Diaphragms for acoustic instruments and method of producing the

Details Diaphragms for acoustic instruments and method of producing the Diaphragms for acoustic instruments and method of producing the

1979-09-24

1982-10-05

Hix, L. T.

Acoustics

Diaphragm

Critically defined material or coating

428338, 428402, 428408, G10K 1300

Patent

active

043524079

ABSTRACT:
A diaphragm for acoustic instruments such as speakers is produced by blending and kneading a thermoplastic resin such as polyvinyl chloride resin with graphite powder, rolling the blend into a sheet until graphite particles are oriented, and forming the sheet into a desired diaphragm shape. The diaphragm of the composite material containing graphite particles oriented shows an improved combination of density, elasticity and internal loss.

REFERENCES:
patent: 2308305 (1943-01-01), Reynolds
patent: 3404061 (1968-10-01), Shane et al.
patent: 3416992 (1968-12-01), Amos
patent: 4221773 (1980-09-01), Tsukagoshi et al.

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