Process for two color imaging comprising a photoreceptor having a unipolar hole transporting layer
AssigneeXerox Corporation
InventorGeoffrey M. T. Foley
Life of this patent
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Abstract
A photoreceptor for use in a two color electrostatic imaging process is disclosed which comprises a conductive substrate layer; a first photogenerating layer overlaying the substrate layer which is sensitive to a first wavelength; a unipolar hole transporting layer overlaying the first photogenerating layer; and a second photogenerating layer overlaying the hole transporting layer which is sensitive to a second wavelength and at least partially transmits the first wavelength; wherein the transporting layer is substantially transparent to the first wavelength. An apparatus for forming multi-color images of an object employing the photoreceptor of the invention, wherein the color images are properly registered with respect to each other, is also disclosed.
Claims26
An electrostatic imaging process for duplication of an original having discrete areas of black and a second highlight color selected from the group consisting of red and blue, said process comprising:
- (a) forming an electrostatic image on a photoreceptor, said photoreceptor comprising:
- (1) a conductive substrate layer;
- (2) a first photogenerating layer overlaying said substrate layer which is sensitive to a first wavelength;
- (3) a unipolar hole transporting layer overlaying said first photogenerating layer;
- and
- (4) a second photogenerating layer overlaying said hole transporting layer which is sensitive to a second wavelength and at least partially transmits said first wavelength;
- wherein said transporting layer is substantially transparent to said first wavelength, and wherein said electrostatic image is formed by at least one constant current charge/exposure cycle;
- and
- (b) developing said electrostatic image with toner particles of black and said second color which are oppositely charged.
Dependencies are inferred from the claim text.