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. 20, 2009
Filed:
Feb. 28, 2006
Yasuo Miyoshi, Yokohama, JP;
Hajime Oyama, Ebina, JP;
Katsuhiro Aoki, Yokohama, JP;
Hiroshi Ikeguchi, Saitama, JP;
Daichi Yamaguchi, Hino, JP;
Yasuo Miyoshi, Yokohama, JP;
Hajime Oyama, Ebina, JP;
Katsuhiro Aoki, Yokohama, JP;
Hiroshi Ikeguchi, Saitama, JP;
Daichi Yamaguchi, Hino, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A developing device including a rotating developing roller bearing toner thereon, capable of developing an electrostatic latent image with the toner; a toner layer forming member configured to form a toner layer on the developing roller, and charge the toner of the toner layer at a nip between the developing roller and the toner layer forming member; and a toner supplying device configured to supply fresh toner to the developing device, wherein a charge quantity (q) of the toner on the developing roller varies according to the following equation q(t)=A·{1−exp(−t/t)} wherein t represents a nip passing time of the toner on the developing roller, trepresents a time constant of charging the toner, and A represents a constant, and wherein the time constant tis smaller than a rotation time of the developing roller per rotation; and an image forming apparatus and a process cartridge using the developing device.