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:
Mar. 17, 1998
Filed:
Jul. 03, 1996
Applicant:
Inventor:
Amir Alon, Sunnyvale, CA (US);
Assignee:
Zen Research N.V., Curacao, AN;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4432 ; 369 4441 ; 369 4423 ; 2502015 ;
Abstract
Methods and apparatus are provided for generating focus, tracking, and magnification error signals in an multi-track optical disk reader. An optical pickup assembly for the disk reader includes an optical sensor having multiple sensor elements. Some of the sensor elements contain multiple divisions whose outputs are summed to produce tracking, focus, and magnification error signals. Electronic and optical mechanical systems are provided for correcting or compensating for magnification errors caused by an optical pickup assembly of a multi-track optical disk reader.