Printer with printhead having moveable ejection port

摘要

A printer has an inkjet printhead formed on a wafer substrate. Formed in the wafer are a plurality of nozzle chambers for storing ink to be ejected. Each of the nozzle chambers has an outer wall defining an ink ejection port. In use, actuators cause the ink ejection port to move inward causing ink to be ejected through the nozzle. The actuators include a surface which bends inwards away from the centre of the nozzle chamber upon actuation and a thermal actuator device having a conductive resistive heating element encased within a material having a high coefficient of thermal expansion.