A firing circuit for a thermal inkjet-printing nozzle includes a heater resistor and a switch. The heater resistor heats ink to cause the ink to be ejected from the nozzle. The heater resistor has a first end and a second end, the second end connected to a ground. The switch controls activation of the heater resistor. The switch has a first end connected to a voltage source and a second end connected to the first end of the heater resistor. The switch operates in a constant current mode, such that an at least substantially constant current flows through the heater resistor upon activation.
申请公布号
EP1881900(B1)
申请公布日期
2008.10.15
申请号
EP20060752367
申请日期
2006.05.08
申请人
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
发明人
LIAO, HANG;YEH, BAO-SUNG BRUCE;KAWAMOTO, GALEN H.;SCHLOEMAN, DENNIS J.;CLARK, RICHARD R.