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. 01, 1989
Filed:
Dec. 08, 1986
Applicant:
Inventors:
Tomoaki Yamada, Yokohama, JP;
Yuwa Ishii, Kawasaki, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369120 ; 369 13 ; 369110 ;
Abstract
An optical pickup apparatus comprises two photodetectors disposed on one and the same substrate. The light beam from the recording medium is divided into two light components by an optical member and the two light components are guided to the two photodetector positioned on the same substrate.