Patent ID: 7543918

Claim:
A liquid jetting head which jets a liquid, comprising: a channel unit in which a plurality of pressure chambers separated mutually by partition walls, a plurality of nozzles, and a plurality of individual liquid channels each reaching one of the nozzles via one of the pressure chambers are formed; and a piezoelectric actuator which applies a jetting energy to the liquid in the pressure chambers, and which includes a plate which is fixed to the partition walls to define the pressure chambers, and which has an electroconductive surface on a side opposite to the pressure chambers; a piezoelectric layer which is formed on the plate at an area on a surface of the plate on the side opposite to the pressure chambers; an electroconductive layer which is formed on the piezoelectric layer at an area on a surface of the piezoelectric layer on a side opposite to the plate; the area on the surface of the plate and the area on the surface of the piezoelectric layer facing all the pressure chambers; and a plurality of individual electrodes each of which is insulated from the electroconductive layer by a first groove formed in the electroconductive layer, along an outer periphery of each of the pressure chambers, and by a recess formed on a central area of one of the pressure chambers with respect to the first groove, wherein: a depth of the first groove is not less than a thickness of the electroconductive layer, and a depth of the recess is greater than the thickness of the electroconductive layer.