Patent ID: 8197035
Filing Date: 2012-06-12
Classification: B41J,H01L

Abstract:
1. An actuator device comprising: a substrate with a surface; a lower electrode formed on the surface of the substrate including a first portion which follows the surface of the substrate and a second portion which is inclined towards the surface of the substrate; a piezoelectric layer disposed on the lower electrode, the piezoelectric layer having a plurality of columnar crystals and an upper surface which follows the surface of the substrate; and an upper electrode formed on the piezoelectric layer; wherein the columnar crystals of the piezoelectric layer extend orthogonally from the second portion of the lower electrode and extend orthogonally to the upper surface of the piezoelectric layer, wherein the columnar crystals extending from the second portion have greater grain widths than the columnar crystals extending from the first portion in a direction from the second portion to the first portion at the upper surface of the piezoelectric layer.