Process for reversal development

Details Process for reversal development Process for reversal development

G - Physics

03

G

117/2.3

G03G 13/09 (2006.01)

Patent

CA 1123680

ABSTRACT OF THE DISCLOSURE A process for reversal development of an electrical potential pattern is provided. Said pattern is formed by imagewise exposure of a uniformly charged photoconductive layer. The charging of the layer is rest- ricted to such a level below its breakdown-voltage that the contact between the photoconductive layer and the toner powder used in the development step is insulating. For development, a magnetisable and inductively attractable toner powder is used. The toner powder is applied by means of a magnetic brush device, the conductive development roller of which is provided with the electrical potential required for reversal development. Preferably the photo- conductive layer is charged to a level of at most 35-75% of its breakdown- voltage. A scorotron may be used for the charging. The photoconductive layer may comprise a photoconductive polymer and/or a bisazo-pigment or "pink" zinc oxide as the photosensitive compound.

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