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JPS63246098

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DESCRIPTION JPS63246098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker used in 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 speaker is
composed of a vibration system such as a diaphragm, a voice coil bobbin, and a voice coil, and a
magnetic circuit system (not shown) including a magnet, a ball, a plate and a yoke. When voice
current flows through the voice coil in a uniform magnetic field, vertical force is generated in the
voice coil and vibrates. 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 the diaphragm is deformed or divided vibration occurs during
vibration The distortion factor, the phase characteristics, etc. deteriorate, which hinders high
fidelity reproduction. In addition, the conventional paper cone diaphragm and plastic stationary
plate have a low E / ρ (where E is the second elastic modulus, ρ: density) of the diaphragm
material, so the high region resonance frequency is low, and the speaker has a high region There
was a drawback that it could not be regenerated. SUMMARY OF THE INVENTION In view of the
above problems, the present invention is to provide a speaker diaphragm having a high highresonance frequency without causing deformation of the diaphragm or causing divided
photographing during vibration. Means for Solving the Problems In order to achieve this object,
the speaker diaphragm of the present invention is prepared by mixing kraft pulp, chitosan which
is deacetylated with natural polymer chitin and polyamide epichlorohydrin resin, The
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thermoformed sheet is used as an imaging plate. The diaphragm of the present invention
comprises a natural polymer material having a large elastic modulus, chitosan, a kraft pulp
having a large mechanical internal loss, and a polyamide / epichlorohydrin resin for causing a
cross-linking reaction of the two materials with an epoxy group. Unlike mixed paper and
conventional paper pulp, not only the entanglement of the fibers but also the fibers are
chemically bonded so that the strength is increased because they are mixed and thermoformed.
In addition, since mechanical internal loss is increased by the effect of kraft pulp, it is possible to
obtain a speaker having excellent sound pressure-frequency characteristics, distortion rate, and
phase characteristics with less deviation in frequency characteristics.
Furthermore, since the diaphragm material of the present invention uses a material having kraft
pulp as a main component, it can be manufactured by the conventional paper making method,
and therefore it is very excellent in mass productivity. EXAMPLE Hereinafter, a speaker
diaphragm according to an example of the present invention will be described. The speaker
diaphragm in one embodiment of the present invention is a sheetra formed by mixing and
molding kraft pulp, chitosan deacetylated with a natural polymer chitin, and a polyamide /
epichlorohydrin resin having an epoxy group. Hereinafter, a method of manufacturing the
speaker diaphragm of the present embodiment will be described. First, kraft pulp and a solution
(3% solid content) of chitosan deacetylated with chitin, which is a natural polymer, dissolved in a
weakly acidic solution are mixed so that the weight ratio to solid weight is 5 wt%, Further, the
epichlorohydrin polyamide resin solution was mixed so as to have a solid content and a weight
ratio of pulp to 3 wt%, to make a paper by a round netting method, and thereafter heat treated at
130'C for 10 minutes and simultaneously formed into a diaphragm shape. The physical
properties of the diaphragm molded as described above became large even when the elastic
modulus of the diaphragm was when the mixing ratio of chitosan was Swt% and the
epichlorohydrin polyamide resin was 3 wt%. In addition, if the mixing ratio is further increased,
the density is increased and the specific elastic modulus is decreased. In actual use, adjustment
can be made arbitrarily by selecting the mixing ratio in accordance with the physical properties
required of the diaphragm. As described above, according to the present embodiment, a
diaphragm formed by mixing paper of chitosan and polyamide / epichlorohydrin resin
deacetylated with kraft pulp and natural polymer and heat-formed is a conventional paper cone
diaphragm. In contrast, since the fibers are chemically bonded to each other, the rigidity becomes
a cylinder, and the deformation-divided resonance of the diaphragm is suppressed to obtain good
acoustic characteristics. In the present embodiment, the same effect can be obtained even if the
shape of the imaging plate is a cone shape other than the dome shape, and good results can be
obtained even when used as a surface material of a flat plate imaging plate having a sandwich
structure. It is obtained. Effects of the Invention As described above, according to the present
invention, a material obtained by mixing a kraft pulp, a chitosan deacetylated chitin, which is a
natural polymer, and a polyamide / epichlorohydrin resin having an epoxy group is used as a
diaphragm. The epoxy groups react with the hydroxyl groups of pulp fibers and the amino
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groups of chitosan to chemically bond the fibers together, the chitosan molecule has positive
polarity, and the pulp fibers have negative polarity. Compared with the conventional structure
such as paper pulp, the strength is high and the rigidity is high as compared with the structure of
fibers and the like, and it becomes a material which looks like a diaphragm.
In addition, since a slip between fibers is simultaneously present, the internal loss is also large,
and a speaker having good acoustic characteristics can be realized. In addition, since mechanical
internal loss is increased by the effect of kraft pulp, it is possible to obtain a speaker having
excellent sound pressure-frequency characteristics, distortion rate, and phase characteristics with
less deviation in frequency characteristics. Furthermore, since the diaphragm element of the
present invention uses a material having kraft pulp as a main component, it can be manufactured
by the conventional paper making method, and therefore it is very excellent in mass productivity.
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