Electro-acoustic transducer

Details Electro-acoustic transducer Electro-acoustic transducer

1981-07-15

1983-10-18

Rubinson, G. Z.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

1791155DV, 1791155VC, 179181R, 179181F, 181167, 181169, 181170, H04R 700, H04R 900

Patent

active

044107684

ABSTRACT:
In an electro-acoustic transducer in a loud speaker and like devices, a diaphragm and/or a voice coil bobbin is or are formed by a composite material consisting of a foamed resin containing reinforcing fibers. Such diaphragm has a large Young's modulus-to-density ratio E/.rho., a large internal loss tan.delta. and a large flexural rigidity E.I, and thus it exhibits good characteristics in sound reproducing. Such voice coil bobbin which is an electric insulator can have a small thickness and is light in weight and has a large mechanical strength, and thus it is free from adversely affecting the vibration of the diaphragm, and accordingly, the sound reproduced.

REFERENCES:
patent: 3033945 (1962-05-01), Villchur
patent: 3111187 (1963-11-01), Barlow
patent: 3930130 (1975-12-01), Baszor
patent: 4042746 (1977-08-01), Hofer
patent: 4315557 (1982-02-01), Nakaya et al.
patent: 4344503 (1982-08-01), Nakamura et al.
Product Engineering, "Simple Plastic Process Yields High Performance Cellular Cores", Aug. 1973, pp. 40-41.
Calvin J. Binning, Plastic Foams: The Physics and Chemistry of Product Performance and Process Technology, John Wiley & Sons, 1969, p. 14.

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