Patent ID: 7891764

Claim:
A printhead assembly for a printer system, the printhead assembly comprising: an elongate substrate defining a channel and spaced apart sets of ink supply holes; an ink distribution arrangement located within the channel and configured to distribute ink to the sets of ink supply holes; a first plate in engagement with the substrate to hold the ink distribution arrangement within the channel; a power supply arrangement located within the channel; a second plate in engagement with the substrate so that the power supply arrangement is sandwiched between the plates and held within the channel; and printhead modules are mounted serially along the substrate outside the channel with each printhead module including an ink ejection integrated circuit in fluid communication with a respective set of ink supply holes, each of the ink ejection integrated circuits having a plurality of inkjet nozzles, each nozzle comprising a heater element bonded to a roof of an ink chamber about an inkjet port via a low thermal product layer on the roof such that one surface of the heater element is bonded to the low thermal product layer and all other surfaces of the heater element are in contact with the ink within the ink chamber.