Patent ID: 8622527

Claim:
A liquid jet head, comprising: a base having a plurality of pressure chambers which comprise recesses, respectively, the plurality of pressure chambers being arranged in a front surface of the base in a predetermined direction; a piezoelectric substrate which is joined to upper surfaces of side walls of the recesses and which closes open ends of the recesses, the piezoelectric substrate being uniformly polarized in a direction parallel to a substrate surface of the piezoelectric substrate; a liquid supply chamber for supplying liquid to the plurality of pressure chambers; orifices for discharging the liquid from the plurality of pressure chambers; and a pair of drive electrodes provided on a front surface of the piezoelectric substrate, which is opposite to the pressure chamber side, and on a back surface of the piezoelectric substrate on the pressure chamber side, respectively, for each pressure chamber and which sandwich the piezoelectric substrate therebetween and extend to a side wall of a corresponding one of the recesses substantially from a center of a corresponding one of the open ends, wherein the liquid supply chamber communicates to the plurality of pressure chambers via openings which are formed in bottom surfaces or side wall surfaces of the recesses, respectively; and the liquid supply chamber is formed in the base along the predetermined direction and communicates to the plurality of pressure chambers.