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:
Jan. 14, 1997
Filed:
Jan. 10, 1995
Kokichi Terajima, Tokyo, JP;
Akai Electric Co., Tokyo, JP;
Abstract
A vibration control apparatus that can impart self-induced vibration by stabilizing the vibrator at a frequency in near agreement with its mechanical resonance frequency vibration f.sub.s is provided. A vibrator has a pair of piezo-electric elements on the side surface of vibration member having a resonance point. A drive apparatus has signal output terminal that outputs the drive signal of vibrator. First and second feedback amplifiers each have feedback input terminals. A third feedback amplifier has a feedback input terminal and a signal input terminal. The feedback input terminals of the first and second feedback amplifiers are connected to one electrode of each of the piezo-electric elements. The feedback input terminal of the third feedback amplifier is connected to the other electrodes of the pair of piezo-electric elements. The signal input terminal is connected to signal output terminal of drive apparatus. A signal based on the output signal of third feedback amplifier is fed back to the drive apparatus to impart self-induced vibration to the vibrator.