Patent ID: 7441875

Claim:
An inkjet printhead comprising a plurality of micro-electromechanical ink ejection nozzles, each nozzle comprising: a substrate incorporating drive circuitry; a nozzle chamber arranged on the substrate having a static nozzle section and an active nozzle section, the static nozzle section having static walls extending from the substrate and the active nozzle section having a roof wall defining an ink ejection port and an active wall depending from the roof wall about the static walls, the roof and active walls being displaceable relative to the static walls so as to change a volume of the nozzle chamber thereby causing ink in the nozzle chamber to be ejected from the ink ejection port; at least two actuators connected to the drive circuitry and operatively arranged with respect to the active nozzle section to displace the roof and active walls relative to the static walls on receipt of an actuating electrical signal from the drive circuitry; and a coupling structure interposed between each actuator and the active nozzle section, the coupling structures being configured and connected to the active nozzle section to impart substantially rectilinear movement to the roof and active walls on operation of the actuators.