| 摘要 |
A nozzle arrangement for an inkjet printhead includes a wafer substrate that defines an inlet channel and incorporates CMOS layers to generate electrical drive signals. A nozzle chamber wall and a roof wall are positioned on the wafer substrate to define a nozzle chamber in fluid communication with the inlet channel, the roof wall defining an ink ejection port in fluid communication with the nozzle chamber. A paddle is positioned in the nozzle chamber and is reciprocally displaceable to eject ink from the ejection port. An actuating arm extends through the nozzle chamber wall and is connected to the paddle. The actuating arm has an actuating portion having a pair of actuating members. One of the actuating members defines a heating circuit such that, on receipt of an electrical signal to the exclusion of the other actuating member, the actuating arm is displaced in one direction as a result of differential thermal expansion. The actuating arm is of a resiliently flexible material such that, when the electrical signal is cut off, the actuating arm is displaced in an opposite direction.
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