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:
Dec. 08, 1992
Filed:
Feb. 06, 1990
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A tracking control apparatus of an optical signal recording/reproduction apparatus, records and reproduces a data signal by causing a light spot focused on an optical recording medium to trace data-recording tracks and then accesses the light spot to a desired track. The tracking control apparatus varies a tracking-servo target value in a direction of performing the track-jumping operation, and then, if the tracking error signal exceeds a predetermined position level, the tracking control apparatus repeatedly varies the polarity of the tracking error signal until the light spot eventually arrives at the target track subject to the track-jumping operation. By virtue of the structure mentioned above, the tracking control apparatus can stably perform the track-jumping operation even when external disturbances, such as vibration, occur in the servo system.