Horology: time measuring systems or devices – Chronological – With power monitor
Reexamination Certificate
2005-02-28
2010-02-16
Miska, Vit W (Department: 2833)
Horology: time measuring systems or devices
Chronological
With power monitor
C368S157000, C368S204000, C310S317000
Reexamination Certificate
active
07663978
ABSTRACT:
In an electronic device1comprising a battery200and a piezoelectric actuator A, a power source voltage before drive control is started is maintained by a sample holding circuit102,a reference voltage is set by a reference voltage generating circuit103on the basis of the power source voltage, and a control circuit106stops driving when the power source voltage falls below a drive stop voltage as compared by a second comparison circuit105,and begins driving the piezoelectric actuator A again when the power source voltage exceeds the reference voltage as compared by a first comparison circuit104.Therefore, the device can be more easily reduced in size by using a small power source, and the driving time can be markedly reduced using an intermittent driving procedure that corresponds to the conditions of the battery voltage.
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Kawaguchi Takashi
Kitahara Joji
Okeya Makoto
Global IP Counselors, LLP
Miska Vit W
Seiko Epson Corporation
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