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:
Jul. 20, 1993
Filed:
Nov. 26, 1991
Applicant:
Inventors:
Assignee:
Olympua Oprixl Co. Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G01J / ;
U.S. Cl.
CPC ...
369 4441 ; 369 4432 ; 2502015 ;
Abstract
A photodetector to be used to produce a track error signal or the like by receiving the reflected light of light beams radiated to an optical recording medium is formed of a plurality of photodetecting devices provided as divided on a common chip and is provided with either a; leaking current absorbing member for suppressing a leaking current form overflowing through the chip from the photodetecting device receiving a light beam of a large light amount into the other photodetecting devices causing noises; or with a circuit for preventing the generation of a leaking current.