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:
Jan. 04, 1983
Filed:
Jul. 08, 1981
Satoshi Hisabayoshi, Hachioji, JP;
Masahiro Kogiso, Fussa, JP;
Yousuke Igarashi, Tachikawa, JP;
Yoshio Horiguchi, Hachioji, JP;
Iwatsu Electric Co., Ltd., Tokyo, JP;
Abstract
In a copying machine of the type comprising an image projecting lens movable in a direction of an optical axis thereof for varying a magnifying power, a reflecting mirror interlocked with the lens for effecting focusing, and two groups of light sources for illuminating a manuscript, there is provided an exposure control system comprising variable resistors driven by the projecting lens, oscillators for generating pulse signals of frequencies varying in accordance with resistance variations of the variable resistors and with a variation in a source voltage, counters counting the number of the pulse signals in accordance with an exposure index, and switch means for lighting the light sources during intervals determined by an exposure index.