Process of making a diaphragm of vitreous hard carbonaceous mate

Details Process of making a diaphragm of vitreous hard carbonaceous mate Process of making a diaphragm of vitreous hard carbonaceous mate

1989-08-03

1990-07-03

Thurlow, Jeffery

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156327, 1563309, 156333, 156337, 264 296, 264 297, 264250, 423449, B29C 6554, C01B 3102

Patent

active

049388290

ABSTRACT:
A process for producing a diaphragm for an acoustic device, the diaphragm being formed of vitreous hard carbonaceous material, including the steps of preliminarily molding, in film or sheet shapes, vitreous hard carbon thermosetting resin which, upon calcining, exhibits high hardness and gas impermeability, molding a diaphragm in a desired diaphragm shape and a voice coil bobbin in a desired voice coil bobbin shape from said preliminary moldings, calcining the diaphragm molding and the voice coil bobbin molding, and forming an integral structure of the diaphragm and the voice coil bobbin by calcining in an inert gas atmosphere, a composite material comprising the diaphragm molding and the voice coil bobbin molding with an organic liquid composition positioned therebetween, the organic liquid composition exhibiting high carbon residual yield. Thus, the diaphragm can transmit a driving force generated in a voice coil to the diaphragm without loss, without aging fatigue (such as creep) of the material, irrespective of external environments (such as temperature and moisture) and with excellent heat resistance in an integral structure of the diaphragm.

REFERENCES:
patent: 3626042 (1971-12-01), Appleby et al.
patent: 4221773 (1980-09-01), Tsukagoshi et al.
patent: 4456645 (1984-06-01), Chi
patent: 4550015 (1985-10-01), Korb et al.

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