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:
May. 15, 1990
Filed:
Aug. 02, 1989
Applicant:
Inventors:
Ichiro Morishita, Iwanuma, JP;
Hiroko Hanzawa, Shiroishi, JP;
Assignee:
Alps Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350432 ;
Abstract
An objective lens for an optical memory device comprising a plane surface on one side thereof for emitting a luminous flux oppositely to a disk, and an aspherical surface on the other of the side thereof for receiving a luminous flux reversely to the disk in such a manner that the following conditions (1) and (2) are satisfied: