Swath density control to improve print quality and extend printh

Details Swath density control to improve print quality and extend printh Swath density control to improve print quality and extend printh

1997-12-22

2000-11-14

Nguyen, Thinh

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 14, 347 17, 347 19, B41J 2145, B41J 2938, B41J 29393, B41J 215

Patent

active

061459593

ABSTRACT:
An inkjet printer uses a printhead that passes repeatedly across a print medium in individual swaths. The printhead has individual nozzles that are fired repeatedly during each printhead swath to apply an ink pattern to the print medium. Before any given swath, the printer analyzes factors that might require a reduction in print density. Anticipated printhead temperature is one factor that might require a reduction in print density. The printer monitors the print density and peak printhead temperature during each printhead swath. It then uses these values to calculate, prior to each new swath, a maximum permissible print density. If a reduction in print density is required, the printer temporarily disables selected nozzles to produce a reduced-height swath rather than pausing between swaths or reducing the printhead velocity relative to the page.

REFERENCES:
patent: 4855752 (1989-08-01), Bergstedt
patent: 5477245 (1995-12-01), Fuse
patent: 5489926 (1996-02-01), Arbeiter
patent: 5608439 (1997-03-01), Arbeiter et al.
patent: 5617122 (1997-04-01), Numata, et al.
patent: 5644683 (1997-07-01), Ross et al.
patent: 5760798 (1998-06-01), Suzuki et al.
European Search Report Dated Nov. 12, 1999 for related European Patent Application 98310377.1-2304 Filed Dec. 17, 1998.

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