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JPH11187481

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11187481
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for an electroacoustic transducer which comprises a diaphragm main body and an
edge of an outer peripheral surface of the diaphragm main body which is different from the
diaphragm main body.
[0002]
2. Description of the Related Art The physical properties required of diaphragms for
electroacoustic transducers such as speakers are large in specific modulus (E / ;; E: Young's
modulus, ρ: specific gravity) and specific flexural rigidity (E / ρ 3). It has moderate internal loss,
is resistant to mechanical fatigue, and has good weather resistance.
[0003]
In particular, a free edge diaphragm 3 using a diaphragm main body 1 as shown in FIG. 7 mainly
made of natural fibers and a urethane foam or woven fabric as a base material for the edge 2 is a
diaphragm It is superior to the one using synthetic resin and metal for the main body 1 and the
one using vulcanized rubber and thermoplastic elastomer for the edge 2 in light of mass, freedom
of design, cost and the like.
[0004]
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1
On the other hand, in recent years, waterproofness has become an important characteristic
mainly for in-vehicle speakers.
However, since the free edge diaphragm 13 described above is not waterproof, the following
proposals have been made in order to provide waterproof.
[0005]
(1)
A method of impregnating the free edge diaphragm 3 with a highly waterproof resin.
(2) As shown in FIG. 8A, in order to waterproof from the direction of arrow A, the synthetic resin
film is heat-pressed and heat-adsorbed on the diaphragm main body 1 and the edge 2
respectively to form the film layers 3 and 4 , And then bonding the diaphragm body 1 and the
edge 2.
[0006]
As shown in FIG. 8 (b), in order to waterproof from the direction of arrow B, the synthetic resin
film is heat-pressed and heat-adsorbed on the diaphragm main body 1 and the edge 2
respectively to form the film layers 3 and 4. , And then bonding the diaphragm body 1 and the
edge 2.
[0007]
However, the method of impregnating the resin with high waterproofness to the free edge
diaphragm 3 of (1) is that the resin to be impregnated is silicone type, wax type or fluorine type,
and the adhesion in the subsequent assembly process is alienated. There is a problem of
[0008]
Further, in the method of forming a film layer on the diaphragm main body 1 and the edge 2 in
(2) and then bonding the diaphragm main body 1 and the edge 2, a film is formed on the end
face 2a of the edge 2 in FIG. Since there is no layer, and there is no film layer on the end face 1a
of the diaphragm main body 1 in FIG.
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2
[0009]
Therefore, as shown in FIG. 9, after bonding the diaphragm main body 1 and the edge 2 in
Japanese Patent Laid-Open No. 6-78 393, the synthetic resin film is thermocompression-bonded
or heat-adsorbed over the entire diaphragm to form a film layer. It is described to form 5.
[0010]
With such a configuration, it is possible to prevent the entry of water from the end faces 1a and
2a of the diaphragm main body 1 and the edge 2.
[0011]
However, in the diaphragm having the configuration shown in FIG. 9, when the film layer 5 is
formed using a thin film, it is assumed that the material of the edge 2 is a porous material such
as urethane foam. Depending on the degree of softening of the film and the condition of
pressure, pinholes are generated in the film layer 5 and there is a problem that the
waterproofness is lowered.
[0012]
On the contrary, when the film layer 5 is formed using a thick film, the edge 2 which is less rigid
than the diaphragm main body 1 may be caused by shrinkage of the film generated when
forming the film layer, relaxation of residual stress under each environment, etc. There is also the
problem of being pulled and greatly deformed.
[0013]
Furthermore, when the hardness of the film is low, the film rigidity is reduced, which causes a
problem of poor workability.
In addition, if the film is not heat resistant, there is a problem that the film penetrates into the
base plate 1 and the edge 2 of the base material when it is left for a long time under high
temperature, and the waterproofness is lowered.
[0014]
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Furthermore, in the case of a film in which both the heat resistance and the hardness of the film
are too high, there is a problem that the formability and the adhesion are alienated.
The present invention has been made in view of the above problems, and its first object is to
provide an appropriate thickness of a film layer provided over the entire area of the diaphragm.
[0015]
The second object of the present invention is to provide an appropriate material of the film layer
provided over the entire area of the diaphragm.
[0016]
The invention according to claim 1 for solving the above-mentioned problems comprises a
diaphragm main body and an edge provided on the outer peripheral edge of the diaphragm main
body and different in material from the diaphragm main body. It is a diaphragm for
electroacoustic transducers, Comprising: The synthetic resin film layer with a thickness of 25-45
micrometers was provided in the whole area of at least one surface of the diaphragm for
electroacoustic transducers, It is a diaphragm for electroacoustic transducers characterized by
the above-mentioned.
[0017]
By forming the synthetic resin film layer over the entire area of the diaphragm after bonding the
diaphragm body and the edge, the shape retention of the edge is improved and the deformation
is suppressed as compared to the case where the film layer is formed on the edge alone. Can.
[0018]
Further, since the end face of the edge and the end face of the diaphragm main body are also
covered with the film layer of synthetic resin, the entry of water from the end face is eliminated
and the waterproofness is improved.
Furthermore, since the formation of the synthetic resin film layer can be performed in one step,
the cost can be reduced as compared to forming the film layer on the diaphragm main body and
the edge respectively.
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[0019]
Further, by setting the thickness of the synthetic resin film layer to 25 to 45 μm, it is possible to
obtain a diaphragm for an electroacoustic transducer which is less in deformation and excellent
in waterproofness.
In the invention according to claim 2, the synthetic resin film layer according to the invention
according to claim 1 comprises polyethylene for an ethylene copolymer resin containing
monocarboxylic acid, dicarboxylic acid, dicarboxylic acid anhydride and metal chlorides thereof.
A diaphragm for an electroacoustic transducer, characterized in that the material is blended by
1% to 40% by weight.
[0020]
The synthetic resin film layer is made of a material in which 1% to 40% by weight of
polyethylene is blended with an ethylene-based copolymer resin containing monocarboxylic acid,
dicarboxylic acid, dicarboxylic acid anhydride, and metal chlorides thereof. Water resistance, less
deformation due to temperature change, high heat resistance, and good workability can be
obtained.
[0021]
In particular, according to the present invention, it can be used for dust caps and also for sub
cones and tweeters which are particularly susceptible to deformation and whose mass increase
greatly affects performance, and a great effect can be obtained.
[0022]
In addition, ethylene-acrylic acid, ethylene-methacrylic acid etc. exist as what contains
monocarboxylic acid.
Examples of those containing dicarboxylic acid include ethylene, ethyl acrylate, maleic acid and
the like.
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[0023]
Examples of the dicarboxylic acid anhydride include ethylene, ethyl acrylate, maleic anhydride
and the like.
The metal chlorides thereof include ethylene, methacrylic acid, metal salts of methacrylic acid,
metal salts of ethylene, ethyl acrylate, maleic acid and the like.
[0024]
Further, it also includes polyethylene and ethylene / vinyl acetate copolymer, ethylene / methyl
methacrylate copolymer followed by graft copolymerization of acrylic acid, maleic anhydride and
the like.
[0025]
The invention according to claim 3 is characterized in that the synthetic resin film layer
according to the invention according to claim 1 or 2 is formed by any one method of
thermocompression bonding and heat adsorption. It is a board.
[0026]
By forming the synthetic resin film layer by any one method of thermocompression bonding and
heat adsorption, it is possible to form a synthetic resin film layer having an easy and uniform
thickness.
[0027]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present
invention will be described with reference to the drawings.
In the present embodiment, a description will be made using a free edge diaphragm for a speaker
as the diaphragm for an electroacoustic transducer.
[0028]
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FIG. 1 is a cross-sectional view of a free edge diaphragm according to an embodiment of the
present invention.
In the figure, the free edge diaphragm 13 is composed of a diaphragm body 11 and an edge 12
bonded to the outer edge of the diaphragm body 11.
[0029]
The synthetic resin film layer 15 having a thickness of 25 to 45 μm is formed over the entire
area of the back surface of the free edge diaphragm 13.
Next, a method of manufacturing the free edge diaphragm 13 having the above configuration will
be described.
[0030]
(1) Ethylene / ethyl acrylic coat / maleic anhydride terpolymer resin is blended with 30% by
weight of polyethylene, and a synthetic resin film 20 having a thickness of about 35 μm is
produced by an extrusion molding method.
[0031]
(2)
After NBKP (softwood bleached kraft pulp) is made into a predetermined shape by a wet sheetforming method, press-dried, and punched to a predetermined size, the diaphragm main body 11
is manufactured.
The mass of the diaphragm main body 11 according to this embodiment is approximately 1.4 g.
[0032]
(3)
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The ether-based urethane foam is press-formed into a predetermined shape and punched into a
predetermined size to manufacture the edge 12.
(4) The diaphragm main body 11 and the edge 12 are bonded with a rubber adhesive to
manufacture the free edge diaphragm 13.
[0033]
After this, the apparatus shown in FIG. 2 is used.
In the figure, reference numeral 27 denotes a diaphragm receiving jig on which the free edge
diaphragm 13 is placed.
A plurality of suction pipelines 26 are formed between the surface of the diaphragm receiving jig
27 on which the free edge diaphragm 13 is placed and the chamber 25 formed in the lower part.
The air in the chamber 25 and the suction line 26 is suctioned through the suction holes 28 by a
suction pump (not shown).
[0034]
A clamp 24 that holds the synthetic resin film 20 and is capable of moving toward and away
from the diaphragm receiving jig 27 is provided on the diaphragm receiving jig 27.
Reference numeral 29 denotes a far infrared heater provided on the clamp 24 and heating the
synthetic resin film 20.
[0035]
(5)
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The free edge diaphragm 13 is placed on the diaphragm receiving jig 27.
(6) The synthetic resin film 20 is set on the clamp 24. (7) The far infrared heater 29 is energized
to heat the synthetic resin film 20 for about 4 seconds to soften it.
[0036]
(8) The synthetic resin film 20 is moved onto the free edge diaphragm 13 using the clamp 24,
and the air in the chamber 25 of the diaphragm receiving jig 27 and the suction pipe 26 is
sucked from the suction hole 28 by a vacuum pump not shown. The synthetic resin film 20 is
closely attached on the back surface of the free edge diaphragm 13.
[0037]
(9) In order to firmly attach the synthetic resin film 20 onto the free edge diaphragm 13, after
stopping the vacuum adsorption, heating with a far-infrared heater 29 for about 20 seconds, the
synthetic resin film layer on the back surface of the free edge diaphragm 13 Form 15
[0038]
(10)
The inner diameter and the outer diameter of the free edge diaphragm 13 are punched to
predetermined dimensions.
According to the above configuration, after bonding the diaphragm main body 11 and the edge
12, the synthetic resin film layer 15 is formed over the entire area of the back surface of the free
edge diaphragm 13, thereby forming a film layer on the edge 12 alone. In this case, the shaperetaining property of the edge 12 is improved, and the deformation can be suppressed.
[0039]
Further, since the end face of the edge 12 and the end face of the diaphragm main body 11 are
also covered with the synthetic resin film layer 15, the entry of water from the end face is
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9
eliminated and the waterproofness is improved.
Furthermore, since the formation of the synthetic resin film layer 15 is completed in one step,
the cost can be reduced as compared with forming the film layers on the diaphragm main body
11 and the edge 12 respectively.
[0040]
Further, by setting the thickness of the synthetic resin film layer 15 to 25 to 45 μm, it is
possible to obtain the free edge diaphragm 13 which is less in deformation and excellent in
waterproofness. The present invention is not limited to the above embodiment.
[0041]
(1)
Although the synthetic resin film layer 15 is formed over the entire back surface of the free edge
diaphragm 13 in the above embodiment, it may be formed over the entire surface of the free
edge diaphragm 13 as shown in FIG. . Furthermore, as shown in FIG. 3 (b), the synthetic resin
film layer 15 may be formed over the entire front and back surfaces of the free edge diaphragm
13.
[0042]
(2) Although the thickness of the synthetic resin film layer 15 of the above embodiment is 35
μm, if it has a thickness in the range of 25 to 45 μm, the free edge diaphragm 13 with little
deformation and excellent waterproofness is obtained. Can.
[0043]
(3) In the embodiment described above, the synthetic resin film 20 is heat-adsorbed to the free
edge diaphragm 13 using the apparatus shown in FIG. 2 to form the synthetic resin film layer 15,
but an apparatus as shown in FIG. The synthetic resin film layer 15 may be formed by
thermocompression bonding using
[0044]
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10
In FIG. 4, reference numeral 37 denotes a diaphragm receiving jig on which the free edge
diaphragm 13 is placed.
A plurality of exhaust pipelines 36 are formed between the surface of the diaphragm receiving jig
37 on which the free edge diaphragm 13 is placed and the chamber 35 formed in the lower part.
Further, the chamber 35 is opened to the outside through the exhaust port 38.
[0045]
On the diaphragm receiving jig 37, a clamp 34 for holding the synthetic resin film 20 and
capable of approaching / separating to the diaphragm receiving jig 37 is provided. An air heating
/ pressing jig 40 is provided on the clamp 34 and is placed on the diaphragm receiving jig 37
with the synthetic resin film 20 interposed therebetween.
[0046]
The air heating / pressurizing jig 40 is provided with a heater 41 for heating the internal air, and
further, pressurized air from a blower (not shown) is introduced into the inside through the
intake hole 42. There is.
[0047]
Heat insulating materials 43 and 44 are provided on the upper portion of the diaphragm
receiving jig 37 and the lower portion of the air heating / pressing jig 40.
The operation of this apparatus will be described. The synthetic resin film 20 set in the clamp 34
is placed on the diaphragm receiving jig 37, and the air heating and pressing jig 40 is placed
thereon.
[0048]
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11
Then, the heater 41 is energized to drive the blower to introduce pressurized air into the air
heating / pressurizing jig 40. The introduced pressurized air is heated by the heater 41 to soften
the synthetic resin film 20, and the synthetic resin film 20 is thermocompression-bonded to the
back surface of the free edge diaphragm 13.
[0049]
(5) In the above embodiment, the synthetic resin film layer 15 is made by blending 30% by
weight of polyethylene with ethylene-ethyl acrylic coated-maleic anhydride terpolymer resin, but
monocarboxylic acid, dicarboxylic acid It may be a material obtained by blending 1% to 40% by
weight of polyethylene with an ethylene-based copolymer resin containing dicarboxylic acid
anhydrides and metal chlorides thereof.
[0050]
EXAMPLE The inventors of the present invention formed various types of synthetic resin film
layers over the entire back surface of the free edge diaphragm 13 in order to confirm the effects
of the present invention, and the workability, initial characteristics, 80.degree. The evaluation
test of waterproofness and deformation degree at 110 ° C. was conducted.
The results are shown in FIG.
[0051]
The initial characteristics refer to the conditions before the forced deterioration test such as the
heat resistance test, that is, the characteristics before being affected by the environment and
aging. Further, the heat resistance of 80 ° C. is a heat resistant temperature applied for home
use, and in the case of failure at this temperature, it is not possible to use even for home use.
[0052]
Furthermore, the heat resistance of 110 ° C. is a heat resistant temperature applied to
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12
automotive use, and in the case of failure at this temperature, it can not be used for automotive
use. In addition, the test method of waterproofness tested using the apparatus as shown in FIG. In
the figure, between the lower cylinder 100 and the upper cylinder 110 sealed by the packings
101 and 102, the free edge diaphragm 13 having the synthetic resin film layer 15 formed over
the entire back surface is disposed. Tap water was injected so that the water depth (H) was 20
mm, and the appearance of water after standing for 24 hours was evaluated. The judgment
criteria were disqualified if water leaked to the surface of the free edge diaphragm.
[0053]
In the test of the degree of deformation, the degree of deformation after leaving the free edge
diaphragm 13 in 50 ° C., 90% RH for 3 hours and then in 20 ° C., 65% RH for 1 hour was
evaluated. As for the judgment criteria, it was judged as acceptable if the dimensions of each part
were within the tolerance, and rejected if any one was deviated.
[0054]
In the heat resistance test, the free edge diaphragm 13 was left in a constant temperature bath
set to a predetermined temperature for 96 hours to evaluate the waterproofness and the degree
of deformation. The determination criteria were the same as in the case of the degree of
deformation.
[0055]
As can be seen from FIG. 5, the usable film thickness is 25 μm to 45 μm, and preferably 30 to
40 μm in consideration of in-vehicle use where high heat resistance is required. In addition,
those using the resin of the present invention (ethylene-based terpolymer + polyethylene) have a
wide range of film thickness that passes the comprehensive evaluation, and considering various
variations at the time of mass production, others Compared to, it is possible to provide more
stable products.
[0056]
Furthermore, with the same function, the film thickness can be reduced, and as a result, the
diaphragm weight can be reduced, which can contribute to the improvement of the speaker
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13
performance.
[0057]
As described above, according to the first aspect of the present invention, by setting the
thickness of the synthetic resin film layer to 25 to 45 μm, there is little deformation, and for the
electro-acoustic transducer having excellent waterproofness. A diaphragm can be obtained.
[0058]
According to the second aspect of the invention, the synthetic resin film layer comprises 1% to
40% by weight of polyethylene in an ethylene copolymer resin containing monocarboxylic acid,
dicarboxylic acid, dicarboxylic acid anhydride and metal chlorides thereof. By using a blended
material, it is possible to obtain good waterproofness, little deformation due to temperature
change, high heat resistance, and good workability.
[0059]
According to the third aspect of the present invention, the synthetic resin film layer can be
formed easily and uniformly in thickness by forming the synthetic resin film layer by any one
method of thermocompression bonding and heat adsorption. .
[0060]
Brief description of the drawings
[0061]
1 is a cross-sectional view of the free edge diaphragm of the embodiment of the present
invention.
[0062]
2 is a block diagram of an apparatus used when forming the synthetic resin film layer shown in
FIG. 1 by the heat adsorption method.
[0063]
3 is a configuration diagram for explaining another embodiment.
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[0064]
4 is a block diagram of an apparatus used when forming the synthetic resin film layer shown in
FIG. 1 by the heat pressure bonding method.
[0065]
5 is a diagram showing the results of the evaluation test in the embodiment of FIG.
[0066]
6 is a block diagram of the device used for the waterproof test in the embodiment.
[0067]
7 is a cross-sectional view of the free edge diaphragm.
[0068]
FIG. 8 is a cross-sectional view of an essential part of a conventional free edge diaphragm having
waterproofness.
[0069]
FIG. 9 is a cross-sectional view of a conventional free edge diaphragm having waterproofness.
[0070]
Explanation of sign
[0071]
11 diaphragm body 12 edge 13 free edge diaphragm (diaphragm for electroacoustic transducer)
15 synthetic resin film layer
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