Patent ID: 6158845
Filing Date: 2000-12-12
Classification: B41J

Abstract:
A print head for an ink jet printer of the type wherein ink forms a meniscus above a nozzle bore and spreads along an upper surface of the print head; said print head comprising:a substrate having an upper surface;an ink delivery channel below the substrate;a nozzle bore through the substrate and opening below the substrate into the ink delivery channel to establish an ink flow path;a source of pressurized ink communicating with the ink delivery channel such that ink tends to form a meniscus on the upper surface of the heater; anda resistive heater about at least a portion of the nozzle bore, said heater having an upper surface which is coplanar with a surrounding portion of the upper surface of the substrate, whereby the print head is flat in regions along an ink-to-solid contact line of the meniscus.