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A multi nozzle ink jet drop-on-demand (DOD) printer is described in which cross-talk between ink channels is minimized by means of a membrane mounted in the print head ink manifold.
English (United States)
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Method to Reduce Cross-talk And to Enhance Shock Resistance of Drop-
on-demand Ink Jet Array
A multi nozzle ink jet drop-on-demand (DOD) printer is described in which
cross-talk between ink channels is minimized by means of a membrane mounted
in the print head ink manifold.
The print head comprises a drive section 1 which includes a plurality of
electromechanical transducers, such as piezoelectric tubes 2, for example. Ink is
supplied through inlet 3 to ink manifold 4 and through an orifice 5 to each of the
piezoelectric transducers 2. A flexible membrane 6 is fixed in position in the ink
manifold 4 and separated from one of the walls 7 of the manifold by an air pocket 8.
The membrane 6 functions as a large RC filter for acoustic waves with very
loose requirements on the resistive element. The membrane eliminates acoustic
resonance in the head manifold 4, and it smooths out large pressure fluctuation
in the head manifold due to pressure-flow relationship during asynchro operation
of the DOD print head. The membrane also provides shock resistance for the
DOD array since it de-couples the print head from vibrations transmitted from the