Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-12-17
1984-02-07
Rubinson, G. Z.
Electrical generator or motor structure
Dynamoelectric
Rotary
310326, H04R 1700
Patent
active
044305290
ABSTRACT:
A piezoelectric loudspeaker having a bending mode piezoelectric diaphragm mounted on a diaphragm stretched across a frame, the piezoelectric diaphragm being supported at its central portion to a support provided at the frame, so that the central portion of piezoelectric diaphragm is stationary free from vibrations, thereby being higher in a sound pressure level and smaller in acoustic distortion than the conventional loudspeaker.
REFERENCES:
patent: 2810082 (1957-10-01), Tibbetts
patent: 3584245 (1971-06-01), Helfen
patent: 3761956 (1973-09-01), Takahashi
patent: 3786202 (1974-01-01), Schafft
patent: 4012604 (1977-03-01), Speidel
patent: 4283605 (1981-08-01), Nakajima
patent: 4292561 (1981-09-01), Martin
Nakagawa Nobuhiko
Yoshii Tsutomu
Murata Manufacturing Co. Ltd.
Rubinson G. Z.
Schroeder L.
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