Incremental printing of symbolic information – Ink jet – Controller
Patent
1993-09-07
1997-01-28
Reinhart, Mark J.
Incremental printing of symbolic information
Ink jet
Controller
347 57, 347 58, B41J 207
Patent
active
055981895
ABSTRACT:
A bipolar ink jet driver circuit includes a plurality of individual driver cells having a common collector and a resistive heater element. A common collector obviates the need for any isolation between adjacent driver cells. The driver cells each include two bipolar transistors configured as a Darlington pair, which drive an associated resistive heater element. The cells are grouped together to form individual driver circuits each having a control line for enabling each driver circuit. The cells within each driver circuit are individually addressable via address lines which are coupled to each of the driver elements. The resistive heater elements are actuated by enabling a driver circuit and addressing a driver cell within the enabled driver circuit.
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Bohorquez Jaime H.
Grace James W.
Hess Ulrich E.
Hulings James R.
Hewlett--Packard Company
Reinhart Mark J.
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