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:
Feb. 23, 1993
Filed:
Oct. 30, 1989
Applicant:
Inventor:
Yoshihiro Utsumi, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G01J / ;
U.S. Cl.
CPC ...
369 13 ; 360 59 ; 360114 ; 369110 ; 369 4441 ; 365122 ; 2502015 ;
Abstract
A magneto-optical reproducing device in which a reflected light signal from a magneto-optical disk is divided by an astigmatic analyzer. The analyzer both divides the light signal according to linear polarization, for data signal detection, but also introduces astigmatism in one of the divided beams to allow focus detection.