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一一 一 J] specification 1, the title of the invention
Manufacturing method of diaphragm for speaker
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker diaphragm capable of manufacturing a speaker diaphragm having
excellent properties with good formability. As the conventional speaker diaphragms having high
elasticity, those using titanium foil or aluminum foil, and those using beryllium foil recently have
been put to practical use. 2、、、−、。 The specific elastic modulus can not be obtained, and
the speaker diaphragm using A Lilium foil has excellent rigidity but it is difficult to mold and very
expensive, and there is also a problem in the working environment such as pollution There was a
drawback. The present invention is intended to provide a method of manufacturing a speaker
diaphragm which eliminates the above-mentioned conventional drawbacks. An embodiment of
the present invention will be described below with reference to FIGS. 1 to 4 of the drawings. That
is, 1) the present invention dissolves polycarbosilane 1 in a solvent such as methyl ketone and
mixes powder 2 such as silicon (Si), silicon oxide (Sin), titanium (Ti), boron Φ), carbon silicon
nitride (SiC) into this The molded product is molded into the shape of the speaker diaphragm as
shown in FIG. 1, or is formed into a sheet once and then molded into the speaker diaphragm as
shown in FIG. The temperature is gradually raised in active gas, and calcinated and carbonized at
a high temperature of 1000 to 1400 ° C, and polycarbosilane 1, silicon, silicon oxide is silicon
carbide as silicon carbide EndPage: 13 parts I, the whole is silicon carbide (SiC) or Tic. The
speaker diaphragm 3 shown in FIGS. 3 and 4 made of B4C is obtained. The mixing ratio of the
polycarbosilane 1 to the silicon carbide 2 is 20 to 40 wt% of the polycarbosilane 1 with the
balance being silicon carbide. Moreover, it shape | molds in the speaker diaphragm shape at a
temperature of 200-300 degreeC. Firing conditions are as follows: temperature is gradually
raised to 400 ° C for about 1 hour at first, and temperature is raised to 1000 ° C to 14oO ° C
(desirably near 1300′′c) in the remaining 3 to 4 hours and firing is performed Do. The
molecular weight of the polycarbosilane has the best property in the range of 1 o O o to 1600
and changes to silicon carbide by firing. Next, test results of physical characteristics of a
conventional speaker diaphragm for aluminum, titanium and barium, and a speaker diaphragm
mixed with SiCfzr of the present invention will be shown. As described above, according to the
method for manufacturing a speaker diaphragm of the present invention, the speaker diaphragm
having excellent rigidity can be manufactured with good formability, and the shape thereof may
be any shape such as dome shape or cone shape. It is advantageous in terms of cost, is free from
environmental problems such as pollution at the time of production, has many advantages such
as being highly safe, and is of great industrial value.
4. Brief description of the drawings 5 /-1. An enlarged sectional view of FIG. 3, FIG. 3 is a
sectional view after baking carbon, and FIG. 4 is an enlarged sectional view of the main part. 1 ...
polycarbosilane, 2 .... charcoal silicon, 3 ... speaker diaphragm. Name of agent Attorney Nakao et
al. 1 person Fig. 1 EndPage: 2 Fig. 3 ゝ Procedure correction 1 Case display 1 Patent No. 114804
No. 2 invention title 2 invention title 2 speaker name Speaker State diaphragm manufacture
Relationship with the person who makes the law 3 patent application Patent application for Sosa
office Osaka Prefecture Kadoma city Ogata Kadoma 1006 Name (582) Representative of
Matsushita Electric Industrial Co., Ltd. Toshihiko Yamashita 4 Agent 〒 517 Contact phone
(Tokyo) 437-1121 Patent Office] 5 Subject of correction 6, the contents of correction (1) The
“methyl ketone” in the 11th and 12th lines of page 2 of the specification will be corrected to
“benzene”. (2) On page 3, lines 1 and 2, correct "composed of silicon carbide (Sin) and
TtC9B4ci" to [made of silicon carbide (SiC) or partially composed of TiC1 and B10].
EndPage: 3
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