Patent ID: 8960866
Filing Date: 2015-02-24
Classification: B41J,H01L

Abstract:
1. An electromechanical transducer element comprising: a first electrode disposed on a substrate; an electromechanical transducer film disposed on a first portion of the first electrode; and a second electrode disposed on a second portion of the electromechanical transducer film, wherein an actuator portion formed by laminating the substrate, the first electrode, the electromechanical transducer film, and the second electrode has a stiffness such that, in a cross section of the actuator portion, the stiffness gradually increases from an end portion of the actuator portion to a center portion of the actuator portion, and wherein the cross section of the actuator portion has a shape of a meniscus convex lens, wherein the electromechanical transducer film has a film thickness such that, in the cross section of the actuator portion, the film thickness gradually increases from the end portion of the actuator portion to the center portion of the actuator portion, wherein a shape of a film thickness distribution in the cross section of the actuator portion is approximated by a fourth order function Y=−AX wherein, in the fourth order function, the X represents a coordinate position toward one of edges of the electromechanical transducer film with respect to the center portion of the actuator portion, wherein the X is equal to zero at the center portion of the actuator portion, and wherein, in the fourth order function, the Y represents the film thickness at a point where the coordinate position is equal to the X.