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:
May. 07, 1991
Filed:
Apr. 23, 1990
Toyoji Sasaki, Tokyo, JP;
Olympus Optical Co., Ltd., , JP;
Abstract
A circuit for driving an ultrasonic motor which is driven by being applied with multi-phase alternating voltages comprises: a digital oscillator for providing a signal having a frequency higher than that of said alternating voltages; a frequency divider for dividing the frequency of the output signal of the digital oscillator into a desired frequency to provide a basic clock signal; a plurality of presetting circuits, each of independently presetting a delay time for generating a plurality of delay clocks which are delayed with respect the basic clock by different delay times; a plurality of delay circuits, each connected with a respective one of the delay time presetting means for generating a plurality of different delayed clock which are delay with respect to said basic clock by different periods of delay time in accordance with the preset delay time; and voltage generators which generates multi-phase alternating voltages from the basic clock and plurality of the delayed clocks for applying the multi-phase alternating voltages upon the ultrasonic motor.