Method of operating pulsed droplet deposition apparatus

Details Method of operating pulsed droplet deposition apparatus Method of operating pulsed droplet deposition apparatus

B - Operations, Transporting

41

J

101/96.0208

B41J 2/115 (2006.01) B41J 2/045 (2006.01)

Patent

CA 2004891

ABSTRACT Method of Operating Pulsed Droplet Deposition Apparatus. A method of operating a pulsed droplet deposition apparatus for ejecting a liquid droplet from a nozzle supplied by a liquid retaining chamber comprises applying a first pulse to the liquid in the chamber of sufficient energy to effect ejection of a droplet from the nozzle and thereafter applying a second pulse to the liquid in the chamber to ensure that the meniscus of the body of liquid to which the droplet is attached is convex in the direction of motion of the droplet at the time of detachment of the droplet. The energy content of the second pulse is insufficient of itself to effect droplet ejection. When employed in a multi-channel array printhead, the pulses applied to channels of the array selected for printing are produced e.g. by deflecting side walls of the selected channels or by applying heating pulses to liquid in the selected channels.

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