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JPS5149718

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DESCRIPTION JPS5149718
Patent Office Secretary Saito Hideo 1 Title of the Invention 2 Inventor Address (Location)
Akizawa, Tokyo Miyazawa-cho, Akizawa-shi, Tokyo Foster Electric Co., Ltd. Name within the name
of Hideyuki Ichikawa-3 Applicants 4 List of documents 1 Description 1 2 1 drawing Address
(location): 512, Miyazawa-cho, Akishima-shi, Tokyo, -8, -7, -1'44; 'j; (hs:' -i-'rL name Muraoka-yuki
;;, 9.) "Io + 20 [phase] Japanese Patent Office Open Patent Publication ■ Japanese Patent
Application Laid-Open Nos. 51-49718 and 4tll 1- 1 Specification 1 title of the invention 1 title of
the invention speaker diaphragm
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm. In the past, as a means to increase the internal loss of the speaker diaphragm and to
lower the Q of the speaker, rubber latex is mixed into the diaphragm material of various fibers to
form a paper, or paste-like rubber is applied from above formed cone paper It is known to do.
The former method is certainly a good way to fully impregnate the fibers of the diaphragm
material with rubber, but on the other hand, as shown in FIG. 1, the impregnated rubber (1)
strengthens the bonds between the fibers (2). The rigidity is increased and the speaker Q does
not substantially decrease, and it is unwise to control the Qk over a wide range. In the case of the
latter method, it takes time and effort to apply a rubber agent, and the amount of the rubber
agent to be coated is likely to be uneven or uneven, and it is difficult to obtain a uniform product.
there were. The present invention eliminates the above-mentioned drawbacks, that is, a rubber
material such as a natural rubber, a synthetic rubber, a urethane rubber, and a recon rubber is
formed into a thread having a diameter of 005 fat to 10 mm, which is 3 m, 10 Cut in between to
make rubber fiber. This is mixed with other vibrating plate materials such as chemical fibers or
fibers such as natural fibers, and formed into a paper. Bonding state of rubber fiber and fiber in
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the diaphragm made in this way? It is shown in FIG. According to the above method, the amount
of rubber fiber to be mixed can be greatly changed, and there is no strengthening of the interfiber bond as when a large amount of rubber latex is added, so the changeable range of Q of the
diaphragm is possible. Water: EndPage: All together, it is possible to freely adjust the internal loss
of the diaphragm and to obtain a speaker with flat frequency characteristics. FIG. 6 shows an
output sound pressure frequency characteristic when the present invention is applied to a bass
speaker, and a broken line shows an output sound pressure frequency characteristic of the
conventional speaker. In order to obtain a uniform product, the present invention can further mix
rubber fibers in the process before papermaking, and it is more preferable than coating of pasty
rubber on molded corn paper. Since the vibration absorption of the rubber itself is larger when it
is mixed as a fiber body, the amount of rubber can be small. The fibers of the above-mentioned
chemical fibers and 1 to, for example, “high aromatic fiber based on all-aromatic-amide-based
fibers or carbon fibers”, rubber fibers are mixed with this and formed into a paper, high rigidity,
high loss and low It is also possible to obtain a sound caustic.
4. Brief description of the drawings FIG. 1 is an explanatory view for explaining a bonding state
between fibers of a speaker diaphragm according to a conventional embodiment, (1) is rubbery,
and (2) is fibrous. FIG. 2 is an explanatory view showing bonding between fibers of the speaker
diaphragm according to the present invention, in which (1) is a rubber fiber and (2) is a fiber.
FIG. 6 shows the conventional speaker frequency and the output sound pressure frequency
characteristic I'l of the speaker diaphragm according to the present invention. Patent applicant
Foster Electric Co., Ltd. Third proceedings amendment January 27, 1974 Patent application No.
123,192 Patent application No. 2 invention title 2 invention title speaker diaphragm 3 Person
who makes corrections Relationship with case Applicant's Address (Location) 512, Miyazawacho, Akishima-shi, Tokyo Name: Name (Name) Foster Electric Co., Ltd.
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