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. 19, 2015
Filed:
Mar. 10, 2009
Tomoko Endo, Odawara, JP;
Koh Ishigami, Mishima, JP;
Naoki Okamoto, Mishima, JP;
Yoshinobu Baba, Yokohama, JP;
Tomoko Endo, Odawara, JP;
Koh Ishigami, Mishima, JP;
Naoki Okamoto, Mishima, JP;
Yoshinobu Baba, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
Provided is a two-component developer containing: a magnetic carrier obtained by coating a magnetic core with a resin; and toner, in which: the magnetic core contains at least a ferrite component and at least one kind of an oxide selected from the group consisting of SiOand AlO; the content of the oxide is 4.0 mass % or more and 40.0 mass % or less with respect to the magnetic core; the magnetic core has a specific resistance of 5.0×10Ω·cm or more and 5.0×10Ω·cm or less at the time of the application of 1,000 V/cm; the magnetic carrier has an intensity of magnetization in 79.6 kA/m of 40.0 Am/kg or more and 65.0 Am/kg or less, and a residual magnetization after the application of an external magnetic field of 79.6 kA/m of 3.0 Am/kg or less; and the toner has a weight-average particle diameter (D4) of 3.0 μm or more and 10.0 μm or less and an average circularity of 0.940 or more and 0.990 or less.