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Method for heatsink locking retention pins

IP.com Disclosure Number: IPCOM000130518D
Publication Date: 2005-Oct-25
Document File: 5 page(s) / 317K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for heatsink locking retention pins. Benefits include improved functionality and improved reliability.

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Method for heatsink locking retention pins

Disclosed is a method for heatsink locking retention pins. Benefits include improved functionality and improved reliability.

Background

              Conventionally, a heatsink for a high-performance CPU has a mass of 550 grams. The weight stresses the plastic retention fasteners used to hold the thermal solution to the printed circuit board (PCB) assembly and can cause failure. For example, a thermal solution has fasteners (a) that hold spring clips (b) to a circuit board (c, see Figure 1).

              The fasteners are assembled to the spring clip. Assembly of the thermal solution to the board is accomplished by pushing the fastener cap, which forces a center post downward. The plastic fastener tips splay, causing an interference fit between the fastener and mounting hole, locking the heatsink to the circuit board (see Figure 2).

               When the fastener fails, the retention tip breaks (see Figure 3).

General description

              The disclosed method is a locking retention pin for locking a heatsink to a PCB assembly. The pin is used in combination with a cut-out feature in the spring clip. The pin does not rely on a solder joint for holding strength but is shaped with a shoulder that holds it in place. Inserting the pins from below the board assembly provide a reliable preload between the heatsink and component and a stronger bond for withstanding shock and vibration.

              The key elements of the disclosed method include:

•             Locking pins

•             Heatsink spring clip

Advantages

              The disclosed method provides advantages, including:
•             Improved functionality due to pr...