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:
Aug. 16, 2011
Filed:
Mar. 04, 2005
Haruji Mizuishi, Ohta-ku, JP;
Tokuya Ojimi, Kawasaki, JP;
Toshio Koike, Kawasaki, JP;
Takeshi Shintani, Kawasaki, JP;
Yuji Arai, Kawasaki, JP;
Takuzi Yoneda, Ohta-ku, JP;
Ken Amemiya, Nerima-ku, JP;
Takaaki Tawada, Yokohama, JP;
Masami Tomita, Numazu, JP;
Masanori Kawasumi, Yokohama, JP;
Takaya Muraishi, Kawasaki, JP;
Hiroomi Harada, Kawasaki, JP;
Hiromichi Ninomiya, Yokohama, JP;
Haruji Mizuishi, Ohta-ku, JP;
Tokuya Ojimi, Kawasaki, JP;
Toshio Koike, Kawasaki, JP;
Takeshi Shintani, Kawasaki, JP;
Yuji Arai, Kawasaki, JP;
Takuzi Yoneda, Ohta-ku, JP;
Ken Amemiya, Nerima-ku, JP;
Takaaki Tawada, Yokohama, JP;
Masami Tomita, Numazu, JP;
Masanori Kawasumi, Yokohama, JP;
Takaya Muraishi, Kawasaki, JP;
Hiroomi Harada, Kawasaki, JP;
Hiromichi Ninomiya, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The present invention provides a charging device which comprises a charging roller () and a cleaning component (). The charging roller charges a surface of an image-recording medium () with a voltage which is applied from an external source. The cleaning component cleans a surface of the charging roller. The charging roller includes a resistance adjustment layer which is made of a resin composite and formed on an outer periphery of a core metal. The hardness of the charging roller is 45 degrees or more in JIS D hardness. The cleaning component has a portion which is in contact with the charging roller. This portion is made of resin foam which has a continuous foam structure. The density of the resin foam is 5 to 15 kg/mand its tensile strength is 1.7±0.5 kg/cm.