Patent ID: 6910761

Claim:
An ink jet recording head for ejecting ink droplets to print an image, the print head comprising: a substrate; an insulating film layer disposed on the substrate; a plurality of partition walls for defining a plurality of bubbled-ink forming portions, the partition walls being disposed on the insulating film layer along a predetermined, first direction with a predetermined distance between them; a plurality of heater resistor portions disposed on the insulating film layer within the respective bubbled-ink forming portions, each heater resistor portion being formed by a bubbled-ink forming area for heating and vaporizing ink and by extended portions which are connected to opposite ends, in the first direction, of the bubbled-ink forming area; a surface of each heater resistor portion having an oxidation film which is formed by being thermally oxidized and which serves as an ink protection layer; and a plurality of pairs of electrodes, each pair of the electrodes being connected to a corresponding heater resistor portion, one electrode of each pair being a first electrode and being disposed at a lower surface side of the insulating film layer, the other electrode of each pair being a second electrode and being disposed on the heater resistor portion, wherein an upper surface of the insulating film layer is entirely covered with the partition walls and the heater resistor portions such that the upper surface of the insulating film layer is not in direct contact with ink.