Patent ID: 8157354

Claim:
A head chip for ejecting liquid toward a recording medium, comprising: an actuator plate having a plurality of grooves that are to be filled with the liquid and that are formed at given intervals in a horizontal width direction; a drive electrode which is formed on each side wall of each of the plurality of grooves and which increases pressure within each of the plurality of grooves by deforming the side wall when a drive voltage is applied to the drive electrode to cause the filled liquid to be ejected from an inside of each of the plurality of grooves; a cover plate which is stacked on the actuator plate and which has an introduction aperture from which the liquid is introduced into the plurality of grooves; a nozzle plate fixed to an end surface of the actuator plate through an adhesive, the nozzle plate having a plurality of nozzle openings which communicate with the plurality of grooves, respectively, and which are each formed at a position facing a corresponding one of the plurality of the grooves; and a number of escape holes formed between the nozzle plate and the actuator plate, the number corresponding to a number of the plurality of nozzle openings, wherein each of the plurality of escape holes has a contour which surrounds a periphery of each of the plurality of nozzle openings with the contour being spaced apart from a contour of each of the plurality of nozzle openings by at least a given distance, wherein each of the plurality of nozzle openings has a circular contour having a center that is located in the middle of each of the plurality of grooves in the horizontal width direction, and the circular contour has a diameter that is larger in size than a horizontal width of each of the plurality of grooves, and wherein the adhesive remaining at a time of fixing the nozzle plate is accumulated in the plurality of escape holes.