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DESCRIPTION JP2004187236

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DESCRIPTION JP2004187236
A speaker device capable of suppressing the occurrence of intermodulation distortion is
provided. A magnetic circuit including a magnet and a yoke, a voice coil disposed in a magnetic
gap of the magnetic circuit, and a substantially disk-shaped diaphragm capable of vibrating in a
state of being coupled to the voice coil. In the speaker device 10 including the holder 25 and the
holder 24 connected to the peripheral edge of the diaphragm 25 and fixed to the housing 11, the
holder 24 is formed of a hybrid material of resin and tungsten. Polypropylene is preferred as the
resin. In addition, it is preferable that the specific gravity of the holder 24 be 10.0 or more.
[Selected figure] Figure 2
Speaker device
TECHNICAL FIELD [0001] The present invention relates to a speaker device. 2. Description of the
Related Art Various speaker devices have been conventionally disclosed (see, for example, Patent
Document 1 and Patent Document 2). Further, as a speaker device that is often used for home
use and car use in recent years, there is one as shown in FIG. The speaker device 100 is of a
moving coil type, and an annular magnet 104 is disposed on the top of the pole yoke 106, and an
annular plate 105 is disposed on the top of the annular magnet 104. A magnetic circuit 107 is
formed by the pole yoke 106, the annular magnet 104, and the annular plate 105. A voice coil
102 wound around an end of a voice coil bobbin 103 is disposed in a magnetic gap 107 a of the
magnetic circuit 107, and the voice coil bobbin 103 is a cone-shaped diaphragm having a
substantially conical shape. It is fixed to the central hole. A cap 113 is attached to the central
hole. The diaphragm 101 is elastically supported on the frame 112 by the resin diaphragm
holder 101a via the edge 108 and the damper 109, whereby the diaphragm 101, the voice coil
102 and the voice coil bobbin 103 are integrated. Vibration is possible in the central axis X
direction of the speaker device 100. In addition, positive and negative input terminals 110 are
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attached to the frame 112, and both ends of the voice coil 102 are electrically connected to the
positive and negative input terminals 110 through lead wires (twin wire) 111 respectively. ing.
Then, when a drive signal (drive current) is supplied to the input terminal 110, the voice coil 102
receives an electromagnetic drive force corresponding to the drive signal in the magnetic gap
107a of the magnetic circuit 107, whereby the voice coil 102 The vibration coil 101 vibrates in
the direction of the central axis X of the speaker device 100 integrally with the voice coil bobbin
103 and the diaphragm 101, and the diaphragm 101 emits acoustic energy according to the
drive signal. In some cases, a magnetic circuit is formed by using an exciting coil acting as an
electromagnetic magnet instead of the magnet 104. [Patent Document 1] Japanese Patent
Publication No. 56-15196 (Page 1, FIG. 1) [Patent Document 2] Japanese Utility Model
Application Publication No. 57-106387 (Page 2-3, FIG. 1) When the resin-made diaphragm
holder 101a is used as described above, the vibration of the diaphragm 101 and the vibration of
the magnetic circuit 107 are fused to easily cause intermodulation distortion. A problem arises.
The problem to be solved by the present invention is, as an example, the problem of the
occurrence of intermodulation distortion that occurs in the above-mentioned prior art. The
invention according to claim 1 comprises a magnetic circuit including a magnet and a yoke, a
voice coil disposed in a magnetic gap of the magnetic circuit, and a voice coil coupled to the voice
coil. A speaker device comprising: a substantially disk-shaped diaphragm capable of vibrating in
a broken state; and a holder connected to the periphery of the diaphragm and fixed to a housing,
the holder being made of a hybrid material of resin and tungsten It is characterized by BEST
MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention
will be described based on the drawings. FIG. 2 is a cross-sectional view of the speaker device
according to the present invention, FIG. 3 is a rear view of the speaker device, and FIG. 4 is a
front view of the speaker device. The speaker device 10 has a substantially hemispherical shelllike housing 11 on the outside, and has a circular opening 12 on one side. At the center of the
opening 12, a dome portion 13 which is a conical center cap is provided to project forward (left
side in FIG. 2). A yoke 14 is attached to the inner frame 11 a of the housing 11 by a screw 15,
and a dome portion 13 is attached to the yoke 14 by a screw 16. On the outer periphery of the
yoke 14, a magnet 19 is provided which forms a magnetic circuit 18 by forming a magnetic gap
17 with the yoke 14. The magnet 19 may be excited by a DC power supply, or may be a
permanent magnet. A voice coil 20 made of a thin copper wire or the like is provided in the
magnetic gap 17 so as to be movable back and forth. A damper 21 is provided in the magnetic
gap 17 and supports the voice coil 20 so as to be accurately positioned in the magnetic gap 17.
The damper 21 has elasticity so that it can flexibly follow the back and forth movement of the
voice coil 20. Plates 22 a and 22 b are provided concentrically around the dome portion 13. The
inner peripheral edge of the inner plate 22 a is fixed between the dome portion 13 and the yoke
14 via the mounting material 23. Further, the outer peripheral edge of the outer plate 22 b is
fixed between the outer peripheral edge of the outer plate 22 b and the magnet 19 provided on
the outer side of the yoke 14 by the diaphragm holder 24 as a holder.
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If the diaphragm holder 24 is made of resin as in the prior art, the vibration of the diaphragm 25
and the vibration of the magnetic circuit 18 to be described later will be fused by a material
having a low damping factor, causing intermodulation distortion. The speaker device 10 is
formed using a material to be described later. A diaphragm 25, which is a substantially discshaped diaphragm, is provided in front of the two plates 22a and 22b, and the inner peripheral
edge of the diaphragm 25 is fixed between the dome portion 13 and the mounting member 23.
The outer peripheral edge of the diaphragm is attached to the diaphragm holder 24. A central
portion in the width direction of the diaphragm 25 is connected to the voice coil 20 via a gap 22c
between the plates 22a and 22b. In the vicinity of the inner peripheral edge and the outer
peripheral edge of the diaphragm 25, edges 26a and 26b are provided concentrically. The edges
26a and 26b are bent in a substantially arc shape to allow the diaphragm 25 to vibrate smoothly
and to suppress abnormal movement during vibration. A back chamber 27 is provided at the rear
of the housing 11, and a sound absorbing material 28 is packed inside the back chamber 27. In
addition, a pair of speaker terminals 29 a and 29 b are attached to the back of the housing 11
with screws 30 for positive and negative electrodes. On the other hand, a plurality of (here, five,
for example) diffusers 31 are attached to the front edge of the housing 11 at equal intervals by
screws 32. The diffuser 31 protects the diaphragm 25 and the like and diffuses high-pitched
high-pitched sound. Accordingly, when a signal current flows from the speaker terminals 29 a
and 29 b to the voice coil 20, the voice coil 20 generates a magnetic field, and the voice coil 20
vibrates back and forth by the action with the magnetic circuit 18. It vibrates back and forth to
generate sound as a compressional wave of air. Next, the response in the case where a high
specific gravity and high damping material is used for the diaphragm holder 24 will be described
with reference to the drawings. 5A and 5B show an impulse response waveform and an impulse
response in the speaker device 10 according to the present invention. As a high specific gravity
and high damping material for forming the diaphragm holder 24, a hybrid material of resin /
tungsten having a specific gravity of 10.0 or more was used. Preferably, polypropylene is used as
the resin.
6 to 11 show impulse response waveforms and impulse responses when various materials
conventionally used are used for the diaphragm holder 24. FIG. That is, when PP (polypropylene)
having a specific gravity of 0.9 is used in FIGS. 6A and 6B, ABS (acrylonitrile butadiene styrene
resin) having a specific gravity of 1.2 in FIGS. 7A and 7B. 8 (A) and 8 (B) use aluminum of specific
gravity 2.7, and FIGS. 9 (A) and 9 (B) use zinc of specific gravity 7.2. A) and (B) show the case
where a specific gravity of 8.5 is used, and FIGS. 11 (A) and (B) show the case where tungsten
having a specific gravity of 19.3 is used. Aluminum die casting is generally used to increase the
rigidity of the diaphragm holder 24. Although such a diaphragm holder has the merit of being
lightweight and thick, the resonance inherent to the material is large. In addition, in order to
accurately transmit the sound from the vibration system, the diaphragm holder supporting the
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vibration system was required to further decrease the attenuation and increase the specific
gravity. The target is the amount of damping of the alloy and the specific gravity over the alloy.
Although pure tungsten was examined, attention was paid to resin tungsten, and as a result of a
large number of material compounds, it became a material that could achieve the goal. As
described above, since the diaphragm holder 24 is made of a hybrid material of resin / tungsten,
it has a high specific gravity and high attenuation as compared with the conventional diaphragm
holder 24, and the diaphragm 25 and the magnetic circuit 18 are Vibrations are difficult to fuse,
and intermodulation distortion does not easily occur. In addition, by using polypropylene as the
resin, tensile strength can be increased and the weight can be made lighter than the alloy. Here,
the reason why the specific gravity is 10.0 or more is that the damping ratio is low when the
specific gravity is 9 or less, and it becomes brittle when the specific gravity is 12.0 or more. As a
result, since the specific gravity and the attenuation are high as compared with the conventional
diaphragm holder, the weight of the entire outer diameter volume of the speaker device 10 can
be increased as it is, and the reaction component of the magnetic circuit 18 is reduced. Cross
modulation can be reduced. The speaker device 10 of the present invention is not limited to the
above-described embodiment, and appropriate modifications, improvements, and the like can be
made. For example, in the above-mentioned embodiment, although the dome-shaped speaker
apparatus was demonstrated, it is applicable to a cone-shaped speaker apparatus similarly.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
speaker device. FIG. 2 is a cross-sectional view of the speaker device according to the present
invention. 3 is a rear view seen from the direction III in FIG. 2; 4 is a front view as viewed from
the IV direction in FIG. 2; FIG. 5 is a graph showing an impulse response waveform and an
impulse response of the speaker device according to the present invention. FIG. 6 is a graph
showing an impulse response waveform and an impulse response of a speaker device using PP as
a material of a diaphragm holder. FIG. 7 is a graph showing an impulse response waveform and
an impulse response of a speaker device using ABS as a material of a diaphragm holder. FIG. 8 is
a graph showing an impulse response waveform and an impulse response of a speaker device
using aluminum as a material of a diaphragm holder. FIG. 9 is a graph showing an impulse
response waveform and an impulse response of a speaker device using zinc as a material of a
diaphragm holder. FIG. 10 is a graph showing an impulse response waveform and an impulse
response of a speaker device using brass as a material of a diaphragm holder. FIG. 11 is a graph
showing an impulse response waveform and an impulse response of a speaker device using
tungsten as a material of a diaphragm holder. [Description of the code] 10 speaker device 11
housing 17 magnetic gap 18 magnetic circuit 20 voice coil 24 diaphragm holder (holder) 25
diaphragm (diaphragm)
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