Patent ID: 7565994

Claim:
A wire bonding apparatus comprising: a bonding arm having a capillary, a piezoelectric element provided in the vicinity of said capillary so as to cause said capillary to vibrate in an axial direction of said bonding arm, and a preparatory pressure application means provided in said bonding arm so as to apply a preparatory pressure to said piezoelectric element; wherein said preparatory pressure application means is comprised of: a front wedge-form attachment base and a rear wedge-form attachment base that are provided behind said piezoelectric element, and a preparatory pressure bolt that is screwed in said rear wedge-form attachment base from an outside of said bonding arm; and wherein a preparatory pressure is applied to said piezoelectric element by a movement of said front wedge-form attachment base in said axial direction of said bonding arm that is caused by a movement of said rear wedge-form attachment base in a direction of said preparatory pressure bolt as a result of a rotation of said preparatory pressure bolt.