Patent ID: 7008046

Claim:
A micro-electromechanical liquid ejection device that comprises a substrate that incorporates drive circuitry; nozzle chamber walls that are positioned on the substrate to define a nozzle chamber, the nozzle chamber walls including a roof wall that defines an ejection port in fluid communication with the nozzle chamber, the substrate defining an inlet passage through the substrate and into the nozzle chamber; an elongate drive member, the drive member being fast with the substrate at a fixed end and incorporating an electrical circuit that is in electrical contact with the drive circuitry to receive an electrical signal from the drive circuitry, the drive member being configured so that a free end of the drive member is displaced relative to the substrate on receipt of the electrical signal; a motion-transmitting member that is fast with the free end of the drive member so that the motion-transmitting member is displaced together with the free end; and an elongate liquid displacement member that is fast at one end with the motion-transmitting member and extends into the nozzle chamber to be displaced together with the motion-transmitting member to eject liquid from the ejection port.