Incremental printing of symbolic information – Ink jet – Controller
Patent
1996-04-26
1998-05-26
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Controller
347 88, B41J 204
Patent
active
057573913
ABSTRACT:
In the high-frequency drop-on-demand ink jet system described in the specification, a variable impedance characteristic of an ink jet orifice is utilized to provide maximum drop ejection rates exceeding the maximum rates possible with constant orifice impedance characteristics. In one embodiment, successive negative, positive and negative pulses are applied to eject each drop in order to utilize a nonlinear orifice impedance characteristic, permitting maximum ink drop ejection rates exceeding 10-20 kHz and up to 150-200 kHz, and, in another embodiment, the ink jet orifice is designed with a bellmouth shape arranged to enhance the variable impedance characteristic.
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Peter A. Torpey, "Effect of Refill Dynamics on Frequency Response and Print Quality in a Drop-on-Demand Ink-Jet System", The Third International Congress on Advances in Non-Impact Printing Technologies, SPSE, Aug. 24-28, 1986, pp. 89-91.
Hartary Joseph W.
Spectra Inc.
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