Self-adjusting heat sink design for VLSI packages

Details Self-adjusting heat sink design for VLSI packages Self-adjusting heat sink design for VLSI packages

1990-10-19

1992-04-21

Hille, Rolf

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

357 79, 357 80, 361386, 165 802, H01L 2302, H01L 2342, H01L 2344, H01L 2346

Patent

active

051073307

ABSTRACT:
The present invention is an electronic circuit, such as a Hybrid Integrated Circuit (HIC), having an element mounted on a suitable support base, and a self-adjusting heat sink mounted on the element. A heat spreader is located in spaced relationship with the support base. The heat spreader may be a plate of conductive material provided especially or may form a part of a housing enclosing the HIC. The heat sink has a bottom portion secured to the element and at least one flange for conducting heat energy to the heat spreader. Each flange includes an upright segment projecting from the bottom portion of the heat sink toward the heat spreader, a free end segment bent away from the heat spreader and a knee-bend segment intermediate the upright segment and the free-end segment and adjacent to the heat spreader. Each flange is also provided with a thermally responsive section, hereinafter referred to as "thermostat", which forms a part of the upright segment and in response to the presence or absence of a certain amount of heat energy causes movement of the free end segment of the heat sink, respectively, toward or away from the heat spreader so as to establish a greater or lesser area of contact with the heat spreader. This thermostat is formable in several ways including inlaying into an upright segment of the flange a metal with a coefficient of thermal expansion different from that of the flange or by attaching such a metal to the upright segment.

REFERENCES:
patent: 4408220 (1983-10-01), Calabro
patent: 4479140 (1984-10-01), Horvath
patent: 4508163 (1985-04-01), McCarthy
patent: 4605986 (1986-08-01), Bentz et al.
patent: 4712159 (1987-12-01), Clemens
patent: 4849856 (1989-07-01), Funari et al.

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