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:
Jun. 20, 1989
Filed:
Feb. 08, 1988
Keiji Takada, Tokorozawa, JP;
Masahide Okumura, Sagamihara, JP;
Satoru Fukuhara, Kokubunji, JP;
Toshiyuki Morimura, Hachioji, JP;
Sumio Hosaka, Nishitama, JP;
Shigeyuki Hosoki, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed herein are a piezoelectric actuator control apparatus comprising a capacitor connected in series with a piezoelectric actuator that has electrodes, and a control device that controls the voltage applied to the piezoelectric actuator such that the voltage of the capacitor will reach a predetermined value, as well as a piezoelectric actuator control apparatus comprising an integrating circuit connected to one electrode of a piezoelectric actuator that has electrodes, and a control device that controls the voltage of the other electrode of the piezoelectric actuator such that the output of the integration circuit will assume a predetermined magnitude.