Patent ID: 7278712

Claim:
A nozzle arrangement for an inkjet printhead, the nozzle arrangement comprising: a wafer substrate assembly defining an ink inlet channel and a first wall surrounding the ink inlet channel; a thermal actuator comprising an anchor extending from the wafer substrate assembly outside of the confines of the first wall, and thermal actuator arms extending from the anchor; and a roof structure operatively mounted to terminate the actuator arms and which covers the first wall, the roof structure defining a second wall surrounding the first wall so that the wafer substrate assembly and the roof structure together define a nozzle chamber in which ink from the ink inlet channel can be supplied, the roof structure further defining a rim through which ink in the nozzle chamber can be ejected so that, upon thermal actuation of the actuator, the actuator moves the roof structure with respect to the wafer substrate assembly to eject ink in the nozzle chamber through the rim.