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Tcm-Like Device With Piston and Hat Having Interfitting Concentric Cylindrical Walls for Increased Surface Area

IP.com Disclosure Number: IPCOM000034592D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Eid, JC: AUTHOR [+4]

Abstract

In some circuit modules, a floating metal piston establishes a heat transfer path between a semiconductor chip and a metal structure, called a hat, which is cooled by water. The chips are mounted on a thin square dielectric substrate, and the hat is attached to the substrate to form an enclosure for the chips. A piston is made separable from the associated chip for ease of manufacturing, and it is made slideable in the hat to adjust to chips of differing height above the substrate. In an improved circuit module, the piston and the hat have interfitting cylindrical grooves and walls that form a surface of extended area between the hat and the piston. In one embodiment, the upper part of a piston has an upwardly open cup shape with thin cylindrical side walls.

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Tcm-Like Device With Piston and Hat Having Interfitting Concentric Cylindrical Walls for Increased Surface Area

In some circuit modules, a floating metal piston establishes a heat transfer path between a semiconductor chip and a metal structure, called a hat, which is cooled by water. The chips are mounted on a thin square dielectric substrate, and the hat is attached to the substrate to form an enclosure for the chips. A piston is made separable from the associated chip for ease of manufacturing, and it is made slideable in the hat to adjust to chips of differing height above the substrate. In an improved circuit module, the piston and the hat have interfitting cylindrical grooves and walls that form a surface of extended area between the hat and the piston. In one embodiment, the upper part of a piston has an upwardly open cup shape with thin cylindrical side walls. The hat has a complementary structure that comprises a post that extends downward into the cup of the piston and a cylindrical groove that receives the cylindrical walls of the piston. A circular spring is located between the upper rim of the piston and the top of the corresponding groove of the hat.

(Image Omitted)

In a second embodiment, the piston has the outer thin cylindrical walls of the first embodiment and also has a center post. The center post of the hat has a cylindrical hole that receives the center post of the piston. In a third embodiment, the piston has an upwardly extending center po...