Patent attributes
An inkjet printhead integrated circuit includes a substrate defining an ink supply channel. An ink chamber structure is arranged on the substrate to define an ink chamber into which ink from the ink supply channel can be supplied and an ink ejection port from which ink can be ejected from the ink chamber and an internal rim interposed between the ink supply channel and the ink chamber. A support extends from the substrate outside the ink chamber. A thermal bend actuator extends from the support and terminates in a paddle within the ink chamber. The thermal bend actuator is configured to move the paddle towards and away from the ink ejection port upon actuation to eject ink in the ink chamber through the ink ejection port. A periphery of the paddle and the internal rim are shaped to limit flow of ink from the ink chamber back into the ink supply channel when the paddle is displaced towards the ink ejection port.
