METHOD OF EVALUATING BONDING WIRE

摘要

PROBLEM TO BE SOLVED: To enable the adequate evaluation of the property of a bonding wire by measuring the reverse angle at bonding and the tensile strength when pulled by tweezers. SOLUTION: The ball neck part n of bonding is bent by the reverse movement of a capillary at the bonding. By measuring the angle of bending and the strength of the wire when pulled by the tweezers, the property of the bonding wire can be judged and evaluated quantitatively without observing the wrinkles or the thinning of the ball neck part by magnifying it as before. The testing method of pulling by tweezers is that the bonded wire is cut at the length from the ball part enough to clamp it, the other end of the wire that is connected to the ball part is clamped and pulled vertically or in the direction of a loop and the tensile strength is measured.