Patent ID: 8201722

Claim:
A resonator for joining metal members utilizing ultrasonic vibration, comprising: an ultrasonic horn having a length of at least half wavelength of a resonance frequency of ultrasonic vibration transmitted from a vibrator; a joining tool provided on the ultrasonic horn so as to project in a direction normal to a vibration transmission direction of the ultrasonic horn at a position of a point of a maximum vibration amplitude of the ultrasonic horn; and a tool head comprising a linear bar provided on a distal end of the joining tool; wherein a joining operation portion of the linear bar laterally projects farther than a widest portion of the joining tool, and wherein the distal end of the joining tool has a lateral width portion which is smaller than a lateral width of an upper portion of the joining tool and from which the tool head projects in a direction normal to the direction in which the joining tool projects.