Liquid droplet ejection head

Abstract

A droplet ejection head provided with a piezoelectric actuator made by using a KNbO3—NaNbO3 piezoelectric porcelain composition which exhibits a larger piezoelectric constant than those of conventional ones and does not have any secondary phase transition point in the neighborhood of room temperature (from 10 to 40° C.) and which is suitable for use in the piezoelectric actuator of a droplet ejection head, that is, a droplet ejection head characterized by being provided with a piezoelectric actuator made by using a piezoelectric porcelain composition represented by the general formula: (1−y−z−w)(KxNa1−x)NbO3+yLiNbO3+zSrTiO3+wBiFeO3, wherein (KxNa1−x)NbO3 represents potassium sodium niobate; LiNbO3 represents lithium niobate; SrTiO3 represents strontium titanate; and BiFeO3 represents bismuth ferrate; with the proviso that 0.4<x<0.6, 0<y≦0.1, 0<z<0.1, 0<w<0.09, and 0.03<y+z+w≦0.12.

Dependencies are inferred from the claim text.