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. 15, 1988
Filed:
Jul. 08, 1986
Applicant:
Inventors:
Susumu Nomura, Saitama, JP;
Takanori Maeda, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250201 ; 369 45 ;
Abstract
An optical pickup for astigmatic focusing on an optical disk. A planar beam splitter reflects light from a source through an objective lens to the recording track of the disk. The light reflected from the disk is transmitted through the beam splitter. The beam splitter is inclined to the optical axis so that astigmatism is produced on transmission. A cylindrical lens is placed along the path of the transmitted light and is oriented so that the combined astigmatism is aligned with a quadruple element detector.