An ultrasonic irradiation apparatus irradiates ultrasonic waves onto a wide area having three-dimensionally curved surfaces. An ultrasonic irradiator having a plurality of ultrasonic transducer is arranged in a plane. The position of at least a portion of the ultrasonic transducers is mutually and flexibly...http://www.google.de/patents/US7399284?utm_source=gb-gplus-sharePatent US7399284 - Ultrasonic irradiation apparatus
