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The invention relates to an acoustic diaphragm made of glassy carbon. Conventionally, a
diaphragm made of aluminum is used as a diaphragm used for a speaker or the like, but this
diaphragm is E / .rho. , Ρ: density = 4I / 鵬 3) value is small as about 2.6 × 10'W & 2/8 @ Q 2
and there is a defect that the high frequency resonance frequency is low, and high frequency
sound can be reproduced clearly and sound A little bit of distortion was For this reason, although
a diaphragm using carbon fiber or a diaphragm such as alumina has been announced, both have
superiority in terms of performance and cost as compared with the aluminum back diaphragm
commonly used at present. Not allowed. (Structure of the Invention) In view of the above
circumstances, the present invention aims to provide an acoustic diaphragm made of glassy
carbon having an E / ρ value higher than that of AJ, and the gist of the present invention is a
cellulose fiber 10 to 40 parts of the carbides of the thermosetting resin dispersed in 100 parts of
carbides of the thermosetting resin, and they are integrally bonded, in an acoustic diaphragm
having E / で あ る of 2.6 × 10′s2 / 5ea2 or more. The present invention will be described
below. The cellulose fiber used for the acoustic diaphragm according to the present invention is a
high-fiber cellulose, such as kraft paper, linter paper, F-track rape paper, or cotton. Those are
preferred. Moreover, as a thermosetting resin, a phenol resin, a furfuryl alcohol resin, nphenyl
benzene resin, unsaturated polyester resin etc. are used. As the phenol resin, dry oil-modified
phenolic resin such as flax oil and soy sauce, and rosin-modified phenolic resin such as rosin can
be used and included in the present invention. In order to layer the acoustic diaphragm, a
cellulose fiber such as paper is cut to a length of about 5 mm to 10 u + and dried, and the liquid
thermosetting resin or thermosetting resin such as mt-acetone or ethanol is used. Knead with a
solution diluted with a solvent to form a thin plate of a predetermined thickness by passing
between two rolls, molding it with a hot press etc., curing it and then baking it, or drying kraft
paper, linter paper etc. There is a method of diluting the above-mentioned thermosetting resin or
solvent, impregnating the resin, impregnating the resin, laminating a plurality of sheets, and
compressing, molding, curing and baking the same as before. Needless to say, the reason for
drying the cellulose fiber in the above method is the removal of water, but in order to improve
the mutual wetting of the green cellulose fiber and the thermosetting resin for the removal of
water and to facilitate one kneading or impregnation. It is.
In order to make an excellent acoustic diaphragm, the weight ratio of thermosetting resin to
cellulose fiber is extremely important. To make E / 高 域 of the fired diaphragm product not less
than 2.6 × 10 'm 2 / 5ea 2 to make the high-frequency sound clear and to reduce the distortion
of the sound and to have an easy-to-handle strength The carbonization ratio of cellulose is about
6 in the case of thermosetting resin carbide / cellulose fiber carbide having a ratio of 100/10 to
100/4 G, preferably 100/20 to 100/30. The carbonization ratio of the thermosetting resin is
about 401, and the above blending is performed in consideration of these. Further, the E / 値
value may be 2.6 × 10 1 / sea or more, but the larger this value is, the more preferable in order
to make the high range sound clearer. In addition, since a thin diaphragm with a thickness of
about 100 μm can be coarsened on a speaker, appropriate strength is required, and one having
a bending strength of 1000 kg / cm or more is easy to handle. In firing, a temperature rising rate
at a temperature rising from 230 ° C. to 360 ° C. in a non-oxidizing atmosphere is particularly
important, and the temperature rising rate in the above range is 1.5 ° C./hr or less. In the other
temperature range conditions, the temperature is raised to about 1100 ° C. and fired at a
temperature rising rate of about 5 to bhr. When the temperature in the category of 230 to 360
° C. is raised at a high speed, the yield of good products is not good. The reason is that the
change in the form of chemical bonding in the range of 230 to 360 ° C. of the resin component
is large, and it may be necessary to pass under mild conditions. Next, the acoustic diaphragm
according to the present invention was prepared by the following method and compared.
Example 1 Cotton and phenol resin were mixed and kneaded so as to be resin / cotton: 100/65,
and a sheet of 1.0 mm thickness was put on a roll. After making it pressure / heating (loO ˜ /
cIn2, 150 ° C) L15Gμm fi / L / A, it is held in a graphite cedar board, molded and cured, and
then the temperature is 40 ° C ˜ 230 ° C. hr% 230 to b1 °, 360 to 1100 ° C .: 50 50 / hrtr.
This is designated as sample A. Example 2 Crepe paper was immersed in 1 m0 N of phenol
dissolved in acetone, pulled up, laminated 4 sheets, and pressurized and heated (100 kg / cln
2.150 ° C.) to be shaped and hardened. In this case, dissolve in acetone and adjust the amount
of resin to make resin / cellulose: 100/80 fc. This was fired under the same conditions as in
Example 1 to prepare an acoustic diaphragm.
Table 1 shows the physical properties of the above-mentioned Sample A% Bi-Mo and an
aluminum diaphragm in which this is Sample B. As described above, since the acoustic
diaphragm for glassy carbon according to the present invention can be easily manufactured, it is
inexpensive and excellent as an acoustic diaphragm. Procedure correction (Self-President Patent
Office Secretary 1, display of the case 1984 patent application gi72'543 2; name of the invention
acoustic diaphragm 3, applicant patent applicant (2θ 0) Showa Denko Corporation 4 , Agent
Ming NA 41i, "The Detailed Description of the Invention". 6. Contents of corrections (1)
Description 1 J1 line 13 to page 2 line 6, "Conventionally, it has not been recognized as a speaker
etc. And correct the following statement. [Conventionally, as diaphragms used for speakers, those
made of paper, resin, metal, etc. have been used, and pulp and polypropylene are representative
examples of these. There are aluminum, titanium and so on. These diaphragms are E / p (where E
is Young's modulus: J911151 IC "@"). P has the following problems: Density: & p / c @ JI) as
small as about 2.6 x 10 'm "/ sec" or less, and high resonance frequency is low. It was For this
reason, although a vibrating plate made of carbon fiber or a diaphragm made of alumina or the
like has been announced, both are superior in productivity and cost as compared with the
currently commonly used wJ-Shan. Not allowed. (2) Page 2 1 lff line, correct AJJ as rAJ-TiJ.
(3) On the second page, line 16 to 1 line, correct about 100 μ votes to r00011 gm or
less . (4) On page A, line 11, correct "aluminum, titanium" as "aluminum, titanium". (5) The first
page of Table 1 is attached (corrected).
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