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:
Jan. 07, 1992
Filed:
Feb. 14, 1991
Shinichiro Kuwabara, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A track-jump device for a disc drive apparatus for jump from one track to a neighboring track on a disc-like recording medium. A tracking error signal S.sub.TE, an on-track signal S.sub.OT whose phase is deviated by 90.degree. relative to the tracking error signal according to displacement in the direction of track width and which exhibits a peak value when it is on the track, a signal S.sub.TE having a phase opposite to the tracking error signal, and signal S.sub.OT having a phase opposite to the on-track signal are successively switched by a switch (20) and are sent to a tracking device circuit (27) to effect the track-jump. The servo operation is continued even during the track-jump, and the servo loop is not interrupted. Therefore, track-jump is effected while maintaining advantage in regard to safety, reproducibility, and compatibility of pickups.