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GAISER LARGE WIRE WEDGE INFORMATION   

2. LARGE WIRE ULTRASONIC BONDING WEDGES - PAGE 2 (2)

The third style of wedge used for large wire utilizes a cutter blade termination method. The bonding tool has either a longitudinal U-groove or V-groove with

a radius at each end. After the second bond has been formed, a cutter blade is used to terminate the wire.

GTC Figure 49-46

Figure 46. This drawing shows a typical U-groove style wedge. 

GTC Figure 49-47

Figure 47. This drawing shows a typical V-groove style wedge.

The bonders using these styles of wedges are normally equipped with a cutter blade positioned in front of the wedge. Following the completion of the second bond, the bonder head moves up and back. The cutter blade is then activated to terminate the wire. The wire is then positioned in the groove for the next bond. The U-groove style wedge is

becoming less popular than the V-groove style wedge. With the U-groove design, the wire deformation occurs along the entire groove during the bonding process. The wire contacts the apex of the groove which leads to excessive aluminum build-up at the FR and BR areas. The U-groove design will require cleaning more often.   

GTC Figure 49-48

Figure 48. This bond is made by a wedge having a U-groove. The flat sections on each side of the bond are referred to as "wings" or "ears".

Gold The V-groove style does not allow the wire to contact the apex of the groove. This reduces the amount of aluminum that comes in contact with the groove, thereby reducing build-up and deformation

of the wire. The V-groove style also reduces the constricting of the wire at the heel of the bond. This produces wires with less heel related problems.

GTC Figure 49-49

Figure 49. This bond is made by a wedge with a V-groove. The outward deformation of the bond is minimized. Note the absence of "ears" on this bond and minimal deformation of the heel area. V-groove wedges usually require less cleaning than U-groove wedges. 

(Photo: courtesy of Ultrasonic Engineering Company.)

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