The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2010
Filed:
Feb. 28, 2005
Takashi Kawaguchi, Shiojiri, JP;
Joji Kitahara, Shiojiri, JP;
Makoto Okeya, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
In an electronic devicecomprising a batteryand a piezoelectric actuator A, a power source voltage before drive control is started is maintained by a sample holding circuita reference voltage is set by a reference voltage generating circuiton the basis of the power source voltage, and a control circuitstops driving when the power source voltage falls below a drive stop voltage as compared by a second comparison circuitand begins driving the piezoelectric actuator A again when the power source voltage exceeds the reference voltage as compared by a first comparison circuitTherefore, 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.