Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1984-11-21
1987-02-03
Goodrow, John L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
4301066, 430120, G03G 1308
Patent
active
046408835
ABSTRACT:
The invention disclosed relates to a method of forming composite images or dichromatic copy images free from fog. The method includes the first step of forming on an electrostatic latent image bearing surface electrostatic latent images having at least three different potential levels, the first and second latent images being represented respectively by a first potential and a second potential relative to a common background area potential; the second step of developing the first and second images by first magnetic brush developing means using two kinds of toners at least one of which is magnetic and which are chargeable to polarities opposite to each other, with application to a developing electrode of a bias voltage capable of depositing the magnetic toner on the background potential area, to selectively deposit the two toners on the first and second latent images and to deposit the magnetic toner on the background potential area, while collecting the deposited magnetic toner at least from the background potential area by second magnetic brush developing means; and the third step of transferring the developed images.
REFERENCES:
patent: 4346982 (1982-08-01), Nakajima et al.
patent: 4349270 (1982-09-01), Wada et al.
patent: 4525447 (1985-06-01), Tanaka et al.
Goodrow John L.
Minolta Camera Kabushiki Kaisha
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