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JPS63256099

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DESCRIPTION JPS63256099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for an acoustic output device or the like. In recent years, in the audio
characteristics of cassette tape recorders, microcassette tape recorders, and high fidelity stereo
speakers in the audio output equipment industry, speakers having better output sound pressure,
distortion rate, and flatness than in the past are desired. Speaker diaphragms, which influence
the acoustic characteristics, are increasingly regarded as important. The operation of the abovedescribed conventional speaker will be described below. The speaker is composed of a vibration
system such as a diaphragm, a voice coil bobbin, and a voice coil, and a magnetic circuit system
including a magnet, a pole, a plate, and a yoke. When a voice current flows in the voice coil in a
uniform magnetic field, a vertical electromagnetic force is generated in the voice coil and vibrates
according to the current. This vibration is correctly transmitted to the vibration of the diaphragm
and emitted as a sound wave (for example, Hisao Hayasaka: Introduction to Acoustics, Nikkan
Kogyo Shimbun). Problems to be solved by the invention However, although it is ideal that the
diaphragm of the speaker moves in a piston over the frequency band to be used, sound pressurefrequency characteristics when divided vibration occurs in which the diaphragm is deformed
during vibration The distortion factor, the phase characteristics, etc. deteriorate, which hinders
high fidelity reproduction. In addition, the conventional paper cone diaphragm and plastic
diaphragm have a low E / ((where E: elastic modulus, 二 two density) of the diaphragm material,
so the high region resonance frequency is low and the speaker is reproduced to high region
There was a drawback that it was impossible. SUMMARY OF THE INVENTION In view of the
above problems, the present invention provides a speaker diaphragm having a high highresonance frequency without causing deformation of the diaphragm or causing divided vibration
during vibration. Means for Solving the Problems In order to achieve this object, the speaker
diaphragm of the present invention uses a molded product in which a phenol derivative urushiol
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is coated on a plastic film and transferred to pulp as the diaphragm. In the present invention, the
elastic modulus is very large due to the above configuration, and when this is used as a
diaphragm, the flexural rigidity of the diaphragm is very large, and the diaphragm is deformed or
divided during vibration. There is no resonance. In addition, since kraft pulp is used as a base
material and the above-mentioned urushiol is laminated thereon, the specific elastic modulus E /
ρ (However, E: elastic modulus, ρ: heavy density is large, and this is used as a diaphragm) In
this case, the reproduction band of the speaker is extended, and a speaker having excellent sound
pressure-frequency characteristics, distortion rate, and phase characteristics can be obtained.
Moreover, since this diaphragm material uses urushiol, which is a phenol derivative, as a
laminate, it is excellent in solvent resistance, water resistance, and heat resistance, so it
withstands the use of the speaker under very severe power conditions. . EXAMPLE Hereinafter, a
speaker diaphragm according to an example of the present invention will be described. The
speaker in one embodiment of the present invention uses a diaphragm in which a phenol
derivative urushiol is coated on a plastic film and transferred to pulp. The diaphragm is fixed to a
voice coil bobbin, and a voice coil provided at the tip of the voice coil bobbin is inserted into the
magnetic gap of the magnetic circuit. The operation of the loudspeaker configured as described
above will be described below. The speaker is composed of a vibration system such as a
diaphragm, a voice coil bobbin, and a voice coil, and a magnetic circuit system including a
magnet, a pole, a plate and a yoke. When a voice current flows in the voice coil in a uniform
magnetic field, a vertical electromagnetic force is generated in the voice coil and vibrates
according to the current. This vibration is correctly transmitted to the vibration of the diaphragm
and emitted as a sound wave. Next, the method of producing the diaphragm is described.
Urushiol, which is a phenol derivative, is coated on a polyester film having a thickness of 100
μm to a thickness of 60 μm, and cured to a B-stage state under conditions of temperature 80 ′
′ C1 hour 305 m. Thereafter, this film is transferred to a fabric weight 262 / -kraft pulp at a
temperature of 100 'C1 and a pressure of 10- / d for 1 hour and formed to form a dome-shaped
diaphragm having a diameter of 30 m. As described above, according to the present embodiment,
the speaker using the diaphragm transferred to the pulp after coating urushiol, which is a phenol
derivative, on the pulp does not cause deformation of the diaphragm or split resonance and good
acoustic characteristics The distortion factor can be reduced by 2 a dB as compared with the
aluminum dome-shaped diaphragm of the same shape. Moreover, the high region resonance
frequency could be raised to 32 from 21 songs. In addition, the peak dip of the output sound
pressure can also be reduced by about ± 3 dB as compared to the aluminum diaphragm by ± 3
dB. Effect of the Invention As described above, according to the present invention, a molded
product obtained by coating a plastic film with ruurushiol, which is a phenol derivative,
transferred to pulp is used as a diaphragm, which has a small distortion factor and high
resonance frequency. It is possible to obtain a speaker having high sound output and a large
sound output, and to realize an excellent speaker having good sound characteristics.
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