Patent ID: 7824016

Claim:
A pagewidth printhead arrangement for an inkjet printer, the arrangement comprising a print engine controller; a wafer substrate defining a plurality of ink inlets; and a plurality of nozzles arranged on the substrate, each nozzle comprising: side walls located on the wafer substrate; a roof portion attached to said walls such that the side walls and roof portion define an ink chamber in fluid communication with a respective ink inlet, the roof portion defining an ejection port in fluid communication with the ink chamber; and a heater element suspended between the side walls in the ink chamber, so that when electrical actuation energy is applied to the heater element a vapour bubble is formed in the ink leading to a pressure increase in the chamber thereby ejecting the fluid via the ejection port, the print engine controller being configured to actuate the heater elements to facilitate a weighted ink drop volume to be ejected from the ejection port.