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:
May. 27, 2008
Filed:
Apr. 12, 2006
Kenya Ogawa, Susono, JP;
Yasushi Shimizu, Shizuoka-ken, JP;
Shuji Moriya, Shizuoka-ken, JP;
Kazunari Hagiwara, Numazu, JP;
Naoto Kichijima, Mishima, JP;
Koichi Okuda, Tokyo, JP;
Kenya Ogawa, Susono, JP;
Yasushi Shimizu, Shizuoka-ken, JP;
Shuji Moriya, Shizuoka-ken, JP;
Kazunari Hagiwara, Numazu, JP;
Naoto Kichijima, Mishima, JP;
Koichi Okuda, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus having a rotatable developing sleeve having an elastic layer on the surface thereof for carrying a mono-component magnetic developer and urged against a photosensitive drum to develop an electrostatic image formed on the drum with the developer, a non-rotary magnet provided inside the sleeve for magnetically attracting the developer to the sleeve, and a blade having an abutting portion abutting against the sleeve in a counter direction for regulating the amount of the developer on the sleeve, a step portion spaced apart from the abutting portion, and a separating portion provided upstream of the step portion in the rotation direction of the sleeve, wherein the surface of the sleeve to which the separating portion is opposed includes a position satisfying |Br|/|B|≧0.5, where B(G): the magnitude of magnetic flux density formed on the surface of the sleeve, and Br(G): a component of the magnetic flux density in a direction perpendicular to the surface of the sleeve.