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Method for attaching a heatsink to a heat spreader

IP.com Disclosure Number: IPCOM000021645D
Publication Date: 2004-Jan-28
Document File: 4 page(s) / 142K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for attaching a heatsink to a heat spreader. Benefits include improved functionality and improved reliability.

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Method for attaching a heatsink to a heat spreader

Disclosed is a method for attaching a heatsink to a heat spreader. Benefits include improved functionality and improved reliability.

Background

A requirement exists for attaching a heatsink to an integrated heat spreader (IHS) without using any slots or holes on the motherboard to secure the heatsink. Conventional techniques to meet this requirement include the following (see Figure 1):

•         Using the motherboard holes or slots as retention features

•         Using a retention mechanism to secure the heatsink to the motherboard rather than to the heat spreader

•         Using adhesive to attach the heatsink to the heat spreader

•         Using a clip or retention device to secure the heatsink to the package

Description

The disclosed method includes a mechanical retention feature for attaching a heatsink to a heat spreader. A feature is added to the IHS and the heatsink base, securing the heatsink to the heat spreader by mechanical interference (see Figure 2).

No holes are drilled into the motherboard for securing the heatsinks. The heatsink is attached to the IHS directly, which secures the heatsink, limits board flexure, and improves solder joint reliability (see Figure 3).

The disclosed method includes a heat spreader with a slot for holding a heatsink (see Figure 4).

Tabs are added to the heatsink as integral parts, produced using an extrusion die, or attached separately by mechanical or chemical means, such as soldering, welding, or brazin...