Browse Prior Art Database

Electronic Chip Lift Machine

IP.com Disclosure Number: IPCOM000079548D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Wenskus, H: AUTHOR

Abstract

This assembly is capable of removing integrated circuit chips from the substrates for rework purposes. Essentially, the assembly selectively ignites a flame and moves it down toward the chip assembly in a predetermined marker, in order to selectively reflow the solder between semiconductor chips and their substrates without thermal shock. Thereafter, a vacuum probe is employed to remove the chip for rework purposes.

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Electronic Chip Lift Machine

This assembly is capable of removing integrated circuit chips from the substrates for rework purposes. Essentially, the assembly selectively ignites a flame and moves it down toward the chip assembly in a predetermined marker, in order to selectively reflow the solder between semiconductor chips and their substrates without thermal shock. Thereafter, a vacuum probe is employed to remove the chip for rework purposes.

The entire assembly is mounted on a vertical and horizontal slide plate 10. The chip lift assembly is schematically depicted at 12 and is controlled by the gear unit 14, which is selectively movable in order to rotate the vacuum probe shown at 16. The vacuum probe is controlled by the vacuum probe bearing holder 18, the vacuum probe shaft 20, and the balancing arrangement comprising the micrometer and vacuum trigger switch 22, and the weight assembly 24 to control the vacuum probe 16 in response to activation of the vacuum probe motor 26. The dial indicator 27 is adjustable to set the vacuum probe down cylinder 30 and the vacuum probe up cylinder 32.

The flame probe assembly 40 is used to selectively and controllably heat the solder pads between a semiconductor chip and a substrate, not shown. This assembly comprises an air cylinder unit 42 under control of a micrometer unit 44 which are activated and slideably controlled by ball slide unit 46, so as to move the extinguisher, flame probe, and igniter unit 50 into operative...