Piezoelectric actuator and piezoelectric ink jet head for three-dimensional rapid printing micro spray head

The invention provides a piezoelectric actuator and a piezoelectric ink jet head for a three-dimensional rapid printing micro spray head. The piezoelectric actuator comprises a piezoelectric element and a composite material substrate; the composite material substrate is provided with a printing circuit used for applying voltage to independent electrode units, and the piezoelectric element comprises a piezoelectric ceramic piece and an inner electrode; and the inner electrode comprises a plurality of independent electrode units, the independent electrode units are all arranged on the contact surfaces between the piezoelectric ceramic piece and the composite material substrate, and the independent electrode units are externally connected to the printed circuit of the composite material substrate. According to the piezoelectric actuator for the three-dimensional rapid printing micro spray head, compared with the prior art, the structure is simple, the number of parts is small, machining is convenient, and requir