Patent ID: 7661793

Claim:
An inkjet drop ejection apparatus comprising: an array of ink ejection nozzles formed on a front surface of a wafer substrate, each nozzle having a chamber with an actuator for ejecting drops of ink through the nozzle, and an ink inlet in fluid communication with the ejection nozzle, the actuator having an ink engaging surface, a movable structure and a heater, the movable structure connected to the wafer substrate and the ink engaging surface, the heater being positioned to heat one part of the movable structure more than another part thereby moving the movable structure by differential thermal expansion and consequently displace the ink engaging surface within the chamber; and a plurality elongate ink feed channels connected to each of the ink inlets respectively; wherein, said actuator is a bend actuator cantilevered into the chamber from a fixed end, wherein a region closest to the fixed end flexes more readily than the remainder of said actuator.