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JPS6343496

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DESCRIPTION JPS6343496
[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. An example of the abovementioned conventional speaker will be described below with reference to the entire 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 fixed to the full tip 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 magnets, balls, plates and yokes. 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 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 Acoustic Engineering, Nikkan Kogyo
Shimbun). Problems to be Solved by the Invention However, although it is ideal for the
diaphragm of the speaker to move in a piston over the frequency band to be used, if the
diaphragm is deformed or split vibration occurs during vibration, the sound pressure-frequency
The characteristics, distortion rate, phase characteristics, etc. are degraded, which hinders high
fidelity reproduction. In addition, the conventional paper cone diaphragm and plastic imaging
plate have a low E / ? (where E: elastic modulus, :: density) of the diaphragm material, so the
high region resonance frequency is low and the speaker is high Is there a drawback of not being
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able to play? -O In view of the above problems, the present invention is to provide an entire
diaphragm for a speaker having a high high-resonance frequency, not mainly a Q divided
vibration metal in which the diaphragm is deformed during vibration. Means for Solving the
Problems In order to achieve this object, the imaging moving plate for a speaker of the present
invention is a vibrating plate made of a mixture of kraft pulp and chitin, which is a natural
polymer, graft-polymerized with polyvinyl alcohol. Used as In the present invention, this sheetlike material is mixed with all kraft pulp material which is a natural polymer material having a
large elastic modulus, which is a material composed of chitin and polyvinyl alcohol grafted with a
chitin material and having a large mechanical internal loss. Due to the construction, the bending
rigidity of the diaphragm is very large due to the effect of chitin, and the diaphragm is not
deformed or split resonance does not occur during vibration.
Also, due to the effect of polyvinyl alcohol grafted onto chitin, the mechanical internal loss is
increased, so all speakers with excellent sound pressure-frequency characteristics, distortion rate,
and phase characteristics are less affected by frequency characteristics. You can get it. ! In
addition, since this diaphragm material is a polyvinyl alcohol which is graft-polymerized to chitin,
the affinity with kraft pulp having all the same hydroxyl groups is large, and a binding property
with kraft pulp is good and a strong paper can be formed. In addition, since polyvinyl alcohol
graft-polymerized with chitin is hydrophilic, there is no concern that it will separate from water
at the time of paper making. 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 mixing kraft pulp and chitin which is a natural polymer,
formed, 6 is a voice coil bobbin with its tip fixed to the diaphragm 4, 6 is a magnetic gap of the
magnetic circuit (shown in FIG. Is a voice coil inserted into the 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) including 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 transmitted to the vibration of the diaphragm 4 and emitted as a sound wave. Next,
the method for producing the diaphragm 4 will be described. The weight ratio of kraft pulp and a
material obtained by graft polymerizing polyvinyl coal having a degree of polymerization of 1 o
00 on chitin (powdery, 120 mesh pass) which is a natural polymer Mix at a ratio of 3 near. Then,
papermaking is performed by the circular mesh method, and a dome-shaped diaphragm with a
diameter of 30 g / vf is used with a bore diameter of 28. As described above, according to the
present embodiment, the speaker using all the diaphragms 4 formed by mixing the kraft pulp
and the natural polymer, chitin, which is a graft polymer of polyvinyl alcohol into a graft
polymer, is a deformation of the diaphragm; The split resonance does not occur and good
acoustic characteristics are obtained, and the distortion rate 'compared to the aluminum dome
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type moving plate of the same shape. ! It can be reduced by -30 dB. Also, the high resonance
frequency can be raised from 21 KHz to 30 KHz.
In addition, the peak sound pressure of the output sound pressure can also be reduced by about
▒ 3 dB as compared to the aluminum diaphragm by ▒ 3 dB. Effects of the Invention As
described above, the present invention uses a molded material obtained by fully mixing the
material of kraft pulp and chitin, which is a natural polymer, all graft-polymerized with polyvinyl
alcohol into a diaphragm, and has a small distortion ratio and high frequency range. It is possible
to obtain all the speakers having high resonance frequency and large acoustic output, and to
realize all the excellent speakers having good acoustic characteristics.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an imaging system of a speaker diaphragm in one embodiment
of the present invention, and FIG. 2 is a cross-sectional view of an imaging system of a
conventional speaker.
4 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и voice coil bobbin, 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и. The name of the person who is the person p. The buried person Toshio Nakao and one other
person Figure 1-6--Voice coil? ??????????░??
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