Patent ID: 7556344
Filing Date: 2009-07-07
Classification: B41J

Abstract:
1. An inkjet printhead comprising a substrate assembly and a plurality of nozzle assemblies arranged in an array on the substrate assembly; each nozzle assembly comprising: an anchor extending from the substrate assembly; a thermal bend actuator connected to the anchor and comprising a pair of beams; a nozzle comprising a crown portion and a skirt portion depending from the crown portion, and defining an opening through which ink can be ejected; an endless wall extending from the substrate assembly and surrounding the skirt portion to define a nozzle chamber in fluid communication with the opening; and a lever arm which connects the thermal bend actuator to the nozzle so that, upon actuation, the actuator moves the nozzle with respect to the wall to vary a volume of the nozzle chamber and thereby eject ink in the nozzle chamber out through the opening, the substrate assembly comprising; a nozzle guard positioned over the nozzle assemblies and having apertures aligned with each opening of the nozzle assemblies; and a wiper blade for wiping an exterior surface of the nozzle guard, said exterior surface having recesses around each aperture.