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JPH04281697

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DESCRIPTION JPH04281697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer using a diaphragm made of straw fiber.
[0002]
BACKGROUND OF THE INVENTION For example, in an electrodynamic speaker generally used in
conventional audio equipment and the like, many materials have been developed as a material of
the diaphragm thereof, for example. As a typical physical property of the diaphragm made of
wood pulp, the density is 0.485, the Young's modulus is 1.17 × 10 10 dyn / cm 2, and the
internal loss is 0.0714.
[0003]
Generally, the diaphragm of such a speaker has ideal conditions such as (1) low density, (2) high
rigidity, and (3) high internal loss. In order to obtain such conditions, a diaphragm material
incorporating a highly rigid substance such as carbon fiber or aramid fiber, or a diaphragm
material having a large internal loss such as polypropylene has been developed.
[0004]
By the way, if it is attempted to increase the rigidity of the diaphragm, the internal loss may
decrease or the density may increase, and if it is attempted to obtain a large internal loss. There
is a tendency that the rigidity is lowered and the density is increased.
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[0005]
Therefore, balancing the elements (1) to (3) in high dimensions has become an important issue in
forming a diaphragm (corn paper) of a speaker.
[0006]
For example, in the case of an aluminum material, the density is 2.7, the Young's modulus is 62
× 10 10 dyn / cm 2, the internal loss is 0.002, and in the case of polypropylene, the density is
0.91 and the Young's modulus is 1.08. × 10 10 dyn / cm 2, the internal loss is 0.07.
[0007]
In the case of the diaphragm made of wood pulp, the internal loss is moderately large and the
density is also small, but there is a drawback that the frequency band is narrow due to the lack of
rigidity.
[0008]
Also, in order to obtain wood pulp, it is necessary to deforest the forest, and in order to restore
the forest to the place after harvesting, a large amount of cost and a long time are required at
present. is there.
[0009]
Furthermore, when making a diaphragm with wood pulp, the wood pulp is beaten over a long
period of time to make the fibers of the wood pulp easy to be entangled and obtain a high quality
diaphragm (the wood pulp is poured into water If the product is beaten (if it is beaten, the fiber
bundle will be loosened, the fiber will be of a suitable length, the fiber will swell and split
longitudinally, and the fiber will tend to become entangled).
[0010]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is characterized by using a diaphragm in which fibers taken out of a juvenile silkworm
are mixed with wood pulp.
[0011]
Furthermore, the present invention is characterized by using a diaphragm that has been wound
up with fibers taken out of the juvenile silkworm.
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[0012]
[Function] Since the juvenile silkworm has a thin fiber wall and the fiber bundle acts like a long
fiber, the density of the diaphragm for electroacoustic transducer is increased by the above
configuration. The rigidity and internal loss characteristics can be improved.
[0013]
As a result, it is possible to improve especially the high frequency characteristic of the frequency
characteristic of the electroacoustic transducer using the above-mentioned diaphragm.
[0014]
Embodiments of the present invention will now be described in detail with reference to the
accompanying drawings.
[0015]
FIG. 1 is a side cross-sectional view of one embodiment of an electrodynamic speaker using the
diaphragm of the present invention, in which A is a support plate having a center pole I
protruding at the center of the upper surface. The magnet B and the upper plate C are
sequentially mounted and fixed on the support plate A.
[0016]
G is a voice coil loosely fitted to the top of the center pole I and supported by the frame D via a
damper H.
[0017]
The inner peripheral edge portion of the diaphragm E is fixed to the upper portion of the voice
coil G, and the outer peripheral edge portion of the diaphragm E and the frame D are connected
by an edge F formed in a ring shape.
The speaker according to the present invention uses a diaphragm made of fibers taken out of a
juvenile silkworm as a material of the above-described electrodynamic speaker.
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[0018]
The diaphragm according to the present invention will be described in more detail as follows: a
fiber extracted from the juvenile silkworm is used to grind a loudspeaker diaphragm, or a fiber
extracted from the juvenile silkworm is mixed with wood pulp A speaker diaphragm is created by
mixing and extracting.
By thus forming the speaker diaphragm, the rigidity and the internal loss characteristics can be
improved without increasing the density.
[0019]
In addition, since high-tensed paper can be obtained without beating wood pulp for a long time,
productivity of the diaphragm can be improved.
[0020]
In the case of wood pulp, it is necessary to clear the forest to take pulp, and once it takes a long
time to recover, in the case of juvenile cocoons, only young stems (young cocoons) Because it is a
method of harvesting, it does not affect relatives, it can be harvested in the same place every
year, and it can be useful from the aspect of forest protection.
[0021]
The fiber of silkworm is short, but the growing juvenile has a thin fiber wall, and the fibers in the
fiber bundle become bundle-like, so-called fiber bundle works like a long fiber do.
[0022]
As a result, it is possible to obtain a diaphragm having a property such that there is no increase
in density while enabling improvement in rigidity and internal loss, and to realize a highdimensional and well-balanced diaphragm. Can.
[0023]
As an example, FIG. 2 shows frequency characteristics when a diaphragm obtained by mixing
50% of fibers and 50% of wood pulp taken out from a juvenile chidori mushroom is used for the
speaker of FIG.
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[0024]
In the case of the above diaphragm, the density is 0.489, the Young's modulus is 2.41 × 10 10
dyn / cm 2, and the internal loss is 0.06. As shown in FIG. The rigidity is enhanced, and
particularly the high band characteristics are improved, and good frequency characteristics in a
wider band than the conventional diaphragm are obtained.
[0025]
In the present embodiment, an example using juveniles of a hound bird is shown, but the type of
cage is not limited to this.
In addition, the mixing ratio of straw fibers and wood pulp is not limited to this embodiment.
[0026]
As described above, according to the present invention, the characteristics of the density, internal
loss, and Young's modulus of the diaphragm used in the electroacoustic transducer are balanced
at high levels. The frequency characteristics of the electroacoustic transducer can be improved.
[0027]
Furthermore, since the use of wood pulp can be restricted, it is highly practical from the
viewpoint of forest protection.
[0028]
In addition, since it is not necessary to beat wood pulp for a long time in the production process
of the diaphragm, the productivity of the diaphragm can be improved.
[0029]
Brief description of the drawings
[0030]
1 is a side cross-sectional view of an electro-acoustic transducer according to the present
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invention.
[0031]
2 is a frequency characteristic diagram of the electro-acoustic transducer according to the
present invention.
[0032]
Explanation of sign
[0033]
A Support plate E Diaphragm G Voice coil H Damper
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