Developing apparatus having adjacent similar magnetic poles

Details Developing apparatus having adjacent similar magnetic poles Developing apparatus having adjacent similar magnetic poles

1993-11-10

1996-02-13

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118658, G03G 1509

Patent

active

054915414

ABSTRACT:
The present invention is characterized in that two magnetic poles of a magnetic member which are positioned to confront a nipping region between a sleeve and a photoreceptor in neighboring relation with each other are of the same polarity. These neighboring poles of the same polarity produce a distribution of magnetic flux density having first and second local maximum points and a local minimum point therebetween. A central angle .theta.1 between a line extending from a center of the magnetic member to the first local maximum point and a line extending the center to the local minimum point is smaller than a central angle .theta.2 between the line extending from the center to the local minimum point and a line extending from the center to the second local maximum point. Further, a developer material retained by the magnetic force of attraction generated by the neighboring magnetic poles of same polarity are kept in contact with the electorostatic latent image bearing member.

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