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JPS57138297

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DESCRIPTION JPS57138297
Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention It is an object of the present invention to provide a
speaker diaphragm which is capable of continuous production and is excellent in water
resistance and has a large internal loss. Most of the commonly used speaker diaphragms use
natural pulp as a material. Therefore, it has an appropriate elastic modulus and internal loss, and
has the feature of being extremely lightweight as a whole because it includes an air layer.
However, on the other hand, there is a problem that the manufacturing process is complicated
and therefore the variation is large, and the water absorption is thick. The present invention is
intended to eliminate the above-mentioned conventional drawbacks, and after mixing an
adhesive short fiber into a thermoplastic synthetic pulp, forming it into a sheet and then
thermoforming it, a speaker diaphragm is obtained. It is a thing EndPage: 1 ru. According to the
present invention, since thermoplastic synthetic pulp is used as the material, the water resistance
is remarkably improved, and furthermore, the speaker diaphragm having high internal loss can
be easily and continuously produced. Here, as the thermoplastic synthetic pulp, a polymer
processed for folding paper by hydrophilic treatment such as high density polyethylene,
polypropylene or TPX may be used, and as the adhesive short fiber, polyamide based fiber (nylon
6, 6 .6, 12 copolymers). Hot melt type fibers such as polyvinyl alcohol fibers may be used. Next,
an example will be described. (1) A polyamide adhesive fiber of 6 mm in fiber length and 30
denier with high density polyethylene synthetic pulp (80 wt%) as a base material (nylon 6, nylon
6.6. Copolymer of nylon 12) wt% of carbon fiber (fiber length emm) and 5 wt% of aramid fiber
(fiber length 2 mm) were added as a reinforcing agent, and they were mixed well with a
disintegrator (Peta) and formed into a sheet. (Areal density 10 o, 1 ii 1 Then, the thus-formed
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sheet was heated for several seconds with a heat plate (1sO'C), and when the notebook was
softened, it was cold-pressed to obtain a speaker diaphragm. (2) Further, polyvinyl alcohol (PVA)
fiber (fiber length 11J 5 wt%) was mixed as an adhesive fiber in place of the polyamide adhesive
fiber, and a speaker diaphragm was obtained similarly. (3) In addition, paper cones were also
prepared, which were constructed without mixing the adhesive short fibers in the case of
comparison and paper cones using ordinary natural pulp. Then, the elastic modulus, the internal
loss, and the density of each of the speaker diaphragms were measured, and the results of Table
1 were obtained.
As is apparent from Table 1, according to Example (1) l (21, the elastic modulus is moderately
large and the internal loss is sufficiently large, so that the speaker diaphragm has excellent
characteristics such as flat frequency characteristics with little variation in frequency
characteristics. You can get things. In addition, according to Example +11, ((2+, synthetic pulp is
used as the base material, and the water resistance is large, which is extremely advantageous
practically. As described above, according to the present invention, an excellent loudspeaker
diaphragm can be obtained easily according to the present invention, as is apparent from the
examples. Further, instead of processing one by one like a paper cone, continuous thermal
molding is performed. Production, and has many advantages, such as high quality and low cost
speaker diaphragms. Name of agent Attorney Nakao Toshio has 1 person EndPage: 2
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