International Business Machines Corporation

Carl D Ostergren

Mohanlal Savji Mansuria

Sevgin Oktay

Rolf G Meinert

Ralph E Meagher

Edgar C Leaycraft

John A Paivanas, Deceased

A thermal tester for measuring the efficiency of a heat transfer device for cooling semiconductor chips is disclosed having a positioning means operable to position the heat transfer device in thermal contact with the chip. The positioning means is adjustable in at least 5 degrees of freedom. Temperature sensors are provided to sense the temperature of the chip, the chip support substrate and the positioning means adjacent the heat transfer device. Means is provided to dispose the chip and heat transfer device in a vacuum. Control means is also provided to adjust the temperature of the chip unitl it is the same as the substrate to thereby assure heat transfer occurs only from the chip to the positioning means by way of the heat transfer device. When this thermal balance is achieved the thermal resistance of the heat transfer device can be calculated.

Single chip thermal tester

A device to thermally couple a heat dissipating integrated circuit chip to the heat sink in a thermal conduction module for effective cooling of the chip by minimizing the thermal resistance path from the chip to the sink. The device is a combination of a heat conducting flat based, truncated solid conical disc which is spring loaded on the back of the chip and a heat conductive hat member having an opening with a continuous tapered wall to conformally fit over the truncated conical disc. The gap between the disc and the hat is packed with a thin layer of a high thermal conductivity grease to provide a low interfacial thermal resistance and mechanical flexibility between the disc and the hat. For additional cooling enhancement of the chip, at the interface between the chip back surface and the base of the disc a self-healing alloy having a high thermal conductivity and low melting point is provided.

Thermal conduction disc-chip cooling enhancement means

An improved conduction cooling system for a semiconductor package that includes a slidable conduction cooling piston in contact with a device and mounted in a cap or cold plate, a means for urging the piston longitudinally and laterally into contact with the device and the cap or cold plate, respectively, and a means to prevent rotation of the piston.

Thermal conduction piston for semiconductor packages

An air cooled high density integrated circuit system wherein heat sink structures are located on one of the surfaces of the modules in the system. The heat sink is composed of a plurality of hollow or flat heat conductive bodies having an opening or openings extending from the module surface toward, but not reaching, the top of the hollow heat sink. Means are provided to direct air flow substantially perpendicular to the upper end of the body. The air flow will be from the top of the heat sink and out of the opening or openings to cool the heat sink and the module. The heat sink structure provides greater surface area and effects the breaking up of the boundary layer near the surface of the module for enhanced cooling.

Slotted heat sinks for high powered air cooled modules

A gas encapsulated cooling module wherein at least one semiconductor chip to be cooled is supported on a substrate portion of the module. The provision of thin leaf shaped members each having a relatively long thin planar surface in thermal contact with a planar surface of the chip to be cooled, said thin leaf shaped members each being contained within a module cover, each of said thin leaf shaped members being spring biased in thermal contact with said planar surface of said chip, whereby the relatively long thin planar surface of each thin leaf shaped member is maintained in intimate thermal contact with the planar surface of the chip.

Growing community of inventors

Montgomery, NY, United States of America

Carl D Ostergren