Method and image-forming apparatus for forming at least two tone

Details Method and image-forming apparatus for forming at least two tone Method and image-forming apparatus for forming at least two tone

1998-05-21

1999-10-05

Grimley, Arthur T.

Electrophotography

Image formation

Development

4301066, 430122, G03G 1501

Patent

active

059637641

ABSTRACT:
A method of, and image-forming device for, forming at least two toner images in register on a rotatable charge retentive medium. To that end, within one revolution of the charge retentive medium, the method: applies a first charge image according to a first image; develops a first toner image in accordance with the first charge image on the charge retentive medium by applying a first unary electrically conductive and magnetizable toner, e.g., via a first magnetic brush; applies a second charge image according to a second image; and develops a second toner image in accordance with the second charge image on the charge retentive medium by applying a second unary electrically conductive and magnetizable toner, e.g., via a second magnetic brush. The toner should have an electrical conductivity between 1 and 10.sup.-7 (ohm.cm).sup.-1. If the charge retentive medium is a photoconductor, then the method includes: charging the photoconductive medium; and exposing the photoconductive medium in accordance with the first and the at least second image, respectively.

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