Electrophotographic reversal development method using magnetic f

Details Electrophotographic reversal development method using magnetic f Electrophotographic reversal development method using magnetic f

1988-04-18

1989-09-12

Welsh, J. Davis

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430122, 355268, 355251, G03G 1309

Patent

active

048659363

ABSTRACT:
A reversal development method comprising the steps of forming a latent electrostatic image on the surface of an image-carrying member having predetermined charging characteristics; supplying a developer to a non-magnetic, conductive sleeve containing a magnetic field-generating means and positioned opposite to the image-carrying member, the developer comprising a magnetic toner consisting essentially of a resin and magnetic powder and adapted to be charged with the opposite polarity to that of the latent electrostatic image; conveying the developer onto the image-carrying member surface by relative rotation of the sleeve to the magnetic field-generating means; and applying DC voltage of the same polarity as that of the latent electrostatic image to the sleeve so that the magnetic toner is attracted to the nonimage areas of the latent electrostatic image. The present invention can provide high-quality images with high optical density and resolution substantially without suffering from dispersed toner dust adhesion.

REFERENCES:
patent: 2846333 (1955-11-01), Wilson
patent: 4021358 (1977-05-01), Tomono et al.
patent: 4350749 (1982-09-01), Ohnuma

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