Patent ID: 7777395

Claim:
A continuous drop emitter comprising: a liquid supply chamber containing a liquid held at a positive pressure; first and second nozzles in fluid communication with the liquid supply chamber emitting first and second continuous streams of a liquid; first and second stream break-up transducers adapted to independently synchronize the break up of the first and second continuous streams of the liquid into first and second streams of drops, respectively, at a same nominal drop frequency, f 0 , also generating sound waves in the liquid at the nominal drop frequency, f 0 ; a Helmholtz resonator tuned to a selected acoustic crosstalk frequency, f x , wherein (f 0 /10)≦f x ≦2f 0 and the Helmholtz resonator is comprised of a resonant volume chamber and at least one resonator coupling passageway in acoustic communication with the liquid supply chamber; and an acoustic damping material located within the Helmholtz resonator for damping sound waves generated within the liquid chamber by the first and second stream break-up transducers.