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JP2011211639

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DESCRIPTION JP2011211639
An object of the present invention is to provide a method of manufacturing an acoustic
diaphragm capable of improving durability by preventing peeling of a bonding interface between
a diaphragm portion and an edge portion. In a method of manufacturing an acoustic diaphragm
1 including a diaphragm portion 2 that vibrates in response to an electric signal or a sound wave,
and an edge portion 3 provided around the outer periphery of the diaphragm portion 2 to
support the diaphragm portion 2 An inner joint cylindrical portion 20 circumferentially provided
along the outer edge of the vibrating portion 21 of the diaphragm portion 2 protrudes from the
outer peripheral portion of the diaphragm portion 2, and an inner joint cylindrical portion is
formed on the inner peripheral portion of the edge portion 3. An outer joint cylindrical portion
30 circumferentially provided on the outer periphery of 20 is provided so as to project the inner
peripheral surface of the outer joint cylindrical portion 30 and the outer peripheral surface of the
inner joint cylindrical portion 20. [Selected figure] Figure 1
Method of manufacturing acoustic diaphragm
[0001]
The present invention relates to a method of manufacturing an acoustic diaphragm attached to a
speaker or a microphone.
[0002]
Conventionally, as a diaphragm for a speaker, for example, a circular diaphragm portion that
vibrates in response to an electric signal as described in Patent Document 1 below and a
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diaphragm portion provided so as to surround the periphery of the diaphragm portion A
configuration having an annular edge portion is known.
In the above-mentioned edge portion, there are provided a roll portion which is expanded toward
the outer side of the speaker and extends along the circumferential direction, an inner flange
which protrudes inward from an inner edge of the roll portion, and a roll portion And an outer
flange projecting outward from the outer edge of the frame. Moreover, the above-mentioned
diaphragm part is formed in the taper shape gradually diameter-expanded toward the speaker
outer side (side from which a sound wave is discharge | released). As a method of manufacturing
the diaphragm having the above-described configuration, the diaphragm is formed by
overlapping and bonding the outer peripheral portion of the diaphragm portion to the inner
flange of the edge portion.
[0003]
JP 2007-325221 A
[0004]
However, in the above-described conventional method for manufacturing an acoustic diaphragm,
stress is concentrated at the bonding interface between the diaphragm and the edge when the
diaphragm is displaced, and the stress is concentrated at one point, so the maximum stress tends
to be large. .
Therefore, the bonding interface between the diaphragm portion and the edge portion is easily
peeled off, and there is room for improvement in durability.
[0005]
The present invention takes the above-described conventional problems into consideration, and
provides a method of manufacturing an acoustic diaphragm capable of improving the durability
by preventing the peeling of the bonding interface between the diaphragm portion and the edge
portion. The purpose is that.
[0006]
A method of manufacturing an acoustic diaphragm according to the present invention includes
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the following: a diaphragm portion that vibrates in response to an electric signal or a sound
wave, and an edge portion circumferentially provided on the outer periphery of the diaphragm
portion to support the diaphragm portion In the method of manufacturing the diaphragm, an
inner joint cylindrical portion provided along the outer edge of the vibrating portion of the
diaphragm portion is provided to protrude on the outer peripheral portion of the diaphragm
portion, and the inner peripheral portion of the edge portion is An outer joint cylindrical portion
is provided protruding around the outer periphery of the inner joint cylindrical portion, and the
inner peripheral surface of the outer joint cylindrical portion and the outer peripheral surface of
the inner joint cylindrical portion are jointed. .
[0007]
With such a feature, the portion where stress concentrates at the time of displacement of the
diaphragm portion is located away from the bonding interface between the inner peripheral
surface of the outer joint cylindrical portion and the outer peripheral surface of the inner joint
cylindrical portion and acts on the joint interface Stress is reduced.
Moreover, since the stress concentration portion is dispersed in a relatively wide range, the
maximum stress in the stress concentration portion is reduced.
Furthermore, since the inner peripheral surface of the outer joint cylindrical portion and the
outer peripheral surface of the inner joint cylindrical portion are joined, a large joint area is
secured.
[0008]
Further, the method of manufacturing the acoustic diaphragm according to the present invention
is formed by two-color molding including a primary molding step of molding the diaphragm
portion and a secondary molding step of molding the edge portion, and the two-color molding It
is preferable to join the inner peripheral surface of the outer joint cylindrical portion and the
outer peripheral surface of the inner joint cylindrical portion by molding. As a result, the inner
peripheral surface of the outer jointed cylindrical portion and the outer peripheral surface of the
inner jointed cylindrical portion are reliably joined with a small number of steps.
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[0009]
Further, in the method of manufacturing the acoustic diaphragm according to the present
invention, preferably, the inner joint cylindrical portion protrudes toward the core mold in the
two-color molding. As a result, the inner peripheral surface of the inner joint cylindrical portion
of the diaphragm portion is formed by the core mold, and the inner peripheral surface of the
inner joint cylindrical portion is bonded to the core mold. Therefore, at the time of mold opening
in primary molding in two-color molding, the diaphragm portion is firmly held by the core mold
and easily released from the cavity mold.
[0010]
Further, in the method of manufacturing the acoustic diaphragm according to the present
invention, it is preferable that the outer joint cylindrical portion is protruded toward the cavity
mold side in the two-color molding. As a result, there is no need to project thin-walled cores to be
inserted into the molding space of the outer jointing cylinder in the cavity mold at the time of
primary molding in two-color molding, so it is easy to ensure molding accuracy and fear of core
breakage Is also mitigated.
[0011]
According to the method of manufacturing an acoustic diaphragm according to the present
invention, the stress concentration portion at the time of displacement of the diaphragm portion
is located away from the bonding interface between the diaphragm portion and the edge portion
and the maximum stress in the stress concentration portion is small. Further, since a large
bonding area between the diaphragm and the edge is secured, peeling of the bonding interface
between the diaphragm and the edge can be prevented, and the durability of the acoustic
diaphragm can be improved. it can.
[0012]
FIG. 2 is a cross-sectional view of the acoustic diaphragm for describing the embodiment of the
present invention.
It is a fragmentary sectional view of the diaphragm for acoustics for describing embodiment of
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this invention. It is sectional drawing which showed the manufacturing process of the diaphragm
for acoustics for describing embodiment of this invention. It is sectional drawing which showed
the manufacturing process of the diaphragm for acoustics for describing embodiment of this
invention. It is a fragmentary sectional view of the diaphragm for sound for demonstrating the
modification of this invention.
[0013]
Hereinafter, an embodiment of a method of manufacturing an acoustic diaphragm according to
the present invention will be described based on the drawings. The acoustic diaphragm 1 shown
in FIG. 1 is a diaphragm for a speaker that converts an electric signal into a sound wave, and is a
member that receives the electric signal and emits a sound wave toward the outside of the
speaker. The upper side in FIG. 1 is the surface side of the acoustic diaphragm 1, that is, the
outer side of the speaker, and the lower side in FIG. 1 is the back side of the acoustic diaphragm
1, that is, the inner side of the speaker. Hereinafter, the speaker outer side is referred to as
“upper side”, and the speaker inner side is referred to as “lower side”. Moreover, the
dashed-dotted line O shown in FIG. 1 has shown the central axis line of the diaphragm part 2
mentioned later and the edge part 3, and it only describes it as the "axis line O" hereafter.
Further, a direction along the axis O is referred to as “axial direction”, a direction orthogonal to
the axis O is referred to as “radial direction”, and a direction around the axis O is referred to as
“circumferential direction”.
[0014]
First, the configuration of the acoustic diaphragm 1 will be described. As shown in FIGS. 1 and 2,
the acoustic diaphragm 1 is a member fitted and mounted on the inside of the frame 10. As a
schematic configuration of the acoustic diaphragm 1, an electrical signal is received. It comprises
a vibrating diaphragm portion 2, an edge portion 3 provided on the outer periphery of the
diaphragm portion 2 to support the diaphragm portion 2, and a gasket portion 4 disposed on the
outer peripheral portion of the edge portion 3. ing. The acoustic diaphragm 1 is integrally formed
by two-color molding in which the diaphragm portion 2 and the gasket portion 4 are used as a
primary molding and the edge portion 3 is used as a secondary molding.
[0015]
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The diaphragm portion 2 is a partition portion having a substantially circular shape in plan view
and made of a synthetic resin, and an inner joint cylindrical portion 20 extending in the axial
direction is provided in a projecting manner on an outer peripheral portion of the diaphragm
portion 2. Explaining in detail, the diaphragm portion 2 has a plate-like vibrating portion 21
which bulges upward in a dome shape (spherical shape), and a core mold 51 in two-color
molding described above from the outer edge of the vibrating portion 21 (FIG. 3, shown in FIG.
And an inner joint tube 20 projecting toward the upper side. The inner joint cylindrical portion
20 is a substantially cylindrical cylindrical portion provided along the entire periphery along the
outer edge of the vibrating portion 21, and the height H of the inner joint cylindrical portion 20
is the thickness of the vibrating portion 21. It is 2 to 20 times (2d to 20d) of d. Further, on the
upper surface of the vibrating portion 21, a plurality of convex ribs (not shown) extending
radially from a central portion of the vibrating portion 21 in a plan view are formed.
[0016]
The edge portion 3 is a ring portion having a substantially annular shape in a plan view and
provided around the entire circumference along the outer peripheral surface (inner joint
cylindrical portion 20) of the diaphragm portion 2. The outer joint cylindrical portion 30
extending in the axial direction is provided in a protruding manner. Specifically, the edge portion
3 is made of a soft synthetic resin that is more easily deformed than the diaphragm portion 2
described above, and the edge portion 3 includes the roll portion 31 having a curved shape in the
longitudinal cross sectional view and the inner joint cylinder described above An outer joint
cylindrical portion 30 provided around the outer periphery of the portion 20 and a support
portion 32 for supporting the gasket portion 4 are provided.
[0017]
The roll portion 31 is a bulging portion having a substantially inverted U-shape in a longitudinal
sectional view and bulging toward the upper side in the axial direction, and is extended over the
entire circumferential direction and formed in a generally annular shape in plan view . The inner
peripheral portion of the roll portion 31 is raised from the outer peripheral surface of the upper
end portion of the outer joint cylindrical portion 30, and the inner edge of the roll portion 31 is
the joint interface between the inner joint cylindrical portion 20 and the outer joint cylindrical
portion 30. It is located radially outward of S. The outer peripheral portion of the roll portion 31
is raised from the inner peripheral surface of the upper end portion of the cylindrical portion 33
of the support portion 32 described later.
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[0018]
The outer joint cylindrical portion 30 is a cylindrical portion having a substantially cylindrical
shape, and is provided along the entire outer peripheral surface of the inner joint cylindrical
portion 20 described above. Further, the outer joint cylindrical portion 30 is a cavity mold 61, 62
(shown in FIGS. 3 and 4) in the above-described two-color molding from the inner edge of the roll
portion 31. ) Is projected toward the side, that is, downward. The upper and lower end surfaces
of the outer joint cylindrical portion 30 are formed flush with the upper and lower end surfaces
of the inner joint cylindrical portion 20, respectively. That is, the height H of the outer joint
cylindrical portion 30 is twice to 20 times (2 d to 20 d) the thickness d of the vibrating portion
21. Further, the inner peripheral surface of the outer jointed cylindrical portion 30 is joined (for
example, heat-fused) to the outer peripheral surface of the inner jointed cylindrical portion 20 by
the two-color molding described above, whereby the diaphragm portion 2 and the edge portion 3
are formed. And are integrated. The coil 11 is disposed below the inner joint cylindrical portion
20 and the outer joint cylindrical portion 30.
[0019]
The support portion 32 is a plate portion bent along the inner peripheral surface and the lower
end surface of the gasket portion 4 into a substantially L shape in a longitudinal sectional view,
and is extended along the entire outer edge of the roll portion 31 It is formed in an annular
shape in plan view. The support portion 32 is provided with a cylindrical tubular portion 33
projecting downward from the outer edge of the roll portion 31 and a flange portion 34
projecting radially outward from the lower end of the tubular portion 33. . The cylindrical
portion 33 is formed along the inner peripheral surface of the lower portion of the gasket portion
4, and the flange portion 34 is formed along the lower end surface of the gasket portion 4.
[0020]
The gasket portion 4 is a cylindrical ring body fitted to the inside of the frame 10. The gasket
portion 4 is made of the same synthetic resin as the diaphragm portion 2 and is formed by
molding simultaneously with the diaphragm portion 2. Further, the inner peripheral surface of
the lower portion of the gasket portion 4 is joined (for example, heat-sealed) to the outer
peripheral surface of the cylindrical portion 33 of the support portion 32 described above by
two-color molding described above Is bonded (for example, heat-sealed) to the upper surface of
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the flange portion 34 of the support portion 32 described above, whereby the gasket portion 4
and the edge portion 3 are integrated.
[0021]
Next, a method of manufacturing the acoustic diaphragm 1 configured as described above will be
described.
[0022]
First, as shown in FIG. 3, a primary forming step of forming the diaphragm portion 2 and the
gasket portion 4 which are primary molded products by the core mold 51 and the primary cavity
mold 61 is performed.
[0023]
More specifically, as shown in FIG. 3A, after the core mold 51 fixed to the movable side mold
plate 50 is made to face the primary cavity mold 61 fixed to the fixed side mold plate 60, The
movable mold plate 50 is advanced (lowered) toward the fixed mold plate 60 to perform a mold
closing process for bringing the mating surfaces of the primary cavity mold 61 and the core mold
51 into close contact with each other.
Thus, a molding space for molding the diaphragm 2 and the gasket 4 is formed between the core
mold 51 and the primary cavity mold 61.
[0024]
Subsequently, as shown in FIG. 3B, a fluid resin material is injected from the gate 64 penetrating
from the fixed side mold plate 60 to the molding surface of the primary cavity mold 61, and the
resin is injected into the molding space described above. Perform an injection process to fill the
material.
Thereby, the diaphragm part 2 and the gasket part 4 which are primary moldings are each shape
| molded. By the way, the outer joint cylindrical portion 30 of the edge portion 3 (shown in FIG.
4). Since it has a shape projecting toward the primary cavity mold 61 side, there is no need to
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project a thin core on the primary cavity mold 61, and the primary cavity mold 61 has a thick
core. 61a is provided in a protruding manner. As a result, the core 61a is less likely to be
deformed or damaged during the mold closing process or the injection process described above.
[0025]
Subsequently, as shown in FIG. 3C, after the resin of the diaphragm portion 2 and the gasket
portion 4 is cured, the movable side mold plate 50 is retracted (raised) in the direction away
from the fixed side mold plate 60. Then, a mold opening process of separating the primary cavity
mold 61 and the core mold 51 is performed. At this time, the diaphragm part 2 and the gasket
part 4 which are primary molded products are held by the core mold 51 and move together with
the core mold 51. Thereby, the primary cavity mold 61 is released from the diaphragm portion 2
and the gasket portion 4. At this time, since the inner joint cylindrical portion 20 of the
diaphragm portion 2 protrudes toward the core mold 51 and the inner peripheral surface of the
inner joint cylindrical portion 20 is joined to the core mold 51, the diaphragm portion 2 is
formed. Is firmly held by the core mold 51 and easily released from the primary cavity mold 61.
[0026]
Next, as shown in FIG. 4, a secondary forming step of forming the edge portion 3 which is a
secondary formed product by the core mold 51 and the secondary cavity mold 62 is performed.
[0027]
Specifically, as shown in FIG. 4A, after the core mold 51 fixed to the movable side mold plate 50
is opposed to the secondary cavity mold 62 fixed to the fixed side mold plate 60, The movable
mold plate 50 is advanced (lowered) toward the fixed mold plate 60 to perform a mold closing
process for bringing the mating surfaces of the secondary cavity mold 62 and the core mold 51
into close contact with each other.
As a result, a molding space for molding the edge portion 3 is formed between the core mold 51
and the secondary cavity mold 62, and the diaphragm 2 and the gasket 4 held by the core mold
51 described above. Is caught.
[0028]
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Subsequently, as shown in FIG. 4B, the resin material having fluidity is injected from the gate 63
penetrating from the fixed side mold plate 60 to the molding surface of the secondary cavity
mold 62, and the resin material is injected into the molding space. An injection process is
performed to fill the resin material. Thereby, the edge part 3 which is a secondary molding is
shape | molded. At this time, for example, due to the heat of the above-described resin material,
the outer peripheral surface of the inner joint cylindrical portion 20 of the diaphragm portion 2
and the inner peripheral surface and lower end surface of the lower portion of the gasket portion
4 respectively melt. As a result, the inner peripheral surface of the outer joint cylindrical portion
30 of the edge portion 3 is fused to the outer peripheral surface of the inner joint cylindrical
portion 20 of the diaphragm portion 2, and the outer peripheral surface of the cylindrical portion
33 of the edge portion 3 and the flange portion 34 The upper surface is fused to the inner
peripheral surface and the lower end surface of the lower part of the gasket part 4, and the edge
part 3 is integrated with the diaphragm part 2 and the gasket part 4 to form the acoustic
diaphragm 1.
[0029]
Subsequently, as shown in FIG. 4C, after the resin of the above-described edge portion 3 is cured,
the movable side mold plate 50 is retracted (raised) in a direction away from the fixed side mold
plate 60 to form a secondary cavity. A mold opening process for separating the mold 62 and the
core mold 51 is performed. At this time, the acoustic diaphragm 1 is held by the core mold 51
and moves together with the core mold 51. As a result, the secondary cavity mold 62 is released
from the acoustic diaphragm 1. Further, after the acoustic diaphragm 1 is released from the
secondary cavity mold 62, the acoustic diaphragm 1 is ejected by an ejector pin (not shown)
provided on the movable side template 50. As a result, the acoustic diaphragm 1 is released from
the core mold 51. Thus, the manufacturing process of the acoustic diaphragm 1 is completed.
[0030]
According to the above-described method of manufacturing the acoustic diaphragm 1, the stress
concentrated portion at the time of displacement of the diaphragm portion 2 becomes the inner
edge portion (A portion shown in FIG. 2) of the roll portion 31 of the edge portion 3 The stress
acting on the bonding interface S is reduced by about 90% as compared with the prior art at a
position away from the bonding interface S between the inner peripheral surface of 30 and the
outer peripheral surface of the inner bonding cylindrical portion 20. Moreover, since the stress
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concentration portion is dispersed in a relatively wide range, the maximum stress in the stress
concentration portion is reduced by about 50% compared to the conventional case. Furthermore,
since the inner circumferential surface of the outer joint cylindrical portion 30 and the outer
circumferential surface of the inner joint cylindrical portion 20 are joined, a large joint area is
secured. Therefore, peeling of the bonding interface S between the diaphragm portion 2 and the
edge portion 3 can be prevented, and the durability of the acoustic diaphragm 1 can be
improved.
[0031]
Also, after the diaphragm portion 2 and the gasket portion 4 are formed by primary molding, the
acoustic diaphragm 1 is formed by two-color molding in which the edge portion 3 is formed by
secondary molding, and the outer peripheral surface of the inner joint cylindrical portion 20 And
the inner peripheral surface of the outer jointed cylindrical portion 30 are joined by two-color
molding, the inner peripheral surface of the outer jointed cylindrical portion 30 and the outer
peripheral surface of the inner jointed cylindrical portion 20 are reliably joined in a small
number of steps. . Therefore, the durability of the acoustic diaphragm 1 can be improved, and the
productivity of the acoustic diaphragm 1 can be improved.
[0032]
In addition, since the inner joint cylindrical portion 20 protrudes toward the core mold 51 side,
the diaphragm portion 2 is firmly held by the core mold 51 during the mold opening process in
the primary molding, and the primary cavity gold is formed. Since the mold is easily released
from the mold 61, it is possible to prevent the problem that the diaphragm portion 2 is detached
from the core mold 51 at the time of the mold opening process of the primary molding.
[0033]
Moreover, since the core 61a having a large thickness is protruded from the primary cavity mold
61 by the outer joint cylindrical part 30 protruding toward the primary cavity mold 61 side, the
mold closing process in the primary molding is performed. It is difficult for the core 61a to be
deformed or damaged at the time or the injection process, the forming accuracy of the inner joint
cylindrical portion 20 and the outer joint cylindrical portion 30 can be improved, and the quality
of the acoustic diaphragm 1 is improved. Can.
[0034]
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Further, the inner peripheral portion of the roll portion 31 is raised from the outer peripheral
surface of the upper end portion of the outer joint cylindrical portion 30, and the inner edge of
the roll portion 31 joins the inner joint cylindrical portion 20 and the outer joint cylindrical
portion 30. Since it is located radially outside the interface S, the stress concentration portion at
the time of displacement of the diaphragm portion 2 is at a position that is reliably separated
from the bonding interface S.
Thereby, peeling of the bonding interface S between the diaphragm portion 2 and the edge
portion 3 can be reliably prevented.
[0035]
As mentioned above, although the embodiment of the manufacturing method of the diaphragm
for sounds concerning the present invention was described, the present invention is not limited
to the above-mentioned embodiment, and can be suitably changed in the range which does not
deviate from the meaning. .
For example, in the above-described embodiment, the outer joint cylindrical portion 30 of the
edge portion 3 protrudes downward (toward the cavity mold 61), but as shown in FIG. The outer
joint cylindrical portion 103 of 103 may be protruded toward the core mold 51 side (upper side
in FIG. 5).
[0036]
Further, in the above-described embodiment, the support portion 32 of the edge portion 3 is
formed in a shape bent in a substantially L shape in a longitudinal sectional view, but according
to the present invention, as shown in FIG. It may be a flat support portion 132 protruding
radially outward from the outer edge of the roll portion 131.
[0037]
Further, in the above-described embodiment, the inner peripheral portion of the roll portion 31 is
directly raised from the outer peripheral surface of the outer joint cylindrical portion 30 of the
edge portion 3. However, according to the present invention, as shown in FIG. The connecting
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portion 135 may be interposed between the outer peripheral surface of the outer joint cylindrical
portion 130 of the portion 103 and the inner edge of the roll portion 131.
Thereby, the distance between the stress concentration portion and the joint interface S between
the inner joint cylindrical portion 20 and the outer joint cylindrical portion 30 at the time of
displacement of the diaphragm portion 2 becomes longer, and the stress acting on the joint
interface S is reduced smaller. As a result, peeling of the bonding interface S can be reliably
prevented.
[0038]
Further, in the embodiment described above, the diaphragm portion 2 is formed in a circular
shape in a plan view, and the vibrating portion 21 of the diaphragm portion 2 is formed in a
spherical shape which bulges upward (outside of the speaker) However, in the present invention,
the shape of the diaphragm portion can be appropriately changed, and may be, for example, a
diaphragm portion having an elliptical shape, a rectangular shape, or another shape in plan view,
or a diaphragm portion having a planar vibrating portion or The diaphragm portion may have a
tapered cylindrical vibration portion whose diameter is gradually increased toward the upper
side (the outer side of the speaker).
[0039]
Further, in the above embodiment, the roll portion 31 of the edge portion 3 is bulged upward
(outside the speaker), but in the present invention, the roll portion 31 is on the lower side (inside
of the speaker) It may be bulging toward the
Furthermore, according to the present invention, the edge portion without the roll portion 31
may be used, and the shape of the edge portion can be appropriately changed.
[0040]
Moreover, although the above-mentioned embodiment demonstrates the diaphragm 1 for
acoustics in which the gasket part 4 was integrally formed, it can also be set as the diaphragm
for acoustics which the gasket part 4 was abbreviate | omitted in this invention It is. For example,
the gasket may be a separate part.
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[0041]
In the above embodiment, the inner joint cylindrical portion 20 of the diaphragm portion 2
protrudes toward the core mold 51 side, but in the present invention, the inner joint cylindrical
portion of the diaphragm portion 2 is on the cavity mold side It is also possible to make it the
composition which projected to.
[0042]
In the above embodiment, the diaphragm 2 and the gasket 4 are formed by primary molding, and
the edge 3 is formed by secondary molding. The acoustic diaphragm 1 is formed by two-color
molding. The acoustic diaphragm in the invention may be formed by another method, for
example, the edge portion may be formed by primary molding, and the diaphragm portion may
be formed by secondary molding.
Furthermore, in the present invention, the acoustic diaphragm can be formed by methods other
than two-color molding, for example, can be formed by insert molding, or the diaphragm portion
and the edge portion are separately provided. After molding, the inner joint cylinder and the
outer joint cylinder may be bonded with an adhesive to form an acoustic diaphragm.
[0043]
Further, although the above embodiment describes the acoustic diaphragm 1 for a speaker that
converts an electric signal into a sound wave, the present invention relates to a microphone for
receiving a sound wave and vibrating it to convert it into an electric signal. It may be a
diaphragm.
[0044]
In addition, it is possible to replace the component in the above-mentioned embodiment with a
well-known component suitably, in the range which does not deviate from the main point of the
present invention, and may combine the above-mentioned modification suitably.
[0045]
Reference Signs List 1 acoustic diaphragm 2 diaphragm portion 3, 103 edge portion 20 inner
joint cylinder 30, 130 outer joint cylinder 51 core mold 61 primary cavity mold (cavity mold) 62
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secondary cavity mold (cavity mold)
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