Patent ID: 7976136

Claim:
A head chip for ejecting liquid toward a recording medium, comprising: an actuator plate having a plurality of grooves to be filled with the liquid, 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, increases pressure within each of the plurality of grooves by deforming the side wall when a drive voltage is applied to the drive electrode, and causes 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 has an introduction aperture from which the liquid is introduced into the plurality of grooves; a nozzle plate which is fixed to an end surface of the actuator plate through an adhesive, and has a plurality of nozzle openings formed at the same intervals as intervals of the plurality of grooves in the horizontal width direction; and a number of escape holes which are formed between the nozzle plate and the actuator plate and allow the plurality of nozzle openings and the plurality of grooves to communicate with each other, 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 the adhesive remaining at a time of fixing the nozzle plate is accumulated in the plurality of escape holes, and wherein the plurality of nozzle openings and the plurality of escape holes are so arranged as to be displaced from adjacent nozzle openings and adjacent escape holes by a given distance in a vertical width direction of the nozzle plate, which is orthogonal to the horizontal width direction.