Piezoelectric actuator

Details Piezoelectric actuator Piezoelectric actuator

2007-03-13

2008-10-28

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C257S347000, C257S062000

Reexamination Certificate

active

07443085

ABSTRACT:
A piezoelectric actuator1includes a piezoelectric element2, which has a pair of electrodes formed on the surface of a piezoelectric ceramic member, as a drive source. The piezoelectric actuator1satisfies at least one of the following requirements (a) to (c):(a) the variation width WCin an apparent dynamic capacity C [F] due to a change in temperature should fall within ±11% over a specific temperature range from −30° C. to 80° C.;(b) the variation width WLin a displacement L [μm] due to a change in temperature should fall within ±14% over the specific temperature range from −30° C. to 80° C.; and(c) the variation width WL/Cin a quotient L/C due to a change in temperature should fall within ±12% over the specific temperature range from −30° C. to 80° C., wherein C [F] denotes the apparent dynamic capacity and L [μm] denotes the displacement.

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