Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce color reproduction
Patent
1979-04-25
1982-01-12
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce color reproduction
430 55, 430 57, G03G 1301
Patent
active
043106102
ABSTRACT:
A photoconductive member (11) has a conductive substrate (11a) on which is formed a first photoconductive layer (11b) which is insensitive to red light but sensitive to at least one other color component of white light and a second photoconductive layer (11c) formed on the first layer (11b) which is sensitive to red light. A first electrostatic charge of a first polarity is formed at the interface between the first and second layers (11b), (11c). A second electrostatic charge of a second polarity is formed on the second layer (11c). A light image having black, white and red areas is radiated onto the second layer (11c). The white light causes both layers (11b), (11c) to conduct and dissipate all charge. The red light causes only the second layer (11c) to conduct to form a bipolar electrostatic image. Black toner which is electrostatically charged to the first polarity and red toner which is electrostatically charged to the second polarity are applied to the member ( 11) to form a bicolor toner image which is fixed to the member (11) or transferred to a copy sheet and fixed thereto. The magnitude of the second charge is sufficiently smaller than the magnitude of the first charge to allow formation of a bipolar elctrostatic image in which the positive and negative image areas have electrostatic potential magnitudes sufficient to constitute electrostatic images for electrostatography.
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Alexander David G.
Goodrow John L.
Ricoh & Company, Ltd.
Schilling Richard L.
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