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Thermal Conduction Module With Helical Pistons

IP.com Disclosure Number: IPCOM000039510D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Eid, JC: AUTHOR [+2]

Abstract

In a circuit module called a TCM (thermal conduction module), a metal structure called a hat is mounted above a thin square chip carrier and forms part of an enclosure for chips that are mounted on the chip carrier. Pistons, which are carried in downwardly-facing cylindrical holes in the hat, are spring loaded, and each contact a chip and carry heat from the chip upward to the hat. The hat is cooled by a cold plate that carries chilled water. (The orientation of the TCM in this description is arbitrary.) In this cold plate the pistons are helical and are threaded into the cylinders of the hat. A torsion spring rotationally biases each piston in a direction to move downwardly out of the cylinder to contact a chip.

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Thermal Conduction Module With Helical Pistons

In a circuit module called a TCM (thermal conduction module), a metal structure called a hat is mounted above a thin square chip carrier and forms part of an enclosure for chips that are mounted on the chip carrier. Pistons, which are carried in downwardly-facing cylindrical holes in the hat, are spring loaded, and each contact a chip and carry heat from the chip upward to the hat. The hat is cooled by a cold plate that carries chilled water. (The orientation of the TCM in this description is arbitrary.) In this cold plate the pistons are helical and are threaded into the cylinders of the hat. A torsion spring rotationally biases each piston in a direction to move downwardly out of the cylinder to contact a chip. As the piston continues to rotate slightly after it reaches the chip position, the upper surface of the threads on the piston contact the lower surface of the threads in the hat. The helical threads increase the area for contact between the piston and the hat and thereby permit the TCM to handle chips of higher power. The piston has an upwardly-extending rod with a small knob on top, and the hat has a corresponding hole at the top of each cylindrical opening. A flexible retaining plate has a corresponding set of holes that are of an appropriate size to grip the rod when the knob is pushed through a hole. For assembling the pistons, the springs and the hat, the retaining plate is placed over the top of the ha...