Patent ID: 7207657

Claim:
A nozzle arrangement for an ink jet printhead chip, the nozzle arrangement comprising a wafer substrate having a front surface, a rear surface and a nozzle chamber extending through the wafer substrate to define an inlet at the rear surface of the wafer substrate and an outlet at the front surface of the wafer substrate, the nozzle chamber being in fluid communication with an ink supply at the rear surface of the wafer substrate; a closure member positioned on the rear surface of the substrate and being displaceable between open and closed positions to control a flow of ink through the wafer substrate; and an actuator operatively engaged with the closure member to displace the closure member between the open and closed positions, when activated; wherein, the chamber, the outlet and the actuator are dimensioned with respect to the ink properties such that the ink is retained within the chamber when the closure member is in the closed position by the ink surface across the outlet.