Shielding and cooling arrangement

• US 5,541,811 A
• Filed: 04/06/1995
• Issued: 07/30/1996
• Est. Priority Date: 04/11/1994
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Henningsson, Bo U. E., Arvidsson, Stig A.
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US08/417,905
• Time in Patent Office: 481 Days
• Field of Search: 165/80.2, 165/80.3, 165/185, 174/16.3, 174/35 R, 257/718-719, 257/726-727, 439/70-73, 361/690, 361/688, 361/704, 361/707-711, 361/714-722, 361/760, 361/783, 361/816, 361/818, 361/820
• US Class Current: 361/704
• CPC Class Codes: H01L 23/4093 Snap-on arrangements, e.g. clips
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves
• CPC Class Codes: H01L 23/585 comprising conductive layers or plates or strips or rods or rings H01L23/60, H01L23/62, H01L23/64, H01L23/66 take precedence
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: Y10S 174/35 Box or housing mounted on substrate or PCB

Abstract

An arrangement for shielding and/or cooling electronic components mounted on a circuit board includes a generally planar shielding hood and cooling elements. The shielding hood has downward extending side edges that extend around the perimeter and are intended to surround the component. Each cooling element has a generally planar underside and cooling fins disposed on the upper side. The arrangement also includes hook fasteners mounted on the surface of the circuit board and holders mounted on the cooling elements that coact with the hook fasteners. The hook fasteners press the cooling elements resiliently against the shielding hood and against the component. The holders can be brought into resilient, spring engagement with the hook fasteners. The shielding hood is adapted to the component, and when the component is to be shielded, the shielding hood is placed over the component. The cooling element is also adapted to the component, and when the component is to be cooled, the cooling element is placed either on the component or on the shielding hood over the component.

Claims

1. An arrangement for mounting an electronic component on a circuit board, the arrangement comprising:

a generally planar shielding hood having side edges that extend downward around a perimeter of the hood for enclosing a component, wherein the shielding hood is placed over the component to shield the component;

a cooling element having a generally planar underside and cooling fins disposed on an upper side, wherein the cooling element is placed above the component to cool the component; and

means for resiliently attaching the cooling element to a surface of the circuit board, wherein the attaching means includes hooks mounted on the surface of the circuit board and holder means, mounted on the cooling element, for coacting with the hooks, wherein the holder means can be brought into resilient engagement with the hooks.

2. The arrangement of claim 1, wherein the shielding hood is a substantially rigid frame having a central thinner part that is adapted to the component and that is in a form of a diaphragm that is movable in relation to a remainder of the shielding hood for causing the component and the cooling element to abut and to ensure good heat transfer between the component and the cooling element.

3. The arrangement of claim 2, wherein the underside of the cooling element has an outwardly projecting part that corresponds in shape to the central thinner part of the shielding hood.

4. The arrangement of claim 1, wherein the shielding hood has a regular pattern of penetrating openings that permit the hooks on the circuit board to extend upward through the openings.

5. The arrangement of claim 4, wherein the shielding hood is placed over a plurality of components, a respective cooling element is placed over each heat-emitting component that requires cooling, said attaching means are provided at each heat-emitting component, and each cooling element is secured by said holder means in engagement with the hooks extending through the openings in the shielding hood.

6. The arrangement of claim 1, wherein the holder means are intended to be clamped in grooves provided in the cooling element or between the cooling fins of the cooling element.

7. The arrangement of claim 1, wherein said attaching means are placed in each corner of the cooling element.