Perforated membranes for liquid control in acoustic ink...

B - Operations – Transporting – 41 – J

Patent

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234/38, 101/96.0

B41J 2/04 (2006.01) B41J 2/14 (2006.01) G01D 15/18 (2006.01)

Patent

CA 2014660

In accordance with the present invention, an acoustic ink printer comprises a pool of liquid ink having a free surface in intimate contact with the inner face of a perforated membrane. The printer addresses all pixel positions within its image field via substantially uniform, relatively large diameter apertures which extend through the membrane on centers that are aligned with respective ones of the pixel positions. In operation, one or more focused acoustic beams selectively eject individual droplets of ink from the ink menisci that extend across the apertures. Accordingly, the membrane is positioned and the bias pressure that is applied to the ink is selected so that the menisci essentially remain within the focal plane of such beam or beams.

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