Method for forming negative and positive images in electrophotog

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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4301066, G03G 914

Patent

active

046525106

ABSTRACT:
Disclosed is an electrophotographic process which comprises developing an electrophotographic light-sensitive layer having an electrostatic charge image of a certain polarity with a one-component type magnetic developer where positive and negative frictional charge polarities are mingled, under development bias voltage conditions capable of developing the electrostatic charge image, the background or both, and bringing the light-sensitive layer having a developer layer formed thereon into contact with a transfer sheet under a transfer charge of the same polarity as that of the electrostatic charge image when a positive image is formed or under a transfer charge of a polarity reverse to that of the electrostatic charge image when a negative image is formed, to form an image on the transfer sheet.

REFERENCES:
patent: 4342822 (1982-08-01), Hosono et al.
patent: 4350749 (1982-09-01), Ohnuma et al.
patent: 4395476 (1983-07-01), Kanbe et al.
patent: 4430411 (1984-02-01), Tamura et al.
patent: 4487825 (1984-12-01), Gruber et al.

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