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. 05, 1991
Filed:
Sep. 14, 1990
Applicant:
Inventors:
Eiji Okuda, Osaka, JP;
Hiroyuki Nemoto, Osaka, JP;
Assignee:
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359619 ; 427165 ; 427169 ; 359652 ; 385124 ; 385130 ;
Abstract
A flat plate optical element and a method for preparing the same are disclosed, which flat plate optical element comprises an optical element with a predetermined pattern formed by ion diffusion from a restricted region within a flat substrate, wherein an ion diffusion layer having a uniform thickness is formed with the same ions as those used for forming the optical element on the whole surface of the substrate opposite to the surface on which the optical element is formed, and the total volume of the optical element is substantially equal to the total volume of the ion diffusion layer.