Heat sink
First Claim
1. A heat sink for an element to be cooled comprising:
- a base;
a plurality of pins extending substantially perpendicular to the base, said pins being arranged in a predetermined pattern; and
at least one projection integral with said base, extending from the side thereof adjacent the element to be cooled and having an area for the projection surface parallel to the side from which it extends and adapted to make thermal contact with the element to be cooled which is sufficient to provide good thermal transfer between the heat sink and the element while maintaining the area of contact to a fraction of the base area sufficiently small to assure that uneven thermal expansion between the heat sink and element does not cause damage to the element.
7 Assignments
0 Petitions
Accused Products
Abstract
A heat sink adapted for use with VLSI and other integrated circuit elements which includes a base adapted to be in thermal contact with the element to be cooled, there preferably being at least one projection from the side of the base adapted to be adjacent to the element, and a plurality of pins extending from the other side of the base in a direction substantially perpendicular thereto. The projection from the base may either be in the form of a center pedestal which is secured to the element to be cooled by a suitable adhesive, limiting the thermal stress area, or may be a plurality of projections formed in a predetermined pattern which are adapted to be in physical contact with the element and to provide a controlled standoff therefrom which defines a uniform adhesive bond line. The heat sink also preferably provides a means for reducing the temperature gradient between the center pins and peripheral pins which results from the center of the integrated circuit typically being hotter than the outer areas. For a preferred embodiment, this is acomplished by having a dish-shaped base which provides improved heat transfer to the outer pins.
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Citations
21 Claims
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1. A heat sink for an element to be cooled comprising:
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a base; a plurality of pins extending substantially perpendicular to the base, said pins being arranged in a predetermined pattern; and at least one projection integral with said base, extending from the side thereof adjacent the element to be cooled and having an area for the projection surface parallel to the side from which it extends and adapted to make thermal contact with the element to be cooled which is sufficient to provide good thermal transfer between the heat sink and the element while maintaining the area of contact to a fraction of the base area sufficiently small to assure that uneven thermal expansion between the heat sink and element does not cause damage to the element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A heat sink for an element to be cooled which element has at least one portion which is hotter than other portions of the element comprising:
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a base having a central portion and peripheral portions, the base being adapted to be in thermal contact with the element to be cooled with the center portion of the base thermally contacting the hotter portion of said element, the thickness of said base being least in said center portion and increasing in a predetermined way from the center portion to the periphery of the base; a plurality of pins extending substantially perpendicular to the base, said pins being arranged in a predetermined pattern; and the varying thickness of the base being operative to reduce the temperature gradient between pins over said center portion and pins over said peripheral portions. - View Dependent Claims (19, 20, 21)
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Specification