H - Electricity – 05 – K
Patent
H - Electricity
05
K
H05K 1/02 (2006.01) H05K 7/20 (2006.01)
Patent
CA 2081606
32 ELECTRONIC UNIT Abstract of the Invention Electronic unit of printed circuit board with electronic components on one side and its other side in heat conducting contact with a heat sink enables the electronic components to be sealed from ambient atmosphere and thus unpackaged chips may be used. The units are mountable in a support frame with air cooling passages of the heat sinks extending vertically for convected cooling air. In each unit, a resistor network may extend into a cavity formed in a heat exchange rib and an electronic chip, perhaps unpackaged in the sealed environment, may be in heat conductive relationship with the heat sink.
Collins Hugh M.
Drayton John B.
Hayes Hasler R.
Katchmar Roman
Moss John S.
Austin Reginald J.
Northern Telecom Limited
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