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:
Nov. 21, 2006
Filed:
Feb. 11, 2004
Masato Yanagida, Tokyo, JP;
Hiroyuki Nagashima, Yokohama, JP;
Naohiro Kumagai, Kawasaki, JP;
Toshio Koike, Kawasaki, JP;
Atsushi Sampe, Yokohama, JP;
Masanori Kawasumi, Yokohama, JP;
Eisaku Murakami, Suginami-ku, JP;
Takeshi Uchitani, Kamakura, JP;
Tokuya Ohjimi, Numazu, JP;
Masami Tomita, Numazu, JP;
Takeshi Shintani, Kawasaki, JP;
Masato Yanagida, Tokyo, JP;
Hiroyuki Nagashima, Yokohama, JP;
Naohiro Kumagai, Kawasaki, JP;
Toshio Koike, Kawasaki, JP;
Atsushi Sampe, Yokohama, JP;
Masanori Kawasumi, Yokohama, JP;
Eisaku Murakami, Suginami-ku, JP;
Takeshi Uchitani, Kamakura, JP;
Tokuya Ohjimi, Numazu, JP;
Masami Tomita, Numazu, JP;
Takeshi Shintani, Kawasaki, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A charging device including: a charging roller having a metal cylinder and an elastic layer located on the metal cylinder; a cleaner configured to clean the charging roller, which includes an electroconductive brush roller including a roller having a shaft; and hair located overlying the roller, wherein the hair includes a fiber which has a width of from 0.1 to 20 denier, and a length of from 0.3 to 2.5 mm and which is planted at a density of from 7,000 to 46,000 lines/cm, and a member configured to impart substantially the same potential as that of the charging roller to the electroconductive brush roller when a bias voltage is applied to the charging roller. A process cartridge and an image forming apparatus including the charging device are also provided.