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. 17, 1999
Filed:
Apr. 21, 1997
Applicant:
Inventors:
Takatoshi Ashizawa, Kawasaki, JP;
Tadao Takagi, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
318116 ; 310316 ; 310323 ;
Abstract
A drive control device for ultrasonic motors (actuators), including a driving unit for driving the ultrasonic motors, a detecting device for detecting the characteristics of each of two ultrasonic motors and generating a signal indicating the difference in the characteristics, and an output difference controlling unit for controlling the driving unit based on the signal from the detecting device, thereby regulating the difference in the outputs of the two ultrasonic motors.