Patent ID: 6863206

Claim:
A bonding apparatus comprising: an ultrasonic horn which holds a capillary at one end thereof, a horn holder which holds said ultrasonic horn, a swing arm which supports in a rotatable fashion said horn holder, said swing arm being attached at an upper portion thereof to a bonding head so as to be swingable, auxiliary arms which are rotatably supported at front ends thereof by said bonding head and are rotatably supported at rear portions thereof by said horn holder, and a driving motor which drives a rear portion of said horn holder; wherein a center of rotation of said horn holder with respect to said swing arm is disposed above a hypothetical center of a horizontal line that extends from a tip end of said capillary, a center of rotation of said auxiliary arms with respect to said bonding head is disposed on a rear side of said center of rotation of said horn holder with respect to said swing arm and at substantially same height as said center of rotation of said horn holder; and a center of rotation of said auxiliary arms with respect to said horn holder is disposed at an intersection point of: an extension of a line connecting said tip end of said capillary and said center of rotation of said horn holder with respect to said swing arm, and an extension of a line connecting said hypothetical center and said center of rotation of said auxiliary arms with respect to said bonding head.