Method and device for printing grey scale images at high...

Incremental printing of symbolic information – Ink jet – Ejector mechanism

Reexamination Certificate

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C347S015000, C358S001900

Reexamination Certificate

active

07152946

ABSTRACT:
The present invention relates to ink jet printing, and more particularly to a method of printing and an apparatus for providing images having grey levels of varying intensity.The present invention provides a method and device for printing grey scale images on a printing medium. The method includes delivering at least a number of first droplets of printing material of a color with a first volume from a first printhead and a number of second droplets of printing material of that color with a second volume from a second printhead, the first volume and the second volume being different, and merging together the number of first droplets and the number of second droplets on a target pixel position on the printing medium to obtain a given greyscale dot on the printing medium.

REFERENCES:
patent: 4714935 (1987-12-01), Yamamoto et al.
patent: 5581284 (1996-12-01), Hermanson
patent: 5587730 (1996-12-01), Karz
patent: 6375294 (2002-04-01), Kneezel
patent: 2002/0105557 (2002-08-01), Teshigawara et al.
patent: 2004/0223014 (2004-11-01), Barr et al.
patent: 0 902 587 (1999-03-01), None
patent: 0 914 954 (1999-05-01), None
patent: 1 228 878 (2002-08-01), None
patent: 03 10 0424 (2003-07-01), None

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