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:
Aug. 15, 1995
Filed:
Jan. 25, 1994
Tomoaki Yokoyama, Aichi, JP;
Makoto Takase, Toyokawa, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A twin magnetic pole type developing apparatus of the present invention includes a rotatable sleeve enclosing a non-rotatable magnetic member therein. The magnetic member has two magnetic poles of the same polarity which are positioned so as to confront a developing region in neighboring relation with each other. Developer material to be used is a two-component type developer material consisting of toner particles and carrier particles. Especially, the carrier particles have an average particle size of 25 .mu.m or more and are capable of being magnetized to an intensity of magnetization of 30 emu/g or more. Further, a packing density in the developing region ranges from 5% to 40%. Consequently, the developer material can contact with an electrostatic latent image formed on a photoreceptor to develop it into the image of high density.