Patent ID: 7134187

Claim:
A method of making an inkjet-head chip structure from a substrate formed with at least a transistor and an actuator, the method comprising the steps of: forming a thermal resisting layer on the substrate, the thermal resisting layer generating actuating energy from an electrical current/voltage provided by the transistor to push out ink droplets; forming a first conductive layer whose sheet resistance is smaller than the thermal resisting layer, the first conductive layer and the thermal resisting layer being attached to each other and in an electrical contact; forming an interlayer insulator covering the substrate surface, the thickness of the interlayer insulator being smaller than the sum of the first conductive layer and the thermal resisting layer; defining a sacrifice layer on the surface of the interlayer insulator, exposing only the area of the interlayer insulator for forming a passivation layer; depositing the passivation layer and removing the photoresist or sacrifice layer; and forming a second conductive layer on the interlayer insulator, the material of the second conductive layer being different from that of the passivation layer.