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. 20, 1982
Filed:
Nov. 08, 1979
Applicant:
Inventors:
Osamu Kamiya, Machida, JP;
Nobuyuki Sekimura, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350165 ; 350166 ;
Abstract
In a copying machine including a halogen lamp, a CdS photosensitive medium and a transmitting type projection lens system, a 5-layer or 7-layer multi-layered interference film comprising a dielectric material is applied to a surface of the transmitting type projection lens system so that a spectral distribution comprising the spectral wavelength characteristic of the original light, the spectral transmission characteristic of the multi-layered interference film and the spectral sensitivity characteristic of the photosensitive medium superposed one upon another becomes a uniform distribution.