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:
Aug. 09, 1983
Filed:
Jan. 08, 1982
Applicant:
Inventor:
Yukio Kanazawa, Kanagawa, JP;
Assignee:
Fuji Xerox Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
355 / ; 355 / ; 355 55 ;
Abstract
A copying machine has an optical mechanism which varies a back focal length of a lens. A control circuit generates a control signal so that the optical mechanism changes the back focusing length of the lens so the lens is first focused on an upper surface of a microfilm and then on a lower surface of the microfilm. An optical sensor generates separate light quantity signals for each focusing position of the lens and these signals are held and compared in a circuit which then determines which surface of the microfilm bears a picture. The optical mechanism then appropriately adjusts the back focal length of lens.