Bond testing machine having an adjustable and self-centering hook

Abstract

Abstract A SELF-CENTERING HOOK ASSEMBLY IS SUSPENDED FROM ONE END OF A PIVOTING BALANCED BEAM. THE BEAM IS LOADED WITH A WEIGHT AS A FUNCTION OF A REQUIRED PULLING FORCE TO BE APPLIED BY SAID HOOK ASSEMBLY. A TEST CIRCUIT IS MOVED UNDER THE HOOK AND THE BEAM IS TILTED TO PERMIT THE HOOK TO ENGAGE AN INTERCONNECT WIRE OF A MICROELECTRONIC CIRCUIT. A MECHANICAL STOP IS PROVIDED SO THAT THE HOOK IS LOWERED THE MINIMUM DISTANCE REQUIRED TO ENGAGE A CONDUCTOR WITHOUT CONTACTING THE SUBSTRATE OF THE CIRCUIT. AFTER A WIRE HAS BEEN ENGAGED, THE BEAM IS PERMITTED TO PIVOT UPWARDS IN RESPONSE TO HE APPLIED LOAD. AN UPPER MECHANICAL STOP IS PROVIDED TO PREVENT EXCESSIVE PIVOTING AND TO TEST THE VERTICAL SLACK OF THE CONDUCTOR. IF THE BOND OF THE INTERCONNECT WIRE OR ITS VERTICAL SLACK IS WITHIN THE REQIRED LIMITS, THE UPPER MECHANICAL STOP IS NOT CONTACTED AND A SUCCESSFUL TEST IS INDICATED. IF THE MECHANICAL STOP IS CONTACTED, AN UNSUCCESSFUL TEST IS INDICATED. THE MACHINE ALSO INCLUDES MEANS FOR ADJUSTING THE UPPER AND LOWER MECHANICAL TOPS INDIVIDUALLY AND JOINTLY SO THAT DIFFERENT AMOUNTS OF VERTICAL SLACK AND BOND STRENGTHS CAN BE TESTED AND TO ACCOMMODATE CIRCUITS HAVING DIFFERENT SUBSTRATE THICKNESSES.

Inventors

• 👤 John W Slemmons
• 👤 Brooks T Hogan

Bibliographic Details