Patent ID: 8328336

Claim:
An inkjet printhead integrated circuit comprising: a wafer substrate defining an ink passage; a nozzle plate supported on said substrate by side walls to define an ink chamber operatively supplied with ink via said ink passage, the nozzle plate defining an ink ejection port corresponding to the ink chamber; and a heater element bonded to the nozzle plate inside the chamber for vaporising ink to generate a vapour bubble that ejects ink through the ejection port, the heater element being bonded to the nozzle plate with a low thermal product layer; wherein, the low thermal product layer has a thermal product less than 1495 Jm −2 K −1 s −1/2 , the thermal product being (ρCk) 1/2 , where ρ is the density of the layer, C is specific heat of the layer and k is thermal conductivity of the layer.