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Pulse Cancellation in Drop-On-Demand

IP.com Disclosure Number: IPCOM000044109D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Drago, GA: AUTHOR [+3]

Abstract

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.

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Pulse Cancellation in Drop-On-Demand

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. When the reflected pulse 14 reaches the pulse-generating region, a second contraction is used to generate its exact replica but of opposite sign. This results in a cancellation of the reflected forward-travelling pulse 14. Pulse 16 which initially travelled in the forward direction is reflected at the nozzle 18, travels to the rear, and is reflected at the reservoir. When reflected pulse 20 enters the pulse-generating region after this second reflection, it is similarly cancelled. Each cancellation of a forward-travelling pulse will also create a rearward pulse which, after reflection at the reservoir, will become forward travelling and have to be cancelled. Since propagation and reflection are lossy processes, the cancelling pulses di...