Browse Prior Art Database

Spring Sheet Chip Cooling Device

IP.com Disclosure Number: IPCOM000110162D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Horvath, JL: AUTHOR [+3]

Abstract

Chemically machined and formed from a thin sheet of a high thermal conductive material, this chip cooling device is interposed between the chip and a surface which has a low resistance thermal path to flowing air or water.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 75% of the total text.

Spring Sheet Chip Cooling Device

       Chemically machined and formed from a thin sheet of a
high thermal conductive material, this chip cooling device is
interposed between the chip and a surface which has a low resistance
thermal path to flowing air or water.

      The figure shows a 5 x 5 version of the device.  Each of the
25 elements is formed into a "lazy-S" shape.  In any row, all the
elements are rotated in the same direction.  In any column, the
direction of rotation alternates.  Each element is shaped and rotated
so that, at the maximum operating separation between chip and hat
surfaces, the contacts will be tangent to the element and near the
tips of the element.  As the chip to hat separation decreases, the
element rocks or rotates with little change in shape and the points
of tangent move toward the center of the "S".

      The force and the spring action for holding each element in
contact with the chip and with the hat, is supplied by the tabs
connecting one element with another.  As adjacent elements in a
column of elements rotate relative to each other, due to a decreasing
separation between chip and hat during assembly of the module, the
connecting tabs joining them are subjected to torsion.  This torsion
resists the rotation of the elements.  Depending on the amount of
element rotation, material properties and dimensions, the material of
the connecting tab may well yield, however, it will always have some
amount of elastic recovery...