Electrical generator or motor structure – Educational or construction units or kits
Patent
1975-02-12
1976-09-21
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
310 82, 310 85, H01L 4108
Patent
active
039821439
ABSTRACT:
A piezoelectric electro-acoustic transducer which includes a diaphragm having a piezoelectric property, a base plate of a stiff material, and a resilient backing member which is compressedly covered at one side with the base plate and brought into contact at the other side with the diaphragm to provide the diaphragm with resiliency and/or tension, characterized in that the base plate is provided at one side adjacent said backing member with a surface which has a concave and/or a convex curvature to provide the diaphragm with different suitable pressures through said backing member, whereby it has become possible to improve the frequency characteristics, particularly, the low frequency characteristics of the transducer and a high conversion efficiency thereof.
REFERENCES:
patent: 2549872 (1951-04-01), Willard
patent: 2565159 (1951-08-01), Williams
patent: 3832580 (1974-08-01), Yamamuro et al.
Oyaba Takashi
Tamura Masahiko
Budd Mark O.
Pioneer Electronic Corporation
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