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:
Jun. 03, 2008
Filed:
Apr. 12, 2006
Naoto Kichijima, Mishima, JP;
Koichi Okuda, Tokyo, JP;
Yasushi Shimizu, Shizuoka-ken, JP;
Kenya Ogawa, Susono, JP;
Shuji Moriya, Shizuoka-ken, JP;
Kazunari Hagiwara, Numazu, JP;
Naoto Kichijima, Mishima, JP;
Koichi Okuda, Tokyo, JP;
Yasushi Shimizu, Shizuoka-ken, JP;
Kenya Ogawa, Susono, JP;
Shuji Moriya, Shizuoka-ken, JP;
Kazunari Hagiwara, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus includes a developing roller for developing an image with a developer; a non-rotary magnet roll inside the roller; a blade; and an abutting member abutting against the roller, wherein the following expressions are satisfied: |Vs|>|Vdev|, |Br|/|B|≦0.5, and L/(BH×R)≧0.1, where |Vdev|: a DC component Vdev of a voltage applied to the roller, |Vs|: a DC component Vs of a voltage applied to the member, B(G): the magnetic flux density formed on the surface of the roller at the abutting position by the magnet roll, Br(G): the component of the magnetic flux density B(G) perpendicular to the surface of the roller, and L(mm): the abutting width between the roller and the member, BH(rad): the half value width of the component Bθ(G) horizontal to the surface of the roller, and R(mm): the radius of the roller.