Method and apparatus for ejecting a droplet using an electric fi

Details Method and apparatus for ejecting a droplet using an electric fi Method and apparatus for ejecting a droplet using an electric fi

1991-12-17

1996-07-30

Wong, Peter S.

Incremental printing of symbolic information

Ink jet

Controller

347 46, B41J 2938, B41J 2135

Patent

active

055416276

ABSTRACT:
A method and apparatus for ejecting droplets from the crests of capillary waves riding on the free surface of a liquid by parametrically pumping the capillary waves with electric fields from probes located near the crests. Crest stabilizers are beneficially used to fix the spatial locations of the capillary wave crests near the probes. The probes are beneficially switchably connected to an AC voltage supply having an output that is synchronized with the crest motion. When the AC voltage is applied to the probes, the resulting electric field adds sufficient energy to the system so that the surface tension of the liquid is overcome and a droplet is ejected. The AC voltage is synchronized such that the droplet is ejected about when the electric field is near is minimum value. A plurality of droplet ejectors are arranged and the AC voltage is switchably applied so that ejected droplets form a predetermined image on a recording surface.

REFERENCES:
patent: 4383265 (1983-05-01), Kohashi
patent: 4717926 (1988-01-01), Hotomi
patent: 4719476 (1988-01-01), Elrod et al.
patent: 4719480 (1988-01-01), Elrod et al.
W. Eisenmenger entitled "Dynamic Properties of the Surface Tension of Water and Aqueous Solutions of Surface Active Agents with Standing Capillary Waves in the Frequency Range From 10 kc/s to 1.5 Mc/s," pp. 327-340 of vol. 9, of Acustica, 1959.

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