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JPS62289097

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DESCRIPTION JPS62289097
[0001]
The present invention relates to a speaker diaphragm used as an acoustic output device. 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.
Hereinafter, an example of the above-described conventional speaker will be described with
reference to the drawings. FIG. 2 shows a cross-sectional view of a vibration system of a
conventional speaker. In FIG. 2, 1 is a diaphragm, 2 is a voice coil bobbin whose tip is fixed to the
diaphragm 1, and 3 is a voice coil inserted into a magnetic gap (not shown) of a magnetic circuit.
The operation of the loudspeaker configured as described above will be described below. As
shown in FIG. 2, the speaker is excited by a vibration system such as the diaphragm 1, the voice
coil bobbin 2 and the voice coil 3 and a magnetic circuit system (not shown) consisting of
magnets, balls, plates and yokes. When a voice current flows in the voice coil 3 in one of various
magnetic fields, an electromagnetic force in the vertical direction is generated in the voice coil 3
and vibrates according to the current. This vibration is correctly transmitted to the vibration of
the diaphragm 1 and emitted as a sound wave (for example, Hisao Hayasaka: Introduction to
acoustics and Nikkan Kogyo Shimbun) 0 Problems to be solved by the invention The diaphragm
of the speaker is a piston over the frequency band It is considered that movement is ideal, and if
the diaphragm is deformed during vibration or split vibration occurs, the sound pressurefrequency characteristics, distortion rate, phase characteristics, etc. are degraded, which hinders
high fidelity reproduction. Since conventional paper cone diaphragms and plastic diaphragms
have small E / ρ (where E: elastic modulus, :: density) of the diaphragm material, the highresonance frequency is low and the loudspeaker It has the disadvantage that it can not be
regenerated. SUMMARY OF THE INVENTION In view of the above problems, the present
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invention provides a speaker diaphragm having a high high-resonance 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
comprises a sheet coated with amorphous carbon on one side of a prepreg made of scale-like
mica and an epoxy resin, as well as compression molding The formed product is used as a
diaphragm. Function According to the present invention, according to the above-mentioned
constitution, the sheet-like laminate is composed of a composite of scaly mica having a very large
modulus of elasticity and an epoxy resin, and amorphous carbon having a further large modulus
of elasticity. However, it is possible to obtain a speaker having excellent sound pressurefrequency characteristics, distortion rate, and phase characteristics, since the diaphragm is not
deformed during vibration, and split resonance does not occur.
It is possible to process it into an arbitrary diaphragm shape by using a method in which a
prepreg is compression-molded to produce a diaphragm. Not only this flat plate-shaped
diaphragm, but also a dome-shaped diaphragm can be freely processed, and arbitrary acoustic
characteristics can be obtained. Embodiment Hereinafter, a speaker diaphragm according to an
embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a
cross-sectional view of a loudspeaker according to an embodiment of the present invention. In
FIG. 1, 4 is a diaphragm made of amorphous carbon coated 7-to is laminated on one side of a
prepreg made of scaly mica and epoxy resin, and a compression molded diaphragm, 6 has its tip
fixed to the diaphragm 4 The voice coil bobbin 6 is a voice coil inserted into the magnetic gap
(not shown) of the magnetic circuit. The operation of the loudspeaker configured as described
above will be described below. As shown in FIG. 1, the speaker comprises a vibration system such
as a diaphragm 4, a voice coil bobbin 5 and a voice coil 6 and a magnetic circuit system (not
shown) consisting of a magnet, a pole, a plate and a yoke. When a voice current flows in the voice
coil 6 in a uniform magnetic field, an electromagnetic force in the vertical direction is generated
in the voice coil 6 and vibrates according to the current. This vibration is correctly transmitted to
the vibration of the flat diaphragm 4 and emitted as a sound wave. The method of manufacturing
the diaphragm 4 will be described below. A prepreg made of scaly mica and an epoxy resin as a
diaphragm material (a scaly mica formed into a sheet by a paper-making method and then dried
and impregnated with a mixed solution of an epoxy resin and toluene after drying is referred to
as a prepreg. The compounding ratio was adjusted so that a film thickness might be set to 20
micrometers, after shape ¦ molding with scale-like mica 706 degree-wt% and epoxy resin 30 wt%.
A sheet of 1000 amorphous carbon coated by the cvn method (chemical vapor deposition
method) was used on one side of. After three layers of this sheet were laminated, a molded
product formed into a dome shape (a dome diameter of 30 m + n) under conditions of a
temperature of 150 ° C1 and a pressure of 20 kg / c4 for 20 minutes by compression molding
was used as a diaphragm. As described above, according to the present embodiment, the speaker
using the diaphragm 4 in which the sheet coated with amorphous carbon is laminated on one
side of the prepreg made of scale-like mica and epoxy resin and is compression-molded is very
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elastic. The laminate of amorphous carbon with a large modulus of elasticity and a composite of
scale-like mica and epoxy resin with a high rate of freedom does not cause deformation of the
diaphragm and split resonance, and good acoustic characteristics can be obtained. The distortion
factor is reduced by 20 dB as compared to the dome-shaped diaphragm.
The high-side resonance frequency rises to 31 KHz from 21 KIlz, and the output sound pressure
rises by about 37 · \ dB because the diaphragm becomes lightweight. Effect of the Invention As
described above, according to the present invention, a sheet coated with amorphous carbon is
laminated on one side of a prepreg made of scaly mica and an epoxy resin, and a compressionmolded product is used as a diaphragm. It is possible to obtain a speaker having a small rate, a
high high-resonance frequency, and a large acoustic output, and an excellent speaker having
good acoustic characteristics can be realized.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a vibration system of a loudspeaker according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view of a vibration system of
a conventional loudspeaker.
4 ··· Diaphragm, 5 ······ Voice coil bobbin, 6 ······ Voice coil. Name of the agent 'patent attorney
Nakao Toshio Other 1-4-motion slave-3-1-chair, Ill]
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