Patent ID: 8434656

Claim:
An ultrasonic horn comprising: an ultrasonic horn body; a front end portion of the ultrasonic horn body with a processing device attached thereto; a rear end portion of the ultrasonic horn body larger in diameter than the front end portion of the ultrasonic horn body, the rear end portion being cylindrical; an ultrasonic vibrator being located on the rear end portion; a mounting flange provided on both lateral surfaces of the ultrasonic horn body being located between the front end portion and the rear end portion, the mounting flange being at a node position of vibration generated by the ultrasonic vibrator; a circular ring-shaped gap portion having a circular ring-shaped gap, the circular ring-shaped gap extending in a fore-and-aft direction with respect to a center of the mounting flange, being concentric with a horn centerline in a longitudinal direction of the ultrasonic horn body, and the circular ring-shaped gap having a length being equal to or greater than a thickness of the mounting flange; a center hole provided on a same axis as a central axis in a longitudinal direction of the ultrasonic horn body, the center hole having a threaded part being opened from a rear end portion of the ultrasonic horn on a same axis as a central axis in a longitudinal direction thereof; a center rod provided on a same axis as the center hole, an outer diameter dimension of the center rod being smaller than a bore of the center hole; a fixing screw having a pointed end portion, an outer diameter of the fixing screw being smaller than the bore at a center portion of the circular ring-shaped gap portion, and the fixing screw being screwed into the threaded part of the center hole from a rear end portion side of the ultrasonic horn body; and a nut for tightening the ultrasonic vibrator to secure the ultrasonic horn body; wherein a back end of the bore and a front end of the bore in the longitudinal direction of the ultrasonic horn body have a larger diameter than the center portion of the bore located in the flange region.