H - Electricity – 04 – N
Patent
H - Electricity
04
N
101/96.0206
H04N 1/50 (2006.01) B41J 2/21 (2006.01)
Patent
CA 1138521
METHOD AND APPARATUS FOR DIGITALLY CONTROLLING THE FORMATION OF COLOUR IMAGES Abstract of the Disclosure The colour images are generated by the point-wise over- printing of the individual printing colours by means of an ink jet printer. During printing of the second and sub- sequent colours the record medium is illuminated with white light and monitored by a two-dimensional opto-electronic device carrying colour filters. The spectral components measured are transformed into electrical signals used in each colour channel to control droplet generation, ink pressure and droplet deflection for correction in the direction of movement of the record medium, and to control the print head transport mechanism for correction in the direction orthogonal to the said direction. The ink jet printer for performing this method com- prises at least three nozzles arranged in a common print head and a white-light source illuminating the image portions printed on the record medium. An opto-electronic scanner equipped with colour filters is mounted in scanning position. Its outputs are connected via a control unit to the control inputs of the droplet generators, of the ink supply and the deflection electronic of each individual colour channel as well as with the control inputs of the print head transport mechanism. SZ978005
337706
International Business Machines Corporation
Rosen Arnold
LandOfFree
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