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:
Feb. 04, 1997
Filed:
Oct. 26, 1994
Kazuaki Matsumoto, Kawasaki, JP;
Hiroto Kitai, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an optical information recording/reproducing apparatus, relative movement between an optical head and an optical information recording medium having a linear track is performed to cause a light beam irradiated by the optical head to follow the information track so as to effect recording/reproduction of information. The apparatus is provided with an ultrasonic wave motor for driving one of the recording medium and the optical head relative to each other. The ultrasonic wave motor is controlled to gradually decrease a drive velocity thereof at the end of a drive operation thereof and to gradually increase the drive velocity thereof at the beginning of the drive operation thereof by properly adjusting an amplitude of a drive signal to be supplied to the ultrasonic wave motor.