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:
Mar. 17, 2015
Filed:
Mar. 11, 2014
Shingo Suzuki, Kanagawa, JP;
Satoshi Kaneko, Kanagawa, JP;
Tetsuya Muto, Kanagawa, JP;
Shuji Hirai, Tokyo, JP;
Shinichi Akatsu, Kanagawa, JP;
Keita Gotoh, Kanagawa, JP;
Yuuichiroh Uematsu, Kanagawa, JP;
Shingo Suzuki, Kanagawa, JP;
Satoshi Kaneko, Kanagawa, JP;
Tetsuya Muto, Kanagawa, JP;
Shuji Hirai, Tokyo, JP;
Shinichi Akatsu, Kanagawa, JP;
Keita Gotoh, Kanagawa, JP;
Yuuichiroh Uematsu, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes a latent-image bearing body, a charging unit, a latent-image writing unit, a development unit, a development power, and a bias control unit. After a start of an image forming operation, the bias control unit performs a process of constantly maintaining an output of a development bias at an adjustment bias value. The adjustment bias value is a central value in a periodic fluctuation range of the output of the development bias. At a timing at which a difference of the development bias from the adjustment bias value in the periodic fluctuation range is less than or equal to a predetermined threshold value, the bias control unit performs switching from the process of constantly maintaining the output of the development bias at the adjustment bias value to a process of periodically changing the output of the development bias based on development bias control data.