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JP2005323071

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2005323071
PROBLEM TO BE SOLVED: To provide a speaker device which is easy to attach to a structure or
the like and which can obtain a sufficient acoustic effect. SOLUTION: A cylindrical casing 11, an
outer yoke 12 concentrically supported in the casing, a voice coil 13 attached to an inner
peripheral surface of the outer yoke member, and a voice disposed in the outer yoke The plate
14 is opposed to the coil, the damper 16 vibratably supports the plate 14, the magnets 19A and
19B attached to the plate 14, the inner yokes 20A and 20B attached to the magnet, and the plate
14 The diaphragm 17 is provided with an edge 18 that vibratably supports the diaphragm.
[Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to the configuration of a speaker device.
[0002]
FIG. 1 shows an example of use of a conventional speaker device.
[0003]
In the example of use of FIG. 1, for example, a pipe that constitutes a frame of a seat of a
passenger car or the like is used as a sound wave passage of the speaker device, thereby
maintaining the strength of the seat and increasing its outer shape and weight. The speaker
device is attached to the inside of the seat, and the other end 2B of the pair of hollow frames 2
disposed on both sides inside the backrest 1A of the seat 1 and having one end 2A open The
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speaker devices 3 are respectively attached.
[0004]
Then, the frame 2 is used as a resonance part or a volume part of the sound output from the
speaker device 3, and the sound output from the speaker device 3 passes through the inside of
the frame 2 from the open end 2A to a room such as a passenger car. The sound is emitted (see,
for example, Patent Document 1).
[0005]
A speaker device that can be attached to such a seat using the frame pipe has not yet been
developed specifically, and it is sufficient when attached using a conventional speaker device.
There are problems such as the inability to obtain an acoustic effect.
[0006]
Unexamined-Japanese-Patent No. 2003-235088
[0007]
SUMMARY OF THE INVENTION One of the problems to be solved by the present invention is to
solve the problems in a speaker device attached to a structure as described above using a frame
pipe or the like.
[0008]
A speaker device according to the present invention (the invention according to claim 1) has a
cylindrical casing, and a cylindrical casing disposed inside the casing and supported
concentrically with respect to the casing in order to achieve the above object. The outer yoke
member, the voice coil member attached to the inner circumferential surface of the outer yoke
member, and the outer yoke member are concentrically disposed inside the outer yoke member,
and the outer circumferential surface opposes the voice coil member with a required interval. A
plate member, a damper member interposed between the plate member and the casing to
support the plate member in a direction parallel to the center line of the outer yoke member so
as to vibrate in a direction parallel to the center line of the outer yoke member; And an inner
yoke member attached to the magnet member and opposed to the inner peripheral portion of the
outer yoke member with a required distance, and the plate member connected to the inner yoke
member. A vibration plate member is characterized by comprising an edge member for
supporting freely vibrating the vibrating plate member is interposed between the outer
peripheral portion and the casing of the vibration plate member with respect to the casing.
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[0009]
According to the present invention, the cylindrical outer yoke that constitutes the drive portion of
the speaker is concentrically supported within the cylindrically shaped casing, and the voice coil
is attached to the central portion of the inner circumferential surface of the outer yoke. A plate
whose outer peripheral surface is opposed to the voice coil is concentrically disposed inside the
outer yoke, and can be vibrated in a direction parallel to the center line of the outer yoke by a
damper interposed between the plate and the casing. A magnet is attached to the plate and
magnetized, and an inner yoke is attached to the magnet, and the inner yoke is opposed to the
inner circumferential surface of the outer yoke at a predetermined interval. The speaker device is
composed of a magnetic circuit, and a diaphragm connected to the plate, whose diaphragm is
vibratably supported by the casing via the edge. It is the form.
[0010]
In the speaker device according to this embodiment, the voice coil is positioned in the magnetic
field formed between the plate magnetized by the magnet and the outer yoke, and an electric
current is generated in the voice coil to generate an electromagnetic force. The plate is vibrated
in a direction parallel to the center line of the outer yoke with respect to the outer yoke
concentrically supported in the casing fixed to the resonator or the like by the electromagnetic
force, and is further connected to the plate The vibrating diaphragm is vibrated to generate
sound.
[0011]
According to the speaker device according to this embodiment, the outer diameter of the casing
supporting the outer yoke is set to be equal to or smaller than the outer diameter of the
resonator or the like to which the speaker device is attached. Even in the case of installation,
there is no need to particularly secure the installation space, so that the installation becomes
easy and a sufficient acoustic effect can be obtained.
[0012]
Furthermore, the speaker device according to this embodiment can lower the lowest resonance
frequency by providing a moving magnet type configuration, which enables the reproduction of
ultra-low tones.
[0013]
FIG. 2 is a side sectional view showing a first example of the embodiment of the loudspeaker
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apparatus according to the present invention, and FIG. 3 is a sectional view taken along the line
III-III in FIG.
[0014]
In FIGS. 2 and 3, the speaker device 10 is housed in a cylindrical casing 11 having an outer
diameter substantially equal to or smaller than the outer diameter of a pipe (not shown) to which
the speaker device 10 is attached. An outer yoke 12 formed of a cylindrical magnetic body
having an outer diameter smaller than 11 is concentrically supported by connection bars 11A
interposed between both ends of the outer yoke 12 and the casing 11, respectively.
[0015]
A ring-shaped recessed groove 12A is formed in a central portion on the inner peripheral surface
side of the outer yoke 12, and the spiral voice coil 13 is fixed in a state fitted in the recessed
groove 12A. There is.
[0016]
A disc-like plate 14 having an outer diameter smaller than the inner diameter of the outer yoke
12 is disposed at a position facing the voice coil 13 in the outer yoke 12, and fixed to the plate
14 so as to penetrate the central portion thereof. The center shaft 15 is mounted.
[0017]
A damper 16 is interposed between one end (left end in FIG. 2) of the center shaft 15 and the
casing 11, and a plate-like member is formed on the other end (right end in FIG. 2). The
diaphragm 17 is fixed by connecting its central portion.
[0018]
An edge 18 is interposed between the outer peripheral portion of the diaphragm 17 and the
casing 11, and the diaphragm 17 and the center shaft 15 are made to the casing 11 and the
outer yoke 12 by the edge 18 and the damper 16. It is concentrically and axially and vibratably
supported.
[0019]
The outer diameter of the plate 14 is set to a size such that a required magnetic gap is formed
between the outer peripheral surface of the plate 14 and the inner peripheral portion of the voice
coil 13.
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[0020]
A pair of ring-shaped magnets (in this example, neodymium magnets) 19A and 19B having outer
diameters smaller than the outer diameter of the plate 14 on the both sides of the plate 14
respectively In order to magnetize the plate 14, the same pole (in this example, the N pole) is
concentrically fixed so as to abut.
[0021]
Further, inner yokes 20A and 20B having the following shapes are fixed to the outer side
surfaces of the magnets 19A and 19B, respectively.
[0022]
That is, the inner yokes 20A and 20B have respective inner end sides of the main body portions
20Aa and 20Ba each formed in a substantially cylindrical shape having a diameter of the outer
peripheral surface smaller by a predetermined dimension than the inner diameter of the voice
coil 13 (magnets 19A and 19B The inner flange portions 20Ab and 20Bb are integrally formed
on the side facing each other.
[0023]
Then, by fixing the inner flange portions 20Ab and 20Bb concentrically to the outer surfaces of
the magnets 19A and 19B by bonding or the like, the inner yokes 20A and 20B respectively have
the outer peripheral surface and the voice of the main portions 20Aa and 20Ba. It is
concentrically positioned in the outer yoke 12 with a gap of the same size being opened all
around between the coil 13 and the inner circumferential portion of the coil 13.
[0024]
At this time, in the inner yokes 20A and 20B, a substantially half portion of the inner end side
(the side fixed to the magnets 19A and 19B) of the outer peripheral surface of the main body
portions 20Aa and 20Ba is opposed to the voice coil 13, and the outer end side An approximately
half portion of the is opposed to the outer yoke 12.
[0025]
The inner yokes 20A and 20B guide the magnetic flux from the magnets 19A and 19B toward
the outer yoke 12 toward the inner direction from the outer yoke 12 in the direction of returning
to the magnets 19A and 19B as described later. By functioning as well as increasing the air
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resistance in the gap with the outer yoke 12, it functions to restrict the flow of air between the
spaces on both sides separated by the plate 14.
[0026]
FIG. 4 is an operation explanatory view showing the flow of magnetic lines of force in the speaker
device 10.
[0027]
Next, the operation of the speaker device 10 will be described based on FIG.
[0028]
In FIG. 4, the lines of magnetic force of the magnetic field formed by the magnets 19A and 19B
are directed from the plate 14 magnetized in the N pole toward the opposing outer yoke 12 and
are divided into left and right inside the outer yoke 12 and passed The outer yoke 12 is directed
to the inner yokes 20A and 20B facing the inner circumferential surface of the outer yoke 12,
respectively, and returns to the magnets 19A and 19B through the inner yokes 20A and 20B.
[0029]
In this state, for example, when current flows to the front side (from the back side to the front
side in the drawing) to the upper part (the part shown in FIG. 4) of the voice coil 13, An
electromagnetic force is generated in the left direction in FIG. 4 with respect to the plate 14 by
the magnetic field in the direction of the magnetic line of force A, and the plate 14 is biased in
the right direction x1 by the voice coil 13 being fixed.
[0030]
At this time, at the same time, a magnetic field in the direction of magnetic field lines B directed
from the outer yoke 12 to the inner yokes 20A and 20B through the portion where the voice coil
13 is attached generates an electromagnetic force in the right direction in FIG. The inner yokes
20A and 20B are biased in the left direction x2.
[0031]
However, the magnetic lines of force of the magnetic field from the outer yoke 12 toward the
inner yokes 20A and 20B pass through the portion where the voice coil 13 is not attached from
the outer yoke 12 as shown by the magnetic lines of force C in addition to the portions shown by
the magnetic lines of force B. Since there is a portion that does not generate an electromagnetic
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force by moving toward the inner yokes 20A and 20B, the biasing force in the right direction x1
with respect to the plate 14 by the magnetic field of the magnetic field line A It becomes larger
than the biasing force in the left direction x2 with respect to.
[0032]
Thus, the plate 14 is moved by the magnetic field in the direction of the magnetic field line A in
the right direction x1 of FIG. 4 by a width proportional to the magnitude of the current flowing
through the voice coil 13.
[0033]
Similarly, when current flows in the voice coil 13 in the opposite direction to the above, the plate
14 is moved in the left direction x2, and as a result, the diaphragm 17 is vibrated via the center
shaft 15.
[0034]
As shown in FIG. 2, the speaker device 10 has, for example, the outer diameter of the casing 11
set to a size equal to or smaller than the outer diameter of the pipe to which the speaker device
10 is attached. Even if it is attached to the pipe which constitutes the frame of the structure as in
the example and this frame pipe is used as the acoustic resonator or the acoustic volume of the
speaker device 10, the mounting space of the speaker device 10 in the structure There is no need
to secure in particular, which makes it easy to attach and to obtain a sufficient acoustic effect.
[0035]
And the said speaker apparatus 10 can make the lowest resonant frequency low by having the
structure of a moving magnet system, and, thereby, reproduction | regeneration of an ultra-low
sound is attained.
[0036]
In the above, an example in which a ring-shaped magnet is used for the magnets 19A and 19B of
the speaker device 10 is shown, but instead of the ring-shaped magnets 19A and 19B, a plurality
of magnets are used. The block-shaped magnets may be circumferentially arranged and attached
to the side surface of the outer edge portion of the plate 14.
[0037]
In addition, the outer yoke 12 and the plate 14, and the inner yokes 20A and 20B form a slit for
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electrically interrupting each arbitrary position to reduce generation of eddy current, or each It
may be made up of a plurality of pieces.
[0038]
In addition, a fin structure may be provided on the outer peripheral surface of the casing 11, and
the heat generated from the voice coil 12 by conduction is transmitted to the casing 11 via the
connection bar 11A and dissipated from the outer peripheral surface of the casing 11. By doing
this, it is possible to achieve the efficiency of the electrical input by promoting the heat radiation.
[0039]
The damper 16 may be of any material or shape as long as it has air permeability.
[0040]
5 to 13 are cross-sectional views showing an example of use of the speaker device 10,
respectively.
[0041]
FIG. 5 shows a first use example in which a pipe P1 having the same diameter as the casing 11 is
connected as an acoustic resonance unit on one end side of the casing 11 of the speaker device
10.
[0042]
FIG. 6 shows a second use example in which a horn P2 whose proximal end has the same
diameter as the casing 11 and whose distal end is spread like a trumpet is connected to one end
of the casing 11 of the speaker device 10.
[0043]
FIG. 7 shows a third application example in which pipes P3 and P4 having the same diameter as
the casing 11 but having different lengths but different resonances are connected to both ends of
the casing 11 of the speaker device 10, respectively. It is done.
[0044]
In FIG. 8, an acoustic volume portion P5A whose base end side is larger than the outer diameter
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of the casing 11 on one end side of the casing 11 of the speaker device 10 and whose tip portion
has the same diameter as the casing 11 is an acoustic resonance portion P5B. A fourth use
example is shown in which a pipe (Helmholtz resonator) P5 constituting the is connected.
[0045]
9, as in the example of FIG. 7, pipes P6 and P7 having the same diameter as the casing 11 but
having different lengths and different resonances are provided at both ends of the casing 11 of
the speaker device 10, respectively. Although connected, in the example of FIG. 7, while the tip
openings of the pipes P3 and P4 are directed opposite to each other by 180 °, the pipes P6 and
P7 are curved and the respective tip openings P6a, A fifth use case is shown where P7a is
oriented in the same direction.
[0046]
In FIG. 10, at both ends of the casing 11 of the speaker device 10, acoustic volume portions P8A
and P9A larger than the outer diameter of the casing 11 and the acoustic volume portions P8A
and P9A are provided and opened in the same direction. There is shown a sixth application
example in which band pass regenerators P8 and P9, each of which is constituted by pipe-shaped
acoustic resonators P8B and P9B having different lengths, are connected.
[0047]
In FIG. 11, as in the case of the example of FIG. 8, an acoustic volume portion P10A whose base
end side is larger than the outer diameter of the casing 11 is formed on one end side of the
casing 11 of the speaker device 10 Although the Helmholtz resonator P10 constituting the
resonance portion P10B is connected, in the example of FIG. 8, the tip opening of the Helmholtz
resonator P5 is located on the opposite side to the mounting position of the speaker device 10, A
seventh usage example is shown in which the acoustic resonance portion P10B of the resonator
P10 is bent 180 ° and the tip opening P10a is located on the same side as the speaker device
10.
[0048]
In FIG. 12, a pipe P11 having the same diameter as that of the casing 11 is connected as an
acoustic resonance unit to one end of the casing 11 of the speaker device 10 as in the example of
FIG. The distal end opening of the pipe P1 is located on the opposite side to the mounting
position of the speaker device 10, while the pipe P11 is bent 180 ° and the distal end opening
P11a is located on the same side as the speaker device 10 An example use of 8 is shown.
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[0049]
In FIG. 13, as in the example of FIG. 6, a horn P12 whose proximal end has the same diameter as
the casing 11 and whose distal end is spread like a trumpet is connected to one end of the casing
11 of the speaker device 10. In the example of FIG. 6, while the tip opening of the horn P2 is
located on the opposite side to the mounting position of the speaker device 10, the horn P12 is
bent 180 ° and the tip opening P12a is on the same side as the speaker 10 A ninth use case is
shown located at.
[0050]
FIG. 14 is a side sectional view showing a second example of the embodiment of the speaker
device according to the present invention.
[0051]
In the speaker device 30 of FIG. 14, the outer end portions 30Ac, 30Bc of the main body portions
30Aa, 30Ba of the inner yokes 30A, 30B are curved in the direction approaching the outer yoke
12 side, and the outer end portions 30Ac. , 30Bc and the inner circumferential surface of the
outer yoke 12 are smaller than the gaps between the main body portions 30Aa, 30Ba and the
inner circumferential surface of the outer yoke 12.
[0052]
Furthermore, in this embodiment, a cone-shaped diaphragm 37 is attached instead of the plateshaped diaphragm 17 of the first embodiment.
[0053]
The configuration of the other parts is substantially the same as the configuration of the speaker
device 10 of the first embodiment of FIG. 2, and the same components as those of the speaker
device 10 of FIG.
[0054]
As described in the first embodiment, the inner yokes 30A and 30B direct the magnetic flux from
the magnets 19A and 19B toward the outer yoke 12 from the outer yoke 12 to the inside of the
magnets 19A and 19B. While having the function of guiding in the returning direction, it also has
the function of restricting the flow of air between the two spaces separated by the plate 14 by
increasing the air resistance in the gap with the outer yoke 12 As described above, when the
outer end portions 30Ac, 30Bc of the inner yokes 30A, 30B facing the outer yoke 12 are closer
to the outer yoke 12 than the main body portions 30Aa, 30Ba, the outer yokes 12 The function
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of guiding the magnetic flux back to the magnets 19A and 19B and the flow of air between the
space on both sides of the plate 14 are restricted. That function is enhanced, thereby, it becomes
possible to further improve the sound generation efficiency of the speaker device 30.
[0055]
In the above, although the outer end portions 30Ac, 30Bc of the main body portions 30Aa, 30Ba
of the inner yokes 30A, 30B are curved toward the outer yoke 12 side, the gap with the outer
yoke 12 is reduced. Other ring-shaped parts may be attached to the outer peripheral surface of
the outer end portion of the main body portions 30Aa and 30Ba to reduce the gap with the outer
yoke 12.
[0056]
FIG. 15 is a side sectional view showing a third example of the embodiment of the speaker device
according to the present invention.
[0057]
In FIG. 15, the speaker device 40 has a pair of the magnets 19A and 19B and the inner yokes
20A and 20B attached to both sides of the plate 14 in the speaker device 10 of the first
embodiment described above. The magnet 49 and the inner yoke 50 are attached only to one
side (the right side opposite to the diaphragm 17 in the illustrated example) of the two.
[0058]
The configuration of the other parts is substantially the same as the configuration of the speaker
device 10 of the first embodiment of FIG. 2, and the same components as those of the speaker
device 10 of FIG.
[0059]
In the speaker device 40, the magnetic lines of force of the magnetic field formed by the magnets
49 are directed from the plate 14 magnetized in the N pole toward the opposing outer yoke 12
and pass through the outer yoke 12 in the right direction of FIG. Then, the outer yoke 12 is
directed to the inner yoke 50 facing the inner circumferential surface of the outer yoke 12, and
the inside of the inner yoke 50 is returned to the magnet 49.
[0060]
In this state, for example, when current flows through the voice coil 13, an electromagnetic force
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is generated according to Fleming's law, and the diaphragm 17 is vibrated together with the plate
14 by the voice coil 13 being fixed.
[0061]
It is a perspective view which shows the usage example of the conventional speaker apparatus.
It is a sectional side view which shows 1st Example of embodiment of this invention.
It is sectional drawing in the III-III line of FIG.
It is explanatory drawing which shows the structure of the magnetic circuit in the speaker
apparatus of the example.
It is a sectional side view which shows the 1st usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 2nd usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 3rd usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 4th usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 5th usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 6th usage example of the speaker apparatus of the
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example.
It is a sectional side view which shows the 7th usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 8th usage example of the speaker apparatus of the
example.
It is a sectional side view which shows the 9th usage example of the speaker apparatus of the
example.
It is a sectional side view which shows 2nd Example of embodiment of this invention.
It is a sectional side view which shows 3rd Example of embodiment of this invention.
Explanation of sign
[0062]
10, 30, 40 Speaker device 11 Casing 11A Connection bar 12 Outer yoke (outer yoke member) 13
Voice coil (voice coil member) 14 Plate (plate member) 15 Center shaft 16 Damper (damper
Members 17, 37 ... Vibration plate (diaphragm member) 18 ... Edges (edge members) 19A, 19B,
49 ... Magnets (Magnet members) 20A, 20B, 30A, 30B, 50 ... Inner yoke (inner yoke member)
20Aa, 20Ba, 30Aa, 30Ba ... Body part 30Ac, 30Bc ... Outer end portion P, P1, P3, P4, P5, P6, P7,
P11 ... Pipe (acoustic resonance member) P2, P12 ... Horn (acoustic resonance member) P8, P9 ...
Band pass regenerator (acoustic resonance member) P10 ... Helmholtz resonator (acoustic
resonance member
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