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JP2006352276

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006352276
PROBLEM TO BE SOLVED: To provide a speaker damper which is less likely to cause rolling at
the time of amplitude propagation by reducing a mechanical property difference between an
axial area and an interaxial area of a woven fabric which is a raw material. SOLUTION: A speaker
damper having a corrugation shape in which projections and depressions are alternately
arranged in the radial direction by sandwiching a resin-impregnated woven fabric 30 between
molds 41 and 42. , 32 axial regions S1 extending in the respective axial directions and the interaxial direction regions S2 extending between the respective axial directions, the molding
conditions by the molds 41 and 42 are made different from each other, thereby forming The
mechanical characteristic difference such as extension or strength between the axial area S1 and
the interaxial area S2 of the product is reduced. [Selected figure] Figure 6
SPEAKER DAMPER AND METHOD FOR MANUFACTURING SPEAKER DAMPER, SPEAKER UNIT
USING THE SPEAKER DAMPER
[0001]
The present invention relates to a speaker damper, a method of manufacturing the speaker
damper, and a speaker unit using the speaker damper.
[0002]
FIG. 1 shows the configuration of a conventional general speaker unit.
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1
The speaker unit 1 includes a magnetic circuit 3, a frame 5 to which the magnetic circuit 3 is
attached at the rear, and a cone having a roll-shaped outer peripheral edge 7 fixed to an edge
support 5a at the front of the frame 5. The diaphragm 9 and the voice coil 12 wound around a
cylindrical voice coil bobbin 11 are provided.
[0003]
The magnetic circuit 3 comprises a yoke 15 having a structure in which a cylindrical center pole
15b is provided at the center of a disk-shaped plate 15a, a ring-shaped magnet 16 loosely fitted
on the outer periphery of the center pole 15b, and a plate 15a. And a ring-shaped top plate 17
loosely fitted on the tip end side of the center pole 15b so as to sandwich the magnet 16
therebetween. A gap between the inner periphery of the top plate 17 and the center pole 15 b is
a magnetic gap 19 in which the voice coil 12 is disposed.
[0004]
An opening for inserting the voice coil bobbin 11 is formed at the center of the diaphragm 9. The
edge 7 joined to the outer peripheral edge of the diaphragm 9 is between the edge support 5a
and the ring-shaped gasket 21 whose attachment flange mounted on the outer periphery of the
edge 7 is attached to the edge support 5a. And fixed to the edge support 5a. The inner peripheral
edge 9a of the diaphragm 9 forming the opening is fixed to the outer periphery of the voice coil
bobbin 11 inserted in the opening by adhesion or the like.
[0005]
Further, a dust cap 23 is attached to a central portion of such a diaphragm 9. The dust cap 23
covers the front of the voice coil bobbin 11 to prevent dust and the like from entering the
magnetic gap 19. The cylindrical voice coil bobbin 11 is loosely fitted on the outer periphery of
the center pole 15b so as to be axially movable, and is elastically supported by the frame 5 via
the damper 25 so as to restrict axial movement. Then, the diaphragm 9 is vibrated by the
reciprocation vibration of the voice coil bobbin 11 accompanying the input signal to the voice
coil 12 to reproduce the sound.
[0006]
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2
The damper 25 is called a corrugation damper, and as shown in FIGS. 2A to 2C, the woven fabric
30 impregnated with a thermosetting resin is sandwiched between male and female molds 38
and 39. For example, after forming corrugation shapes (bellows shapes) 25a in which projections
and depressions are alternately arranged in the radial direction by heat forming, as shown in FIG.
2 (d), a disc shape (donut They are formed by trimming in a disc shape (see, for example, Patent
Document 1).
[0007]
The outer peripheral edge of the damper 25 is fixed to the damper support portion 5b of the
frame 5, and the inner peripheral edge is fixed to the outer periphery of the voice coil bobbin 11,
restricts displacement of the voice coil bobbin 11 in the radial direction. When the plate 9 is
driven, vibration energy is absorbed by deformation of the corrugation, and vibration control of
the diaphragm 9 is performed.
[0008]
In addition, as a weave structure of the woven fabric 30 used for the damper 25, as shown in FIG.
3, a biaxial weave (plain weave) in which two fibers (weave yarns) 31 and 32 in the vertical and
horizontal directions are woven is generally used. (See, for example, Patent Document 2).
[0009]
JP, 2001-189991, A JP, 11-234796, A
[0010]
By the way, in the formation of the damper by the conventional mold, the weaving direction and
the like of the yarns 31 and 32 of the woven fabric 30 are not particularly considered.
However, in the biaxial woven fabric 30 as shown in FIG. 3, the open angle between the yarns 31
and 32 in each of the longitudinal and transverse axial directions is 90 degrees, and the axial
direction of the longitudinal and transverse yarns and these axial directions On the other hand,
there is a large difference in stretchability and strength in the direction of the axis which
intersects obliquely (in particular, the oblique direction inclined at an angle of 45 degrees with
respect to the two axial directions as shown by arrow A in FIG. 3).
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3
[0011]
Therefore, the conventional damper 25 has a corrugation shape formed by setting various
molding conditions such as the clearance between male and female molds the same over the
entire area of the woven fabric without considering the axial direction and the interaxial direction
of the woven fabric. At the time of molding, the highly stretchable inter-axial direction region on
the woven fabric 30 is greatly extended, and the mechanical property difference between the
axial region and the inter-axial direction region is emphasized as it is or is further left.
[0012]
As a result, when the amplitude of the voice coil bobbin 11 propagates in a state of being
incorporated in the speaker unit, the stress balance in the woven fabric 30 is lost, and as shown
in FIG. The displacement of the corrugation is largely different between B and the inter-axial
directions C and D which are inclined 45 ° from the axial direction, and there is a problem that
rolling which easily prevents the smooth movement of the voice coil bobbin 11 easily occurs.
In addition, the rolling of the voice coil bobbin 11 causes an abnormality in the vibration of the
diaphragm 9, causing a problem that the acoustic characteristic of the speaker is deteriorated.
[0013]
As the problem to be solved by the present invention, due to the mechanical property difference
between the axial area and the inter-axial area of the woven fabric as the raw material, which
occurs in the above-mentioned prior art, The problem is that the stress balance of the above is
broken, and rolling that easily impedes the smooth movement of the voice coil bobbin is likely to
occur.
[0014]
In order to solve the above-mentioned subject, the damper for speakers according to claim 1 is a
speaker in which a corrugation shape in which unevenness is arranged alternately in the radial
direction is formed by sandwiching resin-impregnated woven fabric in a mold. A damper for
forming molding conditions by a mold with axially extending axial regions of mutually crossing
yarns of the woven fabric and an interaxially extending region extending between the respective
axial directions; It is characterized in that they are molded differently.
[0015]
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The method for manufacturing a speaker damper according to claim 8 is a method for
manufacturing a speaker damper in which a woven fabric impregnated with a resin is
sandwiched between molds to form a corrugation shape in which concavities and convexities are
alternately arranged in the radial direction, The molding conditions by the mold are made to
differ between the axially extending axial regions of the mutually crossing yarns of the woven
fabric and the interaxial direction regions extending between the respective axial directions. It is
characterized by
[0016]
The speaker unit according to claim 9 is characterized in that the vibration system is supported
by the speaker damper according to any one of claims 1 to 7.
[0017]
Hereinafter, preferred embodiments of a speaker damper according to the present invention will
be described in detail with reference to the drawings.
FIG. 5 is a longitudinal sectional view showing a configuration of a speaker unit using the
speaker damper according to the first embodiment of the present invention, and FIG. 6 is an
explanatory view of a manufacturing process of the speaker damper shown in FIG.
[0018]
In the speaker unit 61 shown in FIG. 5, the magnetic circuit 3, the frame 5 to which the magnetic
circuit 3 is attached at the rear, and the roll edge 7 on the outer periphery are fixed to the edge
support 5a at the front of the frame 5. The configuration is provided with a conical diaphragm 9
and a voice coil 12 wound around a cylindrical voice coil bobbin 11.
[0019]
The magnetic circuit 3 comprises a yoke 15 having a structure in which a cylindrical center pole
15b is provided at the center of a disk-shaped plate 15a, a ring-shaped magnet 16 loosely fitted
on the outer periphery of the center pole 15b, and a plate 15a. And a ring-shaped top plate 17
loosely fitted on the tip end side of the center pole 15b so as to sandwich the magnet 16
therebetween.
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A gap between the inner periphery of the top plate 17 and the center pole 15 b is a magnetic gap
19 in which the voice coil 12 is disposed.
[0020]
An opening for inserting the voice coil bobbin 11 is formed at the center of the diaphragm 9.
The edge 7 joined to the outer peripheral edge of the diaphragm 9 is between the edge support
5a and the ring-shaped gasket 21 whose attachment flange mounted on the outer periphery of
the edge 7 is attached to the edge support 5a. And fixed to the edge support 5a.
The inner peripheral edge 9a of the diaphragm 9 forming the opening is fixed to the outer
periphery of the voice coil bobbin 11 inserted in the opening by adhesion or the like.
[0021]
Further, a dust cap 23 is attached to a central portion of such a diaphragm 9.
The dust cap 23 covers the front of the voice coil bobbin 11 to prevent dust and the like from
entering the magnetic gap 19.
The cylindrical voice coil bobbin 11 is loosely fitted on the outer periphery of the center pole
15b movably in the axial direction, and elastic on the frame 5 via the damper (speaker damper)
40 so that axial movement is restricted. Be supported.
Then, the diaphragm 9 is vibrated by the reciprocating vibration of the voice coil bobbin 11
accompanying the input signal to the voice coil 12 to reproduce the sound.
[0022]
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The outer peripheral edge of the damper 40 is fixed to the damper support portion 5b of the
frame 5, and the inner peripheral edge is fixed to the outer periphery of the voice coil bobbin 11,
restricts the radial displacement of the voice coil bobbin 11, and the diaphragm At the time of
driving 9, vibration energy is absorbed by deformation of the corrugation, and vibration control
of the diaphragm 9 is performed.
[0023]
The damper 40 according to the present embodiment is a so-called corrugation damper, for
example, a female and male mold 41 shown in FIG. 6A which is a biaxial weave (plain weave)
woven fabric 30 impregnated with a thermosetting resin such as a phenol resin. , 42, after
forming into a corrugation shape (bellows shape) in which unevenness is alternately arranged in
the radial direction by heat forming, and then the formed product is trimmed to a required size,
as shown in FIG. Thus, the voice coil bobbin 11 is formed to have predetermined dimensions
including an inner peripheral portion connected to the outer periphery of the voice coil bobbin
11 and an outer peripheral portion fixed to the damper support portion 5 b.
[0024]
In the case of the present embodiment, as shown in FIG. 6C, axial regions S1 extending in the
respective axial directions of the yarns 31 and 32 orthogonal to each other of the woven fabric
30 are extended between the respective axial directions. Elongation and strength between the
axial region S1 and the axial direction region S2 on the damper 40, which is a molded product,
by making the molding conditions of the molds 41 and 42 different from each other in the axial
direction region S2 existing. Etc. are reduced.
[0025]
Specifically, in order to make the molding conditions by the dies 41 and 42 different from each
other, the clearances between the dies 41 and 42 sandwiching the woven fabric 30 are made
different between the axial region S1 and the interaxial direction region S2. The mechanical
characteristic difference between the axial area S1 and the interaxial area S2 of the molded
product, such as the extension and the strength, is reduced.
[0026]
More specifically, in the case of the present embodiment, as shown in FIG. 6A, the clearance C2
between the dies 41 and 42 in the inter-axis direction area S2 is set smaller than the clearance
C1 in the axial area S1. doing.
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As a result, when the molds 41 and 42 sandwich the woven fabric 30, the yarns 31 and 32
present in the inter-axial direction region S2 have a larger frictional force (additional force than
the yarns 31 and 32 present in the axial region S1 Pressure) works.
Therefore, tensile tension acts on the yarns 31 and 32 in the inter-axial direction region S2
where extension easily occurs, and the lattices of the yarns 31 and 32 in the inter-axial direction
region S2 where extension tends to occur are flattened.
Therefore, in any of the axial area S1 and the interaxial area S2, the corrugation shape is
completed while the lattices by the yarns 31 and 32 are substantially equivalent, and the axial
area S1 of the molded article and the interaxial area S2 are completed. And mechanical
characteristics such as elongation and strength between them can be almost eliminated.
[0027]
Therefore, when the amplitude of the voice coil bobbin 11 propagates in a state of being
incorporated into the speaker unit 61, a difference occurs in the displacement of the corrugation
between the axial direction of the yarns 31 and 32 and the interaxial direction inclined 45 °
from the axial direction. Can be prevented, and the occurrence of rolling that hinders the smooth
movement of the voice coil bobbin 11 can be prevented.
As a result, in the speaker unit 61, it is possible to prevent the occurrence of rolling that distorts
the sound and to improve the sound quality and the acoustic characteristics.
[0028]
Note that a specific method for making the molding conditions by the male and female molds 41
and 42 differ between the axial area S1 and the interaxial area S2 of the woven fabric 30 is the
mold 41 shown in the first embodiment, The method is not limited to the method of making the
clearances different.
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For example, as shown in FIGS. 7 to 10, the molding conditions may be different.
[0029]
FIG. 7 shows a second embodiment for differentiating the molding conditions of the male and
female molds 41 and 42 between the axial area S1 and the interaxial area S2 of the woven fabric
30. In the second embodiment, one of the male and female molds 41 and 42 is used to press the
axial region S1 of the woven fabric 30 and the axial region S2 of the woven fabric 30. For
example, as shown in FIG. 7 (b), the mold 41b is first pressed against the mating mold 42 and the
inter-axis direction of the woven fabric 30 is divided. After the pressure forming of the area S2 is
performed, as shown in FIG. 7 (c), the pressure forming of the axial area S1 of the woven fabric
30 is performed by pressing the mold 41a against the counterpart mold 42. Do. Thus, by shifting
the pressure timing by the molds 41a, 41b and 42 between the axial region S1 and the interaxial
direction region S2, the molded product can be positioned between the axial region S1 and the
interaxial direction region S2. Reduce mechanical property differences such as elongation and
strength.
[0030]
In the case of the second embodiment, after completion of the pressure forming on the interaxial
direction region S2, the shaft is made so as not to deform the lattice of the yarns 31 and 32 in
the interaxial direction region S2. In the case of the first embodiment, pressure molding in the
direction area S1 is performed, and the yarns 31 and 32 in the inter-axis direction area S2 are
not deformed by the influence of the pressure in the axial area S1. Similarly, in any of the axial
region S1 and the interaxial direction region S2, the formation of the corrugation shape is
completed while the lattices by the yarns 31 and 32 are substantially equivalent, and the axial
direction S1 between the axial region S1 of the molded article and the interaxial direction It is
possible to almost eliminate mechanical property differences such as extension and strength with
the region S2.
[0031]
FIG. 8 is an explanatory view of the speaker damper 44 according to the third and fourth
embodiments of the present invention, where (a) is an explanatory view of the axial area S1 on
the damper 44 and the interaxial direction area S2, b) is a cross-sectional view of the corrugation
structure in the axial region S1 in the speaker damper 44 of the third embodiment of the present
invention, and FIG. 7C is an inter-axis in the speaker damper 44 of the third embodiment of the
present invention It is sectional drawing of the corrugation structure in direction area | region
S2, (d) is sectional drawing of the corrugation structure in the axial direction area | region S2 in
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the speaker damper which becomes the 4th Embodiment of this invention.
[0032]
The corrugation shape in the axial region S1 shown in FIG. 8B has a waveform height (amplitude)
of h2 and a waveform pitch of w1 due to the unevenness alternately arranged along the radial
direction of the damper.
On the other hand, in the corrugation shape in the inter-axis direction region S2 shown in FIG.
8C, the waveform pitch remains w1, but the height (amplitude) of the waveform is changed to h1,
h1 <H2 is set.
When the height h1 of the concavities and convexities in the inter-axial direction region S2 is
suppressed small, the amount of extension at the time of pressure molding is reduced, and the
deformation of the lattice of the yarns 31 and 32 constituting the woven fabric 30 is suppressed.
As a result, in any of the axial area S1 and the interaxial area S2, the formation of the corrugation
shape is completed while the lattices by the yarns 31 and 32 are substantially equivalent, and the
axial area S1 of the molded article and the interaxial area It is possible to almost eliminate
mechanical property differences such as elongation and strength from S2.
[0033]
That is, in the third embodiment, in order to make the molding conditions of the dies 41 and 42
different between the axial region S1 and the interaxial direction region S2, the ring-shaped
irregularities forming the corrugation shape are in the axial direction. The heights h1 and h2 of
the unevenness are made different between the area S1 and the inter-axis direction area S2, and
mechanical such as extension or strength between the axial area S1 and the inter-axis direction
area S2 of the molded product The characteristic difference is reduced.
[0034]
The corrugation shape in the inter-axis direction region S2 shown in FIG. 8 (d) remains the height
(amplitude) of the unevenness at h2 with respect to the corrugation shape of the axial region S1
shown in FIG. 8 (b) However, the pitch of the asperities is changed to w2, and is set to w1 <w2.
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When the pitch of the concavities and convexities in the inter-axial direction region S2 is
suppressed small, the amount of extension at the time of pressure molding is enlarged, the
deformation of the lattices of the yarns 31 and 32 constituting the woven fabric 30 increases,
and the strength is also improved. Do. As a result, in any of the axial area S1 and the interaxial
area S2, the formation of the corrugation shape is completed while the strength by the yarns 31
and 32 is substantially equal, and the axial area S1 of the molded article and the interaxial area
S2 And mechanical characteristics such as elongation and strength between them can be almost
eliminated.
[0035]
That is, in the fourth embodiment shown in FIG. 8D, in order to make the molding conditions by
the dies 41 and 42 different between the axial region S1 and the interaxial direction region S2, a
ring for forming a corrugation shape is formed. The unevenness of the shape makes the pitch of
the unevenness different between the axial area S1 and the interaxial area S2, and the machine
such as the extension or strength between the axial area S1 and the interaxial area S2 of the
molded product Characteristic differences are reduced.
[0036]
FIG. 9 is an explanatory view of a speaker damper according to the fifth and sixth embodiments
of the present invention.
In the speaker damper according to the fifth embodiment of the present invention, in order to
make molding conditions by the dies 41 and 42 different between the axial region S1 and the
interaxial direction region S2, the interaxial direction region S2 is In addition to the ring-shaped
irregularities having a corrugation shape, reinforcing ribs 46 extending in the radial direction are
formed to extend or strength the axial area S1 of the molded article 47 and the inter-axial area
S2. The mechanical characteristic difference is reduced. In the speaker damper of the sixth
embodiment of the present invention, in order to make the molding conditions by the dies 41
and 42 different between the axial region S1 and the interaxial direction region S2, the interaxial
direction region S2 is In addition to the ring-shaped irregularities in the corrugation shape,
reinforcing ribs 48 extending in the radial direction are formed to extend or strength the axial
region S1 of the molded article 47 and the axial region S2. The mechanical characteristic
difference is reduced.
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[0037]
The reinforcing ribs 46 and 48 have different radial extension lengths. The respective reinforcing
ribs 46 and 48 are provided to be orthogonal to the ring-shaped concavities and convexities in
the corrugation shape, and in order to improve the rigidity at the time of amplitude propagation
in the inter-axial direction region S2, these reinforcing ribs 46, By appropriately adjusting the
amount of equipment of 48, it is possible to eliminate the mechanical characteristic difference
such as the extension or the strength between the axial region S1 and the interaxial direction
region S2.
[0038]
FIG. 10 is an explanatory view of a speaker damper according to a seventh embodiment of the
present invention, in which (a) is a cross-sectional view of the corrugation structure in the axial
region and (b) is a cross-sectional view of the corrugation structure in the interaxial region It is.
In the speaker damper of the present embodiment, the axial region S1 and the interaxial region
S2 are different from each other in order to make the molding conditions of the dies 41 and 42
different between the axial region S1 and the interaxial region S2. In this case, the corrugated
irregularities having the corrugation shape are formed into the form upside down, and
mechanical characteristics differences such as the extension and strength between the axial
region S1 and the interaxial region S2 of the molded product Is reduced.
[0039]
In each of the above embodiments, it is assumed that the woven fabric used as a raw material of
the speaker damper is a biaxial weave (plain weave) in which two yarns 31 and 32 in length and
width are woven. The woven fabric is not limited to this. For example, a triaxial woven fabric in
which three yarns are woven at an angle of about 60 degrees each other, or a four-axis woven
fabric in which four yarns are woven at an angle of about 45 degrees each other It is usable.
[0040]
In addition, the configuration for making the molding condition by the male and female mold
differ between the axial area and the interaxial area of the woven fabric of the present invention
is only applied independently as shown in each of the above-mentioned respective embodiments.
It is also possible to apply a combination of a plurality of configurations, thereby further
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12
eliminating mechanical property differences such as extension and strength between the axial
region S1 and the interaxial direction region S2. .
[0041]
As described above, the speaker damper according to the embodiment of the present invention
has a corrugation shape in which asperities are alternately arranged in the radial direction by
sandwiching the resin-impregnated woven fabric 30 between the molds 41 and 42. A speaker
damper having an axially extending area S1 extending in the axial direction of the mutually
intersecting yarns 31 and 32 of the woven fabric 30, and an inter-axial area S2 extending
between the respective axial directions The molding conditions of the molds 41 and 42 are
different.
Thereby, the mechanical characteristic difference such as the extension and the strength between
the axial region S1 and the interaxial direction region S2 of the molded product is reduced. In
addition, when the amplitude of the voice coil bobbin 11 propagates in the state of being
incorporated in the speaker unit 61, a difference occurs in the displacement of the corrugation
between the axial direction of the yarns 31 and 32 and the interaxial direction inclined 45 °
from the axial direction. Can be prevented, and the occurrence of rolling that hinders the smooth
movement of the voice coil bobbin 11 can be prevented. As a result, in the speaker unit 61, it is
possible to prevent the occurrence of rolling that distorts the sound and to improve the sound
quality and the acoustic characteristics.
[0042]
It is a longitudinal cross-sectional view which shows the structure of the conventional speaker
unit. It is explanatory drawing of the process of forming the corrugation shape of the damper for
speakers shown in FIG. 1 in a woven fabric. It is explanatory drawing of the weave structure of
the woven fabric of the damper for speaker units used for the speaker unit shown in FIG. It is a
top view of the damper for speakers shown in FIG. It is a longitudinal cross-sectional view which
shows the structure of the speaker unit using the damper for speakers of the 1st Embodiment of
this invention. It is explanatory drawing of the manufacturing process of the damper for speakers
shown in FIG. It is explanatory drawing of the process of forming the corrugation shape of the
damper for speakers of 2nd Embodiment of this invention in a woven fabric. It is explanatory
drawing of the damper for speakers of the 3rd and 4th embodiment of this invention, (a) is
explanatory drawing of the axial direction area | region on a damper, and the axial direction area
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| region, (b) is the 3rd of this invention (C) is a cross-sectional view of a corrugation structure in
an axial direction region in a speaker damper according to a third embodiment of the present
invention, (d) ) Is a cross-sectional view of a corrugation structure in an axial direction region in a
speaker damper according to a fourth embodiment of the present invention. It is explanatory
drawing of the damper for speakers of the 5th and 6th embodiment of this invention. It is
explanatory drawing of the damper for speakers of 7th Embodiment of this invention, (a) is
sectional drawing of the corrugation structure in an axial direction area | region, (b) is sectional
drawing of the corrugation structure in an axial direction area | region.
Explanation of sign
[0043]
Reference Signs List 30 woven fabric 31, 32 yarn (fiber) 40 damper (damper for speaker unit)
41, 42 mold 41a mold for axial area 41b mold for axial area 61 speaker unit C1, C2 between
molds Clearance h1, h2 Corrugation height S1 axial area S2 interaxis direction area w1, w2
Corrugation height unevenness pitch
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