Single pass, two-color electrophotographic reproduction machine

Claim 1

In an electrophotographic reproduction machine for printing two color output copies of an original document in a single pass, the original document having black information on a neutral background and at least one area covered with a colored fluorescent material which absorbs incident radiation within a specific wavelength range and which re-emits the absorbed radiation at a higher wavelength range, the machine including: a xerographic imaging system comprising a photoconductor member, means for charging the surface of said member, optical means adapted to form a latent electrostatic image of said original on the surface of said photoconductor member, said latent image having a first discharge level corresponding to the black image areas of the original document, a second discharge level corresponding to the area on the original document covered by the colored fluorescent material, and a third discharge level corresponding to the background areas of the original document, means for developing said latent image in at least two colors, means for transferring said developed image to a copy sheet, and means for fusing said transferred image.

Claim 9

A method for producing a two color copy of an original document in a single pass including the steps of: creating an original document having black image areas on a neutral background and at least one area covered with a colored fluorescent material which absorbs radiation below a first wavelength and re-emits light over a second, higher wavelength range, illuminating said document with an illumination source which has at least some light components within said first wavelength range, filtering the light reflected from the document so as to transmit radiation within said second range while blocking radiation within said first wavelength range, projecting said filtered reflected light onto the surface of a monopolar photoconductor to form a latent electrostatic image thereon said latent image having a first discharge level corresponding to the black image areas of the original document, a second discharge level corresponding to the colored fluorescent area of the original document and a third discharge level corresponding to the background areas of the original document, developing said latent image with a two color developer means adapted to cause development of said first and second discharge levels with a black and color toner, transferring the two colored developed image to a copy medium, and fusing the transferred image onto the copy sheet.

Claim 10

A method for producing a two color copy of an original document in a single pass including the steps of: creating an original document having black image areas on a neutral background and at least one area covered with a colored fluorescent material which absorbs radiation below a first wavelength and re-emits light over a second, higher wavelength range, illuminating said document with an illumination source which has at least some light components within said first wavelength range, filtering the light reflected from the document so as to transmit radiation within said second range while blocking radiation within said first wavelength range, projecting said filtered reflected light onto the surface of a monopolar photoconductor to form a latent electrostatic image thereon said latent image having a first discharge level corresponding to the black image areas of the original document, a second discharge level corresponding to the colored fluorescent area of the original document and a third discharge level corresponding to the background areas of the original document, developing said latent image with a two color developer means adapted to cause development of said first and second discharge levels with a black and color toner, transferring the two colored developed image to a copy medium, and fusing the transferred image onto the copy sheet.