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JPH03286700

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DESCRIPTION JPH03286700
[0001]
The present invention relates to an electric sound W converter using a novel material, for
example, a Funo diaphragm of a speaker. <Conventional technology> A conventional speaker
diaphragm of this type is made by beating the paper pulp 7 to make it into a sheet, or if it is a
thermoplastic synthetic resin material, it is a thermoformed polypropylene, a liquid crystal
polymer 4 What heat-molded, the carbonon and the humbonnod of resin were shape ¦ molded by
heating and pressurizing with a type ¦ mold etc. are used abundantly. <Problems to be Solved by
the Invention> Therefore, the conventional speaker diaphragm of this type had the following
problems. The paper valve diaphragm has a Young's modulus of 1.5 to 4.
OX10 dyne/cx! Since there is no degree, it is not sufficient as a diaphragm. Since
the thermoplastic base e and the diaphragm made of resin material have small rigidity and large
specific gravity compared to the thickness, it is difficult to reproduce the high-pitched range.
Moreover, the diaphragm made of liquid crystal polymer material is used in the manufacturing
process. Since the difference between the elastic modulus in the direction of injection and in the
direction perpendicular thereto is large, the vibration mode becomes uneven. Furthermore, the
diaphragms of carbon and resin humbo knots have various problems in that there is no
molecular friction of the material, so the internal vibration transmission loss (the value of N
which declines with tan δ is small and the specific gravity is large, so that they are heavy.
Therefore, in order to solve such conventional problems, the present invention is a diaphragm
molded using a novel material, which has a high Young's modulus, therefore a high rigidity, a low
specific gravity, and a difference in elastic modulus due to directivity. It is an object of the
present invention to provide a diaphragm which does not exist at all and has a moderate internal
loss. <Means for Solving the Problems> The present invention for achieving the object will be
described based on examples. The present invention is a novel material, that is, a rod-like
polymer 11fO having high elasticity and no directivity. By using (P B T), (P B Z T), and (P B O), it
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becomes a lightweight and highly elastic speaker diaphragm. Since the present invention is
configured as described above, the physical advantage of the material of the present invention
that the difference in the elastic modulus is different due to the directionality of the elastic
modulus is the essential advantage, the high elastic modulus, the high rigidity, and the
appropriate internal loss. Because it is used cleverly, it can be possible to make excellent sound
reproduction possible when it is incorporated into a speaker. Next, an embodiment of the present
invention will be described. In this example, an extruded PBZT sheet is stretched by 2 m to a
sheet of 0, 5 zz thickness. This sheet is formed with a network of microfibrils of 0.1 μl or less
and has a non-directional property.
Next, the physical properties of the diaphragm of the present invention, in which the second
sheet is formed into a cone shape by vacuum forming, are compared with those of the
conventional example as follows. Since the maximum frequency of the reproduced sound is high,
the reproduction f area I is expanded as wide as possible. The specific gravity is small and the
electric noise is low because the degree is low. It is possible to expect remarkable effects such as
high conversion efficiency, and further, that the reproduced sound is not distorted due to the
appropriate conduction loss. Although the present invention is not necessarily limited to only the
structure of these embodiments, it is within the scope having the v4r & requirement of the
present invention, achieving the object of the present invention, and having the following effects.
Can be modified as appropriate. <Effect of the invention>
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