Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-11-15
1995-05-16
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
381192, 381193, 381202, H04R 2500
Patent
active
054167515
ABSTRACT:
An electroacoustic transducer converts an electric signal into sound by vibrating a diaphragm magnetically in response to the electric signal input thereto. A movement restricting means for restricting the movement of the diaphragm within an allowable movement range is provided on the inner wall of a resonant chamber disposed at one side of the diaphragm. The restricting means normally confronts at a magnetic member attached to the center of the diaphragm. The restriction means contacts the magnetic member when the diaphragm attempts a deflection beyond the allowable range.
REFERENCES:
patent: 2490227 (1949-12-01), Murkham
patent: 4399334 (1983-08-01), Kakiuchi et al.
patent: 4803733 (1989-02-01), Carver et al.
patent: 5150419 (1992-09-01), Kizak et al.
Fushimi Isao
Imahori Yoshio
Nito Katsutoshi
Eldred J. Woodrow
Star Micronics Co. Ltd.
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