Patent ID: 6899415

Claim:
An ink jet nozzle arrangement comprising: nozzle chamber which includes a wall defining an ink ejection port; and a plurality of micro-electromechanical actuators that are connected to electronic drive circuitry and operatively arranged relative to said port, each actuator being configured so that, on receipt of an electrical signal from the drive circuitry, at least part of the actuators are displaced relative to said port causing ejection of ink from said nozzle chamber through said ink ejection port; wherein each actuator comprises an actuating member of a material that expands when heated; and a heating circuit that is connected to the electronic drive circuitry and arranged with respect to the actuating member so that when the heating circuit receives said electrical signal from the electronic drive circuitry, the actuating member is subjected to differential expansion which results in movement of the actuating member and thus part of the actuator.