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:
Oct. 04, 1989
Applicant:
Inventors:
Toshimasa Hangai, Tokorozawa, JP;
Koichi Ishitoya, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4411 ; 369 4425 ; 369 33 ; 369 43 ;
Abstract
An apparatus for detecting a deviation of reading position for use in a disc player. A detection signal of the deviation of reading position is generated if a sync signal to be extracted from the read-out signal is not yielded for a predetermined time period under the presence of a lock detection signal which is produced when the focus servo system is in a locking condition. Owing to this structure, the deviation of the information reading light spot from a proper position is surely detected without enlarging the scale of circuits in the disc player.