Patent ID: 7677703

Claim:
A pagewidth printhead comprising: a printhead controller; a wafer substrate that defines a plurality of inlets; and a plurality of micro-electromechanical nozzle arrangements on the wafer substrate and under control of the controller, each nozzle arrangement comprising: side walls located on the wafer substrate with a roof portion attached to said walls to define a printing fluid chamber in fluid communication with one inlet, the roof portion defining an ejection port; and a plurality of heater elements suspended between the side walls in the fluid chamber, so that when electrical actuation energy is applied to respective heater elements a vapour bubble is formed in the fluid leading to a pressure increase in the chamber thereby ejecting the fluid via the ejection port, wherein the controller is configured to actuate respective heater elements individually to facilitate ejection of weighted ink drop volumes from the nozzle arrangement, and a mass of the heater element is less than 2 nanograms.