Stabilization of the free surface of a liquid

Details Stabilization of the free surface of a liquid Stabilization of the free surface of a liquid

1992-05-29

1997-05-13

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Controller

347 46, B41J 204

Patent

active

056297246

ABSTRACT:
Techniques for obtaining an ejection rate independent, spatial relationship between an acoustic focal area and the free surface of a liquid. Variations in the spatial relationship are reduced or eliminated by applying substantially the same acoustic energy to the liquid's free surface during periods when droplets are not ejected as when they are, but at power levels insufficient to eject a droplet. During ejection periods in which a droplet is not ejected, the acoustic energy is applied at a lower level, but for a longer time. Because it is more convenient to measure and control, the transducer drive voltage is used to control the acoustic energy applied to the liquid's free surface.

REFERENCES:
patent: 4266232 (1981-05-01), Juliana et al.
patent: 5107276 (1992-04-01), Kneezel et al.
patent: 5122818 (1992-06-01), Elrod et al.
patent: 5172134 (1992-12-01), Kishida et al.

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