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This arrangement provides more efficient heat transfer from a circuit chip to an enclosing module cover or cap.
English (United States)
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Heat Transfer Apparatus
This arrangement provides more efficient heat transfer from a circuit chip to
an enclosing module cover or cap.
As shown, the cap 3 has a recess or well 5 therein, in which a piston 7 is
placed, having a sliding fit in the well. The lower face 9 of piston 7 engages the
upper face of circuit chip 11, which is electrically and mechanically connected to
a base element or substrate 13. In previous arrangements, the piston 7 was
maintained in contact with chip 11 by a spiral compression spring in the space
between the top of well 5 and the top of piston 7.
In this arrangement, the spring is replaced by a flexible heat pipe 15. In a
preferred embodiment, heat pipe 15 comprises a closed metallic bellows-like
container, housing a quantity of liquid coolant. In operation, the compression
force of the flexible heat pipe 15 maintains piston 7 in good thermal contact with
chip 11, and also provides an efficient thermal path from piston 7 to the cap 3.
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