US Patent 7515844 Image density control method and image forming apparatus

Patent 7515844 was granted and assigned to RICOH COMPANY,LTD. on April, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

75158440

Patent Inventor Names

Yuji Hirayama0

Shin Hasegawa0

Shinji Kato0

Takashi Enami0

Kayoko Tanaka0

Kazumi Kobayashi0

Kiichirou Shimizu0

Kohta Fujimori0

...

Date of Patent

April 7, 2009

Patent Application Number

115610530

Date Filed

November 17, 2006

Patent Primary Examiner

‌

Sandra L. Brase

Patent abstract

An image density control method for an image forming apparatus in which, in order to keep the development capability constant over time, the toner density in the developer is manipulated to an appropriate range by changing the toner density control reference value in accordance with the toner replacement amount in a fixed time period by ascertaining changes in the image coverage of the output images, and by changing the image forming conditions at predetermined execution intervals.

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