Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-05-06
2008-05-06
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07368850
ABSTRACT:
A resonance control apparatus100includes a VCO10which generates a reference signal having a predetermined frequency, a divider20which divides the predetermined frequency of the reference signal, a phase reference forming section50which delays a phase of the divided signal for a predetermined interval, a voltage comparator40which compares a voltage of the output signal from a piezoelectric sensor2for detecting the driving state of a piezoelectric load3in synchronization with the driving of the piezoelectric load3with a predetermined voltage, a phase comparator60which compares the phase of the output signal from the voltage comparator40with the phase of the output signal from the phase reference forming section50,and a duty control section30for controlling a duty ratio of the drive signal supplied to the piezoelectric load3based on the reference signal.
REFERENCES:
patent: 4965532 (1990-10-01), Sakurai
patent: 5563478 (1996-10-01), Suganuma
patent: 5767609 (1998-06-01), Suganuma
patent: 6339368 (2002-01-01), Leith
patent: 03-243183 (1991-10-01), None
patent: 03-289375 (1991-12-01), None
patent: 2000-175069 (2000-06-01), None
Budd Mark
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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