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Description 1, title of the invention
Diaphragm for audio equipment
3. Detailed Description of the Invention The present invention relates to a diaphragm for audio
equipment, the object of which is to be processed easily, at low cost, and capable of mass
production, and to broaden the sound pressure reproduction frequency. Providing a diaphragm
for an audio device capable of In general, cone paper is mainly used as a speaker diaphragm, and
cone paper, vapor dome, a composite of cloth and resin, polyester film, etc. are mainly used for
small diameter speakers such as tweeters and headphones. ing. Although these diaphragms are
used according to the purpose, they have advantages and disadvantages. For example, polyester
films etc. have good film properties but have high elastic modulus and need to be reproduced
with a single speaker from low to high frequencies. Small speakers for headphones, radio
receivers, tape recorders etc. It is necessary to use a thin film in order to reduce the need. When
a thin film is used, there is a defect that causes an increase in split resonance and causes
distortion. The present invention solves such conventional drawbacks, and forms a diaphragm of
a copolymer of propylene and ethylene copolymer having a content of ethylene of 2 to 16% or a
copolymer thereof. It is a thing. According to such a vibration plate, the propylene / t-ethylene O
copolymer or composite can change its modulus of elasticity from about 9 / -about 9 /-to 250/9
/ m. Resonant frequency f. In the present invention, it is possible to widen the sound pressure
reproduction frequency as the frequency band of the speaker can be completely reduced. In
particular, by changing the ethylene content in the range of 2 to 16 inches, it is possible to
control the lowest resonance frequency fO, and has the advantage of being able to increase the
degree of freedom in speaker design and increase EndPage: 1. Take bamboo. If the ethylene
content exceeds 16%, the diaphragm becomes very soft 9, in-plane resonance or rolling
phenomenon occurs, giving undesirable results to the acoustic characteristics. In addition, when
the ethylene content is still not at 2%, it does not significantly contribute to the result of
reduction of the lowest resonance frequency fO, which is meaningless. Hereinafter, an
embodiment of the present invention will be described. [Example] A block copolymer of
propylene and ethylene is mixed with 10% α-olefin per 100 parts of a polymer (Ml = 8) having
an ethylene content of 6.1%, and mixing is performed using an extruder. Created a beret. Using a
film forming machine, 40 μ, 60 μ A film of 60 μ was prepared, and the film was subjected to
corona discharge treatment at a frequency of 110 KHz and a voltage of 6 KV, and a solution
consisting mainly of chloroprene and alkylphenol was coated on the surface to form a 1 μ to 1.2
μ layer.
The elastic modulus of the film thus produced was 37ookq, / = and tan δ was o, 14. The
formation of the diaphragm was performed as follows. A dome-shaped vacuum forming mold was
prepared, and the surface was subjected to surface roughening using a 180-mesh carborundum
to perform vacuum forming. The diaphragms having a diameter of 26 M were produced using
the diaphragms thus produced. The result of examining the frequency characteristics by
preparing a diaphragm of the same shape using a polyester film of the same thickness is shown
in FIG. In FIG. 1, A is a conventional example and B is a characteristic of a speaker using the
diaphragm of this embodiment. Further, FIG. 2 shows the frequency characteristics of the
headphone speaker of 40 m in diameter created by the method of the present embodiment. In
FIG. 2, A is a conventional example, and B is a characteristic of a speaker using the diaphragm of
this embodiment. The relationship between the lowest resonance frequency fO and the ethylene
content is shown in FIG. 3 for the headphone speaker having a diameter of 4 CMm. As apparent
from FIG. 3, it is understood that the lowest resonance frequency fO can be controlled by
changing the ethylene content. Benzophenone and mercaptan as stabilizers. A diaphragm was
made according to the method of the above example by adding 1.0% each of the 5 芳香 aromatic
zone amine, and a deterioration test at 120 ° C. was performed by a weather-o-meter. It showed
a double life and was found to have no effect on the acoustic characteristics. Also, 7% of
chlorinated paraffin (30% of chlorine content) and 2 parts of antimony trioxide were added as a
flame retardant and the diaphragm was made according to the method of the above example,
resulting in a 3% increase in elastic modulus. Vibration diaphragm was obtained. The material
formed into a film was subjected to corona treatment and adhesion test with an aluminum plate
was carried out using a synthetic rubber adhesive. A straight of 1.8 kg / am was obtained. The
result of the test is as small as 974 to 0.3. However, before vacuum forming, a film consisting of
a mixture of neoprene and aliphatic phenol is formed on the surface of the film after forming
500A to 1μm, and the adhesion strength of the vacuum formed diaphragm is 1.7 to 2.2 to 9/9.
It became possible to give excellent adhesion with the side. When the surface of the vacuum
forming mold is roughened by sandblasting, the variation in film thickness of the formed
diaphragm is within ± 2%, which is more than 5% of the non-roughened mold. I found that I
could halve it. Since the vacuum forming is still possible, the main purpose efficiency can be
improved by about 8 times that of the conventional polyester.
As described above, according to the present invention, since a copolymer or composite of
propylene and ethylene having an ethylene content of 2 to 16% is formed, the minimum
resonance frequency fo can be reduced, and the sound can be reduced. A wide band of pressure
regeneration frequency can be achieved. Moreover, since the copolymer is a copolymer or a
composite of propylene and ethylene, the environmental characteristics of the diaphragm can
satisfy practical values for both heat resistance, radical resistance and endurance life, and the
elastic modulus of the diaphragm should be adjusted. This makes it possible to achieve greater
freedom in speaker design. Therefore, the sound quality of the speaker using the diaphragm of
the present invention is powerful and soft. The lightness, delicateness and balanced sound quality
can be obtained.
4. Brief description of the drawings. FIG. 1 is a diagram of the end page using the diaphragm for
audio equipment of the present invention: 2 P force and sound pressure frequency
characteristics of a conventional speaker, and FIG. 2 is a vibration for audio equipment of the
present invention. FIG. 3 is a graph showing the relationship between the lowest frequency and
the ethylene content of the headphone speaker using the board and the sound pressure
frequency characteristics of a conventional headphone and beaker for a headphone. Name of
agent Attorney Nakao Toshio Other 1 person C0 1 hand (gP1 dine 3 figure 4 leen turbid t ((X)
EndPage: 3
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