Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hidetsugu Shimura0
Takashi Hama0
Date of Patent
July 31, 2007
0Patent Application Number
113784250
Date Filed
March 20, 2006
0Patent Primary Examiner
Patent abstract
Optimization of a density control factor accompanying formation of a patch image is executed every time a predetermined period of time elapses since the end of a preceding image forming operation. Since an image is formed at regular intervals in this manner, it is possible to suppress a density variation which is created as toner carried on a developer roller is left unused for long. This effect further improves when the developer roller is rotated idle prior to formation of a patch image or regularly at predetermined timing.
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