Patent ID: 6357863
Filing Date: 2002-03-19
Classification: B41J

Abstract:
An ink jet print head used in an ink jet printing apparatus, the print head comprising:a nozzle plate having a substantially linear array of ink jet nozzles through which ink droplets are ejected toward a print medium; and an integrated circuit chip disposed adjacent the nozzle plate, the chip having a length and a width, comprising: a semiconductor substrate; a source voltage conductor disposed on the substrate and connected to a source voltage; a ground return conductor disposed on the substrate; a plurality of ink heating resistors disposed on the semiconductor substrate in a substantially linear arrangement which is substantially parallel to the length of the chip, each of the ink heating resistors being associated with a corresponding one of the ink jet nozzles; and a plurality of substrate heater resistors distributed across the semiconductor substrate in a substantially linear arrangement of three or more substrate heater resistors which is substantially parallel with the ink heating resistors, the substrate heater resistors being electrically connected in parallel, with one node of each of the substrate heater resistors being connected to the source voltage conductor and another node of each of the substrate heater resistors being connected to the ground return conductor.