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:
Jan. 13, 2009
Filed:
Nov. 14, 2005
Takuzi Yoneda, Tokyo, JP;
Hiroshi Ono, Tokyo, JP;
Masanori Kawasumi, Kanagawa, JP;
Yuji Arai, Kanagawa, JP;
Toshio Koike, Kanagawa, JP;
Ken Amemiya, Tokyo, JP;
Tokuya Ohjimi, Kanagawa, JP;
Takatsugu Fujishiro, Tokyo, JP;
Masami Tomita, Shizuoka, JP;
Haruji Mizuishi, Tokyo, JP;
Hitoshi Ishibashi, Kanagawa, JP;
Takuzi Yoneda, Tokyo, JP;
Hiroshi Ono, Tokyo, JP;
Masanori Kawasumi, Kanagawa, JP;
Yuji Arai, Kanagawa, JP;
Toshio Koike, Kanagawa, JP;
Ken Amemiya, Tokyo, JP;
Tokuya Ohjimi, Kanagawa, JP;
Takatsugu Fujishiro, Tokyo, JP;
Masami Tomita, Shizuoka, JP;
Haruji Mizuishi, Tokyo, JP;
Hitoshi Ishibashi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus including an image bearing member, a charging member, and a measuring member. The image forming member is configured to bear an image. The charging member is configured to charge a surface of the image bearing member when a direct current bias voltage is added to at least an alternating bias voltage which is applied to the charging member, and has a frequency fc of the alternating bias voltage. The measuring member is configured to measure a potential of the surface of the image bearing member, and has a drive frequency fvsen. The relationship of the frequency fc and the drive frequency fvsen is expressed as fc≠fvsen×n and fc×n≠fvsen.