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JPH11289595

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11289595
[0001]
The present invention relates to a diaphragm main body, and an inner peripheral edge portion is
provided so as to overlap the outer peripheral edge portion of the diaphragm main body, and the
material of the diaphragm main body is different. The present invention relates to a diaphragm
for an electroacoustic transducer comprising an edge of a material in which a foaming agent is
mixed with rubber as a component, and a method of manufacturing the same.
[0002]
2. Description of the Related Art The conditions required for a diaphragm for an electroacoustic
transducer (hereinafter referred to as a diaphragm in the present specification) include good
linearity with respect to an input signal, difficulty in causing an inverse resonance phenomenon,
and sufficient reliability. Properties, ease of manufacture, low cost, and light weight.
[0003]
As for the structure of the diaphragm, a fixed edge diaphragm in which the diaphragm body and
the edge are integrally formed, and a free edge diaphragm in which the diaphragm body and the
edge are separate members have been proposed.
[0004]
The fixed edge diaphragm does not require the step of bonding the diaphragm body and the
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1
edge, so the manufacturing process is simplified.
However, since the material of the edge is a relatively high rigidity material which is the same as
the material of the diaphragm main body, it is difficult to satisfy the conditions required for the
above-described diaphragm.
[0005]
On the other hand, in the free edge diaphragm, the diaphragm main body and the edge can be
made of different materials, so it is relatively easy to achieve the conditions required for the
diaphragm described above as compared to the fixed edge diaphragm, but the edge A process of
bonding to the diaphragm main body is required, and there is a problem that the number of
manufacturing processes increases.
[0006]
In order to solve the problems of the free edge diaphragm, a method has been proposed in which
the diaphragm main body and the edge are integrated at the same time using an injection
molding method to mold the edge in the mold.
[0007]
However, since the material of the edge manufactured by the conventional injection molding
method is a solid structure (for example, various vulcanized rubbers, thermoplastic elastomers,
etc.), residual stress caused by shrinkage of the edge during molding There is a problem that the
relaxation is not performed well and the edge is greatly deformed.
[0008]
In order to solve this problem, a method as shown in FIG. 10 has been proposed.
That is, first, as shown in (a), the diaphragm body 1 formed in advance is set to one mold 2 of the
double mold, and then, as shown in (b), rubber of the main component The edge base material 3
mixed with the foaming agent is set in one mold 2.
[0009]
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Then, as shown in FIG. 6C, when one mold 2 of the double mold and the other mold 4 are heated,
the edge base material 3 melts and foams, and the edge 5 is formed. The main body 1 and the
edge 5 are integrated, and as shown in the (d) figure, the diaphragm 6 in which the edge 5 is
integrally formed on the outer peripheral edge portion of the diaphragm main body 1 is formed.
[0010]
By forming the edge 5 using this method, it is possible to realize an excellent diaphragm with
excellent acoustic characteristics and less deformation.
[0011]
However, in the method of integrally forming the edge on the outer peripheral edge portion of
the diaphragm main body using rubber mixed with a foaming agent as the material of the edge,
the following problems may occur. is there.
[0012]
(1)
Depending on the material of the diaphragm body, the bonding strength between the diaphragm
body and the edge is reduced.
(2) In the conventional free-edge diaphragm in which the diaphragm body and the edge are
bonded using an adhesive, an adhesive is interposed between the diaphragm body and the edge,
and this adhesive provides a certain internal loss, and vice versa The effect of preventing the
resonance phenomenon and dispersing the resonance by the sticking deviation between the
diaphragm body and the edge can be obtained.
[0013]
However, as shown in FIG. 10D, in the diaphragm manufactured by the method of integrally
forming the edge on the outer peripheral edge portion of the diaphragm main body using rubber
mixed with a foaming agent as the material of the edge, There is nothing interposed between the
plate body 1 and the edge 5, the diaphragm body 1 and the edge 5 are in direct contact, and the
dimensional stability is excellent, so that the reverse resonance phenomenon is apt to occur.
[0014]
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(3)
Since the mold shape is complicated, the releasability between the edge and the mold is poor,
maintenance of the mold is difficult, and the production efficiency is reduced.
For example, in FIG. 10 (d), although the melted edge base material 3 abuts on the surface 4a of
the other mold 4, it is an undercut surface, and when the other mold 4 is removed, the surface 4a
The releasability of the edge 5 and the edge 5 is poor, and dirt tends to be accumulated on the
surface 4 a.
[0015]
Furthermore, the dirt on this surface 4a is difficult to clean and maintenance is difficult.
The present invention has been made in view of the above problems, and a first object of the
present invention is to provide a diaphragm for an electroacoustic transducer in which the
adhesive strength between the diaphragm body and the edge is improved, and a method of
manufacturing the same.
[0016]
The second object is to provide a diaphragm for an electroacoustic transducer in which the
reverse resonance phenomenon hardly occurs and a method of manufacturing the same.
The third object is to provide an electroacoustic transducing diaphragm and a method of
manufacturing the same, which have good releasability between the edge and the mold, easy
maintenance of the mold, and improved production efficiency.
[0017]
The invention according to claim 1 which solves the above problems is a diaphragm main body,
and an inner peripheral edge portion is provided so as to overlap an outer peripheral edge
portion of the diaphragm main body, the diaphragm main body A diaphragm for an
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electroacoustic transducer comprising an edge of a material in which a main component rubber
is mixed with a foaming agent, the thickness of the outer peripheral edge portion of the
diaphragm main body being an outer peripheral edge The electroacoustic transducer diaphragm
is characterized in that it is thinner than the thickness in the vicinity of the portion, and the
thickness of the inner peripheral edge portion of the edge is thinner than the thickness in the
vicinity of the inner peripheral edge portion.
[0018]
The thickness of the outer peripheral edge portion of the diaphragm main body is thinner than
the thickness in the vicinity of the outer peripheral edge portion, and the thickness of the inner
peripheral edge portion of the edge overlapping the outer peripheral portion of the diaphragm is
thinner than the thickness in the vicinity of the inner peripheral edge portion Thus, the area in
which the outer peripheral edge of the diaphragm body and the inner peripheral edge of the
edge are in contact is increased, and the bonding strength between the diaphragm body and the
edge is increased.
[0019]
Further, the rigidity of the portion where the outer peripheral edge of the diaphragm body and
the inner peripheral edge of the edge overlap is an intermediate rigidity between the rigidity near
the outer peripheral edge of the diaphragm main body and the rigidity near the inner peripheral
edge of the edge. , Reverse resonance phenomenon is less likely to occur.
[0020]
The thickness of the portion where the outer peripheral edge of the diaphragm main body and
the inner peripheral edge of the edge overlap is substantially the same as the thickness of the
other portion of the edge. It is a diaphragm for electroacoustic transducers characterized by the
above.
[0021]
The undercut surface is formed on the surface forming the edge of the mold by making the
thickness of the overlapping portion of the outer peripheral edge portion of the diaphragm body
and the inner peripheral edge portion of the edge substantially the same as the thickness of the
other portion of the edge. There is no mold removability between the edge and the mold,
maintenance of the mold is easy, and production efficiency is improved.
[0022]
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The invention according to claim 3 is a diaphragm main body, and an inner peripheral edge
portion is provided so as to overlap the outer peripheral edge portion of the diaphragm main
body, and is a material different from the material of the diaphragm main body. A diaphragm of
an electro-acoustic transducer consisting of an edge of a material mixed with a foaming agent,
wherein a first stepped portion having a thickness substantially the same as the thickness in the
vicinity of the outer peripheral edge portion is provided on the outer peripheral edge portion of
the diaphragm main body. A second stepped portion engaged with the first stepped portion at a
thickness substantially the same as a thickness in the vicinity of the inner peripheral edge
portion provided on an inner peripheral edge portion of the edge; It is a diaphragm.
[0023]
A first stepped portion having a thickness substantially the same as the thickness in the vicinity
of the outer peripheral edge is provided on the outer peripheral edge of the diaphragm main
body, and an inner peripheral edge of the edge has a thickness substantially the same as the
thickness in the vicinity of the inner peripheral edge By providing the second stepped portion
engaged with the first stepped portion, the contact area between the outer peripheral edge
portion of the diaphragm body and the inner peripheral edge portion of the edge is increased,
and adhesion between the diaphragm body and the edge is provided. Strength is increased.
[0024]
In addition, since the first step of the diaphragm main body and the second step of the edge are
engaged, the undercut surface is not formed on the surface forming the edge of the mold, and the
separation of the edge and the mold Good moldability, easy mold maintenance, and improved
production efficiency.
[0025]
The invention according to claim 4 is a diaphragm main body, and an inner peripheral edge
portion is provided so as to overlap the outer peripheral edge portion of the diaphragm main
body, and is a material different from the material of the diaphragm main body. Method of
manufacturing a diaphragm for an electroacoustic transducer comprising an edge of a material
mixed with a foaming agent, wherein the thickness of the outer peripheral edge portion is
thinner than the thickness in the vicinity of the outer peripheral edge portion, and the diaphragm
The main body and the base material in which the foaming agent is mixed with the main
component rubber are placed in one of the molds of the combination type and clamped using the
other mold of the combination type, and then the combination mold is heated Vibration for an
electroacoustic transducer characterized in that the inner peripheral edge portion of the edge is
integrated with the outer peripheral edge portion of the diaphragm at the same time as forming
an edge where the thickness of the inner peripheral edge portion is thinner than the thickness
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near the inner peripheral edge portion. It is a manufacturing method of a board.
[0026]
The thickness of the outer peripheral edge portion of the diaphragm main body is thinner than
the thickness in the vicinity of the outer peripheral edge portion, and the thickness of the inner
peripheral edge portion of the edge overlapping the outer peripheral portion of the diaphragm is
thinner than the thickness in the vicinity of the inner peripheral edge portion Thus, the area in
which the outer peripheral edge of the diaphragm body and the inner peripheral edge of the
edge are in contact is increased, and the bonding strength between the diaphragm body and the
edge is increased.
[0027]
Further, the rigidity of the portion where the outer peripheral edge of the diaphragm body and
the inner peripheral edge of the edge overlap is an intermediate rigidity between the rigidity near
the outer peripheral edge of the diaphragm main body and the rigidity near the inner peripheral
edge of the edge. , Reverse resonance phenomenon is less likely to occur.
[0028]
The invention according to claim 5 is that the thickness of the portion where the outer peripheral
edge portion of the diaphragm body according to the invention of claim 4 and the inner
peripheral edge portion of the edge overlap is substantially the same as the thickness of the
other portion of the edge. It is a manufacturing method of the diaphragm for electroacoustic
transducers characterized by having been.
[0029]
The undercut surface is formed on the surface forming the edge of the mold by making the
thickness of the overlapping portion of the outer peripheral edge portion of the diaphragm body
and the inner peripheral edge portion of the edge substantially the same as the thickness of the
other portion of the edge. There is no mold removability between the edge and the mold,
maintenance of the mold is easy, and production efficiency is improved.
[0030]
The invention according to claim 6 is a diaphragm main body, and an inner peripheral edge
portion is provided so as to overlap the outer peripheral edge portion of the diaphragm main
body, and is a material different from the material of the diaphragm main body. Method of
manufacturing a diaphragm for an electroacoustic transducer comprising an edge of a material
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mixed with a foaming agent, the diaphragm having a first stepped portion having a thickness
substantially the same as the thickness in the vicinity of the outer peripheral edge in the outer
peripheral edge. A main body was formed, the diaphragm main body, and a base material in
which a foaming agent was mixed with the main component rubber were placed in one mold of
the combination type and clamped using the other mold of the combination type. After that, the
laminated mold is heated, and an edge having a second step portion having a thickness
substantially the same as that in the vicinity of the inner peripheral portion is formed at the inner
peripheral portion and engaged with the first stepped portion. Manufacturing an electro-acoustic
transducer diaphragm characterized in that an inner peripheral edge of the edge is integrated
with an outer peripheral edge of the diaphragm. It is the law.
[0031]
A first stepped portion having a thickness substantially the same as the thickness in the vicinity
of the outer peripheral edge is provided on the outer peripheral edge of the diaphragm main
body, and an inner peripheral edge of the edge has a thickness substantially the same as the
thickness in the vicinity of the inner peripheral edge By providing the second stepped portion
engaged with the first stepped portion, the contact area between the outer peripheral edge
portion of the diaphragm body and the inner peripheral edge portion of the edge is increased,
and adhesion between the diaphragm body and the edge is provided. Strength is increased.
[0032]
In addition, since the first step of the diaphragm main body and the second step of the edge are
engaged, the undercut surface is not formed on the surface forming the edge of the mold, and the
separation of the edge and the mold Good moldability, easy mold maintenance, and improved
production efficiency.
[0033]
In the invention according to any one of claims 1 to 6, examples of the rubber which is the main
component of the edge include vulcanized rubber and thermoplastic elastomer.
Here, as the vulcanized rubber, from the group consisting of styrene-butadiene rubber, nitrilebutadiene rubber, ethylene-propylene-terpolymer rubber, isoprene rubber, chloroprene rubber,
isobutylene-isoprene rubber, ethylene-propylene rubber and silicone rubber There is a choice.
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[0034]
The thermoplastic elastomer may be selected from the group consisting of polystyrene,
polyolefin, polyurethane, polyester, polyamide, polybutadiene, ethylene-vinyl acetate, and
polyvinyl chloride.
[0035]
Further, as the foaming agent, there is a gas generating type by thermal decomposition, and the
specific gravity of the foamed edge is preferably in the range of 0.07 to 1.2.
[0036]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present
invention will be described with reference to the drawings.
1.
First Embodiment of the Invention According to the First, Second, Fourth, and Fifth Aspects of the
Invention FIG. 1 is a cross-sectional view of a diaphragm according to a first embodiment of the
present invention, and FIG. Sectional drawing, (b) A figure is an enlarged view of A part of a (a)
figure.
[0037]
(a) In the figure, the diaphragm 10 is provided so that the inner peripheral edge portion overlaps
the diaphragm main body 12 and the outer peripheral edge portion of the diaphragm main body
12, and the material is different from the material of the diaphragm main body 12, It consists of
an edge 14 made of a material in which a foaming agent is mixed with rubber as a main
component.
[0038]
Then, as shown in (b), the first step 16 is provided on the back side of the outer peripheral edge
of the diaphragm main body 12, and the surface of the inner peripheral edge of the edge 14 is
provided with the first stepped part 16. A second step 18 is formed which engages with one step
16.
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[0039]
The thickness T ′ of the first step 16 formed at the outer peripheral edge of the diaphragm
main body 12 is smaller than the thickness T near the outer peripheral edge.
The thickness t ′ of the second step 18 formed at the inner peripheral edge of the edge 14 is
smaller than the thickness t near the inner peripheral edge.
[0040]
Furthermore, the thickness (T ′ + t ′) of the portion where the outer peripheral edge of
diaphragm 12 and the inner peripheral edge of edge 14 overlap is approximately the same as the
thickness (t) of the other portion of edge 14 It is set to.
[0041]
Next, a method of manufacturing the diaphragm 10 having the above configuration will be
described with reference to FIGS. 2 and 3.
Production of diaphragm main body (see FIG. 2) (1) Pulp of 100% of wood fibers is cut into a
predetermined shape to obtain a diaphragm main body 12 '(see FIG. 2A).
[0042]
(2) The diaphragm main body material 12 'is heated (200 ° C.) for about 100 seconds by using
the molds 21 and 22 and compressed (see FIG. (B)) and dried (see (c)). A diaphragm main body
material 12 ′ ′ in which the step 16 is formed is obtained.
[0043]
(3) A central portion 12a ′ ′ and an outer peripheral portion 12b ′ ′ of the diaphragm main
body material 12 ′ ′ are removed to form a diaphragm main body 12 in which a first stepped
portion 16 is formed at the outer peripheral edge (see FIG. (D)).
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[0044]
Note that reheating (200 ° C.) may be performed for about 5 seconds using the molds 21 and
22 between (2) and (3).
Integral molding of the diaphragm main body and the edge (see FIG. 3) (1) The first diaphragm
main body 12 having the first stepped portion 16 formed at the outer peripheral edge is set in
one mold 31 of the mating type. (See (a) figure).
[0045]
(2)
The edge base material 33 of the material which mixed the foaming agent with the rubber | gum
of the main component was set to one mold 31 of a lamination | stacking type | mold (refer the
figure (b)).
Examples of the rubber that is the main component of the edge base material 33 include
vulcanized rubber or thermoplastic elastomer.
[0046]
Here, as the vulcanized rubber, from the group consisting of styrene-butadiene rubber, nitrilebutadiene rubber, ethylene-propylene-terpolymer rubber, isoprene rubber, chloroprene rubber,
isobutylene-isoprene rubber, ethylene-propylene rubber and silicone rubber There is a choice.
[0047]
The thermoplastic elastomer may be selected from the group consisting of polystyrene,
polyolefin, polyurethane, polyester, polyamide, polybutadiene, ethylene-vinyl acetate, and
polyvinyl chloride.
[0048]
Further, as the foaming agent, there is a gas generating type by thermal decomposition, and the
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specific gravity of the foamed edge is preferably in the range of 0.07 to 1.2.
(3) After clamping using the other mold 35 of the combination mold, the combination mold 37 is
heated.
Then, the viscosity of the edge base material 33 is lowered and the foam is generated, and the
second step 18 is formed in the inner peripheral edge portion in the space formed between the
one mold 31 and the other mold 35 An edge 14 is formed.
At this time, the inner peripheral edge portion of the edge 14 and the outer peripheral edge
portion of the diaphragm main body 12 are bonded and integrated by the self-adhesive force of
the edge base material 33 (see (c)).
[0049]
In the present embodiment, the diaphragm main body 12 and the edge 14 integrally formed
using the mating mold 37 consisting of one mold 31 and the other mold 35 are the diaphragm
main body 12. The thickness (T '+ t') of the portion where the outer peripheral edge portion of
the edge 14 and the inner peripheral edge portion of the edge 14 overlap is formed to be
substantially the same as the thickness (t) of the other portion of the edge 14.
[0050]
According to the diaphragm 10 and the method of manufacturing the diaphragm 10 having the
above-described configuration, the following effects can be obtained.
(1) As shown in FIG. 4B, in the conventional diaphragm, the back surface of the outer peripheral
edge portion of the diaphragm main body 1 and the surface of the inner peripheral edge portion
of the edge 5 are in contact and bonded.
[0051]
On the other hand, in the present embodiment, as shown in FIG. 4A, the first stepped portion 16
is provided on the back surface side of the outer peripheral edge portion of the diaphragm main
body 12 so that the outer peripheral edge portion of the diaphragm main body 12 is The second
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stepped portion 18 is provided on the surface side of the inner peripheral edge portion of the
edge 14 overlapping the outer peripheral edge portion of the diaphragm main body 12 so that
the thickness is thinner than the thickness in the vicinity of the outer peripheral edge portion. By
making the thickness of the portion thinner than the thickness in the vicinity of the inner
peripheral edge, not only the outer peripheral edge rear surface of the diaphragm main body 12
and the outer peripheral edge surface of the edge 14 but also the end face of the diaphragm
main body 12 The end faces of the edge 14 are in contact with the diaphragm body 12
respectively.
[0052]
Therefore, compared with the conventional diaphragm, the area in which the outer peripheral
edge portion of the diaphragm main body 12 contacts the inner peripheral edge portion of the
edge 14 is increased, and the bonding strength between the diaphragm main body 12 and the
edge 14 is increased.
[0053]
(2)
As shown in FIG. 4B, in the conventional diaphragm, the rigidity rapidly changes in the portion
where the inner peripheral edge portion of the diaphragm main body 1 and the outer peripheral
edge portion of the edge 5 overlap.
On the other hand, as shown in FIG. 4A, in the present embodiment, the rigidity of the portion
overlapping the outer peripheral edge portion of the diaphragm main body 12 and the inner
peripheral edge portion of the edge 14 is determined in the vicinity of the outer peripheral edge
portion of the diaphragm main body 12 The rigidity is intermediate between the rigidity and the
rigidity in the vicinity of the inner peripheral edge portion of the edge 14, so that the reverse
resonance phenomenon hardly occurs.
[0054]
(3) By making the thickness of the portion where the outer peripheral edge portion of the
diaphragm main body 12 overlaps the inner peripheral edge portion of the edge 14 substantially
the same as the thickness of the other portion of the edge 14, The undercut surface disappears
on the surface forming the surface 14, the releasability between the edge 14 and the molds 31,
35 is good, the maintenance of the molds 31, 35 is easy, and the production efficiency is
improved. The present invention is not limited to the embodiment.
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[0055]
For example, as shown in FIG. 5 (a), a first stepped portion 41 is provided on the outer peripheral
edge of the diaphragm main body 12 on the side opposite to that of the embodiment, that is, the
surface side. The thickness of the outer peripheral edge portion 12 is formed thinner than the
thickness in the vicinity of the outer peripheral edge portion, and the second step portion 43 is
formed on the inner peripheral edge portion of the edge 14 on the opposite side to the
embodiment. The thickness of the inner peripheral edge portion of the edge 14 may be thinner
than the thickness in the vicinity of the inner peripheral edge portion, and the outer peripheral
edge portion of the diaphragm main body 12 and the inner peripheral edge portion of the edge
14 may be overlapped.
[0056]
As shown in FIG. 5B, the thickness of the outer peripheral edge portion of the diaphragm main
body 12 is reduced stepwise, and the thickness of the inner peripheral edge portion of the edge
14 is reduced stepwise, and the outside of the diaphragm main body 12 is The peripheral portion
and the inner peripheral portion of the edge 14 may be overlapped.
[0057]
As shown in FIG. 5C, the thickness of the outer peripheral edge portion of the diaphragm main
body 12 is reduced in a wavy shape, and the thickness of the inner peripheral edge portion of the
edge 14 is reduced in a wavy shape. The outer peripheral edge and the inner peripheral edge of
the edge 14 may be overlapped.
[0058]
As shown in FIG. 5D, the thickness of the outer peripheral edge of the diaphragm main body 12
is gradually decreased, and the thickness of the inner peripheral edge of the edge 14 is gradually
reduced. The peripheral portion and the inner peripheral portion of the edge 14 may be
overlapped.
[0059]
As shown in FIG. 5E, the first stepped portion 45 is formed on the surface side of the outer
peripheral edge portion of the diaphragm main body 12 and the second stepped portion 47 is
formed on the back surface side. While providing the convex part 49 in an end surface, you may
form the recessed part 51 which the convex part 49 of the diaphragm main body 12 engages in
the inner peripheral side end surface of the edge 14. FIG.
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[0060]
2. Second Embodiment of the Invention According to the Third and Third Inventions Next, a
second embodiment will be described with reference to FIG.
[0061]
(a) In the figure, a first step 61 is formed on the outer peripheral edge of the diaphragm main
body 12 so as to protrude to the back side and has substantially the same thickness as the
thickness near the outer peripheral edge. A second step 63 is formed which protrudes to the
front surface side and which is engaged with the first step 61 of the diaphragm main body 12
substantially the same as the thickness in the vicinity of the inner peripheral edge.
[0062]
The diaphragm having such a shape is manufactured using one mold 65 of the combination type
and the other mold 67, and the manufacturing method is the same as that of the first
embodiment, so the description will be omitted.
[0063]
According to the diaphragm and the method of manufacturing the diaphragm having the abovedescribed configuration, the following effects can be obtained.
(1) As in the first embodiment, the contact area between the diaphragm body 12 and the edge 14
increases the adhesive strength between the diaphragm body 12 and the edge 14.
[0064]
(2) By engaging the first stepped portion 61 of the diaphragm main body 12 and the second
stepped portion 63 of the edge 14, the undercut surface disappears in the surface forming the
edge 14 of the mold 65, 67, and the edge The mold releasability between the mold 14 and the
mold 65, 67 is good, maintenance of the mold 65, 67 is easy, and the production efficiency is
improved.
[0065]
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The present invention is not limited to the above embodiment.
For example, as shown in FIG. 6B, a first step 71 is formed on the outer peripheral edge of the
diaphragm main body 12 so as to protrude to the surface side and has substantially the same
thickness as the thickness near the outer peripheral edge. Even if a second step portion 73 is
formed on the inner peripheral edge portion to protrude to the back surface side and engage
with the first stepped portion 71 of the diaphragm main body 12 with substantially the same
thickness as the thickness in the vicinity of the inner peripheral edge portion. The same effects as
those of the diaphragm and the method of manufacturing the diaphragm can be obtained.
[0066]
EXAMPLES The inventors of the present invention conducted the following experiments to
confirm the effects of the present invention.
Experiment 1.
Adhesive strength between diaphragm and edge The five diaphragms with a diameter of 160 mm
are manufactured by the conventional manufacturing method and the manufacturing method of
the first embodiment, and as shown in FIG. Cut out a 15 mm wide sample.
[0067]
Therefore, the number of samples of the conventional diaphragm is 20, and the number of
samples of the diaphragm of the present invention is 20.
The tensile strength of all these samples was investigated.
The tensile tester used was STOROGRAPH R (manufactured by Toyo Seiki Co., Ltd.), and the
pulling speed was 50 mm / min.
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[0068]
As understood from FIG. 8 showing this result, it has been confirmed that the adhesive strength
between the diaphragm and the edge is improved.
Experiment .2 Frequency Sound Pressure Characteristic Experiment 1.
The frequency sound pressure characteristics of the conventional diaphragm manufactured by
and the diaphragm of the present invention were examined.
It was confirmed that the diaphragm of the present invention has a smooth characteristic and no
reverse resonance phenomenon has occurred as compared with the conventional diaphragm.
[0069]
As described above, according to the diaphragm for the electroacoustic transducer of the
invention of claim 1 and the method for manufacturing the diaphragm for the electroacoustic
transducer of claim 4, the outer peripheral edge of the diaphragm body The thickness of the
portion is made thinner than the thickness in the vicinity of the outer peripheral edge, and the
thickness of the inner peripheral edge of the edge overlapping this outer peripheral portion of
the diaphragm is thinner than the thickness in the vicinity of the inner peripheral edge. The area
of contact between the outer peripheral edge and the inner peripheral edge of the edge is
increased, and the bonding strength between the diaphragm body and the edge is increased.
[0070]
Further, the rigidity of the portion where the outer peripheral edge of the diaphragm body and
the inner peripheral edge of the edge overlap is an intermediate rigidity between the rigidity near
the outer peripheral edge of the diaphragm main body and the rigidity near the inner peripheral
edge of the edge. , Reverse resonance phenomenon is less likely to occur.
[0071]
According to the diaphragm for electro-acoustic transducer of the invention of claim 2 and the
method for manufacturing the diaphragm for electro-acoustic transducer of claim 5, the outer
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peripheral edge portion of the diaphragm body and the inner peripheral edge portion of the edge
are By making the thickness of the overlapping portion substantially the same as the thickness of
the other portion of the edge, there is no undercut surface on the surface forming the edge of the
mold, and the releasability between the edge and the mold is good, gold Maintenance of the mold
is easy and production efficiency is improved.
[0072]
According to the diaphragm for electro-acoustic transducer of the invention of claim 3 and the
method for manufacturing the diaphragm for electro-acoustic transducer of claim 6, the outer
peripheral edge portion of the diaphragm body has a thickness in the vicinity of the outer
peripheral edge portion A first step having substantially the same thickness is provided, and a
second step engaging with the first step is formed on the inner peripheral edge of the edge at a
thickness substantially the same as the thickness near the inner peripheral edge. Due to the
provision, the area in which the outer peripheral edge portion of the diaphragm main body and
the inner peripheral edge portion of the edge are in contact is increased, and the bonding
strength between the diaphragm main body and the edge is increased.
[0073]
In addition, since the first step of the diaphragm main body and the second step of the edge are
engaged, the undercut surface is not formed on the surface forming the edge of the mold, and the
separation of the edge and the mold Good moldability, easy mold maintenance, and improved
production efficiency.
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