Pulse Cancellation in Drop-On-Demand
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Reflected pulses which reverberate through the fluid channels of a drop-on-demand printhead degrade the performance of the printhead. Undesirable reflected pulses can be cancelled by generating an equal and opposite pulse when each reflected pulse enters the pulse-generating region of the printhead. The figure shows schematically a single channel of an impulse, drop-on-demand printhead. A contraction 8 in the pulse-generating region 10 produces a pair of pulses, one of which travels forward towards the nozzle to produce a drop, and the other of which travels rearward towards the reservoir. The rearward-travelling pulse 12 is reflected at the reservoir and becomes a forward-travelling pulse 14.