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JPH01213100

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DESCRIPTION JPH01213100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various audio devices. [Prior Art] A diaphragm of a speaker used for
various audio devices. This material can be classified into pulps such as organic fibers and
inorganic fibers, metals such as aluminum and duralmin, and resins such as polypropylene.
Among the materials of such diaphragms, thermoplastic resins typified by polypropylene are
widely used as diaphragms for speakers in recent years because molding is extremely easy.
[Problems to be Solved by the Invention] However, the diaphragm made of a thermoplastic resin
represented by polypropylene is easily deformed during use by the heat generated by the voice
coil since the melting point of the resin itself is as low as 150 ° C. Since the specific gravity is
also relatively large, the obtained diaphragm tends to be heavy (there are many problems in the
performance and reliability of the speaker). In addition, there is a disadvantage that it is difficult
to obtain a speaker diaphragm having sufficient rigidity particularly at high temperatures even
when a filler is added because the bending strength is small. [Means for Solving the Problems] As
a result of researching many plastic materials in view of the present invention, the present
invention is based on a diaphragm made of polymethylpentene resin which is lightweight and
has excellent creep resistance and heat resistance. We have developed a speaker diaphragm as a
material. In a first aspect of the present invention, there is provided a speaker diaphragm
characterized in that it is made of polymethylpentene resin. The second invention is a diaphragm
for a speaker, which is formed by injection molding of polymethylpentene resin, and the third
invention is alumina, carbon, calcium carbonate, mica, talc or glass fiber The speaker diaphragm
is formed by injection molding of a polymethylpentene resin composition to which one or more
fillers selected from the above are added. Polymethylpentene resin in the present invention. The
monomer is a resin synthesized from propylene and based on a polymer of, for example, 4methylpentene-1. In the third invention, the filler to be added to the polymethylpentene resin is
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alumina, carbon, calcium carbonate, mica, talc or glass fiber, and may be used alone or in
combination of several kinds in the range of 10 to 30% by weight. Do. When the amount of filler
is 10% by weight or less, sufficient rigidity can not be obtained, and the use of 230% by weight or
more increases the rigidity of the diaphragm itself but is inferior in the performance of one
speaker.
[Operation] This invention uses a polymethylpentene resin or a polymethylpentene resin
composition to which a filler is added as a material of a diaphragm for a speaker, so that the
obtained diaphragm for a speaker is resistant to creep and heat. Is excellent in molding stability,
is particularly resistant to deformation due to heat generation of the voice coil, etc., has sufficient
rigidity as a speaker diaphragm, has a low specific gravity, and has a good response to 7 people
(additional loss Less distortion because it can The present invention will be described in detail
below. Example 1 A speaker diaphragm of 16 cmφ in diameter was formed by injection molding
using polymethylpentene resin as a material. The obtained speaker diaphragm has a flexural
modulus of 1 month. The melting point was 210 DEG C. and the specific gravity of 0.80.
Tsubakimoto t (++ I s polypropylene was used as a material, and a speaker diaphragm of 15 cmφ
in diameter was formed by injection molding as in the example. The obtained speaker diaphragm
had a bending elastic modulus of 1 ° OXIO 'kg / cJ, a melting point of 150 ° C. and a specific
gravity of 0.9. Example 2 A speaker diaphragm of 15 cmφ in diameter was formed by injection
molding using a polymethylpentene resin composition obtained by adding 15% by weight of
alumina fibers as a filler to polymethylpentene resin as a material. The speaker diaphragm thus
obtained had a bending elastic modulus of 1 ° 7 × 10 ′ kg / cJ and a melting point of 218 °
C. and a specific gravity of 0.83. Example 3 A speaker diaphragm of 15 cmφ in diameter was
formed by injection molding using a polymethylpentene resin composition obtained by adding
20% by weight of alumina fiber as a filler to polymethylpentene resin as a material. The speaker
diaphragm thus obtained had a flexural modulus of 2 ° OX 1.0 'kg / cot and a melting point of
240 ° C. and a specific gravity of 0.90. In the same manner as in the example described above, a
diaphragm for a speaker having a diameter of 15 cmφ was formed by injection molding, using
polypropylene as a material and adding 15% by weight of alumina as a filler. The obtained
speaker diaphragm had a two-bending elastic modulus of 1 ° 3 × 10 ′ kg / cA and a melting
point of 156 ° C. and a specific gravity of 1.2. [Effects of the Invention] The speaker diaphragm
of the present invention is a polymethylpentene resin obtained by adding a filler to a
polymethylpentene resin or polymethylpentene resin which is light in weight and is excellent in
creep resistance and heat resistance as a diaphragm material. Since the composition is used, the
obtained speaker diaphragm is lightweight, is excellent in creep resistance and heat resistance,
hardly deforms due to heat generation of the voice coil, etc., and has sufficient rigidity as a
speaker diaphragm. In addition, since the specific gravity is lighter than that of the conventional
polypropylene diaphragm, the response to the input is good and the distortion is small, the
performance of the obtained speaker is greatly improved, and the bending elastic modulus is also
excellent. Therefore, it has many practical advantages such as obtaining a speaker diaphragm
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having sufficient rigidity.
Patent Assignee Minebea Co., Ltd. Representative Patent Attorney Yuki 1) All Hiro 7-1
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