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:
Jun. 22, 1982
Filed:
Dec. 03, 1980
Hiroaki Tsuchiya, Tokyo, JP;
Ikuo Soma, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The ratio of the length of the light path between an original to be copied and a lens to the length of the light path between the lens and a photosensitive medium is changed by the copying magnification changing operation. That is, for example, the lens is brought nearer to the photosensitive medium. After this magnification changing operation, a reference light is thrown upon the photosensitive medium through the lens. The potential of the area of the photosensitive medium illuminated by the reference light is detected, and the output of photosensitive medium charging means is controlled correspondingly to that potential.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile