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:
Aug. 11, 1992
Filed:
Apr. 29, 1991
Tatuya Wada, Saitama, JP;
Hiroshi Hikita, Saitama, JP;
Nobutaka Machida, Saitama, JP;
Mituharu Nonami, Saitama, JP;
Yukinori Kawamura, Yokosuka, JP;
Tomohiro Takigawa, Tokyo, JP;
Saburou Gotou, Tokyo, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
A driving power unit for a piezoactivator is disclosed that utilizes a semiconductor switching device for supplying power to the piezoelement. When the voltage measured across the piezoelement attains a predetermined valve, the semiconductor switching device turns off. Sensing devices cause the switching device to turn on upon the voltage dropping by a predetermined margin and cause the voltage source to turn off when the switching device remains on beyond a predetermined time period. Memory and logic circuitry also control the switching sequence of the switching device.