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. 25, 2002
Filed:
Sep. 09, 1999
Applicant:
Inventors:
Toshihiko Otsubo, Numazu, JP;
Tetsuro Fukusaka, Susono, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02N 2/00 ;
U.S. Cl.
CPC ...
H02N 2/00 ;
Abstract
This invention relates to a driving control device for a vibration wave motor. A periodic change in frequency of a driving periodic signal is detected during driving of the motor, a frequency corresponding to the detected change is set as a lower limit value, and the driving frequency is controlled not to drop below the lower limit value, thereby preventing the motor from abruptly stopping due to a motor load drift.