Patent ID: 8003161

Claim:
A method of manufacturing a liquid jet head comprising: forming a piezoelectric element, in a region opposed to each pressure generating chamber communicating with each nozzle orifice for ejecting a droplet, through a vibration plate constituting one side of the pressure generating chamber, wherein the step of forming a piezoelectric element includes: forming a lower electrode film on the vibration plate; forming a piezoelectric layer on the lower electrode film; and forming an upper electrode film on the piezoelectric layer, and wherein the piezoelectric layer composed of a plurality of piezoelectric films is laminated by repeatedly performing a piezoelectric layer forming process of: forming a piezoelectric precursor film by coating sol made of an organic metal compound; a first drying the piezoelectric precursor film by heating the piezoelectric precursor film to a temperature lower than a boiling point of a solvent which is a main solvent of the sol and then holding the piezoelectric precursor film at the temperature for a predetermined period of time; a second drying the piezoelectric precursor film further by heating the piezoelectric precursor film to a temperature equal to or higher than the boiling point of the solvent and then holding the piezoelectric precursor film at the temperature for another predetermined period of time; degreasing the piezoelectric precursor film by heating the piezoelectric precursor film to a temperature higher than the boiling point of the solvent; and baking the piezoelectric precursor film to crystallize the piezoelectric precursor film into the piezoelectric film, wherein a rate of temperature rise in the degreasing is a range from 0.5 to 1.5 degrees C./sec, wherein a temperature to be attained in the degreasing is higher by a temperature selected from a range from 100 to 300 degrees C. than the boiling point of the solvent which is the main solvent of the sol, and wherein a temperature of the baking is 680 degrees C. or above.