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October 3, 1975 Diaphragm for speaker 2 inventor 3 Patent applicant address Osaka Prefecture
Kadoma city Oda Kamon address 1006 Name (582) Matsushita Electric Industrial Co., Ltd.
Representative Masaharu Matsushita 4 Agent 〒 571 Address Osaka Prefecture Kadoma City
Ozamon Kamonshin Address 1006 5 List of Attachments ms ■ Japan Patent Office ■ JP 52446280 Published Nissho 52. (1977) 4.7 Japanese Patent Application No. 50- / 20 / ': I2 Inside
the Office No. 64-6555 A method of adding a suitable amount of glass fiber or the like is carried
out for the speaker diaphragm 3, detailed description of the invention The present invention
relates to an acoustic device, particularly to a diaphragm of a speaker, which has a high elasticity
and a large specific modulus and a suitable internal modulus by forming a zirconia fiber into a
paper shape or mixing it with a pulp or other organic fiber material. It is an object of the present
invention to provide a diaphragm having a loss. Heretofore, as a speaker imitation plate, a large
number of paper-made molded articles of pulp and other fiber materials are used, and metal
domes and plastic films are also put to practical use for high-pitched sound reproduction. In
general, the paper hole diaphragm has a small rigidity and elastic modulus, and in order to
improve its defects, a highly elastic twill weave, for example, a carbon fiber or a combination of
.quadrature. There was a drawback such as the workability in the case of The present invention
eliminates the above-mentioned conventional defects, and in particular provides a speaker
diaphragm having an improved elastic modulus, and is characterized by using a zirconium oxide
fiber. Zirconium oxide fiber (hereinafter referred to as zirconia a fiber) has a large elastic
modulus, and its surface is chemically active and has excellent affinity with organic fibers, so that
the adhesive property of the fibers with each other in mixing and forming with pulp etc. It has
been found that a diaphragm having a wide range of 51 power factor can be obtained by the
addition amount thereof. The details will be described below with reference to examples. 〔
Example〕? 1 out of 97 topal 7 ′ ′ (j = 2o 811 L) zirconia fiber I (thickness aμ 彎 length 20. )
And add 5% to 60%, acrylic gothic ester and melamine resin as 4EndPage: 1 binder respectively.
The mixed paper was made with s% & m, and the dry forming was performed at 120 ° C 1 Kg /
r: d by hot press. The result is the characteristic of A in the figure. Similarly, a comparison result
in the case of mixing glass fiber (8 μ, 20 U in each case) is shown by B in the figure. As apparent
from the figure, when glass fiber or carbon fiber is mixed with pulp, the specific elastic modulus
is maximized at the addition amount of 5 to 10%, and if it is added more than that, the bonding
between the a-planes of the molding becomes worse Although the elastic modulus did not
improve, it was found that when zirconia 1a fiber is used, the specific elastic modulus is also
greatly improved along with the increase of the addition amount up to about 30%.
As described above, according to the present invention, since the elastic modulus is improved as
compared with the conventional fine plate mainly made of pulp, it is possible to expand the
surrounding area regeneration characteristic, and it is possible to arbitrarily obtain the elastic
modulus by the addition amount. It has the advantage of being able to provide a speaker
diaphragm that is excellent in any point, which makes it possible to improve the heat resistance
of the marble.
4 is a diagram showing the specific elastic modulus of the speaker diaphragm A of the present
invention and the conventional speaker diaphragm B according to the drawings. Name of agent
Attorney Nakano Toshio et al. 1 person OIo 203 040 zirconia glass 蝮 I 庄 Containing 匍 (匍 6
Inventors and agents other than the above (1) Inventors (2) Agent address Osaka Prefecture
Kadoshi city Oji Kadoma Street EndPage: 2