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JPH04368098

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DESCRIPTION JPH04368098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker in an electroacoustic transducer.
[0002]
2. Description of the Related Art As is well known, a speaker diaphragm is ideally made of a
material which is excellent in sound velocity and does not have an inherent resonance frequency,
has a high elastic modulus (Young's modulus E) and a density (密度). Has been developed in
search of a diaphragm material with a low internal loss (tan δ). At present, in view of easiness of
molding, cost and the like, a diaphragm made of natural cellulose fiber (paper or the like) is
widely used.
[0003]
Although a speaker diaphragm made of natural cellulose fibers such as paper is known to satisfy
the above conditions with an excellent balance, it still has sufficient physical properties in terms
of sound velocity. Since it has not been done, some ideas have been made such as mixing (linear)
carbon fiber known to be highly elastic with paper. However, since carbon fiber and natural
cellulose fiber do not hydrogen bond, even if the amount of carbon fiber mixed is increased,
slippage is caused between carbon fiber and natural cellulose fiber, and hydrogen bond between
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natural cellulose is impaired, and mischief It just ended up causing an increase in weight.
[0004]
An object of the present invention is, therefore, to provide a speaker diaphragm excellent in
sound velocity and light in weight, by solving the disadvantages of the prior art.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker diaphragm
according to the present invention comprises coiled carbon fibers mixed with a speaker
diaphragm material using natural cellulose fibers. The coiled carbon fiber is mixed with the
speaker diaphragm material at a ratio of 1 to 20 wt%.
[0006]
In the speaker diaphragm of such a configuration, since the inside of the coiled carbon fiber is
hollow, the apparent density ρ of the entire speaker diaphragm is lowered, and the coiled
carbon fiber is formed. The elasticity of the speaker diaphragm increases because of the elasticity
of the
Moreover, since it is in the form of a coil, it does not easily slip with natural cellulose fibers.
When the mixing ratio of the coiled carbon fiber to the speaker diaphragm material is 1 to 20
wt%, the elasticity of the speaker diaphragm is most efficiently improved without damaging the
hydrogen bond between natural cellulose fibers.
[0007]
The present invention will be described in detail by using a wood pulp fiber highly beaten as a
diaphragm material for a speaker using natural cellulose fiber, with a diameter of 0.1 to 1.0 μm,
a coil What mixed 5 wt% of coil-like carbon fibers with a diameter of 10 to 100 μm and a length
of 0.1 to 2.0 mm was paper-formed into a cone shape to obtain a speaker diaphragm according
to the present invention.
[0008]
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Although the speaker diaphragm according to the present invention has been described in detail
based on the embodiment considered to be representative, the embodiment of the present
invention is not limited to the structure of the above embodiment, The invention can be
appropriately modified and implemented as long as it has the configuration requirements
described in the above-mentioned claims, exhibits the effect of the present invention, and has the
effects described below.
[0009]
The physical properties of the speaker diaphragm obtained in the above example and the
physical properties of the speaker diaphragm obtained by paper-making in the same manner as
in the example using only wood pulp fibers as a conventional example for comparison It is shown
in Table 1.
[0010]
As apparent from Table 1 above, the speaker diaphragm according to the present invention has a
small density が and an increased elastic modulus, so that the speed of sound is improved and
the internal loss is also improved. The speaker diaphragm is excellent in sound quality with
excellent response without coloring due to natural vibration.
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