Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-04-01
2008-04-01
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S328000, C310S340000
Reexamination Certificate
active
07352113
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.
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Homma Takahiko
Nagaya Toshiatsu
Nakamura Masaya
Nonoyama Tatsuhiko
Saito Yasuyoshi
Budd Mark
Denso Corporation
Harness Dickey & Pierce PLC
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