JP2003023695

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DESCRIPTION JP2003023695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker device used for an electrodynamic speaker device or a headphone, for
example, used for reproducing an acoustic signal in an audio frequency band, and more
particularly to a permanent magnet The present invention relates to a speaker device in which a
magnetic field is formed. In the following description, such a speaker device is referred to as a
dynamic speaker device.
[0002]
2. Description of the Related Art Conventionally, there has been proposed a dynamic speaker
apparatus whose main part is shown as a cross-sectional view in FIG.
[0003]
FIG. 8 shows the structure of the main part of a conventional dynamic speaker device as a crosssectional view cut longitudinally along an imaginary straight line passing through the center of
the center pole 4b.
The symbols N and S indicate the directions of the magnetic flux generated by the magnet 3, and
the same applies to the following description.
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[0004]
This dynamic speaker device has a disk-shaped yoke portion 4a having a predetermined
thickness, a cylindrical center pole portion 4b integrally formed with the yoke portion 4a at the
center position of the yoke portion 4a, and a center portion A magnetic yoke 4 having an
inverted T-shaped cross section in which a magnet guide portion 4c formed by a step portion
concentrically formed with the center pole portion 4b in a state of surrounding the pole portion
4b is integrated; A ring-shaped magnet 3 comprising a hollow cylindrical magnet 3 having a
hollow portion 20 joined to the yoke 4 in a state where the inner diameter is positioned by the
portion 4c, and a magnetically conductive plate joined to the upper surface of the magnet 3 The
plate 6 constitutes a magnet unit. Each of the magnetic yoke 4 and the plate 6 is formed of iron
material into a predetermined shape by forging.
[0005]
Next, the assembly of this dynamic speaker device will be described with reference to FIG.
[0006]
First, the magnet 3 is positioned by the magnet guide portion 4c, and is attached to the magnetic
yoke 4 in a state of being mounted at a predetermined position of the magnetic yoke 4.
A positioning jig (not shown) is used to join the plate 6 to the magnet 3 in a state where the plate
6 is disposed at a predetermined position with respect to the center pole portion 4b to complete
the magnet unit, and the magnetizing (not shown) As a result, the magnet 3 is magnetized into a
permanent magnet, and the positioning jig is removed. A bottom surface portion 7a having an
opening 7b of a frame 7 in which a metal plate such as a steel plate is integrally formed by a
press and in which a truncated cone is inverted is attached to the plate 6 by spot welding or the
like.
[0007]
A ring-shaped magnet 22 for magnetic shielding made of a permanent magnet is mounted on the
back side of the magnetic yoke 4. The ring magnet 22 is a magnetism preventing magnet
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provided to cancel the magnetic flux leaking from the magnet 3 to the outside of the dynamic
speaker device.
[0008]
A voice coil 8a is wound around a predetermined position of the voice coil bobbin 8 along the
outer periphery of the center pole portion 4b with respect to a gap portion 17 formed between
the center pole portion 4b and the plate 6. Using a positioning jig (not shown) in a state in which
a predetermined gap is formed between the inner periphery of the bobbin 8 and the center pole
portion 4 b and between the voice coil 8 a and the plate 6. The voice coil bobbin 8 and the voice
coil portion 8a are temporarily positioned.
[0009]
An opening provided on the inner peripheral side of the damper 9 is fitted to the voice coil
bobbin 8 projecting upward from the plate 6, while the outer peripheral side of the damper 9 is
the bottom surface 7a of the frame 7. The portion joined to the voice coil bobbin 8 of the damper
9 is joined to the bobbin 8 so as to be supported by the damper 9.
And this positioning jig is removed.
[0010]
The damper 9 is a so-called corrugation damper in which a plurality of ribs are sequentially
arranged in a concentric shape as shown in FIG. 8 and the cross section has a corrugated shape,
and the voice coil bobbin 8 is in the direction of the central axis of the bobbin. Is provided in
such a manner as to be supported in a state where it can freely vibrate and in an elastically
positioned state in a direction (forward direction) orthogonal to the direction of the central axis.
[0011]
A cone-shaped diaphragm portion 5, a free edge portion 13 continuously formed on the outer
peripheral portion of the diaphragm portion 5, and an edge continuously formed on the outside
of the free edge portion 13 The opening 5b of the diaphragm in which the outer peripheral
portion 2 is integrally formed and the opening 5b for fitting with the voice coil bobbin 8 is
formed in advance in the inner diameter portion 5a above the plate 6 of the voice coil bobbin 8.
The edge outer peripheral portion 2 is joined to the largest opening 21 of the frame 7 in a state
of being fitted to the outer peripheral side of the protruding portion, and this of the diaphragm
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portion 5 in a state of being fitted to the voice coil bobbin 8 The joining opening 5 b and the
voice coil bobbin 8 are joined, and the sheet pile 12 is joined on the edge outer peripheral
portion 2.
[0012]
The lead wire 8b drawn from the voice coil portion 8a through the space between the damper 9
and the voice coil bobbin 8 is extended in a state where it is adhered along the back side of the
diaphragm portion 5 and connected to the tinsel wire 16 Then, it is connected to the input
terminal 15 of the sound signal through the tinsel wire 16 to complete the assembly of the
dynamic speaker device.
The tinsel wire refers to a signal line which is formed by braiding a plurality of thin cotton yarns
and a plurality of thin copper wires and has an extremely flexible and hard-to-break
characteristic.
[0013]
However, in the case of the dynamic speaker device shown in FIG. 8, when the diaphragm portion
5 moves in the direction to be pulled by the voice coil bobbin 8, the fiber material of the
diaphragm portion 5 acts as a strength material. It moves in accordance with the movement of 8.
On the other hand, conversely, with respect to the movement in the direction in which the
diaphragm portion 5 is pushed by the coil bobbin 8, the diaphragm portion 5 is unevenly bent
and so-called runout vibration occurs in the diaphragm portion 5, and the voice coil bobbin
There is a problem that a twisting motion occurs in 8 and intermodulation distortion occurs in
the reproduced sound signal.
[0014]
Therefore, when the diaphragm section 5 is driven by the voice coil section 8a driven by the
acoustic drive signal supplied to the input terminal 15, the direction in which the diaphragm
section 5 is pulled by the voice coil bobbin 8 While the deformation of the diaphragm portion 5
in the case of moving is negligible, the deformation of the diaphragm portion 5 in the direction in
which the diaphragm portion 5 is pushed by the voice coil bobbin 8 is increased. Because of this,
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the diaphragm unit 5 moves asymmetrically between the case where the diaphragm unit 5 moves
in the direction of being pulled by the voice coil bobbin 8 and the case where the diaphragm unit
5 moves in the direction of being pushed by the voice coil bobbin 8 , Causing a twisting motion
of the voice coil bobbin 8 to generate intermodulation distortion in the reproduced audio signal,
and cause linginess in the reproduced audio signal. There was a problem.
[0015]
Next, in the dynamic speaker device, a situation where a garble appears in the reproduced
acoustic frequency characteristic when this intermodulation distortion is generated will be
described with reference to FIG.
[0016]
FIG. 9 is a diagram showing an example of the reproduction frequency characteristic of a socalled mid-range speaker device which is a conventional dynamic speaker device as shown in FIG.
8 and which is responsible for the midrange as a reproduction frequency band. The
measurement results of the frequency characteristics in the range corresponding to the midrange
are shown.
That is, as indicated by IM in FIG. 9 surrounded by an alternate long and short dash line, in this
example, in the portion of the reproduction frequency characteristic centered on about 2 KHz, a
distinctly large gap (deep Is clearly visible.
Therefore, it can be understood from this point that the conventional dynamic speaker device
also produces lumps in the reproduced sound signal.
[0017]
As a solution to this problem, as shown in FIG. 8, the diaphragm portion 5 is formed in a cone
shape, and the pinching angle α of the cone-shaped diaphragm portion 5 is made a narrow
angle. There has been proposed a method of reducing the deformation of the diaphragm portion
5 when moving in the direction of being pushed by the voice coil 8a. However, this method has a
problem that it is difficult to reduce the size of the dynamic speaker device.
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[0018]
There has also been proposed a method of increasing the sheet thickness of the diaphragm
portion 5 to reduce this deformation. However, in this method, there is a problem that the weight
of the diaphragm portion 5 is increased, and the reproduction efficiency of the acoustic signal in
the high frequency direction is reduced.
[0019]
A speaker device according to the present invention is a speaker device having voice coil bobbin
means provided with a first diaphragm means, a second diaphragm means and a voice coil. The
first and second diaphragm means and the voice coil bobbin means are arrayed and integrated in
a shape forming a triangle with the voice coil bobbin means as the base, and when the voice coil
bobbin means is driven by the voice coil, the voice coil bobbin According to the direction in
which the means is driven, any one of the first and second diaphragm means is driven in the
pulling direction.
[0020]
According to the present invention, when the voice coil bobbin means is driven in both directions
by the voice coil means, the diaphragm is driven in the direction to be pulled by the voice coil in
any driving direction. Can.
That is, since the diaphragms are arranged symmetrically with respect to the drive direction of
the voice coil, in any drive direction, even if deflection of the diaphragm occurs, it is symmetrical,
and by the voice coil means and the diaphragm means Since the cross section is triangular, high
strength can be obtained. Therefore, the twisting motion of the voice coil when the voice coil is
driven can be significantly reduced, and the quality of the reproduced acoustic signal can be
reduced.
[0021]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a speaker device
according to the present invention will be described with reference to FIGS.
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[0022]
An essential part of a first example of a dynamic speaker device according to the present
invention will be described with reference to FIG. 1 as a cross-sectional view taken along a virtual
straight line passing through the center of the center pole 4b.
[0023]
The dynamic speaker device 1 has a disk-like yoke portion 4a having a predetermined thickness,
and a cylindrical center pole portion 4b integrally planted with the yoke portion 4a at a central
position of the yoke portion 4a. A magnetic yoke 4 made of a magnetically conductive material
having an inverted T-shaped cross section in which a magnet guide 4c formed of a step portion
concentrically formed with the center pole 4b in a state of surrounding the center pole portion
4b is integrated; A hollow cylindrical magnet 3 joined to the yoke 4 in a state where the inner
diameter is positioned in the magnet guide portion 4c of the yoke 4, and a ring-shaped plate 6
made of a plate of magnetically conductive material joined to the upper surface of the magnet 3
And a magnet unit configured by
Reference numeral 20 denotes a hollow portion of the magnet 3.
[0024]
And 7 is a truncated cone integrally formed by pressing a metal plate made of steel plate or the
like attached to the plate portion 6 in a state that the bottom surface 7a is joined to the upper
surface of the plate portion 6. It is a frame with an inverted shape, and 7b is an opening formed
at the center of the bottom surface 7a.
[0025]
Also, this dynamic speaker device 1 comprises a diaphragm unit 10C comprising a peripheral
portion 2, a damper 9, a first diaphragm portion 10A and a second diaphragm portion 10B, a
voice coil 8a, a voice coil bobbin portion 11, It comprises the free edge portion 13, the cap 14
and the air gap 17.
Further, reference numeral 22 denotes a magnetism preventing magnet provided to make the
speaker device of the present invention into a magnetic defense type dynamic speaker.
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[0026]
The first diaphragm portion 10A includes a diaphragm A1 having a truncated cone shape with an
apex angle β, a free edge portion 13 provided on the side of the peripheral portion 10a of the
diaphragm portion 10A, and the like. It comprises the edge outer peripheral portion 2 provided
on the peripheral side of the free edge portion 13 and the inner diameter portion 5a formed on
the truncated side of the diaphragm 10A.
The second diaphragm portion 10B has a truncated cone-shaped diaphragm A2 having an apex
angle β and the aperture of the peripheral portion 10b has the same aperture as the aperture of
the peripheral portion 10a of the diaphragm 10A; It is configured to have an inner diameter
portion 10c formed on the truncated side of the diaphragm A2.
[0027]
In this diaphragm unit 10C, the inner surface 10d side of the first diaphragm portion 10A and
the inner surface 10e side of the second diaphragm portion 10B face each other as shown in FIG.
The peripheral portion 10a of the first diaphragm portion 10A and the peripheral portion 10b of
the second diaphragm portion 10B are joined. Further, as described later, the inner diameter
portion 5a of the first diaphragm portion 10A and the outer peripheral portion of the voice coil
bobbin 11 are joined, and the inner diameter portion 10c of the second diaphragm portion 10B
and the outer peripheral portion of the voice coil bobbin 11 are It is joined. With this structure, a
diaphragm unit 10c having a triangular cross section can be obtained.
[0028]
Next, an assembly example of a first example of a dynamic speaker device according to the
present invention will be described with reference to FIG. However, the same parts as the
assembly of the dynamic speaker device shown in FIG. 8 will be omitted.
[0029]
The voice coil bobbin 11 is inserted along the outer periphery of the center pole 4b into the gap
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17 formed between the center pole 4b and the plate 6, and the positioning jig (not shown) is
formed into a voice coil bobbin. 11 and a voice coil wound on the outer surface of the voice coil
bobbin 11 in a state in which predetermined air gaps 17 are formed on both the inner and outer
peripheral sides of the bobbin 11. 8a is in a state of being temporarily positioned.
[0030]
Next, the outer peripheral side of the damper 9 is joined to the bottom surface 7a of the frame 7,
and the opening provided on the inner peripheral side of the damper 9 is fitted and joined to the
outer peripheral side of the voice coil bobbin 11. The voice coil bobbin 11 is supported by the
damper 9.
[0031]
Next, the first inner diameter portion 5a of the diaphragm portion 10A is joined to the voice coil
bobbin 11 at a position close to the damper 9, and the second inner diameter portion 10c of the
second diaphragm portion 10B is The bobbin 11 is fitted to a portion near the upper end of the
voice coil bobbin 11 in FIG.
On the other hand, the largest peripheral peripheral part 2 formed by joining and integrating the
peripheral portion 10a of the first diaphragm portion 10A of the truncated cone shape and the
peripheral portion 10b of the second diaphragm portion 10B into a single body It is bonded and
fixed to the opening 21.
[0032]
A triangular shape formed by the cross section of the first diaphragm portion 10A, the cross
section of the second diaphragm portion 10B and the cross section of the voice coil bobbin 11 is
the junction point side of the peripheral portion 10a and the peripheral portion 10b. The position
of the inner diameter portion 10c relative to the bobbin 11 is corrected as necessary so that an
isosceles triangle is formed with the apex of the voice coil bobbin 11 and the bottom of the cross
section of the voice coil bobbin 11 as required. It is joined to this bobbin 11.
[0033]
The signal line 8b drawn from the voice coil 8a through the space between the damper 9 and the
voice coil bobbin 8 is extended in a state where it is adhered along the back side of the
diaphragm portion 5 and connected to the tinsel wire 16 Is connected to the input terminal 15 of
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the acoustic signal through the tinsel wire 16, the above-mentioned positioning jig (not shown) is
removed, and the cap 14 is attached to the upper end side of the voice coil bobbin 11. Assembly
is complete.
[0034]
Therefore, according to the example of FIG. 1, when the voice coil 8a is driven by the drive signal
supplied to the input terminal 15 and the voice coil bobbin 8 is moved upward in FIG. 1, the
second diaphragm portion 10B is When the voice coil bobbin 8 moves downward in FIG. 1, the
first diaphragm portion 10A is pulled and driven.
[0035]
Therefore, according to the example of FIG. 1, since the cross section of the triangular structure
is formed by the first diaphragm portion 10A, the second diaphragm portion 10B and the voice
coil 8a, the strength can be increased. The twisting motion of the voice coil bobbin 8 when the 8a
is driven by the input acoustic signal can be greatly reduced, and the reproduced acoustic signal
can be suppressed.
[0036]
Further, according to the present embodiment, when the voice coil 8a is driven by the drive
signal supplied to the input terminal 15 and the voice coil bobbin 8 is moved upward in FIG. 1,
the second diaphragm portion 10B is When the voice coil bobbin 8 is moved downward in FIG. 1,
the first diaphragm portion 10A is pulled, so that the pinching angle β is expanded and the first
vibrations are obtained. Even if the distance between the inner diameter portion 5a of the plate
portion 10A and the inner diameter portion 10c of the second diaphragm portion 10B is
narrowed, the degree of increase in intermodulation distortion is reduced as compared to the
dynamic speaker device of the conventional example. it can.
Therefore, according to the present embodiment, it is possible to make the dynamic speaker 1
thinner while suppressing an increase in intermodulation distortion.
[0037]
Further, according to this embodiment, since the cross section of the above-mentioned triangular
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structure is formed and high strength is obtained, the cone paper thickness can be made thin,
and the weight reduction of the cone paper as the diaphragm can be achieved. It is possible to
improve the sensitivity.
Further, according to the present embodiment, by making it possible to reduce the thickness in
this way, when the speaker system is configured as a multi-speaker system, for example, the
depth of the cone paper of the dynamic speaker sharing the high sound portion, middle noise It
becomes possible to substantially align the depth of cone paper and the depth of cone paper
sharing the low frequency part of the dynamic speaker sharing the part, and the phase difference
of the reproduced sound signal from the high tone part to the low tone part reproduced by each
speaker Delay time difference can be reduced, and sound quality can be improved.
[0038]
Next, the reproduced sound frequency characteristic of the example of the dynamic speaker
device according to the present invention shown in FIG. 1 will be described with reference to FIG.
[0039]
FIG. 7 is a diagram showing an example of the reproduction frequency characteristic of a socalled mid-range speaker apparatus which is an example of the dynamic speaker apparatus
according to the present invention as shown in FIG. This diagram shows the measurement results
of frequency characteristics in the range corresponding to the midrange.
As shown in FIG. 7, in this example, the part of the reproduction frequency characteristic
centered on about 2 KHz, as shown in the conventional example of FIG. It is understood that it
has not appeared.
Therefore, it can be understood from this point that the dynamic speaker device 1 shown in FIG.
1 does not generate lumps in the reproduced sound signal.
[0040]
Next, with respect to the structure of the main part of the second example of the speaker
apparatus according to the present invention, FIG. 2 is a sectional view taken along the imaginary
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straight line passing the center of the center pole 4b. The parts corresponding to FIG. 1 will be
described with the same reference numerals and the detailed description thereof will be omitted.
[0041]
In the example of the speaker device 24 shown in FIG. 2, the voice coil bobbin 30 is disposed
between the cone surface portion 10d of the first diaphragm portion 10A and the cone surface
portion 10e of the second diaphragm portion 10B. The bobbin portion 30a joined to the cone
surface portion 10d and the cone surface portion 10e and the outer surface 10G of the first
diaphragm portion 10A are partially protruded into the space portion 20 through the gap
portion 17 from the outer surface 10G In this example, the voice coil bobbin portion 30b
disposed in the state is used, and the bonding openings 5b and 10f are omitted.
Others are configured the same as in FIG.
[0042]
In the example of FIG. 2 also, the same function and effect as in the example of FIG. 1 can be
obtained, and further the cap portion 14 can be omitted by omitting the bonding openings 5b
and 10f, and the first diaphragm portion 10A. It can be easily understood that the effect that the
manufacturing process of the second diaphragm portion 10B can be shortened can be obtained.
In the assembling process, the first diaphragm portion 10A and the second diaphragm portion
10B may be respectively joined with the voice coil bobbin portion 30a interposed therebetween
to be assembled as a diaphragm unit.
Further, although it is desirable that the bores of the bobbins 30a and 30b match, there may be a
slight difference, or the material may be different. For example, the material of the bobbin
portion 30b may be determined by the bonding property with the heat resistant voice coil 8a or
the like.
[0043]
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Next, the structure of the main part of the third example of the speaker apparatus according to
the present invention will be described with reference to FIG. 3 which is a cross-sectional view of
the embodiment taken along a virtual straight line passing through the center of the center pole
4b. The parts corresponding to FIG. 1 and FIG. 2 will be assigned the same reference numerals
and detailed explanations thereof will be omitted. The speaker device example 25 shown in FIG.
3 is an example in which the bobbin 30a in the example shown in FIG. 2 is configured by a
frusto-conical bobbin 31a. Others are configured the same as in FIG. 1 and FIG.
[0044]
It can be easily understood that the same function and effect as those in FIGS. 1 and 2 can be
obtained also in this example in FIG.
[0045]
Next, with respect to the structure of the main part of the fourth example of the speaker
apparatus according to the present invention, FIG. 4 is a sectional view taken along a virtual
straight line passing the center of the center pole 4b. The parts corresponding to FIG. 1 and FIG.
2 will be assigned the same reference numerals and detailed explanations thereof will be omitted.
[0046]
The speaker device example 26 shown in FIG. 4 is a curved cone portion in which the sectional
shape of the cone surface portion 10d of the first diaphragm portion 10A in the example shown
in FIG. As shown in FIG. 4, the peripheral portions of a curved cone 32b having a cross-sectional
shape of the cone surface portion 10e of the second diaphragm portion 10B and an elliptical
curved surface shape projecting outward are joined as shown in FIG. In this example, the
diaphragm unit 32 is configured in a triangular shape that approximates an isosceles triangle
whose apex angle is the cross section of the curved cone portion 32 a and the cross section of
the curved cone portion 32 a as the base.
Others are configured the same as in FIG. 1 and FIG.
[0047]
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Also in this example of FIG. 4, the same function and effect as in the examples of FIGS. 1 and 2
can be obtained, and by further forming the diaphragm unit 32 with curved cones 32a and 32b,
the strength of the diaphragm unit 32 is increased. It can be easily understood that the action
and effect can be obtained.
In the example of FIG. 4, the cross-sectional shape of the cone surface portion of the diaphragm
portion is a curved surface shape that protrudes outward, but it is needless to say that a curved
surface shape that is recessed inward may be used conversely. Further, as shown in FIG. 1, the
bobbins 30 a and 30 b may be integrated and joined in a state of penetrating the diaphragm unit.
[0048]
Next, the structure of the main part of the fifth example of the speaker apparatus according to
the present invention will be described with reference to FIG. 5 which is a cross-sectional view of
the embodiment taken along a virtual straight line passing through the center of the center pole
4b. The parts corresponding to FIG. 1 will be described with the same reference numerals and
the detailed description thereof will be omitted.
[0049]
The speaker device example 27 shown in FIG. 5 includes a diaphragm portion 36a, a damper
portion 36b continuously formed on the outer peripheral portion side of the diaphragm portion
36a, and a damper portion 36b continuously formed on the outer peripheral portion side of the
damper portion 36b. A first diaphragm unit 36 configured of an edge outer peripheral portion
36c formed in a manner and a bonding opening 36d formed continuously on the inner
peripheral side of the diaphragm portion 36a; a diaphragm portion 37a; A free edge portion 37b
continuously formed on the outer peripheral portion side of the diaphragm portion 37a, an edge
outer peripheral portion 37c continuously formed on the outer peripheral portion side of the free
edge portion 37b, and an inner peripheral side of the diaphragm portion 37a And a second
diaphragm unit 37 constituted by a joining opening 37d formed continuously, a bobbin portion
35, and a frame 39.
[0050]
The frame 39 is formed of an injection-molded resin frame, and the resin frame 39 includes a
magnet insertion portion 39a, a receiving portion 39b to which the edge outer peripheral portion
36c is joined, and the receiving portion 39b. , And another receiving portion 39c disposed on the
upper side with respect to the receiving portion 39b and to which the edge outer peripheral
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portion 37c is joined, and is configured in a cylindrical shape with the upper end side and the
lower end side opened. There is.
[0051]
Next, the assembly of the dynamic speaker device 27 will be described.
[0052]
By fitting and joining the fitting portion 39a of the frame 39 to the magnet 3, the frame 39 is
positioned with respect to the magnet 3 in the state shown in FIG.
Next, the diaphragm portion of the voice coil bobbin 35 in a state where the voice coil portion 8a
is temporarily positioned at a predetermined position with respect to the gap portion 17 formed
between the opening portion 19 of the plate 5 and the center pole portion 4b. The position
where one end face of the bobbin portion 38 is along the inner peripheral side of the damper
portion 36b in a state where the bonding opening 36d of 36a is fitted and the edge outer
peripheral portion 36c is joined to the receiving portion 39b on the frame 39 side Mounted and
joined.
[0053]
Then, the edge outer peripheral portion 37c of the diaphragm portion 37a is joined to the other
receiving portion 39c, and the joining opening 37d contacts the joining opening 36d fitted to the
voice coil bobbin 35. In the state in which the voice coil bobbin 35 is engaged, the diaphragm
portion 37 a is joined to the other end face of the bobbin portion 38 in a state where the joining
opening 37 d is fitted to the voice coil bobbin 35.
[0054]
A triangle formed with the cross sections of the diaphragm portion 37a and the diaphragm
portion 36a as equal sides and the height of the cross section of the bobbin portion 38 as a base
corresponds to the contact points of the joint openings 36d and 37d. The fitting position of the
bonding openings 36d and 37d with respect to the voice coil bobbin 35 is adjusted to a position
where the isosceles triangle with the angle at the apex is formed, and the bonding opening 36d is
formed at this adjusted position. In a state where the bonding opening 37d is in contact with the
bonding opening 36d in a state of being bonded and fixed to the bobbin portion 38 and thus
bonded and fixed to the bobbin portion 38, the bonding opening 37d is a voice coil bobbin 35
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And the voice coil portion 8a is positioned at a predetermined position with respect to the space
portion 17 formed between the center pole portions 4b. , The assembly of the dynamic speaker
device 27 is completed.
[0055]
In the example shown in FIG. 5, the same function and effect as those in the example shown in
FIG. 1 can be obtained, and by disposing the damper portion 36b at the position shown in FIG. It
can be easily understood that the action and effect can be obtained.
[0056]
Next, with respect to the structure of the main part of the sixth example of the speaker apparatus
according to the present invention, FIG. 6 is a sectional view taken along a virtual straight line
passing through the center of the center pole 45c. The parts corresponding to FIG. 1 will be
described with the same reference numerals and the detailed description thereof will be omitted.
[0057]
The dynamic speaker device 40 shown in FIG. 6 has a truncated conical first diaphragm 41, a
truncated conical second diaphragm 42, a ring shaped first damper 43, and a ring shaped A
second damper 44, a magnet unit 45, a hollow cylindrical voice coil bobbin 46, a voice coil 47
and a chassis 48 are formed.
The magnet unit 45 includes a first hollow ring magnet 45a, a second hollow ring magnet 45b, a
hollow ring center pole 45c, and a magnet unit case 45d formed of resin. It is a repulsive
magnetic circuit type magnet unit.
Reference numeral 49 denotes a gap provided along the hollow ring-shaped center pole 45 c
between the center pole 45 c and the voice coil 47.
[0058]
Next, the assembly of the dynamic speaker device 40 will be described.
[0059]
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The voice coil bobbin 46 is temporarily positioned with the air gap 49 of a predetermined size
formed between the center pole 45c and the voice coil 47, and the bonding opening 43a of the
first damper 43 is used. A bonding outer peripheral portion 43b of the first damper 43 opposite
to the bonding opening 43a of the first damper 43 and bonded to the outer surface of the upper
end 46a of the voice coil bobbin 46 is bonded to the upper surface of the magnet unit case 45d.
[0060]
The bonding opening 44a of the second damper 44 is bonded to the outer surface of the lower
end 46b of the voice coil bobbin 46, and the bonding outer periphery 44b of the second damper
44 is bonded to the lower surface of the magnet unit case 45d. Thus, the voice coil bobbin 46 is
positioned with respect to the magnet unit 45 in a state where the gap 49 of a predetermined
size is formed between the center pole 45c and the voice coil 47.
[0061]
Next, the cutting portion 41a of the first diaphragm 41 and the cutting portion 42a of the second
diaphragm 42 are integrally joined, and the bonding outer peripheral portion 41b of the first
diaphragm 41 is a voice coil bobbin 46. The outer periphery 42 b of the second diaphragm 42 is
fitted on the inner surface of the lower end 46 b of the voice coil bobbin 46.
[0062]
A triangular shape formed by the cross section of the first diaphragm 41, the cross section of the
second diaphragm 42, and the cross section of the voice coil 47 is formed by joining the cutting
head 41a and the cutting head 42a. The angle between the cross section of the first diaphragm
41 and the cross section of the second diaphragm 42 is the apex angle, and an isosceles triangle
is formed with the cross section of the voice coil bobbin 46 as the base. In a state where the
fitting position of the bonding outer peripheral portion 41b and the bonding outer peripheral
portion 42b to the voice coil bobbin 46 is corrected, it is bonded to the voice coil bobbin 46,
integrated with the voice coil bobbin 46, and the assembly of the dynamic speaker device 40 is
completed. Do.
[0063]
The chassis 48 is a supporting portion of the dynamic speaker device 40, which is manufactured
by resin molding and in which the vent holes 48a are provided in a state where the chassis 48 is
penetrated in its main part It is provided in the state integrated with magnet unit case 45d.
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However, the chassis 48 is not an essential component of the dynamic speaker device 40.
In addition, the size (area) of the cutting portion 41a of the first diaphragm 41 and the cutting
portion 42a of the second diaphragm 42 is sufficiently small if they are integrated with a
sufficient bonding force in a bonded state It is good.
[0064]
Also in this example of FIG. 6, the same function and effect as in the example of FIG. 1 can be
obtained, and further, the magnet unit 45 is disposed at the position shown in FIG. It will be
easily understood that the operation and effect that the device can be further thinned can be
obtained.
[0065]
In the speaker device according to the present invention, the strength is increased by configuring
the diaphragm portion to have a triangular cross section, and the torsional vibration of the voice
coil driving this diaphragm is suppressed. It is possible to reduce the distortion of the sound
signal to be reproduced and reproduced, to make it possible to make the whole portion of the
diaphragm thinner, to make the speaker device thinner, and to make the thickness of the
diaphragm itself thinner. It is possible to improve the sensitivity of the diaphragm.
[0066]
Brief description of the drawings
[0067]
1 is a cross-sectional view showing a first example of the speaker device according to the present
invention.
[0068]
2 is a cross-sectional view showing another example of this speaker device.
[0069]
3 is a cross-sectional view showing still another example of the speaker device.
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[0070]
4 is a cross-sectional view showing still another example of the speaker device. .
[0071]
5 is a cross-sectional view showing still another example of the speaker device.
[0072]
6 is a cross-sectional view showing still another example of the speaker device.
[0073]
7 is a diagram showing an example of the frequency characteristics of the speaker device
according to the present invention.
[0074]
8 is a cross-sectional view showing an example of a conventional speaker device.
[0075]
9 is a diagram showing an example of the frequency characteristics of the conventional speaker
device.
[0076]
Explanation of sign
[0077]
DESCRIPTION OF SYMBOLS 1 ............ Dynamic speaker apparatus, 3 ... Magnet, 4 ......... Magnetic
yoke 6, 6 ...... Plate, 8a ......... Voice coil part, diaphragm part 10A, 10B, 11 ......... Voice coil bobbin
11
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