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:
Apr. 29, 2003
Filed:
Oct. 17, 2001
Satoru Nakamura, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus lessens the sense of incongruity between CMY mixture gray and K monochrome gray so as to achieve an easy color adjustment. An adjustment sheet is printed by the image forming apparatus. The adjustment sheet has a reference pattern and a plurality of test patterns. The reference pattern indicates a reference concentration of gray and the test patterns indicates concentrations of gray within a predetermined concentration range including the reference concentration. The gray of the test patterns is a mixture of cyan, magenta, yellow and black. The gray of the reference pattern is monochromatic black. The test patterns are visually compared with the reference pattern so as to select one of the test patterns of which concentration matches the concentration of the reference pattern. The concentration of gray is adjusted in accordance with the concentration of the selected one of test patterns.