US Patent 7712878 Liquid ejecting head and method for manufacturing the same

A liquid ejecting head includes a flow channel substrate having a pressure generating chamber communicating with a nozzle aperture through which liquid is ejected, and a piezoelectric element disposed on one surface of the flow channel substrate. The piezoelectric element includes a common electrode, a piezoelectric layer, and an individual electrode. The piezoelectric layer is made of lead zirconate titanate having a rhombohedral or monoclinic crystal structure preferentially oriented in the (100) plane. The saturated polarization Pm and the residual polarization Pr of the piezoelectric layer satisfy the relationship 33%≦2Pr/2Pm≦46%.