Patent ID: 7814919

Claim:
An ultrasonic cleaning apparatus comprising an ultrasonic wave application head which cleans a material at a surface by applying an ultrasonic wave to a cleaning liquid supplied to the surface, the ultrasonic wave application head comprising: a cylindrical ultrasonic wave transmission member, a longitudinal axis of the ultrasonic wave transmission member is configured to be placed perpendicular to the surface to be supplied with the cleaning liquid, the cylindrical ultrasonic wave transmission member having a first end portion including a curved portion to project to the surface, the curved portion having an annular portion surrounding the longitudinal axis of the ultrasonic wave transmission member in a portion closest to the surface; an ultrasonic transducer which is provided on a second end portion over the first end portion of the ultrasonic wave transmission member, and applies an ultrasonic wave to the cleaning liquid on the surface through the ultrasonic wave transmission member; and a preventive portion which is provided in the annular portion at a radial center of the first end portion of the ultrasonic wave transmission member and along the longitudinal axis of the ultrasonic wave transmission member, the preventive portion preventing the ultrasonic wave from passing, wherein the preventive portion is a notch formed on the first end portion of the ultrasonic wave transmission member, and the notch is formed by oblique planes inclined to the surface, and wherein the preventive portion is conical.