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JP2013042441

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DESCRIPTION JP2013042441
Abstract: In a diaphragm of an electro-acoustic transducer for converting vibration such as voice
to an electric signal, a center dome is reinforced with minimizing variations in its sensitivity and
frequency response, thereby lowering the high frequency reproduction limit To prevent the
occurrence of abnormal resonance. A diaphragm (1) of an electroacoustic transducer having a
center dome (2), wherein a reinforcing film (7) formed of the same material and shape as the
center dome is formed on the center dome. A groove 7a formed in a polygonal mesh shape is
provided on one surface of the reinforcing film to be adhered by an adhesive 6 made of a hot
melt, and the adhesive film 6 is formed on the other surface. The convex rib 8 corresponding to
is formed. [Selected figure] Figure 1
Electroacoustic transducer diaphragm and method of manufacturing the same
[0001]
The present invention relates to a diaphragm of an electroacoustic transducer that converts
vibration such as voice into an electric signal, and in particular, a diaphragm in which a center
dome portion of the diaphragm is reinforced with minimal variation in sensitivity and frequency
response and It relates to the manufacturing method.
[0002]
For example, in a diaphragm of a dynamic microphone or a headphone, there is a method of
forming a thin film of a sub dome portion of the diaphragm to reduce a resonance frequency in
order to expand the lower reproduction limit of the diaphragm.
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When this method is carried out, a film such as polyester is placed on a mold and heat-processed
to make a thin diaphragm. However, in that case, not only the thickness of the sub dome portion
becomes thin, but also the thickness of the center dome portion becomes thin, so the mechanical
strength of the center dome portion decreases, the high frequency reproduction limit decreases,
and abnormal resonance easily occurs. There was a problem of becoming
[0003]
In order to solve the above-mentioned subject, conventionally, the center dome portion is
reinforced by a method of adhering a reinforcing film of the same shape to the center dome
portion. However, in the method of attaching a reinforcing film to the center dome portion, if the
material of the film or adhesive is different from the material of the center dome portion, the
thermal expansion coefficient is different, so the temperature is as bimetal. There is a problem
that thermal deformation occurs due to the change. In addition, there is a problem that individual
differences occur due to thermal deformation, and variations occur in frequency response and
sensitivity.
[0004]
In order to address such problems, the applicant of the present application has, in Patent
Document 1, a reinforcing film in which the center dome portion is made of a material of the
same quality as that of the diaphragm and the same shape as the center dome forms a diaphragm
of the same quality. The diaphragm which is stuck by the adhesive agent comprised with the hotmelt of this invention is proposed.
[0005]
When manufacturing this diaphragm, as shown in FIG. 10, a reinforcing film 51 substantially
equal to the diameter of the center dome is placed above the mold 50, and the base film 52 is
covered from above, and a pressure pot ( (Not shown) is formed by lowering it toward the mold.
At this time, the reinforcing film 51 is also attached to the film by the hot melt adhesive 53. At
the same time, the organic solvent of the hot melt adhesive 53 is volatilized by the heat of the
mold 50, and the hot melt adhesive 53 is cured. As a result, as shown in FIG. 11, the center dome
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2
55 and the sub dome 56 having the reinforcing film 51 attached to the central portion are
formed.
[0006]
According to this configuration, since the base film 52, the reinforcing film 51, and the hot melt
adhesive 53 are made of homogeneous materials, variations in sensitivity and frequency
response due to temperature changes can be minimized.
[0007]
Patent No. 3049570
[0008]
However, in the configuration described in Patent Document 1, when the hot melt adhesive 53 is
dissolved at the time of forming the diaphragm, it is difficult to spread in the lateral direction due
to its high viscosity, and the thickness of the adhesive layer of the center dome 55 Unevenness
sometimes occurred.
Then, when unevenness occurs in the thickness of the adhesive layer of the center dome 55,
there is a problem that individual differences occur in sound quality due to variations in the
sensitivity and the frequency response.
[0009]
The present invention has been made focusing on the above points, and in the diaphragm of an
electroacoustic transducer that converts vibration such as voice to an electric signal, the center
dome is made to minimize variations in its sensitivity and frequency response. An object of the
present invention is to provide a diaphragm capable of suppressing and reinforcing, thereby
suppressing a drop in the high frequency reproduction limit and preventing occurrence of
abnormal resonance, and a method of manufacturing the same.
[0010]
In order to solve the problems described above, the diaphragm of the electroacoustic transducer
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according to the present invention is a diaphragm of an electroacoustic transducer having a
center dome, wherein the center dome is made of the same material and shape as the center
dome. The reinforcing film formed on the center dome is adhered by an adhesive made of hot
melt of the same quality as that of the center dome, and one surface of the reinforcing film to be
adhered by the adhesive is formed in a polygonal mesh shape A groove portion is provided, and a
convex rib corresponding to the groove portion is formed on the other surface.
Preferably, the adhesive is filled in the grooves formed in the polygonal mesh shape.
Preferably, the polygon is a hexagon, and the groove and the corresponding convex rib are
formed in a honeycomb shape. Thus, when forming the diaphragm by providing the groove
portion formed in a polygonal network shape on one surface of the reinforcing film to be
attached by the adhesive, the adhesive dissolved by heating is formed. Even if the viscosity is
high, it can be poured into the groove of the reinforcing film. As a result, the bonding surface to
the center dome can be made uniform, and variations in sensitivity to sound pressure and
frequency response (variations in sound quality difference) can be suppressed. Further, by
forming a convex rib corresponding to the groove portion on the other surface of the reinforcing
film, the mechanical strength of the center dome becomes high, and the effect of improving the
sound quality can be obtained.
[0011]
Further, in order to solve the problems described above, a method of manufacturing a diaphragm
of an electro-acoustic transducer according to the present invention is a method of
manufacturing a diaphragm of an electro-acoustic transducer having a center dome, Forming a
reinforcing film of the same material and shape as the center dome by the first heating mold
having the first die surface of the shape, and one surface of the forming surface of the
reinforcing film can be diluted with an organic solvent A step of applying an adhesive composed
of a hot melt of the same type as the center dome, a step of punching out a forming surface of
the reinforcing film, and a polygonal mesh on the surface of the same shape as the first pressing
surface. The punched reinforcing film is placed on the second heating die using a second heating
die provided with a second pressing die surface having a groove formed thereon, and the
diaphragm film is provided on the second heating die. Cover, the second Type by characterized in
that comprising the step of securing said reinforcing film to the diaphragm film. By carrying out
such a process, it is possible to obtain a diaphragm of an electroacoustic transducer exhibiting
the above-described effect.
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[0012]
According to the present invention, in the diaphragm of an electroacoustic transducer that
converts vibration such as voice to an electrical signal, variations in sensitivity and frequency
response in the center dome are minimized and reinforced, thereby achieving the high frequency
reproduction limit. It is possible to suppress the decrease and to prevent the occurrence of
abnormal resonance.
[0013]
FIG. 1 is a cross-sectional view showing an embodiment of the diaphragm of the present
invention.
FIG. 2 is a plan view of a part of the center dome portion of the diaphragm of FIG. 1 as viewed
from below. FIG. 3 is a cross-sectional view for explaining the method of manufacturing the
diaphragm of FIG. 1 and is a view for explaining the step of forming the reinforcing film into a
dome shape. FIG. 4 is a perspective view showing a dome-shaped reinforcing film produced in
the forming step of FIG. FIG. 5 is a cross-sectional view for explaining the punching step of the
dome-shaped reinforcing film. FIG. 6 is a cross-sectional view for explaining a process of forming
a diaphragm using the reinforcing film obtained in the process of FIG. FIG. 7 is a cross-sectional
view enlarging a part of FIG. FIG. 8 is a perspective view showing a diaphragm obtained in the
forming step of FIG. FIG. 9 is a cross-sectional view for explaining a punching step for punching
the diaphragm to a predetermined size. FIG. 10 is a cross-sectional view for explaining a
conventional method of manufacturing a diaphragm. FIG. 11 is a cross-sectional view of a
diaphragm obtained by the manufacturing method of FIG.
[0014]
Hereinafter, embodiments of the present invention will be described based on the drawings. FIG.
1 is a cross-sectional view showing an embodiment of the diaphragm of the present invention,
and FIG. 2 is a plan view of a part of the center dome portion of FIG. 1 as viewed from below. As
shown in FIG. 1, the diaphragm 1 includes a center dome 2, a sub dome 3 formed so as to
surround the outer periphery of the center dome 2, and a flat peripheral portion 4 formed on the
outer peripheral portion of the sub dome 3. ing. They are composed of, for example, a base film 5
made of a polyester film or the like having a thickness of about 9 μm and a dome-shaped
reinforcing film 7 attached to the center dome 2 via an adhesive 6.
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[0015]
For the reinforcing film 7, for example, a polyester film of the same material as the film 5 having
a thickness of 25 μm is used, and on its concave side, it is formed in a polygonal network,
specifically a honeycomb (hexagonal). The groove 7a is provided. Further, on the convex surface
side of the reinforcing film 7, as shown in FIGS. 1 and 2, a honeycomb-shaped convex rib 8
corresponding to the groove 7a is formed. The honeycomb shape (regular hexagon) formed by
the convex ribs 8 has a side length of, for example, about 1 mm. The adhesive 7 is filled in the
groove 7 a and hardened, and the adhesive 6 interposed between the base film 5 and the
reinforcing film 7 is formed of the honeycomb-shaped convex rib 8 (groove 7 a). The part is thick
and the other part is thin. Therefore, the mechanical strength of the center dome 2 is higher than
that of the conventional configuration (the configuration described in Patent Document 1). As the
adhesive 6, a polyester-based hot melt that can be diluted with an organic solvent is used.
[0016]
Then, the manufacturing method of the diaphragm 1 is demonstrated using FIGS. 3-9. First, the
dome-shaped reinforcing film 7 is formed by the first forming die 11 (first heating type) for
forming the diaphragm as shown in FIG. 3 and the pressure pot 12. The first mold 11 is formed
with a recess 13 (first pressing surface) having the same shape as the center dome 2 at the
center of the upper surface so as to form the diaphragm 1. A recess 14 having the same shape as
that of the sub dome 3 formed so as to surround the outer periphery of the recess 13 is formed,
and the outer peripheral portion of the recess 14 is a flat portion 15 for forming the peripheral
portion 4.
[0017]
The pressure pot 12 is formed to have a substantially U-shaped cross section, and a pressure
chamber 16 is provided therein, and the open portion thereof is positioned to face the upper
surface of the mold 11. The pressure pot 12 is fixed to a cylinder rod or the like (not shown) so
as to move up and down. An airtight O-ring 17 is attached to the open end edge of the pressure
pot 12. A pressurized air supply port 18 for connecting to a pressurized air supply source (not
shown) is formed on the side surface of the pressurized pot 12. Since these structures are the
same as the conventional thermoforming apparatus, the description of those detailed structures
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6
is abbreviate | omitted.
[0018]
The reinforcing film 7 is placed on the mold 11 heated to a preset temperature, and the pressure
pot 12 is lowered to place the reinforcement film 7 between the open end of the mold 11 and the
pressure pot 12. Fix it. Then, pressurized air is supplied from the pressurized air supply port 18
into the pressurizing chamber 16, and the reinforcing film 7 is formed in a shape according to
the recessed portions 13 and 14 formed on the upper surface of the forming die 11 by air
pressure and heat. Do. A plurality of reinforcing films 7 can be formed together as illustrated.
The adhesive 6 is applied to the central recess of the reinforcing film 7 thus formed as shown in
FIG. The application of the adhesive 6 may be performed by protruding from the outline of the
central recess.
[0019]
Next, only the central concave portion of the reinforcing film 7 is punched by a pair of punches
19 and 20 as shown in FIG. That is, the reinforcing film 7 is placed on the concave die 19 having
a through hole 21 having a diameter substantially equal to the diameter of the center dome 2 so
that the central recess thereof fits into the through hole 21 and is fitted into the through hole 21.
Only the central recess of the reinforcing film 7 can be punched out by lowering the convex
punches 20 having the punches 22 to be engaged and fitting the punches 22 into the through
holes 21.
[0020]
The reinforcing film 7 thus molded is placed on the recess 33 of the second mold 31 (second
heating mold) as shown in FIG. 6, and the base film 5 (diaphragm film) is placed thereon 3) is
lowered to form the center dome 2 and the sub dome 3 on the base film 5. Here, the second
molding die 31 has almost the same shape as the first molding die 11 shown in FIG. 3, but has
the recess 33 (second die surface) in place of the recess 13. .
[0021]
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In the recess 33, as shown in FIG. 7, a groove 33a is formed in a honeycomb shape in the entire
recess. This is for forming the honeycomb convex rib 8 shown in FIG. In this process, the
reinforcing film 7 is attached to the base film 5 with the adhesive 6, and at the same time, the
heat of the second forming die 31 forms a honeycomb groove 7a in the reinforcing film 7 along
the shape of the groove 33a. Be done.
[0022]
Further, the adhesive 6 applied to the concave portion of the reinforcing film 7 spreads so as to
be uniform in the surface direction by dissolving, but the molten adhesive 6 flows into the groove
portion 7 a of the reinforcing film 7 to further spread. It becomes uniform in the surface
direction. Then, the adhesive 6 is cured by volatilization of the organic solvent, and as shown in
FIG. 8, the center dome 2 and the sub dome 3 to which the reinforcing film 7 is attached are
formed at the central portion of the film 5. In addition, on the convex surface of the reinforcing
film 7 attached to the center dome 2, a honeycomb convex rib 8 as shown in FIG. 1 and FIG. 2 is
formed.
[0023]
The base film 5 thus formed is punched to the outer diameter of the diaphragm 1 as shown in
FIG. 1 by the pair of punches 23 and 24 shown in FIG. That is, the base film 5 is placed on a
concave die 23 having a through hole 25 having a diameter substantially equal to the outer
diameter of the peripheral portion 4 of the diaphragm 1 so that the center portion thereof is
positioned at the center of the through hole 25. The diaphragm 1 can be punched out by fitting
the punch 26 into the through hole 25 by lowering the convex punch 24 having the punch 26
fitted into the through hole 25.
[0024]
As described above, according to the embodiment of the present invention, in the center dome 2,
the reinforcing film 7 formed of the same material and shape as the center dome 2 can be
formed from the same type of hot melt as the center dome 2. The adhesive 6 is attached. Further,
on one surface (concave surface) of the reinforcing film 7 to be attached by the adhesive 6, a
groove 7a formed in a honeycomb shape is provided. Therefore, when forming the diaphragm 1,
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the adhesive 6 dissolved by heating flows into the groove 7a of the reinforcing film 7 even if it
has viscosity, and the bonding surface to the base film 5 becomes uniform. Therefore, it is
possible to suppress variations in sensitivity to sound pressure and frequency response
(variations in sound quality difference). Further, on the other surface (convex surface) of the
reinforcing film 7, a convex rib 8 corresponding to the groove 7a is formed. For this reason, the
mechanical strength of the center dome 2 becomes high, and the effect of the sound quality
improvement can be obtained.
[0025]
In the embodiment, the concave portion of the reinforcing film 7 is provided with the groove
portion 7a formed in a honeycomb shape (hexagonal shape), and the convex portion 8 of the
honeycomb shape corresponding to the groove portion 7a is provided on the convex surface side.
Was provided. However, in the configuration of the diaphragm 1 according to the present
invention, the groove 7a and the convex rib 8 are not limited to the configuration formed in a
honeycomb shape, and may be a polygonal mesh shape. As such a polygon that can be
configured in a mesh shape, a triangle, a square, and the like can be mentioned.
[0026]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 center dome 3 sub dome 4 peripheral part 5 base
film (diaphragm film) 6 adhesive 7 reinforcement film 7 a groove | channel 8 convex rib 11 1st
shaping | molding type (1st heating type | mold) 12 pressure pot 13 recessed portions First die
surface 14) Recess 15 Flat portion 16 Pressure chamber 17 O ring 18 Pressure air supply port
19 Extraction die 20 Extraction die 21 Through hole 22 Punch 23 Extraction die 24 Extraction
die 25 Through hole 26 Punch 31 Second Mold (second heating type) 33 Recess 33a Groove
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