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. 15, 2011
Filed:
Jun. 17, 2010
Takeshi Yamamoto, Yokohama, JP;
Yoshinobu Baba, Yokohama, JP;
Manami Haraguchi, Yokohama, JP;
Kenta Kubo, Suntoh-gun, JP;
Takeshi Yamamoto, Yokohama, JP;
Yoshinobu Baba, Yokohama, JP;
Manami Haraguchi, Yokohama, JP;
Kenta Kubo, Suntoh-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, and the developer bearing member being applied with an alternate voltage in order to form an alternate electric field between the developer bearing member and the image bearing member, wherein assuming that electric field intensities Eb and Ed be Eb=|(Vp−VL)/D| and Ed=|(Vp−VL)/D|, a relationship, 0≧K>K, is satisfied, where K: a gradient at Ed, and K: a gradient at Eb, and wherein a resistivity ρb of the carrier at the electric field intensity Eb satisfies 1.1×10×e<ρb<6.0×10[Ω·m] (where: e is the base of natural logarithms; and n=4×Eb×10).