Patent ID: 7316470

Claim:
An inkjet recording head for ejecting ink in ink channels by deformation of the piezoelectric element, comprising: a partition wall and a bottom wall, respectively formed by making grooves in an actuator substrate made of a polarized piezoelectric element, for forming longitudinal side surface and bottom surface of a plurality of ink channels; a cover plate adhered on an upper surface of the partition wall to form a top surface opposing to the bottom surface of the plurality of ink channels; a nozzle plate, adhered on a front side surface of the actuator substrate, having a nozzle hole for ejecting ink, wherein the cover plate is made of a machinable ceramics, which has a higher thermal conductivity than that of the piezoelectric element, and where Lc and Lp respectively represent the linear thermal expansion coefficient of the cover plate and the piezoelectric element, the relationship of, | Lc−Lp |≦5 ×10 −6 /° C. is satisfied, and a top plate having higher thermal conductivity than the cover plate is adhered with an adhesive agent on the cover plate, wherein a Vickers hardness of the cover plate is not greater than 5.0 GPa.