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JP2012134629

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2012134629
An object of the present invention is to efficiently manufacture, by injection molding, a high
quality acoustic member capable of suppressing resonance in a rolling mode and maintaining
good sound quality characteristics. A method of manufacturing an acoustic member (1)
comprising: a diaphragm (2) vibrating due to vibration generated at a vibration generating
portion (C); and an edge (3) surrounding and supporting the diaphragm from the outside in the
radial direction A junction tube portion 10 in which the vibration generating portion is disposed
on one side sandwiching the diaphragm along the direction of the axis O, and the diaphragm is
joined to the radially inner end of the edge; and the junction tube portion And a plurality of
convex portions 13 bulging to the other side separated from the vibration generating portion
along the axial direction, and the joined cylindrical portion and the vibrator are provided. And an
entrance space S into which a part of the injection mold is inserted, and a two-color molding in
which the diaphragm is a primary molding and the edge is a secondary molding, or a diaphragm
is an insert. Provided is a method of manufacturing an acoustic member formed by insertmolding an edge as a product. [Selected figure] Figure 2
Method of manufacturing a member for sound
[0001]
The present invention relates to a method of manufacturing an acoustic member.
[0002]
As a member for acoustics, for example, a diaphragm joined to a bobbin around which a voice
coil is wound as described in Patent Document 1 below, and the diaphragm is surrounded from
the outer side in the radial direction and a frame for acoustics It is known to have a configuration
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comprising an annular gasket to be mounted, and an annular edge formed of a softer material
than a material joined to the diaphragm and the gasket to connect them and forming the
diaphragm and the gasket. ing.
[0003]
The edge portion has a roll portion which is curved in a dome shape in the axial direction of the
acoustic member and extends over the entire circumference, and an outer flange portion
provided protruding over the entire circumference from the roll portion. And an inner flange
portion protruding inward from the roll portion over the entire circumference.
And the said gasket is joined on the outer flange part.
The diaphragm is a member that radiates a sound wave by vibrating in the axial direction of the
acoustic member due to the vibration of the voice coil, and the outer peripheral edge portion
covers the entire inner flange portion of the edge portion. It is supported by being joined.
[0004]
JP 2007-325221 A
[0005]
By the way, in the acoustic member described in Patent Document 1, the diaphragm has a shape
projecting in the axial direction of the acoustic member, so the center of gravity of the diaphragm
supports the outer peripheral edge portion of the diaphragm. It will separate from the virtual
support surface (surface orthogonal to the axis line of the member for acoustics) enclosed by the
inner flange part to one side of an axial direction.
In particular, since the bobbin and the voice coil (vibration generating portion) are attached to
the diaphragm, the center of gravity of the vibration system combining the respective centers of
gravity of the diaphragm, bobbin and voice coil is one from the support surface in the axial
direction. It was separated by the side.
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[0006]
Therefore, while the diaphragm vibrates in the axial direction, the force to rotate around the
orthogonal axis orthogonal to the axial direction is likely to act on the diaphragm, thereby
causing the diaphragm to vibrate during the vibration. Resonance due to rolling was apt to occur.
As a result, the rolling mode resonance causes the bobbin or voice coil to hit the yoke to generate
abnormal noise, which may lower the sound quality.
[0007]
The present invention has been made in consideration of such circumstances, and an object
thereof is to efficiently manufacture a high quality acoustic member by injection molding which
can suppress resonance in a rolling mode and maintain good sound quality characteristics. It is
an object of the present invention to provide a method of manufacturing an acoustic member
that can be performed.
[0008]
In order to achieve the above object, the present invention provides the following means.
(1) In the method of manufacturing an acoustic member according to the present invention, a
vibration generating portion is attachable, and a diaphragm which vibrates due to the vibration
generated in the vibration generating portion, and the diaphragm outside in the radial direction A
method of manufacturing an acoustic member including an annular edge that is supported by
being surrounded by the vibration member, the vibration generating unit being disposed on one
side of the acoustic plate along the axial direction of the acoustic member. The vibration is
generated such that the diaphragm is joined to the radially inner end of the edge, and the outer
peripheral edge is continuously connected to the joint cylinder over the entire circumference to
close the opening of the joint cylinder. A body, and the vibrating body is formed with a plurality
of convex portions bulging to the other side away from the vibration generating portion along
the axial direction, and between the joining cylindrical portion and the vibrating body An
entrance space into which a part of the injection mold is inserted is defined, and the diaphragm is
a primary molded article And, and two-color molding of the edge and the secondary molded
article, or the features of the edge that is formed by insert molding the diaphragm as an insert
article.
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[0009]
According to the present invention, the diaphragm is supported by joining the joining cylindrical
portion provided continuously along the entire periphery to the outer peripheral edge portion of
the vibrating body to the radially inner end portion of the edge, thereby supporting the
diaphragm. A virtual surface formed on the inner side of the radially inner end portion so as to
be orthogonal to the axial direction functions as a support surface of the diaphragm. Here, the
vibrator continuously connected to the joint cylinder bulges on the other side in the axial
direction, that is, in the direction opposite to the side on which the vibration generating unit is
disposed (the direction away from the vibration generating unit). Since a plurality of protruding
portions are formed, the barycentric position of the diaphragm alone can be shifted to the
support surface side. Therefore, the combined center of gravity position of the diaphragm and
the vibration generating unit can be shifted to the virtual support surface side and approached.
Therefore, it is possible to suppress the occurrence of the resonance due to the rolling mode in
the diaphragm during vibration, and it is easy to prevent the deterioration of the sound quality
due to the reduction of the eigen value of the resonance frequency. Thereby, good sound quality
characteristics can be easily maintained, and a high quality acoustic member can be obtained.
[0010]
By the way, in manufacturing the member for sound, the edge is formed by injecting the molten
resin to the diaphragm as the primary molded product or the diaphragm as the insert product,
but the diaphragm is An entry space into which a part of the injection mold is inserted is formed
between the joint cylinder and the vibrator. Therefore, for example, the diaphragm can be held
firmly to one injection molding die at the time of primary molding opening during two-color
molding, and the release from the other injection molding die is easy. It can be done. Further, for
example, even at the time of insert molding, it is possible to firmly combine the diaphragm, which
is an insert, with the injection mold. Therefore, the acoustic member can be efficiently
manufactured by injection molding.
[0011]
(2) In the method of manufacturing an acoustic member according to the present invention, the
convex portion bulges in a fan shape extending from the central portion of the vibrating body to
the outer peripheral edge portion of the vibrating body, and A plurality of components may be
arranged radially around the axis of the acoustic member.
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[0012]
In this case, the convex portion is expanded in a fan-like shape over a wide range from the
central portion to the outer peripheral edge portion of the vibrating body, so it is easy to shift the
combined center of gravity of the diaphragm and the vibration generating portion toward the
support surface , It is easy to prevent the sound quality degradation more effectively.
Moreover, since the plurality of convex portions are arranged radially around the axis of the
acoustic member, the convex portions and the portion where the convex portions are not formed
are arranged in a well-balanced manner in the circumferential direction of the vibrator. As a
result, it is possible to prevent unevenness in the sound quality and to improve the sound quality
characteristics.
[0013]
(3) In the method of manufacturing an acoustic member according to the present invention, the
diaphragm is formed by injection molding, and the central portion of the vibrator is used as a
gate portion from which molten resin is injected during the injection molding. Also good.
[0014]
In this case, since there is no portion where the resin flow is bent at an acute angle when
injection molding the diaphragm, the molten resin can be uniformly flowed throughout the entire
cavity, and the diaphragm is formed high by injection molding. It can be formed with precision.
[0015]
(4) In the method of manufacturing an acoustic member according to the present invention, the
ridge line of the convex portion may extend linearly from the central portion of the vibrator to
the outer peripheral edge of the vibrator. good.
[0016]
In this case, the molten resin injected at the time of injection molding of the diaphragm can be
made to flow smoothly from the central portion side toward the outer peripheral portion side
with less resistance, and vibration is performed with higher accuracy while suppressing the short
mold. It can form a board.
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[0017]
According to the method of manufacturing an acoustic member according to the present
invention, resonance in a rolling mode can be suppressed, and a high quality acoustic member
having good sound quality characteristics can be efficiently manufactured by injection molding.
[0018]
It is a top view showing an embodiment of a member for sound concerning the present invention.
It is a longitudinal cross-sectional view along the AA of the member for sound shown in FIG.
It is a 1st process drawing which shows the manufacturing method of the member for acoustics
shown in FIG. 1, Comprising: It is a figure which shows the flow which shape | molds a
diaphragm and a gasket by injection molding.
It is a 2nd process drawing which shows the manufacturing method of the member for acoustics
shown in FIG. 1, and is a figure which shows the flow which shape | molds an edge by injection
molding after the state shown in FIG.
[0019]
Hereinafter, an embodiment of a member for sound concerning the present invention is
described with reference to drawings.
[0020]
(Member for sound) The member for sound 1 of this embodiment, as shown in FIG. 1 and FIG. 2,
has a diaphragm 2 to which a voice coil (vibration generating portion) C can be attached, and a
diameter of the diaphragm 2. And an annular edge 4 connected to the inside of the annular
gasket 3 attached to the acoustic device frame F while being surrounded and supported from the
outside of the direction; Is vibrated, and the vibration plate 2 vibrates due to the vibration to emit
a sound wave to the outside of the acoustic device.
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[0021]
In the present embodiment, the gasket 3 and the edge 4 are disposed coaxially with the common
axis.
Hereinafter, this common axis is referred to as an axis O, and along the axis O, the outer side of
the acoustic device is referred to as the upper side, and the inner side of the acoustic device is
referred to as the lower side.
Further, a direction orthogonal to the axis O is referred to as a radial direction, and a direction
around the axis O is referred to as a circumferential direction.
[0022]
The diaphragm 2 has a junction cylindrical portion 10 joined to an inner peripheral surface of an
inner cylindrical portion 21 described later provided at a radial inner end portion of the edge 4
and an outer peripheral edge of the junction cylindrical portion 10 all around A dome-shaped
vibrating body 11 is provided which is continuously provided and covers the opening of the joint
cylinder 10 and bulges upward, and is integrally formed of, for example, a synthetic resin
material such as polypropylene.
[0023]
The diaphragm 2 according to the present embodiment is supported by the joint cylindrical
portion 10 continuously provided along the entire periphery of the outer peripheral edge portion
of the vibrator 11 by being joined to the inner cylindrical portion 21 of the edge 4. A virtual
surface formed inside the inner cylindrical portion 21 so as to be orthogonal to the direction of
the axis O functions as a support surface P of the diaphragm 2.
The support surface P is located at a substantially middle portion in the vertical direction of the
inner cylindrical portion 21.
[0024]
The gasket 3 is formed of the same material as the material forming the diaphragm 2 so as to
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surround the edge 4 from the outer side in the radial direction.
[0025]
The edge 4 is an annular member which is joined to the diaphragm 2 and the gasket 3 to connect
them, and is rolled upward in an arc shape and extends around the entire circumference; An
inner cylindrical portion 21 coaxially arranged with the axis O at the inner side in the radial
direction, an outer cylindrical portion 22 coaxially arranged with the axis O at the outer side in
the radial direction than the roll portion 20 And a lower flange portion 23 provided on the lower
end of the portion 22 so as to project over the entire circumference toward the outer side in the
radial direction; It is integrally formed of a resin material softer than the material forming the.
[0026]
The lower end portion of the inner peripheral side portion of the roll portion 20 is connected to
the upper end of the inner cylindrical portion 21 through a flange-shaped first step portion 24
continuously extending over the entire circumference.
Further, the lower end portion of the outer peripheral side portion of the roll portion 20 is
connected to the upper end of the outer cylindrical portion 22 via a flange-like second step
portion 25 which extends continuously over the entire circumference.
Then, the inner peripheral surface of the inner cylindrical portion 21 of the edge 4 and the outer
peripheral surface of the joint cylindrical portion 10 of the diaphragm 2 are joined along the
entire circumference.
Further, the outer peripheral surface of the outer cylindrical portion 22 of the edge 4 and the
lower end portion of the inner peripheral surface of the gasket 3 are joined along the entire
periphery.
Further, the lower flange portion 23 of the edge 4 and the radially inner portion of the lower end
surface of the gasket 3 are joined over the entire circumference.
[0027]
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Further, in the present embodiment, a part of the lower flange portion 23 in the edge 4 is a gate
portion 26 from which the molten resin is injected at the time of injection molding of the edge 4.
The gate portion 26 is a mark of the gate 45 of the secondary cavity mold 42 described later,
which is formed, for example, at the time of injection molding of the edge 4. In the illustrated
example, the gate portion 26 is located at the outer peripheral edge of the lower flange portion
23.
[0028]
The diaphragm 2 will be described in detail. The vibrating body 11 is formed in a circular shape
in a plan view and disposed coaxially with the axis O, and can be vibrated in the direction of the
axis O by the vibration of the voice coil C. The junction tube 10 is formed in a cylindrical shape
and disposed coaxially with the axis O. At the lower end of the inner peripheral surface of the
joint cylindrical portion 10, a mounting cylindrical portion 12 extending downward from the
joint cylindrical portion 10 is continuously provided over the entire circumference. The
cylindrical portion 5 such as a bobbin around which the voice coil C is wound can be mounted on
the outer side of the mounting cylindrical portion 12. At this time, the cylindrical portion 5 is, for
example, externally fitted and fixed to the mounting cylindrical portion 12 in a state where the
upper end is in contact with the lower end of the joint cylindrical portion 10. That is, in the
present embodiment, the voice coil C is disposed on the lower side (one side) sandwiching the
diaphragm 2 along the direction of the axis O.
[0029]
By the way, in the vibrating body 11 of the present embodiment, a plurality of convex portions
13 bulging toward the upper side (the other side) in the direction of the axis O, which is a
direction from the voice coil C to the joining cylindrical portion 10, are formed. It is done. These
convex portions 13 expand in a generally fan-like shape in plan view extending from the vertex
portion (central portion) of the vibrating body 11 to the outer peripheral edge portion connected
to the joining cylindrical portion 10, and It is arranged in three places radially as the center. That
is, three convex portions 13 are formed at equal intervals in the circumferential direction of the
vibrating body 11, and the convex portions 13 and portions where the convex portions 13 are
not formed are arranged alternately in the circumferential direction. There is.
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[0030]
In addition, since the convex part 13 is formed in a planar view substantially fan shape as
mentioned above, the ridgeline (boundary line with the part in which the convex part 13 is not
formed) L extends over a vertex part to an outer peripheral part. It extends in a straight line.
Further, the outer peripheral edge portion of the convex portion 13 is continuously provided to
the upper end portion of the joint cylindrical portion 10. On the other hand, the outer peripheral
edge part of the part in which the convex part 13 is not formed is continuedly provided by the
lower end part of the joining cylinder part 10. As shown in FIG. Thereby, between the inner
circumferential surface of the joint cylinder 10 and the outer circumferential surface of the
vibrating body 11, an entry space S in which a part of the core (injection molding die) 31a of the
core mold 31 described later enters. It is made up.
[0031]
Further, the top portion of the vibrating body 11 is a gate portion 14 from which the molten
resin is injected at the time of injection molding of the diaphragm 2. The gate portion 14 is a
mark of the gate 43 of the primary cavity mold 41 described later, which is formed, for example,
at the time of injection molding of the diaphragm 2.
[0032]
(Manufacturing method) Next, the manufacturing method of member 1 for acoustics constituted
as mentioned above is explained. In the present embodiment, the diaphragm 2 and the gasket 3
are used as a primary molded product, and the edge 4 is used as a secondary molded product.
[0033]
First, based on FIG. 3, using the core mold 31 fixed to the movable side mold plate 30 and the
primary cavity mold 41 fixed to the fixed side mold plate 40, a diaphragm which is a primary
molded product The primary molding step of molding 2 and the gasket 3 will be described.
[0034]
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First, as shown in FIG. 3A, the movable side mold plate 30 is advanced toward the fixed side mold
plate 40 to perform mold clamping, and vibration is generated between the core mold 31 and the
primary cavity mold 41. The plate 2 and the gasket 3 form a primary cavity in which it is molded.
Next, as shown in FIG. 3B, the primary molded product is obtained by injecting and filling a
molten resin into the primary cavity from the two gates 43 and 44 opened to the cavity surface
of the primary cavity mold 41. The diaphragm 2 and the gasket 3 are formed.
[0035]
The diaphragm 2 is mainly formed by the molten resin injected from one of the gates 43, and the
gasket 3 is mainly formed by the molten resin injected from the other gate 44. In particular,
since one gate 43 is provided at a position corresponding to the top of the vibrator 11, the
molten resin injected from the gate 43 is likely to flow uniformly throughout the entire primary
cavity. .
[0036]
In the acoustic member 1, since the inner cylindrical portion 21 of the edge 4 protrudes
downward from the lower end of the inner peripheral side portion of the roll portion 20, the
primary cavity mold 41 is thin toward the core mold 31. It is sufficient to project only the thick
and rigid core 31a without projecting the core 41a.
[0037]
Next, as shown in FIG. 3C, the movable side mold plate 30 is retracted from the fixed side mold
plate 40 to perform mold opening.
At this time, the diaphragm 2 and the gasket 3 which are primary molded products are held by
the core mold 31 and separated from the inside of the primary cavity mold 41. When the
diaphragm 2 is removed from the primary cavity mold 41, the molten resin cured in the gate 43
is separated. The cut mark at this time becomes the mark of the gate, that is, the gate portion 14.
Further, since a part of the core 31 a of the core mold 31 is fitted into the entrance space S
defined between the joined cylindrical portion 10 of the formed diaphragm 2 and the vibrator
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11, While the diaphragm 2 is suppressed from dropping off from the core mold 31 at the time of
mold opening, the mold is smoothly released from the primary cavity mold 41.
[0038]
Next, based on FIG. 4, secondary molding for forming an edge 4 which is a secondary molded
product, using the core mold 31 and the secondary cavity mold 42 fixed to the fixed side mold
plate 40. The process will be described.
[0039]
First, as shown in FIG. 4A, after the core mold 31 is made to face the secondary cavity mold 42,
the movable side mold plate 30 is advanced toward the stationary side mold plate 40 to perform
mold clamping. .
Thus, a secondary cavity in which the edge 4 is formed is formed between the core mold 31 and
the secondary cavity mold 42, and the diaphragm 2 and the gasket 3 are disposed.
[0040]
Next, as shown in FIG. 4B, a secondary molded product is obtained by injecting and filling the
molten resin into the secondary cavity from the gate 45 opened to the cavity surface of the
secondary cavity mold 42. The edge 4 is formed and joined to the diaphragm 2 and the gasket 3.
Thus, the acoustic member 1 is formed.
[0041]
Next, as shown in FIG. 4C, the movable side mold plate 30 is retracted from the fixed side mold
plate 40 to perform mold opening. At this time, the acoustic member 1 is held by the core mold
31 and separated from the inside of the secondary cavity mold 42, and thereafter, is ejected by
an ejector pin (not shown) provided on the movable side mold plate 30, It is released from the
core mold 31.
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[0042]
As a result, the acoustic member 1 shown in FIGS. 1 and 2 can be obtained. Thus, the method of
manufacturing the acoustic member 1 is completed. When the acoustic member 1 is removed
from the secondary cavity mold 42, the molten resin cured in the gate 45 is separated. The cut
mark at this time becomes the mark of the gate, that is, the gate portion 26.
[0043]
According to the acoustic member 1 manufactured by the above-described manufacturing
method, as shown in FIGS. 1 and 2, the vibrator 11 is directed upward, that is, opposite to the
lower side where the voice coil C is disposed. Since the three convex portions 13 bulging toward
the side direction are formed, the barycentric position of the diaphragm 2 alone can be shifted to
the support surface P side. Therefore, the combined center-of-gravity position G of the
diaphragm 2 and the voice coil C can also be shifted toward the support surface P and
approached. Therefore, it is possible to suppress the occurrence of the resonance due to the
rolling mode in the diaphragm 2 during the vibration, and it is easy to prevent the deterioration
of the sound quality due to the decrease of the eigen value of the resonance frequency. Thereby,
good sound quality characteristics can be easily maintained, and a high quality acoustic member
1 can be obtained.
[0044]
Moreover, since the convex portion 13 of the present embodiment is fanned out in a fan shape
over a wide range from the top to the outer peripheral edge of the vibrating body 11, the
combined center of gravity position G of the diaphragm 2 and the voice coil C can be supported.
It is easier to shift to P, and it is easier to prevent the sound quality deterioration more
effectively. Moreover, since these three convex parts 13 are radially arranged centering on the
axis line O, the convex part 13 and the part in which the convex part 13 is not formed are
arrange | positioned with sufficient balance in the circumferential direction of the vibrating body
11 . As a result, it is possible to prevent unevenness in the sound quality and to improve the
sound quality characteristics.
[0045]
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Further, since the top of the vibrating body 11 is used as the gate portion 14 at the time of
injection molding, the entire molten resin injected from the gate 43 in the primary molding step
is in the entire primary cavity for molding the diaphragm 2. The diaphragm 2 can be formed
uniformly with high molding accuracy by injection molding. Moreover, since the ridge line L
extends linearly from the top to the outer peripheral edge of the vibrating body 11 in the convex
portion 13 of the present embodiment, the molten resin injected from the gate 43 is on the top
side. It can be made to flow smoothly with little resistance toward the outer peripheral edge side,
and the diaphragm 2 can be formed with higher accuracy while suppressing the short mold.
[0046]
In addition, as described above, when the mold is opened in the primary molding step, the core
mold 31 is in the entry space S defined between the joint cylindrical portion 10 of the molded
diaphragm 2 and the vibrator 11. Since a part of the element 31 a is fitted in and fitted, the
diaphragm 2 is prevented from dropping off from the core mold 31, and release from the
primary cavity mold 41 is easily performed. Therefore, the acoustic member 1 can be efficiently
manufactured by injection molding.
[0047]
The technical scope of the present invention is not limited to the above embodiment, and various
modifications can be made without departing from the scope of the present invention.
[0048]
For example, in the above embodiment, the acoustic member 1 is formed by two-color molding,
but instead of this, the diaphragm 2 and the gasket 3 are made as insert products, and the edge 4
is insert-molded for this. The member 1 may be manufactured.
Even when the diaphragm 2 is an insert product, the diaphragm 2 is used as a mold for injection
molding, utilizing the entry space S defined between the joint cylinder 10 and the vibrator 11.
Since it is possible to firmly combine them, the acoustic member 1 can also be efficiently
manufactured by injection molding.
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[0049]
Moreover, in the said embodiment, although the 1st step part 24 and the 2nd step part 25 were
provided in the edge 4, the roll part 20, the inner cylinder part 21, and the outer cylinder part 22
do not provide these both step parts 24 and 25. You may connect it directly to Moreover,
although the roll part 20 was provided in the edge 4, this roll part 20 is not essential and does
not need to provide it. In addition, when providing the roll part 20, you may make it expand
below.
[0050]
Moreover, although the gate part 26 in the edge 4 was located in the lower flange part 23, you
may change the position of this gate part 26 suitably. In addition, the inner cylindrical portion 21
of the edge 4 may project upward from the lower end of the inner peripheral side portion of the
roll portion 20.
[0051]
Further, in the above embodiment, the vibrating body 11 of the diaphragm 2 bulges upward and
is formed in a circular shape in a plan view, but it is not limited to this case, for example, an
elliptical shape or a polygonal shape in a plan view The shape may be other shapes, or may be
flat, or may be a shape that bulges downward. Moreover, although the three convex parts 13
were formed in the vibrating body 11, the number may be set freely. However, it is preferable to
arrange the convex portions radially about the axis O so that the convex portions and the
portions where the convex portions are not formed are alternately arranged in the
circumferential direction of the vibrating body 11. By doing this, since the balance of the
vibrating body 11 is well-balanced and it becomes difficult to make unevenness in the sound
quality, it is easy to improve the sound quality characteristics.
[0052]
C: voice coil (vibration generation part) L: ridge line O: axis line S: entry space 1: acoustic member
2: diaphragm 4: edge 10: junction tube portion of diaphragm 11: vibrator of diaphragm 13:
convex portion 14: Gate part 31a: Core of core mold (injection mold)
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