Patent ID: 6255132
Filing Date: 2001-07-03
Classification: H01L

Abstract:
A method of lining up micro-balls whereby the micro-balls to be formed into bumps are lined up on an arraying jig, and the micro-balls lined up are provided to a transfer jig; said method comprising:a micro-ball receiving step for causing the micro-balls to be maintained at a plurality of array holes by supplying the micro-balls onto the arraying jig having the plurality of array holes formed therein and by suction of air through the array holes;a micro-ball distribution step for distributing the micro-balls placed on the arraying jig into the respective array holes;an excessive micro-ball removal step for removing an excess of the micro-balls from the arraying jig; anda micro-ball supply step for supplying the micro-balls to the transfer jig of a transfer head;wherein, in the excessive micro-ball removal step, a cylindrical body is disposed over the arraying jig, a standing wave having nodes thereof formed concentrically by air vibration is generated from inside the cylindrical body by subjecting the cylindrical body to ultrasonic vibration, and the excess of the micro-balls at the arraying jig is concentrated at the nodes of the standing wave before removal of the excess micro-balls by moving the cylindrical body horizontally over the arraying jig.