Browse Prior Art Database

Heat Sink EMC Shield

IP.com Disclosure Number: IPCOM000123195D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Cooper, L: AUTHOR [+2]

Abstract

Disclosed is a device for suppressing and containing EMI (Electro Magnetic Interference) on a processor chip that uses a heat sink. The shield fits under the heat sink and makes grounding contact around the processor chip. This creates a grounded fence around the processor chip and allows emission to be contained and the processor chip to meet EMC (Electro Magnetic Compatibility) specifications while allowing the heat sink to contact and cool the component.

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Heat Sink EMC Shield

   Disclosed is a device for suppressing  and containing EMI
(Electro Magnetic Interference) on a processor chip that uses a heat
sink.  The shield fits under the heat sink and makes grounding
contact around the processor chip.  This creates a grounded fence
around the processor chip and allows emission to be contained and
the processor chip to meet EMC (Electro Magnetic Compatibility)
specifications while allowing the heat sink to contact and cool the
component.

   The Shield (Item 2) is made from thin, conductive spring
metal.  It is captured between the Heat Sink (Item 1) and the
Printed Circuit Board (Item 4).  The top of the shield makes contact
the heat sink, while eight spring-loaded, conductive legs (Item 3)
protrude down and make contact with matching grounding pads (Item 5),
located on the PC Board which holds the Processor Chip (Item 6).
Reference Figure 1.

   When captured and in place, the shield makes contact with
the heat sink and grounding pads on the PC board . This creates a
containment fence around the radiating component and suppresses
undesirable emissions and allows the component to meet EMC (Electro
Magnetic Compatibility) requirements while allowing the heat sink to
contact and cool the component.  Reference Figure 1 and Figure 2.
The disclosed shielding device is designed for ease of
manufacturability and assembly, and has proven to yield effective
EMC attenuation for PC boards where the processor chip is the
primary...