Use of a densitometer for adaptive control of printhead-to-media

Details Use of a densitometer for adaptive control of printhead-to-media Use of a densitometer for adaptive control of printhead-to-media

1993-10-29

1995-05-09

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 19, B41J 209

Patent

active

054144531

ABSTRACT:
In order to optimize print quality, it is desirable to minimize the distance between a inkjet printhead and the media that is being printed on. Color inkjet printers commonly employ a plurality of print cartridges, usually either two or four, mounted in the printer carriage to produce a full spectrum of colors. In a multiple printhead printer, it is advantageous if the black print cartridge is closer to the print media when printing text than is the color cartridge when printing color graphics. Accordingly, a pen pen carriage with adjustable printhead-to-media spacing is disclosed. A controller tells the printer to decrease the printhead-to-media spacing when text printing is being performed and to increase the printhead-to-media spacing to the appropriate printhead-to-media distance when printing color graphics or large black area fills based on the density of ink being deposited. Thus, the controller constantly monitors what the pens will be doing to determine when the pens need to be moved closer to, or farther from, the paper. The apparatus and method enables the black printhead in a multiple cartridge color inkjet printer to be as close to the media as possible so that black text print quality will be optimized.

REFERENCES:
patent: 5065169 (1991-11-01), Vincent et al.
patent: 5187497 (1993-02-01), Hirano et al.
patent: 5227809 (1993-07-01), Carpenter et al.

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