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Compensating Chuck Assembly For Braze Pin Testing Apparatus

IP.com Disclosure Number: IPCOM000048787D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Comulada, R: AUTHOR [+2]

Abstract

This chuck, for holding a substrate with braze pins to be tested, has an arrangement for accommodating for tolerances between the edge of the substrate and the pins located thereon. The chuck has a plurality of tapered position blocks capable of maintaining the chuck relative to a test fixture as forces are applied to test the pins.

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Compensating Chuck Assembly For Braze Pin Testing Apparatus

This chuck, for holding a substrate with braze pins to be tested, has an arrangement for accommodating for tolerances between the edge of the substrate and the pins located thereon. The chuck has a plurality of tapered position blocks capable of maintaining the chuck relative to a test fixture as forces are applied to test the pins.

Semiconductor packages provided with multilayer ceramic substrates utilize pins brazed to the bottom surface. In order to test the quality of the braze joint between the pin and the substrate, the pins are subjected to a flex test operation where the end of the pin is flexed in four directions.

In this test apparatus, spring-loaded jaws 10 grip the substrate 12 on all four sides thereof, holding the pins 14 in an upward position. The jaws are provided with tapered camming surfaces 16 that mate with position blocks 18 provided with a cam surface 20. Position blocks 18 are movable with pistons 22. Positioning blocks 18 are provided on all four sides of the substrate along with actuating pistons 22. The position blocks 18, the jaws 10 and the spring means 24, for actuating the jaws, are supported on a housing 26. A carriage (not shown) is provided to move the housing 26 between a first station, containing a back plate 28 and pin gauge 30, and a second station, containing a gauge 32 with apertures 34, to receive the end of pins 14 on substrate 12. The carriage is also capable of...