Speaker

Details Speaker Speaker

1989-01-30

1991-06-04

Isen, Forester W.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

181161, 381152, H04R 2500

Patent

active

050220845

ABSTRACT:
An elastic material such as rubber is employed as the material of a diaphragm and the diaphragm is constructed in such a state that tension is made to exist intrinsically therein, whereby the vibration of the diaphragm when the vibration is applied to it has a large amplitude at the center thereof, gets smaller when approaching the perimeter thereof and finally reaches zero at the edge portion. Accordingly, almost no phenomenon occurs in which air in front and air in the rear of the diaphragm interfere with each other, a speaker box is not required and a tone of good quality may be reproduced.

REFERENCES:
patent: 1554794 (1922-10-01), DeForest
patent: 1717146 (1929-06-01), Crouch
patent: 1790679 (1931-02-01), Seely
patent: 1817630 (1931-08-01), Kroesen
patent: 2868894 (1959-01-01), Schultz
patent: 3674946 (1972-07-01), Winey
patent: 3937905 (1976-02-01), Manger
patent: 4029171 (1977-06-01), Manger
patent: 4343376 (1982-08-01), Tsukagoshi et al.

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