Patent ID: 7246888

Claim:
A liquid jetting head comprising: a nozzle plate, provided with a plurality of nozzle orifices; a liquid passage plate, having a first face and a second face which are opposite to each other, and provided with a plurality of grooves which are arranged in a first direction perpendicular to a longitudinal direction of the groove on the first face, each groove having a communication port which passes through from the first face to the second face; and a sealing plate for sealing opening faces of the grooves, wherein the sealing plate is jointed to the first face so that a plurality of pressure generating chambers are formed; wherein the nozzle plate is jointed to the second face such that the communication holes are communicated with the nozzle orifices respectively; wherein a thickness of root portions of bulkhead portions, which partition adjacent pressure generating chambers, is formed thicker than a thickness of top end portions thereof.