Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1995-01-12
1996-12-03
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 47, 347 15, B41J 2045, B41J 2205
Patent
active
055812864
ABSTRACT:
A spot size modulatable, drop-on-demand type ink jet printhead and associated methods for ejecting volume modulatable droplets of ink therefrom. The ink jet printhead includes a main body portion having first and second ink carrying channels longitudinally extending therethrough and a cover plate fixedly mounted thereto. Formed in the cover plate is a tapered orifice which extends from first and second openings along a back side surface to a third opening along a front side surface thereof. The cover plate is mounted to the main body portion such that the first opening is in communication with the first ink carrying channel and the second opening is in communication with the second ink carrying channel. The ink jet printhead further includes first and second actuators coupled with the first and second ink carrying channels, respectively. Volume modulatable droplets of ink may be ejected from the ink jet printhead by simultaneously applying a voltage pulse having a selected magnitude to the first ink carrying channel and a voltage pulse having a magnitude ranging between zero and the selected magnitude to the second ink carrying channel. Alternately, volume modulatable droplets of ink may be ejected from the ink jet printhead by sequentially applying a voltage pulse having a selected time duration to the first ink carrying channel and a voltage pulse having a time duration ranging between zero and the selected time duration to the second ink carrying channel.
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Hayes Donald J.
Wallace David B.
Compaq Computer Corporation
Hartary Joseph W.
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