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JPS5764986

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5764986
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged cross-sectional view of a
diaphragm of the present invention. 1 is a polyolein resin, 2 is a pulp fiber.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm having a light weight, a high elastic modulus and a sufficient loss. In the past,
diaphragms made of polyolefin resins such as polypropylene, polyethylene, and copolymers of
propylene and ethylene alone have low modulus of elasticity, making it difficult to reproduce
with high sound. Also, in the case of pulp fiber alone, there is a drawback that smooth frequency
characteristics can not be obtained because the loss is not sufficient. The present invention has
been devised to eliminate the above problems and drawbacks, and it will be noted that the
embodiment shown in FIG. 1 can be made of polypropylene, polyethylene, propylene and
ethylene as shown in FIG. It is a diaphragm for a speaker in which a film or sheet of a polyolefin
resin 1 such as a polymer is used as an intermediate layer, and kraft pulp fibers 2 subjected to
beating of freeness 300 to 500 CC are heat pressed as front and back amphoteric layers. Since
the diaphragm according to the present invention is structured as described above, a diaphragm
having a high elastic modulus and a sufficient loss can be obtained, and a speaker having a wide
reproduction band and smooth frequency characteristics can be formed.
11-05-2019
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