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:
Jul. 10, 1990
Filed:
Apr. 13, 1989
Applicant:
Inventors:
Takao Honda, Kawasaki, JP;
Yoshiaki Kobayashi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355251 ; 355245 ; 118658 ;
Abstract
A developing apparatus wherein a developer is carried on a rotatable developing sleeve having a magnet therein into a developing zone where the sleeve and a image bearing member carrying an image to be developed is opposed to each other. A tangential component of a magnetic field formed on the sleeve surface by a developing magnetic pole disposed faced to the developing zone changes with an angular position on the sleeve. A change rate thereof has a local maximum or local minimum not less than 30 Gausses per degree. By this, 'tails' and 'scattered spots' are prevented from being produced on a developed image.