Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2011-06-28
2011-06-28
Dougherty, Thomas M (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S315000, C310S317000
Reexamination Certificate
active
07969063
ABSTRACT:
A driver, including: a piezoelectric element extending and contracting upon application of an electrical voltage; a driving member having one end secured to the piezoelectric element; a frictionally coupling member, frictionally coupling the driving member; and a drive circuit, connected with a power supply to activate the piezoelectric element at a predetermined period, including: a charge switching element for connecting an electrode of the piezoelectric element with the power supply, a discharge switching element, and a protective resistor arranged in an electric path between the power supply and the piezoelectric element or between the piezoelectric element and a ground point, wherein a resistance value of the protective resistor is set larger than an ON resistance of the switching element but smaller than a value obtained by dividing one half of the drive period of the switching element by a capacitance of the piezoelectric element, in a predetermined period.
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Dougherty Thomas M
Konica Minolta Opto Inc.
Sidley Austin LLP
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