Patent ID: 7465032
Filing Date: 2008-12-16
Classification: B41J

Abstract:
1. An inkjet printhead comprising: an array of ink chambers, each having a nozzle, a thermal actuator for ejecting ink through the nozzle, each of the thermal actuators having a heater element extending between two contacts, an inlet opening allowing ink to refill the chamber and a filter structure at the inlet opening; and a drive circuitry for selectively providing the thermal actuators with drive signals such that their contacts form an electrical connection with respective electrodes provided by the drive circuitry, the thermal actuator being a unitary planar structure; wherein, the filter structure has rows of obstructions extending transverse to the flow direction through the opening, the obstructions in each row being spaced such that they are out of registration with the obstructions in an adjacent row with respect to the flow direction.