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JPS58107795

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DESCRIPTION JPS58107795
[0001]
The present invention relates to an electroacoustic diaphragm. The conventional electroacoustic
diaphragm obtained by impregnating a single mica flake piece alone with a thermosetting resin
and then subjected to a curing treatment has an excellent elastic modulus. Since the internal loss
is extremely small, the difference in peak dip in the high frequency range of the 9-frequency
sound pressure characteristics is large, and there is a defect that sound pressure distortion is
likely to occur. The present invention provides an electroacoustic diaphragm which ameliorates
the above-mentioned drawbacks. This company has a large internal loss and a suitably large
modulus of elasticity, as compared with the conventional electroacoustic diaphragm using a
single mica scale piece, so that the difference in peak dip in the high region of the frequency
sound pressure characteristic is small and the characteristic is flat It is an electro-acoustic
diaphragm with high elongation in the high region. The present invention relates to an
electroacoustic diaphragm in which a mica flakes and an inorganic short fiber or an organic
fibrid are mixed to form a sheet, and a thermosetting resin composition or a photocurable resin
composition is impregnated and cured. As the mica flakes, those having a size in the range of
usually 6 to 400 mesh and obtained by beating unfired mica or synthetic mica or the like with a
water jet or the like are used, and those of 32 to 200 mesh are preferred. Glass chops, asbestos
and carbon graphite are used as mineral short fibers. As the organic fibrids, aromatic polyamide
fibrids, polyamidoimido fibrids, booli 2 dofibrit, etc. are used. An electroacoustic diaphragm that
is particularly preferable when using an aromatic polyamide fibrid is obtained. The inorganic
short fibers or the organic fibrids are preferably in the range of 0.5 to 15% by weight with
respect to the mica flakes. The electric sound 41S moving plate is mixed with mica flakes and
inorganic short fibers or organic fibrids and formed into a dome or cone shape, and then
impregnated with a thermosetting resin composition or a photocurable resin composition. It is
obtained by curing the resin by heat or heat. In order to obtain an electroacoustic diaphragm, it is
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formed into a sheet as a mica flake, and a thermosetting resin or a photocurable resin
composition is incorporated into the sheet, and then molded into a shape of an electric paper
diaphragm and then a thermosetting resin composition Or the photocurable resin composition
may be cured by heat or light. When curing the thermosetting resin composition, it is preferable
to apply pressure. It is preferable that the thermosetting resin composition cures after being
impregnated and hardens after molding. The thermosetting resin composition is not particularly
limited. For example, a composition containing an epoxy resin and a curing agent, a composition
containing an unsaturated polyester resin and a curing agent, a composition comprising a
silicone resin and a curing agent, and the like are used.
The photocurable resin composition is not particularly limited, and is a compound having a
photopolymerizable double bond group in the molecule. For example, a composition containing
an acrylic ester of an alcohol or a methacrylic ester, a photopolymerization initiator such as
benzophenone, anthraquinone, Michler's ketone, or a benzoin alkyl ether is used. Both a
thermosetting resin composition and a photocurable resin composition may be used. In addition,
Erosil, calcium carbonate in these resin compositions. You may contain inorganic substances,
such as Merck and titanium. The electroacoustic diaphragm according to the present invention is
lightweight, has a large internal loss, and has a suitably large modulus of elasticity of 9 and
excellent mechanical strength. The present invention will be described in detail. Example 1
Baking of squid by water jet and classified into mica flakes of 32 to 120 mesh with aromatic
polyamide fibrids mixed with 7 folds of aS of mica flakes and formed into a sheet thickness of
about 0.1 ■ A mass of 140 f / c In ′ ′ ml mica sheet (manufactured by Nippon Aroma Co.,
Ltd., trade name AMO-140), epoxy resin Ep 828 (manufactured by Shell Co., Ltd.) 50, 1iJi part
and epoxy resin DEN 438 (manufactured by Taw Chemical Co., Ltd.) 50 Impregnate 5 parts by
weight of boron trifluoride monoethylamine added to the parts by weight so that the content
becomes 30 × −jlk%, and heat cure at 80 ° C. for 24 hours to semi-cure it And a prepreg sheet.
The prepreg sheet was heat and pressure molded using a cone-shaped mold ball having a
diameter of 12 c1 n at 200 ° C., 55 kC 4 f / m, 2 minutes to obtain an electroacoustic
diaphragm. Example 2 A glass chop (tossed with ± 7 Aino (product name: FE8-03-0408) is used
as a mica flake in a mica flake of 16 to 200 mesh which is classified by beating a green mica with
water jet and classifying. The mixed mica sheet having a thickness of about 0.13 and a mass FII
of 60 f / m ′ ′ was mixed in an amount of 1.5% by weight, used in Example 1, and the content
of the resin composition was used. It was impregnated to 25 wt- and dried at 100 ° C. for 30
minutes to obtain a prepreg sheet. This prepreg sheet was heat pressed under the same
conditions as in Example 1 using a dome-shaped mold with an aperture of 10α to obtain an
electroacoustic diaphragm. The frequency sound pressure characteristics of the single 12
speakers using this electric sound 41 diaphragm are shown in FIG. A person shows the
characteristic of the speaker using the electroacoustic diaphragm of the present embodiment,
and B shows the characteristic of the nine speaker using the electric sound writing diaphragm
obtained in the comparative example.
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Example 3 A glass chop (a product made by Fuji Fibers Co., Ltd., trade name FES-03-0408) was
divided into 0.8 to 12 parts of mica flakes, which was classified by refining the crushed mica with
a water jet and classifying it. Weight% mixed friend. A cone-like laminated mica sheet obtained by
forming this into a corn-like net as a photocurable resin composition, 60 weight parts of glycidyl
acrylate, Eboki 7 resin reactive diluent Cardura E (made by Shell Chemical Co., Ltd.) 40 weight
The resin composition was cured by irradiation with a part and a photopolymerization initiator
for a second to obtain an electroacoustic diaphragm. Comparative Example The fired mica was
beaten with a water jet and classified to give a mica scallop of 32 to 120 Mw / y. This is Ep 828
(Shell Chemical Company fR) so parts by weight. 50 parts by weight of DEN 438 (Dow Chemical
Co., Ltd.) as a Brigreg sheet, then heat and pressure molded under the conditions of 200 ° C. 55
Kyf / m ′ ′ for cone-shaped gold W't − with an aperture of 12 z and 2 minutes An
electroacoustic diaphragm was obtained. The characteristics of the electroacoustic diaphragm
obtained above were measured, and the results are shown in Table 1. As shown by the results in
Table 1 below, the electroacoustic diaphragm according to the present invention has a large
internal loss as compared with the electroacoustic diaphragm obtained by using a conventional
mica scale piece alone. Since the modulus of elasticity and E / が are moderately large, the peak
dip in the high region is also small in the 9-frequency sound pressure characteristics as shown in
ts1 and even in the high region since the high region limit frequency (fh) reaches approximately
the same extent It is a flat, well-stretched electroacoustic diaphragm.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a diagram showing the frequency sound pressure characteristics of a speaker using a
Tokubo electric sound recording diaphragm according to an embodiment of the present
invention and a speaker using an electric acoustic diaphragm obtained according to a
comparative example.
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