Inkjet printhead having nozzle arrangements with ink spreading prevention rims

1. An inkjet printhead having a plurality of nozzle arrangements each comprising:

walls defining an ink chamber having an ink supply channel and an ink ejection port with an ink spreading prevention rim; and

a thermal actuator mechanism configured to operatively eject ink from the chamber via the ejection port, wherein the ink spreading prevention rim defines a pit for preventing ink from flowing across a surface of the ink jet printhead and affecting operation of said printhead.

2. The inkjet printhead of claim 1 , wherein a nozzle rim and the ink spreading prevention rim are formed via a chemical mechanical planarization technique.

3. The inkjet printhead of claim 1 , wherein the thermal actuator mechanism includes an end paddle attached to an actuator arm which pivots at a post proximate the ink chamber.

4. The inkjet printhead of claim 3 , wherein the actuator arm includes two layers which are formed from a conductive material having a high degree of stiffness, said layers surrounding a central material layer.

5. The inkjet printhead of claim 4 , wherein the conductive material includes titanium nitride.

6. The inkjet printhead of claim 4 , wherein the two layers of the actuator arm are in thermal balance in a quiescent state.

7. The inkjet printhead of claim 4 , wherein the actuator mechanism is actuated by electrical heating of one layer of the actuator arm to provide thermal bending to eject ink from the ink chamber.