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JPH01135297

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DESCRIPTION JPH01135297
[0001]
The present invention relates to a diaphragm of a speaker which is an audio device and a method
of manufacturing the same, and more particularly, a vibration in which a high frequency
resonance frequency (fh) which is a high limit of a reproduction band is increased to expand a
reproduction band It relates to a board, a method of manufacturing the same. (Conventional art
and its problems) Conventionally, natural fibers such as natural pulp, metals, polymer films and
the like have been used as diaphragm materials for electroacoustic devices. However, natural
fibers are highly hygroscopic, and thus have a drawback that they have poor moisture resistance
as a diaphragm. Although metals such as aluminum and beryllium have high moisture resistance
and heat resistance and high modulus of elasticity, they have a disadvantage that good frequency
characteristics can not be obtained because the internal loss is small. Furthermore, polyethylene
terephthalate generally used as a polymer film diaphragm material has a low elastic modulus, has
poor heat resistance and adhesion, and polyimide has high heat resistance, but has the
disadvantage of poor adhesion. (Means for Solving the Problems) The present invention has been
proposed to ameliorate the above-mentioned drawbacks, and the object of the present invention
is to provide a sound with high modulus, high heat resistance, and excellent adhesion. Equipment
Vibration! I) To provide a root and its production method. (Function) The present invention is
characterized in that an aromatic polyamide resin having a large elastic modulus is used as a
diaphragm, and since this resin has a large elastic modulus, a high band resonance frequency (f h
l) which is a high limit of the reproduction band. As a result, the regeneration band can be
expanded. Also, heat resistance and adhesion are considered to be excellent. (Example) Generally,
the diaphragm material for electroacoustic equipment has a low density to improve the output
sound pressure level, flattens the sound pressure to frequency characteristics, and has a large
internal loss to reduce distortion due to divided vibration. And is favored to have a high modulus
of elasticity to expand the regeneration zone. Further, for bonding to a voice coil, an edge, and a
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frame, it is necessary to be excellent in adhesiveness, naturally easy to be formed and processed,
and excellent in mass productivity. Therefore, in the present invention, a diaphragm for a speaker
is obtained by molding an aromatic polyamide having the above conditions, or a copolymer or a
composite mainly composed of an aromatic polyamide. As a composite, for example, a composite
film in which a carbon graph eye] to 30 vt% is added to a copolymer mainly composed of an
aromatic polyamide is obtained. Table 1 shows the comparison between the physical properties
of the aromatic polyamide and the physical properties of P1 = T (polyethylene terephthalate),
which is relatively often used as a diaphragm material, and polyimide.
In the production of the first table, after forming an aromatic polyamide, or a copolymer
containing an aromatic polyamide as a main component, or a composite into a film, it is
processed into a desired diaphragm shape using a molding die. Manufactures diaphragms. Then,
a diaphragm for high frequency range reproduction with an aperture of 25 u + was made on a
trial basis by the above-mentioned manufacturing method. The material of the diaphragm is an
aromatic polyamide, a copolymer containing an aromatic polyamide as a main component, or a
composite, which is formed into a film by vacuum or compressed air, and then molded and
processed using a molding die. It is a thing. FIG. 1 shows the results of comparison of frequency
characteristics by producing diaphragms of the same shape using polyethylene terephthalate 1film of the same thickness. A is a conventional example of polyethylene terephthalate, B is a
speaker using the diaphragm of the present invention, and it can be seen that the high frequency
resonance frequency (fh) is expanded according to the mouth. Further, the surface tension of the
film surface was increased from 45 dyne / cm to 72 dyne / cm or more by activating the surface
of the film of the present invention by corona discharge or plasma treatment on one side or both
sides. As a result, good adhesion properties were obtained, and no abnormality was found in the
input-proof operation test using a speaker using quartz. (Effects of the Invention) As described
above, according to the present invention, an aromatic polyamide, or a copolymer mainly
composed thereof, or a composite is used as a diaphragm material, and after it is formed into a
film, it is formed Since the diaphragm material according to the present invention has a large
elastic modulus, it is possible to increase the high-resonance frequency (fl), and thus the
reproduction band is expanded. And the heat resistance is good. Further, by activating the film
surface, it is possible to obtain good adhesion.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 shows the frequency characteristics with respect to sound pressure comparing the product
of the present invention and the conventional example.
A · · · Conventional example, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · 12 Method 3, Relationship with the person making correction Patent
applicant name Foster Electric Co., Ltd. 4 即 〒 160 residence Nishi-Shinjuku 3-23rd No. 603
Famil Nishi-Shinjuku, Shinjuku-ku, Tokyo Target object of correction On page 5, line 10 of the
specification, correcting “in a film by vacuum or compressed air” is corrected to “in a film”.
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