Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-03-11
1995-10-24
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310358, 310332, 73 2905, H01L 4108
Patent
active
054612748
ABSTRACT:
A humidity-sensitive actuator includes a plate made of piezoelectric electrostrictive ceramic having a variable electric resistance region having a high moisture absorbing capability and defining a flat electrode attachment surface, and a high, fixed electric resistance region having a low moisture absorbing capability and defining a flat electrode attachment surface. The variable electric resistance region is joined to the high, fixed electric resistance region with electrodes on the flat electrode attachment surface on opposite sides of the plate for applying an electric voltage transversely through the plate. Under a high humidity condition, when the voltage is applied transversely across the plate through the electrodes by a power supply, an electric field is applied in different proportions to the variable and high, fixed electric resistance regions, which thereby contract by smaller and larger lengths, respectively, and produce a flexural displacement of the plate to serve as a humidity-sensitive actuator.
REFERENCES:
patent: 3671784 (1972-06-01), Mitchell
patent: 4533849 (1985-08-01), Schnell
patent: 4686409 (1987-08-01), Kaarmann et al.
patent: 4928264 (1990-05-01), Kahn
patent: 5142187 (1992-08-01), Saito et al.
patent: 5221872 (1993-06-01), Nishida et al.
Miyayama Masaru
Yanagida Hiroaki
Yuji Isogai
Budd Mark O.
Honda Giken Kogyo Kabushiki Kaisha
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