Tri-level xerography for hypochromatic colorants

Details Tri-level xerography for hypochromatic colorants Tri-level xerography for hypochromatic colorants

2011-08-30

2011-08-30

Huff, Mark F (Department: 1721)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce color reproduction

C430S042100, C399S223000

Reexamination Certificate

active

08007969

ABSTRACT:
A xerogrpahic system and method use a tri-level development process in which at least one xerographic imaging unit includes a photoreceptor and a pair of developer units. A first developer unit includes a conventional first toner of a given color (CYMK) and a second developer unit includes a hypochromatic light form of the first toner. By use of a specific tri-level process, excellent color-to-color registration can be achieved for each processed color separation because overlap between colorants can be prevented. Moreover, by use of two forms of the same colorant, a smoother tone reproduction curve can be achieved when an aggressive blending strategy is used. Gamut loss and ink limit violation can be avoided by adjusting the blending curve in certain situations. An exemplary implementation uses a four drum, eight color tandem architecture with formulations of Cyan, Magenta, Yellow and Black, as well as corresponding hypochromatic light colorants of light Cyan, light Magenta, light Yellow, and light Black (gray).

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Co-pending U.S. Appl. No. 11/692,411 to Mashtare et al., filed Mar. 28, 2007.

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