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:
Aug. 18, 1998
Filed:
Jun. 20, 1996
Applicant:
Inventors:
Noriaki Nishi, Chiba, JP;
Kimihiro Saito, Saitama, JP;
Shuichi Matsumoto, Kanagawa, JP;
Masato Hattori, Chiba, JP;
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369110 ; 369112 ;
Abstract
An optical pickup includes a polarization component separation element which is formed as a unit or single piece of birefringence material. The separation element is not laminated obviating the need to carefully match the optical axes of the laminated pieces. Multiple reflections within the birefringent crystal which comprises the separation element improves the separation and resolution of the polarized components which are extracted from a laser beam reflected back off the media surface.