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:
Dec. 09, 2014
Filed:
Aug. 07, 2013
Applicants:
Taku Satoh, Kanagawa, JP;
Yasunobu Takagi, Kanagawa, JP;
Toshihito Kamei, Tokyo, JP;
Takashi Kimura, Kanagawa, JP;
Inventors:
Taku Satoh, Kanagawa, JP;
Yasunobu Takagi, Kanagawa, JP;
Toshihito Kamei, Tokyo, JP;
Takashi Kimura, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J 2/12 (2006.01); H04N 1/60 (2006.01); B41J 2/21 (2006.01);
U.S. Cl.
CPC ...
B41J 2/12 (2013.01); H04N 1/6033 (2013.01); B41J 2/2146 (2013.01); B41J 2/2128 (2013.01);
Abstract
An image forming apparatus that performs correction to make gradation values adding both of two head areas (A+C, B+D) approximately equal. An area whose density is the lowest is set as a target density. Assuming densities for head areas A=70, B=100, C=40, D=90, head areas B and D are corrected with correction amount that ΔB become equal to ΔD (ΔB=ΔD=40) in accordance with target value (A+C=100).