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:
Apr. 28, 1992
Filed:
Sep. 20, 1990
Applicant:
Inventor:
Hisami Nishi, Osaka, JP;
Assignee:
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359654 ; 385124 ;
Abstract
A graded-index lens for focusing an erect unmagnified image out of the lens has a refractive index varying radially in a cross-sectional plane normal to the optical axis thereof. The graded-index lens comprises a cylindrical medium whose refractive index at a radial distance r from an optical axis within a cross-sectional plane normal to the optical axis, is expressed by: