Patent ID: 6227653
Filing Date: 2001-05-08
Classification: B41J,B82Y,G06K,G11C,H04N

Abstract:
A nozzle arrangement for an ink jet printhead, the nozzle arrangement including:a wafer substrate having an ink channel defined through the wafer substrate;wall portions, which are formed on the wafer substrate and which define a nozzle chamber and an ink ejection port, the wall portions being formed so that the nozzle chamber can be supplied with ink via the ink channel; andan actuator that is positioned within the nozzle chamber, between the ink ejection port and the ink channel, the actuator having a bottom surface and a top surface facing the ink ejection port, and the actuator comprising a heater positioned within an expansion material which expands up on heating the actuator being such that the bottom surface heats to a greater extent than the top surface so that, on operation of the heater, the expansion material at the bottom surface expands to a greater extent than the expansion material at the top surface resulting in displacement of the actuator towards the ink ejection port, and an ejection of ink.