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:
Nov. 25, 1986
Filed:
Dec. 23, 1983
Applicant:
Inventors:
Yoshiyuki Tsukai, Tokorozawa, JP;
Akihiro Tachibana, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G11B / ;
U.S. Cl.
CPC ...
350-372 ; 35016217 ; 369109 ;
Abstract
An optical pickup device to be used in a system for optically playing back recorded information comprises a diffraction grating or a hologram lens instead of a prism for directing a read-out light beam emitted by a light source to the surface of the recording medium and separating a reflection beam reflected by the surface of a recording medium from the read-out light beam. By the elimination of the prism, the size of the pickup device is substantially reduced and the production cost of the device is also reduced.