Metal fusion bonding – Process – With condition responsive – program – or timing control
Patent
1986-06-30
1988-09-20
Godici, Nicholas P.
Metal fusion bonding
Process
With condition responsive, program, or timing control
228 45, 228179, 228 10, 228 11, B23K 3700
Patent
active
047719303
ABSTRACT:
A novel and improved monitoring and detecting circuit is provided for an automatic wedge wire bonder. The detecting circuit is initiated at the second wire bond while the bonding tool is pressing the bonding wire on the pad or electrode. If the fine wire is missing under the working face of the bonding tool, the sensing circuit initiates a signal which is detected by control means so as to initiate an interrupt signal stopping the operation of the wire bonder. Sensing of the presence or absence of a wire under the bonding wedge at a bond may take place at a first or a second wire bond. At the second wire bond, the novel sensing and detecting circuit is actuated to determine the amount of longation that takes place in the bonding wire between the bonding wedge and the wire clamps so as to correct the movement of the wire clamps when supplying a tail under the working face of the bonding tool and to ensure that a uniform tail length is supplied unaffected by the elongation of the bonding wire.
REFERENCES:
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patent: 4586642 (1986-05-01), Drubelbis et al.
Gillotti Gary S.
Leonhardt David A.
Godici Nicholas P.
Kulicke and Soffa Industries Inc.
Skillman Karen
Sowell John B.
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