiment. FIG. 15 is a view showing a state in which the
bobbin 21c according to the present embodiment is developed. In the following description, the
same components as those of the first embodiment are denoted by the same reference numerals,
and the description thereof is omitted. As apparent from the comparison between FIG. 14 and
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27
FIG. 5 and the comparison between FIG. 15 and FIG. 6, in this embodiment, the length of the
input bobbin conductor 82 is different from that of the voice coil 22 in the first embodiment. ing.
Specifically, in the present embodiment, each of the input bobbin conductors 82 extends along
the bobbin main portion 65 to a position corresponding to the front end edge 84 of the voice coil
22. Here, since the input bobbin conductor 82 is a conductor to which the pre-rolling lead wire
90 extending from the winding start portion 85 of the front end edge 84 of the voice coil 22 is
connected, from the front end edge 84 of the voice coil 22 It just needs to be on the front side.
Based on this, in the present embodiment, each of the input bobbin conductors 82 is extended to
a position corresponding to the front end edge 84 of the voice coil 22 so that the input bobbin
conductor 82 and the winding front are wound. While ensuring the electrical connection with the
lead wire 90, the amount of the conductor is reduced and the reduction of the manufacturing
cost is realized.
[0075]
Fourth Embodiment Next, a fourth embodiment will be described. In the following description,
the same components as those in the second embodiment described above are denoted by the
same reference numerals, and the description thereof is omitted. FIG. 16 is a side view of the
bobbin 21d according to the present embodiment, and (A) shows a state before the bobbin base
93 (described later) and the signal line connection portion 94 (described later) are connected, B)
shows a state in which the bobbin base 93 and the signal line connection portion 94 are
connected. As is apparent from the comparison between FIG. 16 and FIG. 11, in the bobbin 21d
according to the present embodiment, the length of the input bobbin conductor 82 in the bobbin
base 93 is different from that of the second embodiment described above. Specifically, in the
present embodiment, as in the third embodiment described above, each of the input bobbin
conductors 82 is configured to extend to a position corresponding to the front end edge 84 of
the voice coil 22. With such a configuration, as in the third embodiment, a reduction in
manufacturing cost can be realized, and in the same manner as in the second embodiment, the
ease of manufacturing and the freedom of manufacturing can be improved.
[0076]
Fifth Embodiment Next, a fifth embodiment will be described. FIG. 17 is a view schematically
showing a bobbin 21e according to the present embodiment. FIG. 17 schematically shows the
bobbin 21 e in a state in which one voice coil 22 is formed for the convenience of description. In
the present embodiment, unlike the above-described embodiments, the bobbin 21e is not a
flexible printed circuit but a cylindrical member made of a material such as resin or paper. Then,
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inside the bobbin 21e, a plurality of conductive conductors 105 made of metal foil or the like and
having conductivity extend in the front-rear direction along the inner periphery of the bobbin
21e. The conducting conductor 105 is fixed to the bobbin 21e by means such as adhesion.
[0077]
The conducting conductor 105 is a member for achieving the same purpose as the bobbin
conductor 75 in the first embodiment described above. That is, the conductor for conduction 105
includes the conductor for input conduction 107 (second conductor) to which the pre-turn lead
wire 90 of the voice coil 22 is connected. A winding start connection contact 79 formed by
exposing the conductor 105 for conduction by cutting out the bobbin 21a is provided, and the
winding coil connection lead wire 90 is provided on the winding start connection contact 79. Is
connected. Similarly, the conducting conductor 105 includes the output conducting conductor
108 (first conductor) to which the lead wire 91 is connected after the voice coil 22 is wound. Is
provided with a winding end connecting contact 80 formed by exposing the conducting
conductor 105 by cutting out the bobbin 21a, and the voice coil 22 is wound on the winding end
connecting contact 80 after the lead wire 91 is connected. Furthermore, in the present
embodiment, the signal line portion 67 is not provided on the bobbin 21e, and the tinsel wire
106 is directly connected to the conducting conductor 105 by means such as soldering. The
tinsel wire 106 extends to the audio signal processing circuit board 32, and is connected to a
hole or a terminal of the audio signal processing circuit board 32. That is, in the present
embodiment, the audio signal processing circuit board 32 and the conductor for conduction 105
are connected by the tinsel wire 106, and a drive signal is output from the audio signal
processing circuit board 32 via the tinsel wire 106. .
[0078]
As described above, in the present embodiment, the bobbin 21 e is not a flexible printed circuit
board, and the tinsel wire 106 is directly connected to the conductive conductor 105, but such a
configuration is also possible. As in the first embodiment described above, each of the voice coils
22 is formed by double winding the lead wire using the conducting conductor 105, or after
winding into the magnetic gap 16f, the lead wire The connection between the lead wire 91 and
the audio signal processing circuit board 32 can be reliably established after winding without
extending 91, thereby preventing the deterioration of the sound quality due to the increase of the
magnetic gap 16f. And the fall of the manufacturability resulting from the complication of the
shape of a plate can be prevented.
[0079]
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Sixth Embodiment Next, a sixth embodiment will be described.
FIG. 18 is a view schematically showing a bobbin 21f according to the present embodiment. As
apparent from the comparison between FIG. 18 and FIG. 17, in the present embodiment, the
input conducting conductor 107 extends along the bobbin main portion 65 up to the position
corresponding to the front end edge 84 of the voice coil 22. The configuration is different from
the bobbin 21e according to the fifth embodiment in that the second embodiment is different.
With such a configuration, as in the third embodiment described above, electrical connection
between the input conducting conductor 107 and the pre-wound lead wire 90 can be ensured,
and You can reduce the amount and realize the reduction of the manufacturing cost.
[0080]
Seventh Embodiment Next, a seventh embodiment will be described. FIG. 19 is a side view of a
bobbin 21g according to the present embodiment. As apparent from the comparison between
FIG. 19 and FIG. 17, in the present embodiment, the conductor 107 for input conduction is not
provided among the conductors for conduction 105, and only the conductor 108 for output
conduction is provided. It is done. Then, the pre-wound lead wire 90 extending from the winding
start portion 85 of the front end edge 84 of the voice coil 22 is directly extended to the audio
signal processing circuit board 32 and connected to the audio signal processing circuit board 32.
There is. Even with such a configuration, an electrical connection between the voice coil 22 and
the audio signal processing circuit board 32 can be established, and each of the voice coils 22 is
connected to a lead wire as in the first embodiment described above. The connection between the
lead wire 91 after winding and the audio signal processing circuit board 32 is reliably
established without forming the double winding or extending the lead wire 91 after winding into
the magnetic gap 16f. As a result, it is possible to prevent the deterioration of the sound quality
due to the increase of the magnetic gap 16f, and to prevent the reduction of the
manufacturability due to the complicated shape of the plate.
[0081]
Eighth Embodiment Next, an eighth embodiment will be described. FIG. 20 is a view showing a
voice coil speaker 1h according to the present embodiment, in which (A) shows a front view, and
(B) shows a side view (partial sectional view). The voice coil speaker 1 h has the same function as
11-04-2019
30
the voice coil speaker 1 according to the first embodiment but has the same function and is
driven by the same principle. In FIG. 20, the voice coil speaker 1 h is appropriately selected
according to the function. Each component is denoted by the same reference numeral as the
component of the first embodiment. The configuration of the voice coil speaker 1h will be briefly
described. The voice coil speaker 1h includes a magnetic circuit portion 16 provided with a yoke
16c, a magnet 16d, a plate 16e and the like, a damper 20, and a bobbin 21 supported by the
damper 20. And a vibrating plate 24 connected to the bobbin 21. An audio signal processing
circuit board 32 is supported by two bridges 110 in front of the diaphragm 24. The audio signal
processing circuit board 32 is protected by a front shield cover 56 and a rear shield cover 59. .
The bobbin 21h according to the present embodiment and the voice coil 22 formed on the
bobbin 21h have substantially the same configuration as that of the above-described first
embodiment. That is, the bobbin main portion 65 and the signal line portion 67 are provided, and
the voice coil 22 is formed in the bobbin main portion 65. Here, in the first embodiment, the
signal line connector 71 is provided at the end of the signal line portion 67, but in the present
embodiment, the connector is not provided.
[0082]
As shown in FIG. 20, the audio signal processing circuit board 32 is provided in the
circumferential direction of the audio signal processing circuit board 32 in a state in which the
output terminal 111 protrudes outside the disk-like audio signal processing circuit board 32. ing.
The output terminal 111 extends to the outside of these shield covers via a gap between the
front shield cover 56 and the rear shield cover 59. In the present embodiment, the end of the
signal line portion 67 is directly connected to the output terminal 111 extended to the outside of
the shield cover. Here, since the output terminal 111 is exposed in front of the diaphragm 24, it
is very easy to access. Based on this, by configuring as described above, the signal can be reliably
transmitted by the simple operation of directly connecting the end of the signal line portion 67 to
the output terminal 111 extended to the outside of the shield cover. Electrical connection
between the signal line of the line portion 67 and the audio signal processing circuit board 32
can be established. Further, in the present embodiment, since the signal line portion 67 is
connected to the output terminal 111 extended to the outside of the shield cover, as in the first
embodiment, the signal line portion 67 is provided on the rear shield cover 59. There is no need
to provide the signal line through holes 73 for penetrating, and the protection of the audio signal
processing circuit board 32 can be improved, the cooling can be improved, and the
manufacturability of the shield cover can be improved.
[0083]
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31
As described above, in the present embodiment, the audio signal processing circuit board 32 is
disposed in front of the diaphragm 24, and the output terminal 111 is provided in the
circumferential direction of the audio signal processing circuit board 32. The unit 67 is
configured to be connected. Due to this configuration, it is possible to easily connect the audio
signal processing circuit board 32 and the signal line formed in the signal line portion 67.
[0084]
Ninth Embodiment Next, a ninth embodiment will be described. FIG. 21 is a view showing a voice
coil speaker 1i according to the present embodiment, in which (A) shows a front view, and (B)
shows a side view (partial sectional view). In the following description, the same components as
those of the eighth embodiment are denoted by the same reference numerals, and the description
thereof is omitted. As apparent from the comparison between FIG. 21 and FIG. 20, the present
embodiment is different from the eighth embodiment in that six output terminals 111 are
provided on the audio signal processing circuit board 32 at equal intervals. ing. Here, unlike the
bobbin 21a according to the first embodiment, the bobbin 21i according to the present
embodiment has a configuration in which six signal line portions 67 extend from the bobbin
main portion 65, and each of the signal line portions 67 , An input signal line connected to one
voice coil 22 and an output signal line are formed. Each of the six signal line portions 67 extends
from the bobbin main portion 65 at regular intervals. Then, each of the signal line portions 67 is
connected to each of the output terminals 111, whereby an electrical connection between the
audio signal processing circuit board 32 and the signal line is established.
[0085]
With the configuration as described above, it is possible to easily connect the audio signal
processing circuit board 32 and the signal line formed in the signal line portion 67 as in the
above-described eighth embodiment. Furthermore, as described above, since each of the six
signal line portions 67 is configured to extend from the bobbin main portion 65 at equal
intervals, the signal line portion 67 relative to the bobbin main portion 65 Therefore, the force is
applied uniformly, the force is applied unevenly to the bobbin 21a, and the vibration of the
bobbin 21a is not stabilized due to this, and the situation that the sound quality is deteriorated
can be prevented.
[0086]
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32
Tenth Embodiment Next, a tenth embodiment will be described. FIG. 22 is a view schematically
showing a configuration of a bobbin 21j according to the present embodiment. In FIG. 22, a circle
X is an enlarged view of the main part. As shown in FIG. 22, in the present embodiment, the force
applied to the bobbin main portion 65 along with the movement of the signal line portion 67 is
alleviated at the connection portion 120 between the bobbin main portion 65 and the signal line
portion 67. A relief portion 121 is formed. The relaxing portion 121 is formed by cutting out the
bobbin main portion 65 at both ends of the signal line portion 67. By configuring the relaxation
portion 121 in this manner, application of a biased force to the bobbin main portion 65 along
with the movement of the signal line portion 67 is mitigated, and the signal line portion 67 and
the bobbin main portion 65 The durability is improved, the moving range of the signal line
portion 67 in the vicinity of the connection portion 120 is expanded, and the flexibility of the
signal line portion 67 is improved.
[0087]
Eleventh Embodiment Next, an eleventh embodiment will be described. FIG. 23 is a diagram
showing a signal line unit 67 according to the present embodiment. In the first embodiment
described above, the signal line portion 67 is a member extending linearly. On the other hand, in
the present embodiment, as shown in FIGS. 23A and 23B, the signal line portion 67 has a
meandering shape. In the example of FIG. 23A, the signal line portion 67 has a shape in which a
V shape bent at approximately 90 degrees is connected. In the example of FIG. 23 (B), the signal
line portion 67 has a shape in which S-shapes are connected. By forming the signal line portion
67 in such a shape, it is possible to improve the durability while maintaining the flexibility and
flexibility of the signal line portion 67. In particular, since the signal line portion 67 is a flexible
printed circuit, it is easy to form the shape as described above, and the pattern of the signal line
conductor 70 can be formed according to the shape.
[0088]
The embodiment described above merely shows one aspect of the present invention, and any
modification and application can be made within the scope of the present invention. For example,
in the embodiment described above, the voice coil 22 of six layers is formed on the bobbin 21a,
but the number of layers of the voice coil 22 is not limited to this. That is, the present invention
is widely applicable to the voice coil speaker 1 in which the voice coil 22 of a plurality of layers is
formed on the bobbin 21a.
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[0089]
DESCRIPTION OF SYMBOLS 1, 1h, 1i voice coil speaker 21, 21a, 21b, 21c, 21d, 21e, 21f, 21g,
21h, 21i, 21j Bobbin 22 voice coil 32 audio signal processing circuit board (circuit board) 64
amplifier circuit 67 signal line part 70 signal line conductor (signal line) 79 winding start
connection contact (contact) 80 winding end connection contact (contact) 82 input bobbin
conductor (second conductor) 83 output bobbin conductor (first conductor) 84 Front end edge
86 Rear end edge 90 Pre-turn lead wire (lead wire) 91 Post-turn lead wire (lead wire) 107
Conductor for input conduction (second conductor) 108 Conductor for output conduction (first
conductor) 120 connection part 121 relaxation part
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