Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-12-31
1984-03-27
Rubinson, G. Z.
Electrical generator or motor structure
Dynamoelectric
Rotary
310321, H01L 4108
Patent
active
044396406
ABSTRACT:
A piezoelectric loudspeaker thin plate-like shaped and using a piezoelectric ceramic plate for a sound-generating portion, which comprises a disc-shaped diaphragm formed of a metallic plate, a disc-shaped film using a material of a smaller Q-factor and formed about equal in diameter to the disc-shaped diaphragm, and a disc-shaped piezoelectric ceramic plate smaller in diameter than the disc-shaped diaphragm, these three members being stuck concentrically with each other, so that the integral-stuck member is supported at its outer peripheral portion to a frame.
REFERENCES:
patent: 4368401 (1983-01-01), Martin
Murata Manufacturing Co. Ltd.
Rubinson G. Z.
Schroeder L. C.
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