Tcm-Like Device With Piston and Hat Having Interfitting Concentric Cylindrical Walls for Increased Surface Area
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
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.