Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-02-13
2008-12-02
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S316020, C310S323020, C310S369000
Reexamination Certificate
active
07459830
ABSTRACT:
A piezoelectric actuator includes: a ring-shaped piezoelectric element, vibration of the piezoelectric element being transmitted to an object; a first vibration area and a second vibration area provided on both sides of a bisector bisecting the piezoelectric element along a diameter of the piezoelectric element, the first vibration area and the second vibration area being respectively provided with at least one drive electrode to which a drive signal is supplied, the drive electrode being arranged substantially axisymmetrically with respect to the bisector, the drive signal including a phase-advance drive signal and a phase-delay drive signal having a predetermined drive phase difference, the phase-advance drive signal that is phase-advanced relative to the phase-delay drive signal being supplied to one of the first vibration area and the second vibration area and the phase-delay drive signal that is phase-delayed relative to the phase-advance drive signal being supplied to the other of the first vibration area and the second vibration area; and a detection electrode that detects vibrating condition of the piezoelectric element to output a vibration signal, the detection electrode being provided on at least one of the first vibration area and the second vibration area to which the phase-delay drive signal is supplied, the drive of the piezoelectric actuator being controlled based on a detected phase difference between one of the phase-advance drive signal and the phase-delay drive signal and the vibration signal.
REFERENCES:
patent: 5214339 (1993-05-01), Naito
patent: 6051911 (2000-04-01), Kojima et al.
patent: 6072266 (2000-06-01), Tomikawa
patent: 7005776 (2006-02-01), Iino et al.
patent: 2000-004590 (2000-01-01), None
patent: 2004-166324 (2004-06-01), None
patent: 2005-086884 (2005-03-01), None
patent: 2005-086991 (2005-03-01), None
Budd Mark
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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