Incremental printing of symbolic information – Ink jet – Controller
Patent
1993-05-10
1996-05-28
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
347 69, B41J 2045
Patent
active
055216188
ABSTRACT:
A digital driver for an ink jet printhead and an associated method for selectively applying voltage to a piezoelectric sidewall actuator of the ink jet printhead. The digital driver includes positive and negative voltage sources, a first switching element having a first control input, a first voltage supply input connected to the positive voltage source, and a first output, and a second switching element having a second control input, a second voltage supply input connected to the negative voltage source, and a second output connected to the first output to provide a single output connected to the piezoelectric sidewall actuator. By asserting the first control input for a first time period, the first switching element generates a positive voltage pulse at the single output to displace the sidewall actuator from a rest position to a first position. Next, by simultaneously deasserting the first control input and asserting the second control input, the second switching element generates a negative voltage pulse at the single output to displace the sidewall actuator from the first position, past the rest position, to a second position. Next, by deasserting the second control input, the sidewall actuator passively returns to the rest position. The return to the rest position may be assisted by discharging the printhead after deassertion of the second control input, by re-applying the first voltage for a second, shorter, time period to actively drive the sidewall actuator towards the rest position, or by both.
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Wallace, David B., entitled "A Method of Characteristic Model of a Drop-on-Demand Ink-Jet Device Using an Integral Method Drop Formation Model", 89-WA/FE-4 (1989).
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Stortz James L.
Wallace David B.
Bobb Alrick
Compaq Computer Corporation
Fuller Benjamin R.
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