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. 13, 2007
Filed:
Apr. 25, 2005
Hiroshi Nakai, Kanagawa, JP;
Yasuo Suzuki, Shizuoka, JP;
Nozomu Tamoto, Shizuoka, JP;
Takahiko Tokumasu, Tokyo, JP;
Kazahiko Watanabe, Tokyo, JP;
Kohichi Ohshima, Shizuoka, JP;
Noboru Tsukude, Kanagawa, JP;
Nekka Matsuura, Kanagawa, JP;
Hiroshi Ikuno, Kanagawa, JP;
Hiroshi Nakai, Kanagawa, JP;
Yasuo Suzuki, Shizuoka, JP;
Nozomu Tamoto, Shizuoka, JP;
Takahiko Tokumasu, Tokyo, JP;
Kazahiko Watanabe, Tokyo, JP;
Kohichi Ohshima, Shizuoka, JP;
Noboru Tsukude, Kanagawa, JP;
Nekka Matsuura, Kanagawa, JP;
Hiroshi Ikuno, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an object to be charged whose surface moves. A charging device for charging the object uses an electrical discharge generated by applying a voltage including an alternating current component to a charging member provided in contact with or in proximity to the object. A latent image forming device forms an electrostatic latent image on the surface of the object. A developing device causes a two-component developer to come into contact with the image portion of the electrostatic latent image formed by the latent image forming device and affixes toner thereto. A protective substance is present on the surface of the object in the discharge region for charging the object, and the saturation magnetization of the carrier of the two-component developer with respect to an applied magnetic field of 1000 oersted is 40 to 80 emu/g.