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:
Oct. 17, 2006
Filed:
Apr. 27, 2004
Yusuke Hasegawa, Shizuoka, JP;
Yuichi Mizoo, Ibaraki, JP;
Tadashi Dojo, Shizuoka, JP;
Nene Shibayama, Shizuoka, JP;
Tomohisa Sano, Shizuoka, JP;
Yusuke Hasegawa, Shizuoka, JP;
Yuichi Mizoo, Ibaraki, JP;
Tadashi Dojo, Shizuoka, JP;
Nene Shibayama, Shizuoka, JP;
Tomohisa Sano, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an image forming apparatus having at least an amorphous silicon photosensitive member, a magnetic toner developing means and a color developer developing means, the magnetic toner has a weight-average particle diameter (D) of from 4.0 μm to 10.0 μm and a ratio thereof to number-average particle diameter (D), D/D, of from 1.0 to 2.0, and the number of magnetic particles not passing through a mesh with an opening of 34 μm which are contained in the unit volume of the magnetic toner is from 3.5 to 105. This image forming apparatus can not easily cause faulty cleaning performance even in using the magnetic toner and the non-magnetic color toners in combination and has superior environmental stability and running stability even where toners made to have small particle diameter are used or process speed is high.