Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce color reproduction
Patent
1980-12-17
1983-05-17
Martin, Jr., Roland E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce color reproduction
430 31, 430 57, 430363, 430945, G03G 1301
Patent
active
043840337
ABSTRACT:
A photographic member includes an electrically conductive substrate which carries a pair of photoconductive layers thereon, which are charged to opposite polarities from each other, as will be further defined herein. The photosensitive member has a surface potential which is of either positive or negative polarity. Subsequently, the photosensitive member is imagewise exposed to light image formed by light of a wavelength which principally renders only one of the photoconductive layers conductive. Areas of the photosensitive member which are irradiated by the light radiation during the imagewise exposure is subjected to a line scanning by a light spot having an extremely small diameter and of a wavelength which principally renders the other conductive layer conductive either simultaneously with or after the imagewise exposure. The spot has a reference light intensity, which is modulated by a pair of write signals. One of the write signals effects an intensity modulation so that the light intensity of the spot becomes substantially zero while the other write signal effects an intensity modulation which increases the light intensity of the spot above the reference intensity. As a result of the line scanning, the pair of write signals produces an electrostatic latent image in the form of a distribution of surface potentials of opposite polarities. The electrostatic latent image which is formed by the line scanning and an electrostatic latent image formed by the imagewise exposure are both converted into visual images by a developing step using a pair of toners which are charged to opposite polarities from each other.
REFERENCES:
patent: 3909254 (1975-09-01), Tamai et al.
patent: 4149798 (1979-04-01), McGowan et al.
patent: 4189224 (1980-02-01), Sakai
patent: 4250239 (1981-02-01), Sakai
patent: 4281051 (1981-07-01), Sakai
Dunne Gerard F.
Martin Jr. Roland E.
Ricoh & Company, Ltd.
Shoup Guy W.
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