Patent ID: 8840559

Claim:
A method for producing an ultrasonic oscillator, comprising: the step of carrying out a polarization treatment to an organic piezoelectric material wherein the organic piezoelectric material comprises hollow particles having an average particle diameter of 10 μm or less, the hollow particles are made of at least one resin selected from the group consisting of a polystyrene resin, an acrylic resin, a styrene acrylic resin, a polyethylene resin, a polypropylene resin, a polyacetal resin, a chlorinated polyether resin, polyvinyl chloride resin, a phenol-formaldehyde resin, a urea-formaldehyde resin, a melamine-formaldehyde resin, a furan resin and an unsaturated polyester resin, and the polarization treatment is carried out at one of the moments of: before providing two electrodes on both surfaces of the organic piezoelectric material; after providing one of the two electrodes on one of the surfaces of the organic piezoelectric material; and after providing the two electrodes on the both surfaces of the organic piezoelectric material.