Patent ID: 7108359

Claim:
An ink jet printer head comprising: a head substrate formed by steps of: cutting a pre-polarized piezoelectric member into a predetermined width to form a piezoelectric body, embedding said piezoelectric body into a recess formed in a base member to form said head substrate, said base member being formed of a material different from a material of said piezoelectric member, forming a plurality of grooves in a piezoelectric body-embedded side of said head substrate, and forming an electrically conductive film on inner walls of said grooves; a top plate joined to one side of said head substrate; and a nozzle plate joined to an open side of said grooves, said nozzle plate having an ink jet orifice formed for each of said grooves, wherein a width of said recess at a groove-free portion of said grooved head substrate is set smaller than a width of said recess at a groove-formed position.