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:
May. 20, 2014
Filed:
Oct. 11, 2007
Ken Yoshida, Chigasaki, JP;
Ken Yoshida, Chigasaki, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image forming apparatus includes an image carrier, a transferer to apply a constant-current controlled bias to a transfer medium to form a transfer electric field, a constant-current source configured to apply an electrical current to the transferer, an electrical characteristic detector, an environment detector, a first corrector, a second corrector, and a third corrector. The electrical characteristic detector detects an electrical characteristic value corresponding to a resistance in a current path from the constant-current source to the transferer. The environment detector detects an environmental condition inside the image forming apparatus. The first corrector corrects the electrical current based on the electrical characteristic detection and a predetermined threshold. The second corrector corrects the electrical current based on the environment detection. The third corrector sets the threshold based on the environment detection.