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:
Dec. 07, 2004
Filed:
Jul. 02, 2003
Yoshihisa Ashikawa, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image forming apparatus includes a photoconductive drum, a charging roller to charge the photoconductive drum, a thermistor to detect an ambient temperature of the photoconductive drum. A ROM stores impedance characteristics data that is obtained in advance by experiments and that represent a relationship between the ambient temperature of the photoconductive drum and an impedance between the charging roller and the photoconductive drum. Current ambient temperature of the photoconductive drum detected, current impedance between the charging roller and the photoconductive drum is calculated from the current ambient temperature of the photoconductive drum and the impedance characteristics data, and a voltage applied to the charging roller is adjusted based on the current impedance.