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DESCRIPTION JP2007036867

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DESCRIPTION JP2007036867
PROBLEM TO BE SOLVED: To design a speaker having a sufficiently low minimum resonance
frequency Fo and disperse support in the major axis direction and support in the minor axis
direction, and roll the minor axis direction of the voice coil at the time of large input vibration. To
prevent. SOLUTION: The speaker damper of the present invention includes an outer damper 7
and an inner damper 11. The outer damper 7 supports the outer periphery of the voice coil 5 in
the vibrating portion and supports the outer periphery of the voice coil 5 with respect to the
frame 10. The inner damper 11 supports the inner periphery of the voice coil 5 and supports the
inner periphery of the voice coil 5 with respect to the pole. [Selected figure] Figure 1
SPEAKER DAMPER AND SPEAKER DAMPER ASSEMBLING METHOD
[0001]
The present invention relates to a speaker damper used for a speaker or the like, and a method of
assembling the speaker damper.
[0002]
Heretofore, a damper has been used for the speaker, which serves to damp the voice coil of the
vibrating section so as to correctly hold it in the pole space between the pole and the plate.
FIG. 15 is a view showing a conventional damper shape, and FIG. 15A is a track type damper, FIG.
15B is an inner damper, and FIG. 15C is a butterfly damper.
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[0003]
In order to narrow the width of the diaphragm of the speaker, as shown in FIG. 15A, there is a
method of using a track-type damper 151 on the outer periphery of a track-type voice coil 152
having a short diameter and a long diameter. According to the method of using the track type
damper 151, the width of the diaphragm can be reduced to about the width corresponding to the
short diameter of the track type damper 151.
[0004]
Further, as shown in FIG. 15B, there is also a method of using a damper 153 inside a track type
voice coil 154 having a short diameter and a long diameter, and a method using a damper 155
inside a circular voice coil 156. According to the method of using the damper 153 inside the
track type voice coil 154, the width of the diaphragm can be reduced to about the width
corresponding to the short diameter of the track type voice coil 154 or the diameter of the
circular voice coil 156. It becomes possible.
[0005]
Further, as shown in FIG. 15C, a method using a butterfly damper 157 including a frame portion
158 supporting the outer periphery of the voice coil 161 and a pair of support portions 159 and
160 supporting the frame portion 158 from both sides in the major axis direction. Is also
proposed. In the method using the butterfly damper 157, since there is no support in the minor
axis direction, the minimum resonance frequency Fo of the diaphragm does not increase, and the
width of the diaphragm of the speaker can be narrowed. Furthermore, methods for eliminating or
simplifying the damper have also been proposed. With these methods as well as the butterfly
damper, it is possible to obtain a sufficiently low minimum resonance frequency Fo.
[0006]
In addition, one end is fixed in the longitudinal direction of the voice coil and the other end is
fixed to the frame that holds the magnetic circuit in order to realize sound emission with less
harmonic distortion from the low frequency region to the high frequency region with flat
frequency response. There is also proposed an electroacoustic transducer in which each of the
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above hook type suspensions is provided at both ends of the voice coil (Patent Document 1).
[0007]
Further, the voice coil has a long axis direction and a short axis direction, and a plurality of
movable arms are formed along the long axis direction, and at least two of the plurality of
movable arms near the voice coil support portion side A speaker damper is also proposed in
which a reinforcing member bridged between the movable arms of the above is disposed
substantially parallel to the short axis direction (Patent Document 2).
Patent Document 1: Japanese Patent Application Publication No. 2003-47089 Patent Document
3: Japanese Patent No. 3506855
[0008]
However, in the case of the method using the track type damper 151 shown in FIG. 15A, since
the length of the damper 151 in the short diameter direction becomes short, the stiffness
indicating the hardness of the diaphragm material such as the cone edge and the damper
becomes high. Then, the lowest resonance frequency Fo, which is the lower limit of the
reproduction band, is increased. Therefore, in order to design a speaker having a sufficiently low
minimum resonance frequency Fo, it is necessary to increase the width of the damper in the
short diameter direction, which causes a disadvantage that the width of the speaker is increased.
[0009]
Further, according to the method of using the damper 153 inside the voice coil 154 shown in
FIG. 15B, the width of the damper 153 is only half of the inner diameter of the voice coil 154,
and there is a disadvantage that the lowest resonance frequency Fo increases. Furthermore, in
the method using the butterfly damper 157 shown in FIG. 15C, only the support in the long
diameter direction is supported, and the support in the short diameter direction is lost, so the
voice coil 161 has a short diameter during vibration at a large level signal input. There was a
problem of rolling in the direction.
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[0010]
In addition, since the damper serves to mechanically support the vibration system such as the
diaphragm and the voice coil, the method of eliminating or simplifying the damper mechanically
converts the vibration system such as the diaphragm or the voice coil. Since the damper has a
role to support, there is a disadvantage that the voice coil may roll when a low input resistance
indicating a response of vibration to an input signal is low and a large level signal is input.
[0011]
Further, in the technology described in Patent Document 1, although the hook type suspension is
supported only in the longitudinal direction of the voice coil, there is no support in the lateral
direction, and thus the voice coil is rolled in the lateral direction. there were.
[0012]
Further, in the technology described in Patent Document 2, although the major axis direction of
the damper is supported by a plurality of movable arms, the minor axis direction is reinforced
and disposed parallel to the minor axis direction between the two movable arms. It is only a
member.
Therefore, only reinforcement of the two movable arms can be performed by this reinforcing
member, and there is no support in the minor axis direction, so there is a problem that the voice
coil is rolled in the minor axis direction.
[0013]
Therefore, the present invention can design a speaker having a sufficiently low minimum
resonance frequency Fo while dispersing the support in the major axis direction and the support
in the minor axis direction, and the minor axis direction of the voice coil at the time of large input
vibration. It is an object of the present invention to provide a speaker damper and a method for
assembling a speaker damper which can prevent the rolling of the gear.
[0014]
In order to solve the above problems and achieve the object of the present invention, the speaker
damper of the present invention supports the outer periphery of the voice coil in the vibrating
portion and supports the outer periphery of the voice coil with respect to the fixed portion. A
damper, and an inner damper that supports the inner periphery of the voice coil and supports
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the inner periphery of the voice coil with respect to the fixed portion.
[0015]
As a result, the vibration system is firmly supported by supporting the outer damper of the voice
coil in the major axis direction and the inner damper in the minor axis direction so that the voice
coil does not roll even if a large input is input. Can be
Therefore, it is possible to provide a speaker that reproduces a sound with little distortion not
only at high input resistance but also at high input.
Further, according to the damper structure of the present invention, since the lowest resonance
frequency Fo, which is the lower limit of the reproduction frequency of the speaker, is not
increased, reproduction can be performed to a sufficiently low frequency range with the narrow
speaker.
As a result, it is possible to provide a speaker having a high input resistance and a small widthdirection size in the reproduction band.
[0016]
Further, the method for assembling a damper for a speaker according to the present invention
uses a jig which is fitted to the inner periphery of a track type voice coil having a minor axis and
a major axis of the vibrating portion and is also fitted to the outer periphery of a pole of the
fixing portion In the fixed position, attach the frame that supports the outer periphery of the
voice coil and the outer periphery of the voice coil and attach a pair of support parts that support
the frame and the long diameter of the frame among the fixed parts from both sides The outer
damper is assembled by bonding to bond the frame that supports the inner circumference of the
voice coil and the inner circumference of the voice coil, as well as a pair that supports the short
diameter of the pole of the fixed part and the frame from both sides The inner damper is
assembled by bonding the support portion of the above through the mounting portion.
[0017]
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Thus, the vibration system is firmly fixed by fixing the bonding of the support in the long
diameter direction with the outer damper on the outer side of the voice coil and the bonding of
the support in the short diameter direction with the inner inner damper using a jig. It is
supported, and even if a large input is input, it is possible to prevent rolling of the voice coil and
the like.
Therefore, it is possible to provide a speaker that reproduces a sound with little distortion not
only at high input resistance but also at high input. Further, by using the damper according to
the present invention, since the lowest resonance frequency Fo, which is the lower limit of the
reproduction frequency of the speaker, is not increased, it is possible to reproduce the low
frequency band with a narrow speaker. Therefore, it is possible to provide a speaker having a
high input resistance and a small width dimension in the reproduction band.
[0018]
According to the present invention, the vibration system is firmly supported by supporting the
long diameter direction with the outer damper on the outer side of the voice coil and the short
diameter direction with the inner damper on the inner side so that rolling does not occur even if
a large input is input. Therefore, it is possible to reproduce not only high input resistance but
also sound with less distortion even at large input. Further, according to the damper of the
present invention, since the lowest resonance frequency Fo, which is the lower limit of the
reproduction frequency of the speaker, is not increased, reproduction can be performed to a
sufficiently low frequency range by the narrow speaker.
[0019]
Hereinafter, embodiments of the present invention will be described in detail using the drawings.
FIG. 1 is an explanatory view of a speaker vibration portion. A speaker unit is configured by
including a speaker vibrating portion as shown in FIG.
[0020]
The center cap 2 is provided to prevent radial deformation of the cone 1 and to prevent iron
powder and dust from entering the air gap.
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[0021]
The outer damper 7 supports the outer periphery of the voice coil 5 in the longitudinal direction
by one end of the support portion, and the other end of the support portion is attached to a fixed
portion such as the frame 10 or the like.
Further, the inner damper 11 supports the inner periphery of the voice coil 5 by the short
diameter direction support portion, attaches the support portion to a fixing portion such as the
pole 6, and holds the voice coil 5 around the pole 6 correctly. Arrows 8 are for securing the edge
9 of the cone 1 to the frame 10.
[0022]
FIG. 2 is a perspective view of an outer damper, an inner damper, and a voice coil. FIG. 2A is an
outer damper, FIG. 2B is an inner damper, and FIG. 2C is a voice coil. In FIG. 2A, the outer damper
7 includes a frame portion 12 for supporting the outer periphery of the voice coil 5, a pair of
support portions 13 and 14 for supporting the long diameter of the frame portion 12 from both
sides, and fixing portions for both support portions 13 and 14. And mounting portions 15 and 16
to be attached to the frame 10.
[0023]
In FIG. 2B, the inner damper 11 includes a frame portion 21 for supporting the inner periphery
of the voice coil 5, a pair of support portions 22 and 23 for supporting the short diameter of the
frame portion 21 from both sides, and both support portions 22 and 23. It has the attaching
parts 24 and 25 attached to the pole 6 of fixing | fixed part. In FIG. 2C, the voice coil 5 is formed
of a track type having a short diameter and a long diameter, and a winding frame portion 26
which is a coil bobbin, a coil portion 27 wound around the winding frame portion 26, and a lead
drawn from the coil portion And a line 28.
[0024]
FIG. 3 is a perspective view showing the voice coil with the outer damper and the inner damper
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attached. In FIG. 3, the outer damper 7 supports the outer periphery of the voice coil 5 by fitting
the outer periphery of the track type voice coil 5 having the short diameter and the long
diameter of the vibrating portion in the frame portion 12. Further, the pair of support portions
13 and 14 supports the major diameter of the frame portion 12 from both sides. Then, mounting
portions 15 and 16 provided at both ends of the support portions 13 and 14 fix and attach both
the support portions 13 and 14 to the frame 10 of the fixing portions.
[0025]
The inner damper 11 supports the inner periphery of the voice coil 5 by fitting the inner
periphery of the track type voice coil 5 having the above-described short diameter and long
diameter outside the frame portion 21. Further, the pair of support portions 22 and 23
alternately supports the short diameter of the frame portion 21 from both sides. Then, the
mounting portions 24 and 25 provided in the L shape at both ends of the supporting portions 22
and 23 alternate between the supporting portions 22 and 23 on the upper surface of the pole 6
of the fixing portions disposed inside the voice coil 5. Fix and attach.
[0026]
The voice coil 5 configured as a track type having a short diameter and a long diameter is shared
by the outer outer damper 7 in the long diameter direction indicated by XX and the inner inner
damper 11 in the short diameter direction indicated by YY. Be supported. Thus, the vibration
system is properly damped so as to be properly held in the magnetic pole space between the pole
6 and the plate (not shown), so that the vibration system is firmly supported. The voice coil 5 can
be prevented from rolling or the like.
[0027]
FIG. 4 is a view showing an example of the cloth damper, FIG. 4A is a front view, FIG. 4B is an XX
cross-sectional view, and FIG. 4C is a YY cross-sectional view. In FIGS. 4A and 4B, the outer
damper 31 supports the outer periphery of the voice coil 5 by fitting the outer periphery of the
track type voice coil 5 having the short diameter and the long diameter of the vibrating portion
in the frame portion 33. . Further, a pair of support portions 32 and 34 made of cloth in which
the major diameter of the frame portion 33 is folded back in a wave shape is supported from
both sides. Then, attachment portions (not shown) provided at both ends of the pair of cloth-
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made support portions 32 and 34 folded back in a wavelike manner fix and attach both the
support portions 32 and 34 to the frame 10 of the fixing portions.
[0028]
In FIG. 4B and FIG. 4C, the inner damper 41 supports the inner periphery of the voice coil 5 by
fitting the inner periphery of the track type voice coil 5 having the above-described short
diameter and long diameter outside the frame portion 42. Further, a pair of support portions 43
and 44 made of cloth in which the minor axis of the frame portion 42 is folded back in a wave
shape is alternately supported from both sides. Then, plate-like mounting portions 45, 46
provided in the shape of an L at both ends of the pair of cloth-made support portions 43, 44
folded back in a wavelike manner, both support portions 43, 44 are disposed inside the voice coil
5. It is alternately fixed and attached to the upper surface of the pole 6 of the fixed parts.
[0029]
The voice coil 5 formed of a track type having a minor axis and a major axis is a corrugated outer
cloth 31 provided on the outer side and provided in the longitudinal direction indicated by X-X
by the outer cloth damper 31 provided on the outer side. The short diameter direction shown by
YY by each inner damper 41 is shared and supported. Thus, the vibration system is properly
damped so as to be properly held in the magnetic pole space between the pole 6 and the plate
(not shown), so that the vibration system is firmly supported. The voice coil 5 can be prevented
from rolling or the like.
[0030]
FIG. 5 is a view showing an example of a butterfly damper, FIG. 5A is a front view, FIG. 5B is a
cross-sectional view taken along the line XX, and FIG. 5C is a cross-sectional view taken along the
line YY. In FIGS. 5A and 5B, the outer damper 51 supports the outer periphery of the voice coil 5
by fitting the outer periphery of the track type voice coil 5 having the minor axis and the major
axis of the vibrating portion in the frame portion 52. . In addition, a pair of butterfly-shaped
support portions 53 and 54 in which the major diameter of the frame portion 52 is combined
with an S-shaped plastic member is supported from both sides. Then, mounting portions (not
shown) provided at both ends of a pair of butterfly-shaped supporting portions 53 and 54
combining S-shaped plastic members fix and attach both supporting portions 53 and 54 to the
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frame 10 of the fixing portions. .
[0031]
In FIG. 5B and FIG. 5C, the inner damper 61 supports the inner periphery of the voice coil 5 by
fitting the inner periphery of the track type voice coil 5 having the above-described short
diameter and long diameter outside the frame 62. In addition, a pair of support portions 63 and
64 in which the short diameter of the frame portion 62 is combined with an S-shaped plastic
member is alternately supported from both sides. Then, plate-like attachment portions 65, 66
provided in the L shape at both ends of the pair of support portions 63, 64 combining the Sshaped plastic and connecting the two in the S shape are both support portions 63, 64 are
alternately fixed and attached to the upper surface of the pole 6 of the fixed portions disposed
inside the voice coil 5.
[0032]
The voice coil 5 configured as a track type having a short diameter and a long diameter is made
of plastic provided on the inside in the long diameter direction indicated by XX with a butterflytype outer damper 51 combining an S character provided on the outside. The short diameter
direction shown by Y-Y is each shared and supported by the inner damper 61 which combined S
shape of this. Thus, the vibration system is properly damped so as to be properly held in the
magnetic pole space between the pole 6 and the plate (not shown), so that the vibration system is
firmly supported. The voice coil 5 can be prevented from rolling or the like.
[0033]
FIG. 6 is a view showing an example in which the support portion and the attachment portion of
the inner damper have one or more pairs. FIG. 6 shows an example in which the support portion
and the attachment portion are in three pairs, but it shows that a plurality of pairs can be
provided corresponding to the elongated shape of the speaker. In FIG. 6, the outer damper 51
has an outer periphery of the elongated track-shaped voice coil 5 having a minor axis and a
major axis of the vibrating portion fitted in an elongated frame 52, whereby the outer periphery
of the voice coil 5 is formed. Support. In addition, a pair of butterfly-shaped support portions 53
and 54 in which the major diameter of the frame portion 52 is combined with an S-shaped plastic
member is supported from both sides. Then, mounting portions (not shown) provided at both
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ends of a pair of butterfly-shaped supporting portions 53 and 54 combining S-shaped plastic
members fix and attach both supporting portions 53 and 54 to the frame 10 of the fixing
portions. .
[0034]
The inner damper 61 supports the inner periphery of the voice coil 5 by fitting the inner
periphery of the elongated track-shaped voice coil 5 having the above-described short and long
diameters outside the elongated frame portion 62. In addition, a pair of S-shaped support
portions 67-1 and 67-2 made of plastic and having a short diameter in one short portion of the
frame portion 62 support alternately from both sides. Then, plate-like mounting portions 68-1
and 68-2 provided in an L shape at both ends of the pair of plastic S-shaped supporting portions
671 and 67-2 are both supporting portions 67-1 and 67-. 2 are alternately fixed and attached to
the upper surface of the pole 6 of the fixed portions disposed inside the voice coil 5.
[0035]
Further, in the vicinity of the center of the frame portion 62, a pair of S-shaped support portions
67-3 and 67-4 made of plastic and having a short diameter alternately support from both sides.
Then, plate-like mounting portions 68-3 and 68-4 provided in an L shape at both ends of the pair
of plastic S-shaped supporting portions 67-3 and 67-4 are both supporting portions 67-3 and
67-3. 67-4 are alternately fixed and attached to the upper surface of the pole 6 of the fixed
portions arranged inside the voice coil 5. Here, a plurality of pairs of support portions 67-3 and
67-4 and attachment portions 68-3 and 68-4 provided near the center of the frame portion 62
may be provided.
[0036]
In addition, a pair of S-shaped support portions 67-5 and 67-6 made of plastic and having a short
diameter at the other short portion of the frame portion 62 support alternately from both sides.
Then, plate-like mounting portions 68-5 and 68-6 provided in an L shape at both ends of the pair
of plastic S-shaped supporting portions 67-5 and 67-6 are both supporting portions 67-5 and
67-5. 67-6 are alternately fixed and attached to the upper surface of the pole 6 of the fixed
portions arranged inside the voice coil 5.
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[0037]
The voice coil 5 formed of a long track-shaped track type having a short diameter and a long
diameter has a long axis direction indicated by X-X with a butterfly-shaped long outside shaped
damper 51 combining an S-shaped plastic provided on the outside 5A) is supported, and a short
diameter direction (see FIG. 5A) indicated by Y-Y is supported by an elongated inner damper 61
combining an S-shaped plastic provided on the inside. Thus, the voice coil 5 is shared and
supported by the outer damper 51 and the inner damper 61. As a result, the vibration system is
properly damped and held firmly in the magnetic pole space between the pole 6 and the plate
(not shown), so that even if a large input is input, the elongated voice coil 5 is Y It is possible to
prevent rolling or the like in the minor axis direction indicated by -Y.
[0038]
In the embodiment described above, the outer damper and the inner damper are separately
provided. However, the present invention is not limited to this. The outer damper and the inner
damper may be integrally formed. FIG. 7 is a diagram showing an example in which the outer
damper and the inner damper are integrated. The only difference between FIG. 7 and the
vibrating portion shown in FIG. 1 is that the outer damper 71 and the inner damper 75 are
integrally formed via the connecting portion 79.
[0039]
In this case, a portion which can not be directly adhered to the voice coil 5 of the cone 1 serving
as the diaphragm is adhered to the connecting portion 79. The connecting portion 79 connects
the frame portion 72 of the outer damper 71 and the frame portion 76 of the inner damper 75 in
a U-shape. Thus, the connecting portion 79 is formed to sandwich the upper end portion of the
voice coil 5, and the mounting portion 78 is fixed to the upper surface of the pole 6 disposed
inside the voice coil 5 in order to attach the inner damper 75 to the pole 6. Is attached.
[0040]
FIG. 8 is a view showing a connection state of the outer damper and the inner damper. FIG. 8
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shows a state in which the support portion and the attachment portion of the inner damper of
FIG. 6 are only one pair, and the outer damper and the inner damper are connected via the
connection portion. In FIG. 8, the outer damper 81 supports the outer periphery of the voice coil
5 by fitting the outer periphery of the track type voice coil 5 having the minor axis and the major
axis of the vibrating portion in the frame portion 82. In addition, a pair of butterfly-type support
portions 83 and 84 in which the long diameter of the frame portion 82 is combined with the
plastic S-shape is supported from both sides. And attachment parts (not shown) provided at both
ends of a pair of butterfly-shaped support parts 83 and 84 combining S-shaped plastic fix and
attach both support parts 83 and 84 to the frame 10 of the fixing parts. .
[0041]
Here, the frame portion 82 of the outer damper 81 and the frame portion 90 of the inner damper
85 connect the short diameter by the connecting portions 91 and 92 and connect the long
diameter by the connecting portions 93 and 94. At this time, the short diameter connecting
portions 91 and 92 sandwich the upper end portion of the short diameter of the track type voice
coil 5, and the long diameter connecting portions 93 and 94 sandwich the upper end portion of
the long diameter of the track type voice coil 5. Support the short diameter and the long
diameter.
[0042]
The inner damper 85 supports the inner periphery of the voice coil 5 by fitting the inner
periphery of the track type voice coil 5 having the above-described short diameter and long
diameter outside the frame portion 90. In addition, a pair of plastic S-shaped support portions 86
and 87 support the short diameter of the frame portion 90 alternately from both sides. Then,
plate-like mounting portions 88, 89 provided in an L-shape at both ends of a pair of plastic Sshaped supporting portions 86, 87 are poles of the fixing portions arranged inside the voice coil
5. 6 Fix and attach both support parts 86 and 87 to the upper surface.
[0043]
The voice coil 5 configured as a track type having a short diameter and a long diameter is
supported on the inside in the long diameter direction indicated by XX by the plastic S-shaped
butterfly outer damper 51 provided on the outside, and provided inside The short diameter
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direction shown by Y-Y is shared and supported by the plastic S-shaped inner damper 61. At this
time, the short diameter direction is supported by the short diameter connecting portions 91 and
92, and the long diameter direction is shared and supported by the long diameter connecting
portions 93 and 94, respectively.
[0044]
As a result, the vibration system is properly damped and held firmly in the magnetic pole space
between the pole 6 and the plate (not shown), and the voice coil 5 is Y-Y even if a large input is
input. It is possible to prevent rolling or the like in the short diameter direction shown.
[0045]
Next, a method of assembling the outer damper and the inner damper configured as described
above will be described based on FIGS. 9 to 14.
FIG. 9 is a view showing a method of assembling the outer damper when the outer damper and
the inner damper are separate bodies. In FIG. 9, FIG. 10, and FIG. 11, the outer damper 7 and the
inner damper 11 for damping the voice coil 5, which is a vibrating portion, with respect to the
plate 101, the magnet 102 and the frame 10 constituting the fixed portion of the speaker The
method of assembling to
[0046]
First, the voice coil gauge 103 is fitted to the inner periphery of the track type voice coil 5 having
the minor axis and the major axis of the vibrating portion, and is fitted to the outer periphery of
the pole 6 of the fixed portion. Next, at a position where the voice coil 5 is fixed using the voice
coil gauge 103, as shown by 104, the frame 12 of the outer damper 7 supporting the outer
periphery of the voice coil 5 and the outer periphery of the voice coil 5 are bonded. In addition,
the outer damper 7 is assembled by bonding a pair of support portions 13 and 14 supporting the
long diameter of the frame 10 and the frame portion 12 of the fixing portion from both sides via
the attachment portions 15 and 16 (see FIG. 2A) ).
[0047]
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FIG. 10 is a view showing a method of assembling the inner damper 11. After the outer damper 7
is assembled at the position shown in FIG. 9, the voice coil gauge 103 is removed from the inner
periphery of the voice coil 5 and the outer periphery of the pole 6. Since the voice coil 5 can be
positioned by the assembled outer damper 7, the inner damper 11 is inserted into the inner
periphery of the voice coil 5 at that position.
[0048]
Next, as indicated by 111, the frame 21 of the inner damper 11 supporting the inner periphery
of the voice coil 5 and the inner periphery of the voice coil 5 are bonded, and the pole 6 of the
fixed portion and the short side of the frame 21 The inner damper 11 is assembled by bonding a
pair of support portions 22 and 23 supporting the diameter from both sides via the attachment
portions 24 and 25.
[0049]
FIG. 11 is a view showing a method of positioning the inner damper 11.
When assembling the inner damper 11 in FIG. 10, the voice coil gauge 103 from the lower part
of the plate 101 of the track type voice coil 5 having the minor axis and the major axis of the
vibrating portion in order to position more accurately. While fitting on the inner circumference,
fitting on the outer circumference of the pole 6 of the fixed portion.
[0050]
FIG. 12 is a view showing the insertion holes 121, 122, 123, 124 penetrating the outer periphery
of the pole 6 provided at the lower part of the plate 101, FIG. 12A is a bottom view, and FIG. 12B
is a partial sectional view. FIG. 13 is a view showing the shape of the voice coil gauge 103. As
shown in FIG. As shown in FIG. 13, the voice coil gauge 103 forms the insertion portions 135,
136, 137, 138 by providing the notches 131, 132, 133, 134 around the periphery.
[0051]
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Insertion portions 135, 136, 137, 138 shown in FIG. 13 are provided so as to be insertable into
corresponding positions in the insertion holes 121, 122, 123, 124 shown in FIG. 12A. Therefore,
the insertion parts 135, 136, 137, 138 of the voice coil gauge 103 shown in FIG. 13 can be
inserted from the insertion holes 121, 122, 123, 124 in the lower part of the plate 101 shown in
FIG. 12A. When the voice coil gauge 103 is inserted, the notches 131, 132, 133, and 134 of the
voice coil gauge 103 are protruded from the upper end of the pole 6.
[0052]
At this time, since the notch 131 and the notch 133 are provided in the major axis direction, and
the notch 132 and the notch 134 are provided in the minor axis direction, the bonding position
of the frame 21 of the inner damper 11 and the voice coil 5 described above is The positions of
the notches 131 and notches 133 in the major axis direction and the notches 132 and notches
134 in the minor axis direction can be matched. At this position, it is possible to position the
bonding between the mounting portions 24 and 25 of the inner damper 11 and the upper end of
the pole 6.
[0053]
FIG. 14 is a view showing a method of assembling the outer damper 71 and the inner damper 75
when the outer damper 71 and the inner damper 75 are integrated as shown in FIG. First, the
voice coil gauge 103 is inserted into the inner periphery of the track type voice coil 5 having the
minor and major diameters of the vibrating portion via the integral outer damper 71 and the
internal damper 75, and the fixing portion Fit into the outer periphery of the pole 6.
[0054]
At this time, the short diameter connecting portions 91 and 92 shown in FIG. 8 and the long
diameter connecting portions 93 and 94 correspond to the notch 132 and the notch 134 in the
short diameter direction of the voice coil gauge 103 shown in FIG. The position of the direction
notch 131 and the notch 133 can be adjusted.
[0055]
According to the above-described embodiment, in order to narrow the width of the diaphragm of
the speaker, the shape of the voice coil is made to be a voice coil of an irregular shape with a
long diameter, compared with a circular voice coil of the same width. Since the outer periphery of
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the voice coil becomes large, the vibration characteristic at the time of reproduction of the high
output signal can be made superior.
[0056]
At this time, in order to narrow the width, the outer damper of the support system located on the
outside of the voice coil supports only the major axis direction with respect to the frame of the
fixed portion and does not support in the minor axis direction.
This makes it possible to make thinner speakers.
At this time, an internal damper is attached to the inside of the voice coil. The inner damper
inside the voice coil is configured to have a pair of symmetrical pointing parts.
[0057]
Therefore, a pair of pointing portions in the minor axis direction respectively support different
positions of the pole. As a result, although an ordinary inner damper can only cope with an
amplitude corresponding to half the voice coil minor axis, an inner damper can be constructed
which can correspond to an amplitude nearly doubled by the pair of indicator parts. Therefore, it
is possible to form a wide speaker with a low reproduction frequency band of the lowest
resonance frequency Fo.
[0058]
In addition, by supporting the vibration system in the long diameter direction with the outer
damper on the outer side of the voice coil and the short diameter direction with the inner damper
on the inner side, the vibration system is firmly supported. You can do so.
[0059]
Also, the voice coil can be fixed at two points by using the outer damper on the outer side of the
voice coil and the inner damper on the inner side.
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This makes it possible to prevent the deformation of the voice coil that occurs during vibration,
and to prevent the voice coil from rubbing with the magnetic circuit.
[0060]
Furthermore, as a material of the damper, plastic, cotton cloth impregnated with phenol resin,
polyester impregnated with phenol resin, amide fiber impregnated with phenol, metal, bakelite,
etc. can be used. Also, the material of the outer damper on the outer side of the voice coil and the
material of the inner damper on the inner side may be different.
[0061]
Needless to say, the present invention is not limited to the above-described embodiment of the
present invention, and modifications can be made as appropriate within the scope of the claims
of the present invention.
[0062]
It is explanatory drawing of a speaker vibration part.
It is a perspective view of an outer damper, an inner damper, and a voice coil, FIG. 2A is an outer
damper, FIG. 2B is an inner damper, FIG. 2C is a voice coil. It is a perspective view which shows
the state which attached the outer damper and the inner damper to the voice coil. It is a figure
which shows the example of a cloth damper, FIG. 4A is a front view, FIG. 4B is XX sectional
drawing, FIG. 4C is YY sectional drawing. It is a figure which shows the example of a butterfly
damper, FIG. 5A is a front view, FIG. 5B is XX sectional drawing, FIG. 5C is YY sectional drawing.
It is a figure which shows the example in which the support part and attachment part of an inner
damper have one or more pairs. It is a figure which shows the example with which an outer
damper and an inner damper are integral. It is a figure which shows the connection state of an
outer damper and an inner damper. It is a figure which shows the attachment method of the
outer damper in case an outer damper and an inner damper are separate bodies. It is a figure
which shows the attachment method of an inner damper. It is a figure which shows the
positioning method of an inner damper. It is a figure which shows the insertion hole of a pole,
FIG. 12A is a bottom view, FIG. 12B is a partial cross section figure. It is a figure which shows the
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shape of a voice coil gauge. It is a figure which shows the attachment method of the outer
damper in case an outer damper and an inner damper are integral. FIG. 15A shows a track type
damper, FIG. 15B shows an inner damper, and FIG. 15C shows a butterfly damper.
[0063]
DESCRIPTION OF SYMBOLS 5 ... Voice coil, 6 ... Pole, 7 ... Outside damper, 10 ... Frame, ... Inside
damper, 1112 ... Frame part, 13, 14 ... Support part, 15, 16 ... Mounting part, 21 ... Frame part,
22, 23 ... Support part 24, 25 ... mounting part,
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