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JPH01109998

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DESCRIPTION JPH01109998
[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. 2. Related Art In recent years,
even in the audio characteristics of cassette tape recorders, microcassette digital coders, and
speakers as an audio output device in the high fidelity stereo industry, even more than before,
the flatness of output sound pressure, distortion factor and output sound pressure characteristics
An excellent speaker is desired, and a speaker diaphragm that influences the acoustic
characteristics is considered more and more important. The operation of the above-described
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 ball, a plate, and a yoke. When a voice current flows in a voice coil in a
magnetic field such as this, 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
pressure-frequency characteristics when the diaphragm is deformed or divided vibration occurs
during vibration The distortion factor, the phase characteristics, etc. are degraded, which hinders
high fidelity reproduction. Also, since the conventional paper cone diaphragm and plastic
diaphragm have a small g / ((where g = elastic modulus, ρ: density) of the diaphragm material,
the high frequency co-imaging frequency is low and the speaker is high frequency There was a
drawback that it could not be regenerated. SUMMARY OF THE INVENTION In view of the above
problems, the present invention provides a speaker diaphragm having a high high-resonance
frequency without any deformation of an imaging plate or occurrence of divided vibration during
vibration. Means for Solving the Problems In order to achieve this object, the speaker diaphragm
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of the present invention uses a molded product obtained by laminating and molding a
superconducting thin film on one side of a prepreg made of scaly mica and epoxy resin as a
diaphragm. It was In the present invention, due to the above-described configuration, the elastic
modulus is very large, and when this is used as the diaphragm, the bending rigidity of the
imaging plate is very large, and the diaphragm is deformed during vibration or split resonance
occurs. Absent. In addition, since a molded product obtained by laminating natural mica with a
very large elastic modulus and a superconducting thin film is used as a material, the specific
elastic modulus g / ρ (where E: elastic modulus, ρ: density) is large. When used as a diaphragm,
it is possible to obtain a speaker having an extended reproduction band and excellent sound
pressure-frequency characteristics, distortion rate, and phase characteristics.
In addition, since the superconducting thin film has a very large magnetic shielding ability, when
it is used as a diaphragm, it is particularly suitable for audio and visual equipment installed in the
vicinity of the speaker in order to block magnetic flux radiated from the front of the speaker.
There is no adverse effect. 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, as a diaphragm, a molded product obtained by laminating and molding a
superconducting thin film on one side of a prepreg made of scale-like mica and an epoxy resin.
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 ball, a plate, and a yoke. When a voice current flows in a
voice coil in a magnetic field such as this, 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 moving plate and emitted as a sound wave. Next, the method for producing the
diaphragm will be described. A laminate of a prepreg consisting of 70 parts of natural mica
(phlogopite mica 150 mesh path) and 30 parts of epoxy resin and a laminate of a ceramic
superconducting thin film of 20 μm temperature 100 ° C1 pressure 20 H / l * According to the
present embodiment, a superconducting thin film is laminated and molded on one side of a
prepreg composed of scaly mica and an epoxy resin as described above. A speaker using a
molded product as a diaphragm does not suffer from deformation of the diaphragm or split
resonance, and good acoustic characteristics are obtained, and the distortion factor is reduced by
20 (113 by comparison with the aluminum flat diaphragm of the same shape. Can. Also, the high
resonance frequency could be raised to 40 kHz from 21 kH2. In addition, the peak sound
pressure of the output sound pressure can also be lowered by about ± 3 dB as compared with
the aluminum diaphragm with ± 36 B. Also in the measurement of magnetic leakage, the front
1oa of the speaker! The leakage flux is 0.3 gauss at the distance I, which is a significant decrease
compared to the conventional aluminum split diaphragm of about 1.2 gauss. Effects of the
Invention As described above, the present invention uses a molded product obtained by
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laminating and molding a superconducting thin film on one side of a prepreg made of scaly mica
and an epoxy resin as an imaging plate, having a small distortion factor, and high frequency
resonance. A speaker having a high frequency and a large acoustic output can be obtained, an
excellent speaker having good acoustic characteristics can be realized, and magnetic leakage can
be significantly reduced by the superconducting thin film.
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