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. 24, 1998
Filed:
Feb. 27, 1996
Applicant:
Inventors:
Kiyoshi Toyota, Tokyo, JP;
Kimihiro Saito, Saitama, JP;
Noriaki Nishi, Chiba, JP;
Hitoshi Tamada, Kanagawa, JP;
Shuichi Matsumoto, Kanagawa, JP;
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369112 ; 369110 ;
Abstract
An optical pickup and an optical recording medium reproducing apparatus smaller and more reliable than conventional optical pickups and optical recording medium reproducing apparatuses. These are provided with a one-dimensional metal grid which is formed so that the ratio h/d that the pitch 'd' and the thickness of metal conductors 'h' constituting the wire grid is about 0.1 or more, and also a group of light receiving units which receive light beams split by the one-dimensional metal grid.