Process of making an acoustic carbon diaphragm

Details Process of making an acoustic carbon diaphragm Process of making an acoustic carbon diaphragm

1989-03-07

1990-05-01

Thurlow, Jeffery

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156327, 156337, 264 296, 264134, 264250, 423445, 423448, 423449, 427228, B29C 6554, C01B 3102

Patent

active

049215590

ABSTRACT:
A process for producing a diaphragm for an acoustic device of carbonaceous materials which has the steps of mixing and kneading an organic mixture composition containing one or more or mixtures of a monomer, prepolymer and low polymer of relatively polymerizable thermosetting resin of a substance exhibinting high carbon residual yield after calcining with carbon powders as a binder, preliminarily molding the same in a film or sheet shape, calcining a diaphragm molding molded in a desired diaphragm shape and a voice coil bobbin molding molded in a desired voice coil bobbin shape from the film or sheet-like molding and then forming an integral structure of the diaphragm and the voice coil bobbin by calcining a composite material integrated with the diaphragm molding and the voice coil bobbin molding by an organic liquid composition exhibiting high carbon residual yield in an inert gas atmosphere. Thus, the process can transmit a driving force generated in a voice coil to the diaphragm without loss and without ageing fatigue, such as a creep of the materials irrespective of external environments.

REFERENCES:
patent: 3626042 (1971-12-01), Appleby et al.
patent: 4395814 (1983-08-01), Tsukagoshi et al.
patent: 4456645 (1984-06-01), Chi
patent: 4855093 (1989-08-01), Yoshida

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