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. 18, 2008
Filed:
Feb. 05, 2007
Masaki Ojima, Mishima, JP;
Masahito Kato, Susono, JP;
Nobuyoshi Yoshida, Shizuoka-ken, JP;
Satoru Inami, Numazu, JP;
Tadashi Dojo, Numazu, JP;
Masaki Ojima, Mishima, JP;
Masahito Kato, Susono, JP;
Nobuyoshi Yoshida, Shizuoka-ken, JP;
Satoru Inami, Numazu, JP;
Tadashi Dojo, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus, a process cartridge and an image forming apparatus which form an image whose image density can be maintained, which form a fogged image and which form an image of uneven density within an acceptable range, even when the diameter of a developer carrying member is not more than 12 mm. The apparatus includes a developer carrying member whose outer diameter is in the range of 8 mm to 12 mm, and a magnetic mono-component developerhaving a saturation magnetization of in a range of 20 Am/kg to 37 Am/kg when the magnetic field of 79.6 kA/m (1000 oersteds) is applied, the magnetization of not less than 70% and not more than 80% of the saturation magnetization when the magnetic field is lowered to 55.7 kA/m (700 oersteds), and the magnetization of not less than 50% and not more than 62% of the saturation magnetization when the magnetic field is lowered to 39.8 kA/m (500 oersteds).