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. 06, 1990
Filed:
May. 25, 1989
Applicant:
Inventor:
Ikuo Kasuga, Komagane, JP;
Assignee:
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
2502015 ; 350171 ; 350433 ; 350434 ; 350447 ; 369 4423 ;
Abstract
An optical pickup using a parallel plane plate type beam splitter is disclosed, in which the astigmatism produced by the fact that the light beam passes through the beam splitter is compensated by means of a correcting lens having anisotropically curved surfaces.