Patent ID: 6028616
Filing Date: 2000-02-22
Classification: G03G,H04N

Abstract:
A method of creating process color images in two passes of a charge retentive structure though a plurality of process stations, said method including the steps of:uniformly charging a charge retentive structure of an imaging device to a uniform voltage level;in a first pass of said charge retentive structure through a plurality of processing stations, creating tri-level latent electrostatic images comprising first CAD and DAD images at two different voltage levels, background areas at a third voltage level and a first virtual image at a voltage level which is substantially the same as said background areas;developing said first CAD and DAD images with two different color inks;conditioning said first virtual image for forming a developable DAD image;developing said developable DAD image formed by said step of conditioning with ink of a different color from said two different colors;in a second pass of said charge retentive structure through a plurality of processing stations, creating tri-level latent electrostatic images comprising second CAD and DAD images at two different voltage levels, background areas at a third voltage level and a second virtual image at a voltage level which is substantially the same as said background areas;developing said second CAD images formed in said second pass with an ink different from said color inks used in said first pass of the charge retentive structure;developing said second DAD image formed in said second pass with another color ink different from all other color inks previously used;conditioning said second virtual image formed during said second pass to form a developable DAD image;developing said developable DAD image formed from the second virtual image formed during said second pass with an ink that is the same color as one of the inks used in said first pass; andconditioning said developed images for effecting transfer thereof to a final substrate.