US Patent 7669977 Nozzle device with expansive chamber-defining layer

A nozzle device is provided for an inkjet printhead. The nozzle device includes a substrate assembly defining an ink supply. A chamber-defining layer defines a nozzle chamber in fluid communication with a nozzle opening and the ink supply. An actuating arm is coupled to the substrate assembly and terminates in a paddle separating the ink supply and the nozzle chamber. The arm includes a thermal bend portion proximal to the substrate assembly, and is configured to bend during actuation so that the paddle moves and causes ink within the nozzle chamber to be ejected out through the nozzle opening.