Patent ID: RE40529

Claim:
A process for producing a substrate for an ink jet recording head comprising a plurality of discharge openings for discharging a liquid and a plurality of liquid passageways each communicating with one of the plurality of discharge openings, the process comprising the steps of: forming in a predetermined pattern on a base plate a plurality of heat generating resistance members arranged generally along a line and a plurality of pairs of electrodes each connected to one of the plurality of heat generating resistance members, wherein each said pair of electrodes and each corresponding heat generating resistance member integrally form a U-shaped wiring member with a bent portion arranged with all of said bent portions facing in the same direction; and cutting the base plate along a line substantially parallel to said line along which the plurality of heat generating resistance members are arranged at a location remote by a predetermined distance from each of the plurality of heat generating resistance members to form the substrate, the location for cutting determining a relative location between the plurality of heat generating resistance members and the plurality of discharge openings of the ink jet recording head to be produced using the substrate.