Method of multi-tone printing

Details Method of multi-tone printing Method of multi-tone printing

B - Operations, Transporting

41

J

101/96.0209

B41J 2/205 (2006.01) B41J 2/06 (2006.01) B41J 2/14 (2006.01) B41J 2/21 (2006.01) H04N 1/40 (2006.01)

Patent

CA 2027161

A method of multi-tone printing employs a drop-on-demand printing apparatus for depositing ink droplets on printing element areas of a medium which is movable relatively to said apparatus. The droplets are deposited from an array of channels on a medium which is movable relatively to the channels. The channels length and nozzle location and dimensions afford each channel with a high longitudinal resonant frequency and electrically actuable means supply energy pulses to selected channels at or near the resonant frequency of the channels to deposit from each selected channel in the corresponding printing element area of the medium a number of drops equal to the number of pulses applied thereto, the number of pulses applied being dependent on the tone of printing required. Single channel and colour versions of the invention are also disclosed.

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