Multi-drop ink-jet recording method with compensation for image density non-uniformities
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
Jun 3, 1992
filing date -
Jun 7, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
After an ink-jet recording head with a plurality of discharging portions arranged is main-scanned in a direction perpendicular to the direction of the discharging portion arrangement to record a first image area, sub-scanning of the head is performed. Before the head is main-scanned to record a second image area, the sub-scanning is performed so that a few discharging portions on an upper edge portion of the head in second main-scanning overlap part of the first image area. Ink droplets land on pixels in the overlapping portion twice for each main-scanning, and image density of the pixels in the overlapping portion is controlled by the sum number of the landing ink droplets. This enables image density unevenness of image density, example, a 'black stripe (banding)' or a 'white stripe (banding)' in a boundary of an image area being recorded in each main-scanning, to be markedly reduced.
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