Ultrasonic wire bonding tool

Metal fusion bonding – Including means to force or clamp work portions together... – Work portion comprises electrical component

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228 54, 228 11, B23K 302

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047780975

ABSTRACT:
A tool for use in ultrasonically bonding a wire to a metal surface has a tip having a compound curved channel having a central concave surface and a peripheral non-convex surface along each edge of the central surface. The central surface has a cross-sectional shape similar to that of a portion of the wire's cross section. The total cross-sectional area of the channel should be at least 50% and less than 100% of the wire's cross-sectional area. In a preferred embodiment, the cross section of the central surface is an arc of a circle approximately centered on a line drawn between the outer edges of the peripheral surfaces of the channel. The preferred embodiment also has a beveled surface intersecting an end of the channel to provide a gradual transition for the wire shape from the bond to the undistorted wire.
The tool when used to bond an appropriate wire by an ultrasonic bonding machine produces a wire whose outer shape in the bond area conforms to the shape of this tool's channel. The bond area attaches the wire to a metal pad with superior pull strength and electrical contact characteristics.

REFERENCES:
patent: 3593906 (1971-07-01), Hug
patent: 3711341 (1973-01-01), Joshi et al.
patent: 3934783 (1976-01-01), Harrison
patent: 3971499 (1976-07-01), Goodrich et al.
patent: 4030657 (1977-07-01), Scheffer
patent: 4063673 (1977-12-01), Gaicki
"Ultrasonic Bonding Tools", Jan. 1985.

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