Tri-level tandem xerographic architecture using reduced...

Details Tri-level tandem xerographic architecture using reduced... Tri-level tandem xerographic architecture using reduced...

2007-03-28

2010-06-08

Royer, William J (Department: 2852)

Electrophotography

Image formation

Development

C399S298000, C399S299000, C399S302000

Reexamination Certificate

active

07734225

ABSTRACT:
A xerographic 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 full strength toner of a given color and a second developer unit includes a reduced strength toner of the same or substantially the same color. By use of the tri-level process, excellent color-to-color registration can be achieved for each processed color separation. Moreover, by use of two strengths of the same colorant, a tighter control of a tone reproduction curve can be achieved. Additional xerographic imaging units can include a developer unit that provides spot color, custom color or specialty color capabilities. Additional benefits and gamut expansion can be achieved through use of a tandem architecture. A preferred implementation uses a four drum, eight color tandem architecture with full strength and reduced strength toners formulations of Cyan, Magenta, Yellow, and Black (CYMK) colorant.

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