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:
Oct. 12, 1993
Filed:
Jun. 06, 1991
Hiroshi Matsumoto, Fujisawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An image forming apparatus has an illumination lamp and a controller for varying the intensity of light rays from the illumination lamp in accordance with a first base density area and a second image density area. The first density will be determined in accordance with detected values of highest and lowest degrees of brightness and highest and lowest degrees of darkness. Similarly, the second density will be determined in accordance with detected values of highest and lowest degrees of brightness and highest and lowest degrees of darkness. Differences between these values will be determined and then normalized. A conformity-determining section will find a voltage-controlling rule most similar to the normalized differences and the rule will be used to control the illumination lamp.