Patent ID: 7517055

Claim:
A nozzle arrangement for an inkjet printhead, the nozzle arrangement comprising: a substrate that defines an ink supply channel; drive circuitry arranged on the substrate; a nozzle chamber structure mounted on the substrate and defining a nozzle chamber in fluid communication with the ink supply channel and a nozzle rim defining an ink ejection port in fluid communication with the nozzle chamber; a post, provided outside of the nozzle chamber, extending from the substrate; and a thermal actuator mechanism comprising an actuator arm extending from the post and terminating freely in the nozzle chamber, the actuator mechanism comprising a pair of spaced conductive layers mounted on opposite sides of the actuator arm with an active one of the layers being connected to the drive circuitry, wherein the drive circuitry for supplying an electrical current to the active layer is interposed between the substrate and the actuator arm.