Enclosure and printed circuit card with heat sink

• US 5,208,733 A
• Filed: 10/30/1991
• Issued: 05/04/1993
• Est. Priority Date: 11/09/1990
• Status: Expired due to Fees

• Current Assignee: Merlin Gerin
• Original Assignee: Merlin Gerin
• Inventors: Besanger, Michel
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): WHANG, YOUNG
• Application Number:
  US07/785,074
• Time in Patent Office: 552 Days
• Field of Search: 361/380, 361/381, 361/382, 361/385, 361/386, 361/387, 361/388, 361/389, 361/397, 361/401, 361/412, 165/80.4, 165/185, 165/104.33, 357/80, 357/81, 357/82
• US Class Current: 361/704
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: H05K 7/1404 by edge clamping, e.g. wedges
• CPC Class Codes: H05K 7/20536 for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment

Abstract

An electronic device including a card having first and second faces opposite each other, electrical devices including at least one of a printed circuit and a plurality of components fixed to the first face of the card, a metal plate spaced apart from the card such that a gap is formed therebetween, a pulp filled within the gap which is more thermally conductive than air, and a plastic insulating film disposed between the pulp and the card. The card, electrical components, the plastic insulating film and the metal plate form an integrated assembly.

Claims

1. An electronic device comprising:

a card having first and second faces opposite each other;

electrical devices comprising at least one of a printed circuit and a plurality of components fixed to said first face of said card;

a metal plate spaced apart from said card such that a gap is formed between said first face and said metal plate;

pulp filled within said gap, wherein said pulp is more thermally conductive than air; and

a plastic insulating film disposed between said pulp and said card, whereby an integrated assembly of said card, said electrical means, said plastic insulating film and said metal plate is formed.

2. The device of claim 1, wherein said pulp completely fills said gap between said first face of said card and said metal plate.

3. The device of claim 1, wherein said pulp comprises a mixture of silicone resin and at least one of 10-80 wt % of aluminum nitride and 50-80 wt % of hydrated aluminum oxide.

4. The device of claim 1, wherein a plurality of card are fixed to said metal plate via said pulp.

5. The device of claim 1, further comprising an enclosure for housing said integrated assembly and a thermal connector connecting said metal plate of said integrated assembly to said enclosure to allow heat flow from said metal plate to said enclosure.

6. The device of claim 2, wherein said metal plate is fixed within a groove formed in a wall of said enclosure to ensure thermal contact between said metal plate and said enclosure.

7. The device of claim 2, further comprising cooling means to convection cool said enclosure, said cooling means comprising a heat sink connected to said enclosure such that heat is transferred from said enclosure to said heat sink.