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AUTOMATED CONTROL OF IMAGE DENSITY IN AN IONOGRAPHIC GRAY LEVEL COLOR PRINTER

IP.com Disclosure Number: IPCOM000026309D
Original Publication Date: 1991-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 55K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for automatic control of image density in an ionographic gray level color printer is disclosed. When operating conditions of a color ionographic printing system are changed, print quality and color fidelity may be altered. For example, changes in the charge-to-mass ratio of colorant particles, use of different paper from initial calibration paper, and environmental changes may affect the total ion delivery from an ionographic printhead.

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XEROX DISCLOSURE JOURNAL

AUTOMATED CONTROL OF IMAGE DENSITY IN AN IONOGRAPHIC GRAY LEVEL COLOR PRINTER Harold M. Anderson
Gerald A. Domato
Joannes N.M. de Jong

Proposed Classification
U.S. C1. 346/159 Int. C1. GOlD 15/06

A method for automatic control of image density in an ionographic gray level color printer is disclosed. When operating conditions of a color ionographic printing system are changed, print quality and color fidelity may be altered. For example, changes in the charge-to-mass ratio of colorant particles, use of different paper from initial calibration paper, and environmental changes may affect the total ion delivery from an ionographic printhead.

A method for automative control of the image density comprises the steps of: periodically printing a test patch for each colorant at a high and low density; comparing the test patch image densities with reference values obtained from previously calibrated test patches; adjusting the image density of subsequently printed test patch by, for example, changing the speed of the air pump for a particular ionographic head or by altering the development bias for a particular toning station until the reference image density of the test patch is accomplished.

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 2 MarcWApril1991 99

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100 XEROX DISCLOSURE JOURNAL - Vol. 16, No. 2 March/April1991

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