Arcuate profiled heatsink apparatus and method
First Claim
1. A cooling apparatus for a heat generating device comprising:
- a substrate, on which is mounted said heat generating device;
a heatsink including a convex arcuate surface, said arcuate surface curved along a single axis, the profile of said convex arcuate surface defined by the following equation;
space="preserve" listing-type="equation">Y=P * C * (X/L-(2 * (X.sup.3 /L.sup.3))+X.sup.4 /L.sup.4) where;
P=a uniformly distributed load along the length L of said convex arcuate surface of said heatsink;
C=the flexural stiffness constant of said substrate;
L=the length of said convex arcuate surface of said heatsink;
X and Y=coordinates defining the curve with respect to a two-dimensional Cartesian coordinate system having an origin on said convex arcuate surface; and
means for maintaining said substrate in close contact with said arcuate surface of said heatsink.
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Accused Products
Abstract
An arcuate profiled heatsink is disclosed, over which is flexed and attached a substrate on which are mounted heat producing, temperature sensitive electronic devices. Flexing the substrate to conform with the arcuate surface of the heatsink minimizes air pockets between the two, which would ordinarily result due to warpage resulting from the fabrication of the substrate. The interface between heatsink and substrate, therefore, has lower thermal resistance, thus, increasing thermal conductivity between heatsink and substrate, and increasing the amount of heat dissipated by the heatsink. Because no hard joining of the two parts is required, they may be separated for repair, and stress resulting from thermal expansion mismatch will not be transferred to the substrate.
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Citations
24 Claims
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1. A cooling apparatus for a heat generating device comprising:
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a substrate, on which is mounted said heat generating device; a heatsink including a convex arcuate surface, said arcuate surface curved along a single axis, the profile of said convex arcuate surface defined by the following equation;
space="preserve" listing-type="equation">Y=P * C * (X/L-(2 * (X.sup.3 /L.sup.3))+X.sup.4 /L.sup.4)where; P=a uniformly distributed load along the length L of said convex arcuate surface of said heatsink; C=the flexural stiffness constant of said substrate; L=the length of said convex arcuate surface of said heatsink; X and Y=coordinates defining the curve with respect to a two-dimensional Cartesian coordinate system having an origin on said convex arcuate surface; and means for maintaining said substrate in close contact with said arcuate surface of said heatsink. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cooling apparatus for a heat generating device comprising:
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a substrate, on which is mounted said heat generating device; a heatsink including a convex arcuate surface, said convex arcuate surface being curved along a width of said heatsink and along a length of said heatsink, the profile of said convex arcuate surface along said width of said heatsink is defined by the following equation;
space="preserve" listing-type="equation">Y=P * C * (X/a-(2 * (X.sup.3 /a.sup.3))+X.sup.4 /a.sup.4)where; P=a uniformly distributed load along said width of said convex arcuate surface of said heatsink; C=the flexural stiffness constant of said substrate. a=the width of said convex arcuate surface of said heatsink; X and Y=coordinates defining the curve with respect to a three-dimensional Cartesian coordinate system having an origin on said convex arcuate surface, with an X axis extending along said width of said heatsink, and a Y axis perpendicular to said X axis; and means for maintaining said substrate in close contact with said arcuate surface of said heatsink. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of producing a cooling apparatus for a heat generating device mounted on a substrate, comprising the steps of:
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measuring the initial warpage of said substrate; if the initial warpage of said substrate is not less than a predetermined value, discarding said substrate; if the initial warpage of said substrate is less than said predetermined value, flexing said substrate over a convex arcuate surface of a heatsink and attaching said substrate to said heatsink using an attachment means such that said substrate and said heatsink are in close thermal contact. - View Dependent Claims (20, 21)
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22. A method of producing a cooling apparatus for a heat generating device mounted on a substrate, comprising the steps of:
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determining relevant characteristics of said substrate, said relevant characteristics of said substrate including the length of said substrate, the Young'"'"'s modulus of the material of said substrate, the moment of inertia of said substrate, the initial warpage of said substrate, and the flexural strength of said substrate; designing and producing a heatsink with a convex arcuate surface based on said characteristics of said substrate; and flexing said substrate over said convex arcuate surface of said heatsink and attaching said substrate to said heatsink using an attachment means such that said substrate and said heatsink are in close thermal contact. - View Dependent Claims (23, 24)
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Specification