Spot deposition for liquid ink printing
AssigneeXerox Corporation
InventorsLarry W. Lin, Stuart L. Claassen, Chein-Hwa Tsao
Life of this patent
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Abstract
A method of depositing spots of liquid ink upon selected pixel centers on a substrate having poor ink absorptive properties so as to prevent the flow of liquid ink from one spot to an overlapping adjacent one. The line of information is printed in at least two passes so as to deposit spots of liquid ink on selected pixel centers in a checkerboard pattern wherein only diagonally adjacent pixel areas are deposited in the same pass. On the second pass the complementary checkerboard pattern is deposited. Ink is not deposited on horizontally or vertically adjacent pixel areas during the single pass since the spots on these adjacent areas have overlapping portions.
Claims8
A method for improving graphic image formation generated by a liquid ink spot printing system so as to prevent non-uniform printing caused by ink beading, said method being characterized by depositing spots of liquid ink on selected abutting horizontal and vertical pixel areas on a substrate and comprising the steps of
- providing a substrate,
- providing liquid ink spot producing means adjacent said substate capable of simultaneously depositing a number of spots onto said substrate on command, selectively energizing said liquid ink spot producing means for producing droplets of liquid ink and for propelling said droplets to said substrate where they form liquid ink spots, for depositing a first pattern of ink spots on an area of said substrate, including first spots located upon alternating horizontal and vertical pixel areas, each of said first spots being of a size so that diagonally adjacent ones are substantially in perimeter contact, and for depositing a second pattern of ink spots on said area of said substrate, including second spots located upon alternating horizontal and vertical pixel area, each of said second spots being of a size so that diagonally adjacent ones are substantially in perimeter contact, said second pattern being complementary to said first pattern.
Dependencies are inferred from the claim text.