| 摘要 |
An ink jet printing apparatus (10) is provided comprising a print cartridge (20,30) including at least one resistive heating element (52,62) in at least one ink-containing chamber (55,65) having an orifice (56a,66a). The apparatus further includes a driver circuit (70), electrically coupled to the print cartridge, for applying to the resistive heating element (52,62) warming pulses (P 1 ) and firing pulses (P 2 ) separated by a delay period (t 2 ). The warming pulse (P 1 ) causes the resistive heating element (52,62) to warm a portion of the ink adjacent to the heating element and the firing pulse (P 2 ) causes the resistive heating element (52,62) to produce a vapor bubble in the chamber which causes a droplet of ink to be ejected from the chamber orifice (56a,66a). |
