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:
Jul. 25, 2000
Filed:
Mar. 11, 1997
Applicant:
Inventors:
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03F / ; H04N / ;
U.S. Cl.
CPC ...
382167 ; 358519 ; 358521 ; 358504 ; 358406 ;
Abstract
In a copying machine, a printer control unit calculates .gamma. correction data according to a grid potential Vg and a development bias potential Vb which are image forming parameters, and a calculation coefficient. The printer control unit reads reflectance data of a copied test pattern in a test pattern read out mode to correct the calculation coefficient for the calculation of .gamma. correction data according to the read out data. Thus, .gamma. correction at always the optimum and accurate level can be carried out without usage of a memory of a large capacity.