Capillary wave controllers for nozzleless droplet ejectors

Details Capillary wave controllers for nozzleless droplet ejectors Capillary wave controllers for nozzleless droplet ejectors

1987-06-25

1988-05-31

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

310334, G01D 1516

Patent

active

047484616

ABSTRACT:
A nozzleless droplet ejector for ejecting droplets from a free surface of a pool of liquid, such as a pool of ink, comprises a selectively energizeable emission controller for generating a freely propagating capillary wave on the surface of the pool to provide on/off timing control and/or ejection trajectory angle control for the ejector. The controller comprises a conductor and a counter electrode. The conductor is immersed in the pool, whereby a capillary surface wave is generated when a voltage is applied across the conductor and the counter electrode. In one embodiment, a focused ultrasonic acoustic wave or the like perturbs the pressure acting on the free surface of the pool, and the capillary wave supplied by the controller coherently interacts with that pressure perturbence to provide the desired control.
Separate controllers may be provided for independently controlling the ejectors of multiple ejector arrays. The functionality of these emission controllers is dependent on the geometry of their conductors, so a few exemplary geometries are disclosed with the understanding that there are others which may be used.

REFERENCES:
patent: 3211088 (1965-10-01), Naiman
patent: 4308547 (1981-12-01), Lovelady et al.
patent: 4383265 (1983-05-01), Kohashi
patent: 4697195 (1987-09-01), Quate

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