Diaphragm for acoustic instruments and method of manufacturing t

Details Diaphragm for acoustic instruments and method of manufacturing t Diaphragm for acoustic instruments and method of manufacturing t

1979-11-28

1982-09-28

Fuller, Benjamin R.

Acoustics

Diaphragm

Critically defined material or coating

428408, G10K 1300

Patent

active

043514120

ABSTRACT:
A honeycomb shaped diaphragm for use in acoustic instruments such as speakers is manufactured by kneading a mixture of flaky graphite powder and thermoplastic resin, preferably polyvinyl chloride, rolling the mixture into a plate, forming honeycomb recesses in the plate, and mating two recessed plates with each other so that the corresponding recesses form closed cavities. The formed plate may be carbonized before assembly. The resultant diaphragm shows a high Young's modulus, a low apparent density and a remarkably high specific modulus of elasticity ensuring improved acoustic characteristics.

REFERENCES:
patent: 2308305 (1943-01-01), Reynolds
patent: 3399103 (1968-08-01), Salyer et al.
patent: 3399104 (1968-08-01), Ball et al.
patent: 3404061 (1968-10-01), Shane et al.
patent: 3416992 (1968-12-01), Amos
patent: 3674109 (1972-07-01), Murase
patent: 3922412 (1975-11-01), Yoshikawa et al.
patent: 4035536 (1977-07-01), Morrison
patent: 4146668 (1979-03-01), Dorey et al.
patent: 4198550 (1980-04-01), Matsuda et al.

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