Bidirectional color printing using multipass printmodes with at

Details Bidirectional color printing using multipass printmodes with at Bidirectional color printing using multipass printmodes with at

1997-03-04

2000-11-07

Le, N.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 41, 347 12, B41J 221, B41J 2145, B41J 215, B41J 2938

Patent

active

061426059

ABSTRACT:
The method enables swath-type bidirectional printing without hue shift, using plural scanning multiple-inkjet printheads (holding inks of different colors respectively) and printing-medium advance orthogonal to the scan axis. Inking is calculated and implemented for each position in the grid independently. Images appear as a pixel grid of columns and rows both spaced--i.e. in both the scan and media-advance directions--more finely than 300 dpi. In one aspect of the invention, both these resolutions are the same, and equal to the nozzle spacing. At least some of the nozzles are overlapping and respectively aligned along the advance axis, to be capable of printing on adjacent rows during a single pass. In another aspect of the invention, the nozzle arrays only partially overlap, so as to use significantly fewer than the total number of nozzles in each array. As to this second aspect of the invention, in each nozzle array the method uses a number of nozzles that is fewer than the total nozzle complement by a certain number that is preferably at least fifteen, more preferably thirty, and ideally roughly sixty nozzles.

REFERENCES:
patent: 4593295 (1986-06-01), Matsufuji et al.
patent: 4677448 (1987-06-01), Mizusawa et al.
patent: 4965593 (1990-10-01), Hickman
patent: 5208605 (1993-05-01), Drake
patent: 5600351 (1997-02-01), Holstun et al.
patent: 5777640 (1998-07-01), Shioya et al.
patent: 5870117 (1999-02-01), Moore

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