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. 14, 1991
Filed:
Nov. 22, 1989
Haruo Nishiyama, Kyoto, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An automatic exposure device for a copying machine includes a lamp for exposing an original, a power source for variably supplying electric power to the lamp, a first sensor for determining the quantity of light reflected from the original, a second sensor for determining the quantity of light of the lamp, a controller for increasing the electric power supplied to the lamp by the power source proportionally to decrease in the quantity of the light determined by the first sensor, and a maximum electric poewr setting device for setting the maximum electric power applicable to the lamp by the power source at a high level proportional to decrease in the quantity of light determined by the second sensor.