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JPS62289098

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DESCRIPTION JPS62289098
[0001]
The present invention relates to a speaker diaphragm used as an acoustic output device. 2.
Related Art In recent years, even in the acoustic characteristics of a cassette tape recorder, a
micro force cent tape recorder, and a speaker as an audio output device in the hi-fi stereo
industry, a speaker having an output sound pressure, distortion rate, and flatness better than
before. Desirably 9, the speaker diaphragm that influences the acoustic characteristics is
considered more and more important. Hereinafter, an example of the above-described
conventional speaker will be described with reference to the drawings. FIG. 2 shows a crosssectional 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 comprises a vibration
system such as a diaphragm 1, a voice coil bobbin 2 and a voice coil 3 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 3 in a uniform magnetic field, an electromagnetic force in the vertical
direction is generated in the voice coil 3, and the voice coil 3 picks up motion 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 Acoustic Engineering, Nikkan Kogyo
Shimbun). Problems to be solved by the invention It is ideal that the diaphragm of the speaker
moves in a piston over the frequency band to be used, and if the diaphragm is deformed or split
vibration occurs during vibration, sound pressure-frequency characteristics, distortion Rate,
phase characteristics, etc., and it interferes with high fidelity reproduction. ti。 Conventional
paper cone diaphragms and plastic diaphragms have a low E / p (where E: elastic modulus, ::
density) of the diaphragm material, so the high frequency resonance frequency is low and the
speaker can not reproduce to high frequencies. There was a drawback. SUMMARY OF THE
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INVENTION In view of the above problems, the present 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 has a three-layered sheet in which a
polyimide prepreg sheet is laminated on both sides of a polyamide prepreg sheet and is
laminated and bonded by thermoforming. The molded product is used as a diaphragm. In the
present invention, the surface material (surface, back surface) of the above-mentioned molding
has a large elastic modulus (about 1.3 times as large as that of paper with 6,2 × 10 10 dyne / −
paper) and a large mechanical internal loss in the core material Because it has a three-layer
structure made of polyamideimide (2.6 times that of polyester film at 0, 05), the bending rigidity
is very large due to the surface material, and the diaphragm is deformed during vibration or split
resonance In addition, since the core material has a large mechanical internal loss, it is possible
to obtain a speaker having excellent sound pressure-frequency characteristics, distortion rate,
and phase characteristics.
Since this diaphragm material is made of polyimide as a main component, it can be plastically
deformed by heat and pressure, and can be processed into any diaphragm shape by, for example,
a press or the like. For this reason, not only a flat diaphragm but also a dome diaphragm can be
freely processed, and arbitrary acoustic characteristics can be obtained. In addition, since the
material is made of a polyimide type, the heat softening temperature is very high, so the heat
resistance is excellent, and a speaker having a large input resistance characteristic 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 formed by a three-layer sheet heat press or the like in which a polyimide prepreg
sheet is bonded to both sides of a polyamide prepreg sheet, 6 is a voice coil bobbin with its tip
fixed to the diaphragm 4 and 6 is It is a voice coil inserted in 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 6, and a voice coil 6 and a magnetic circuit system (not shown)
consisting of a magnet, a ball, 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 diaphragm 4 and emitted as a sound wave. Hereinafter, a method of
manufacturing the diaphragm 4 will be described. First, a polyimide prepreg sheet of 20 μm was
used as a surface material, and a polyamideimide prepreg sheet of 80 μm was used as a core
material. This material was molded by heat pressing into a temperature of 260 ° C., a pressure
of 50 kg / C [II ”, and a time e o min (7) condition in the shape of a teme (dome diameter φ 3 o
mm) to obtain a diaphragm. As described above, according to the present embodiment, the
speaker using the diaphragm 4 in which the sheet of the three-layer structure in which the
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polyimide prepreg sheet is bonded to both sides of the polyamide prepreg sheet is formed by
heat press is The deformation and split resonance do not occur, so that good acoustic
characteristics can be obtained, and the distortion rate is reduced by 24 dB as compared with the
aluminum dome-shaped diaphragm of the same shape. In addition, the high-side resonance
frequency rises from 2 1 KHz to 2 s KHz, and the peak dip of the output sound pressure is also
lowered by about 3 dB compared to the aluminum diaphragm by about 3 dB.
Effects of the Invention As described above, the present invention uses, as a diaphragm, a molded
product in which a sheet having a three-layer structure in which a polyimide prepreg sheet is
bonded to both sides of a polyamide prepreg sheet is laminated and bonded by thermoforming
such as hot pressing. Thus, it is possible to obtain a speaker having a low distortion rate, a high
high-resonance frequency, and a large acoustic output, and to realize an excellent loudspeaker
having good acoustic characteristics.
[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 · · · · · · · · · · · · · · · · · · · · · · · · voice coil bobbin, 6 · · · · · · · · voice coil. Name of agent Attorney
Nakao Toshio and 1 other person Fig. 1 4-Periodic Jaw 5 "--Voice coil 6--1 nail 3 square j)
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