Coincidence gate ink jet with increased operating pressure windo

Details Coincidence gate ink jet with increased operating pressure windo Coincidence gate ink jet with increased operating pressure windo

1978-12-04

1980-04-22

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

041997700

ABSTRACT:
In a coincidence vector gate ink jet, a droplet is expressed from an outlet orifice by a coincident pressure produced by a pair of transducers at an outlet orifice. In this type of ink jet, it is normal for one of a cooperating pair of transducers to be activated in a non-coincident mode. In the non-coincident mode, a droplet is not expressed from an outlet orifice as long as the pressure produced by the one transducer remains below a given threshold. A certain type of pressure absorbing chamber is provided for a specific coincident gate ink jet array, which permits this threshold pressure to be substantially increased to a level substantially above the minimum coincident pressure produced by the pair of transducers to express a droplet from the orifice. This increase in the threshold pressure is an increase in the operating window. A greater operating window permits greater latitudes in manufacturing variation and permits greater latitudes in pressure variation to change the size of a droplet to effect halftoning.

REFERENCES:
patent: 3373436 (1968-03-01), Auphan
patent: 3493004 (1970-02-01), Hellbaum
patent: 3747120 (1973-07-01), Stemme
patent: 3848118 (1974-11-01), Rittberg
patent: 3848258 (1974-11-01), Mahoney
patent: 3930260 (1975-12-01), Sicking
patent: 4104645 (1978-08-01), Fiscabeck

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