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. 01, 1979
Filed:
Nov. 10, 1977
Applicant:
Inventor:
Yasuo Inoue, Hachiouji, JP;
Assignee:
Olympus Optical Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
350122 ; 350129 ;
Abstract
A screen means free from ghost image comprising a screen and Fresnel lens arranged so that its Fresnel surface faces the screen. The Fresnel lens is arranged that optically inactive surfaces of its Fresnel surface become approximately parallel with the advancing direction of projected rays entered through and refracted by the back surface of the Fresnel lens.