Piezoelectric actuator

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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Details

C310S328000, C310S340000

Reexamination Certificate

active

11717798

ABSTRACT:
The piezoelectric actuator includes a piezoelectric element (2) including a sheet of piezoelectric ceramic and electrodes formed at least part of the surface of the sheet of piezoelectric ceramic, and a holding member (4) holding the piezoelectric element (2);The piezoelectric at least one of the requirements (a) to (e) described below;(a) The bulk density shall be equal to or smaller than 5 g/cm3, and the Young's modulus Y11Ecalculated according to a resonance-antiresonance method shall be equal to or larger than 90 GPa;(b) The coefficient of thermal conductivity shall be equal to or larger than 2 Wm−1K−1;(c) The coefficient of thermal expansion shall be equal to or larger than 3.0 ppm/° C. over a temperature range from −30° C. to 160° C.;(d) The pyroelectric coefficient shall be equal to or smaller than 400 μCm−2K−1over the temperature range from −30° C. to 160° C.;(e) The mechanical quality factor Qm calculated according to the resonance-antiresonance method shall be equal to or smaller than 50 over a temperature range from −30° C. to 80° C.

REFERENCES:
patent: 6884364 (2005-04-01), Sato et al.
patent: 2004/0127344 (2004-07-01), Sato et al.
patent: 1 283 553 (2003-02-01), None
patent: 11-180766 (1999-07-01), None
patent: 2003-046154 (2003-02-01), None
patent: 2003-128460 (2003-05-01), None
patent: 2004-115293 (2004-04-01), None

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