Printing uniformity using narrow printhead segments in digital p

Details Printing uniformity using narrow printhead segments in digital p Printing uniformity using narrow printhead segments in digital p

1996-03-14

1998-06-16

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347234, B41J 2145, B41J 215, B41J 247, B41J 2435

Patent

active

057678740

ABSTRACT:
A recording method for a printer having a printhead formed of an array of narrow segments that are distributed across the printhead so that there is a boundary between adjacent segments includes (i) applying a first two-dimensional modulation function to one of the segments to produce a first band of pixels on a recording medium, the first modulation function gradually decreasing from ONE to ZERO toward the boundary between said one segment and the adjacent segment; and (ii) applying a second two-dimensional modulation function to the adjacent segment to produce a second band of pixels on the recording medium adjacent the end of the first band, the second modulation function gradually decreasing from ONE to ZERO toward the boundary such that the total modulation function applied to the media is the sum of the modulation functions of the first and second bands. Preferably, the modulation functions applied to adjacent segments are of mirror symmetry. Each modulation function decreases from ONE to ZERO over a range of more than one pixel; about twelve pixels being preferred. The printhead is as wide as a full print line across the media, and the segments are staggered across the printhead.

REFERENCES:
patent: 4999646 (1991-03-01), Trask

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