Patent ID: 6078125
Filing Date: 2000-06-20
Classification: B06B,B23K

Abstract:
An ultrasonic apparatus comprising:an elongate horn dimensioned to be mechanically resonant as a full wavelength resonator for vibrations of predetermined frequency in the ultrasonic frequency range traveling longitudinally through the horn and when resonant exhibiting two radial end surfaces disposed at respective antinodal regions of said vibrations, said end surfaces moving reciprocatingly in phase in the longitudinal direction;a pair of electroacoustic transducers, one transducer coupled to each of said end surfaces for coupling vibrations of said frequency to said horn responsive to said transducers being energized with alternating current at said frequency, and said transducers operating in a manner to cause their vibration mode to be substantially 180 degrees out of phase with one another when said transducers are energized in parallel and in phase, anda workpiece engaging surface disposed on said horn at a further antinodal region located substantially medially between said respective antinodal regions for coupling vibrations to a workpiece.