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. 08, 2001
Filed:
Oct. 25, 1999
Makoto Ohki, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
It is an object of this invention to provide an image forming apparatus having a plurality of image processing patterns in which to form an image and capable of improving the convenience and reducing the control time. The density variation of a printing pattern is 0.6 times (b/a) that of a photographic pattern. Experiments confirmed that this relationship exhibits substantially the same value even when the change is caused by some other image density characteristic change factor, such as a surrounding environmental change. Therfore, in forming a look-up table on the basis of density information of a gradation control patch, gradation control is so performed that a look-up table for the plurality of printing patterns is formed on the basis of information of a look-up table formed using the photographic pattern.