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:
Nov. 24, 1992
Filed:
May. 17, 1990
Friedrich Fuldner, Villingen-Schwenningen, DE;
Gunter Gleim, Villingen-Schwenningen, DE;
Deutsche Thomson-Brandt GmbH, Villingen, DE;
Abstract
An arrangement for track skipping in a track control circuit with an optical scanner, in which two light beams reflected from an information medium, strike each onto a separate photodetector. The two outputs of the photodetectors are subtracted to generate a sine-shaped track error signal representing a difference between a track being scanned and a desired track to be scanned. The track control circuit is supplied at the beginning of track skipping with an offset quantity for skipping across a number of tracks. This offset quantity is dimensioned so that a light beam incident on the information medium for tracking data thereon, becomes displaced by a predetermined amount of track center and thereby radiates partially on the track being scanned and partially on the space between the track being scanned and an adjacent track. The track error signal becomes inverted by an amount equal to twice the number of tracks skipped. The offset quantity becomes separated from the track control circuit earliest after the first inversion and latest after the last inversion of the track error signal. The track control circuit remains closed during track skipping.