Patent ID: 7713588

Claim:
A method of forming a piezo-electric film on a surface of a substrate by discharging mixture of gas and fine particles containing piezo-electric material from a nozzle to the surface of the substrate, the method comprising: a first moving step of moving the nozzle discharging the mixture with respect to the substrate along a first direction to form a first piezo-electric band extending along the first direction with a certain width, wherein the first direction extends within a plane that is parallel with the surface of the substrate; a measuring step of measuring thickness distribution along the width of the first piezo-electric band; a calculating step of calculating a shifting distance based on the thickness distribution measured by the measuring step; a shifting step of moving the nozzle with respect to the substrate along a second direction by the calculated shifting distance, wherein the second direction extends within the plane that is parallel with the surface of the substrate and intersects with the first direction; and a second moving step of moving the nozzle discharging the mixture with respect to the substrate along the first direction to form a second piezo-electric band extending along the first direction with a certain width; wherein the piezo-electric film is formed such that the first piezo-electric band and the second piezo-electric band are overlapped in the second direction, and wherein a large amount of the mixture is discharged from a central portion of the nozzle, and a small amount of the mixture is discharged from edge portions of the nozzle.