Patent ID: 8465810

Claim:
A method for forming a piezoelectric/pyroelectric film on a material to be coated by an electric field coating and electric field polarization, the method comprising the steps of: forming an electric field between the material to be coated and a coating sprayer by applying a high voltage of −1 kV to −90 kV to an electrode needle at a tip of the coating sprayer facing a coating surface of the material to be coated, while maintaining the material to be coated positively charged; forming a precursor polarization film on the material to be coated by spraying an inert gas from an inert gas spraying nozzle at the tip of the coating sprayer onto the material to be coated, simultaneously spraying a solution with a dielectric substance dissolved in a solvent onto the material to be coated from a dielectric solution spraying nozzle at the tip of the coating sprayer, the dielectric solution spraying nozzle having the electrode needle at a center thereof, and giving negative charge to droplets of the dielectric solution, while moving the coating sprayer; discharging all of the dielectric solution remaining in the dielectric solution spraying nozzle by temporarily stopping the electric field coating, moving the coating sprayer facing the material to be coated to face outside the material to be coated, and discharging the inert gas from the dielectric solution spraying nozzle of the coating sprayer; and forming a piezoelectric/pyroelectric film on the material to be coated by returning the coating sprayer to an original position, forming the electric field between the material to be coated and the coating sprayer again, and further polarizing the precursor polarization film.