Patent ID: 7954238

Claim:
A method of fabricating an ink jet head circuit board, said ink jet head circuit board having heaters to generate thermal energy for ejecting ink as they are energized, the method comprising the steps of: forming an SiC layer on a substrate; forming on the SiC layer first electrodes having a gap therebetween in which to form the heater, said first electrodes being formed of a corrosion resistant metal selected from Ta, Pt and an alloy containing at least one of them; forming a resistor layer on the first electrodes including the gap; forming on the first electrodes and the resistor layer a layer for second electrodes; and then removing from the layer for second electrodes a gap portion larger than the gap of the first electrodes to form second electrodes, the second electrodes having a greater thickness than that of the first electrodes, wherein the resistor layer is split over the first electrodes.