Patent ID: 7517061
Filing Date: 2009-04-14
Classification: B41J,Y10T

Abstract:
1. A multi-nozzle ink jet head having a plurality of nozzles and a plurality of pressure chambers; comprising: (a) a nozzle member in which is formed said plurality of nozzles; (b) a pressure chamber wall member including the plurality of pressure chambers formed therein, and having respective openings thereof defining edges of the plurality of pressure chambers, and (c) piezoelectric type actuators that include a diaphragm and a plurality of piezo elements, and apply pressure to each of said plurality of pressure chambers for ejecting ink from said nozzles; the pressure chamber wall member including pressure chamber sidewalis extending from the openings, the sidewalls respectively further comprising a higher-rigidity first pressure chamber wall base part and a lower-rigidity second pressure chamber wall base part; the higher-rigidity first pressure chamber wall base part being thinner than the lower-rigidity second pressure chamber wall, base part, being arranged between the diaphragm and die lower-rigidity second pressure chamber wall base part, and being in contact with the lower-rigidity second pressure chamber wall base part at a position, the position being at a distance away from the respective opening, the distance being in a direction from the actuators toward the nozzles.