Double-Decker Heatsink Coil Spring Mitigating EMI Leaks

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Solution Overview

Problem

Double-decker heatsinks face challenges in mitigating electromagnetic radiation leaks and compensating for manufacturing tolerance variations and warpage, leading to inefficient cooling and potential thermal bridges in multichip modules.

Innovation Solution

A double-decker heatsink design featuring a first heatsink coupled to a multichip module component, a second heatsink physically separated by a clearance, and a coil spring encompassing the second heatsink to prevent electromagnetic radiation leaks and align the heatsinks, ensuring proper thermal and physical contact despite manufacturing variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple heatsinks are combined into a double-decker heatsink to cool separate components at different temperatures, then cooling efficiency for multichip modules is improved, but electromagnetic radiation leaks occur through the gaps between heatsinks

Engineering Contradiction:

Improvecooling efficiencyVSAvoidelectromagnetic radiation leaks

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

A coil spring is introduced as an intermediary element between the first and second heatsinks. The coil spring fills the gap between heatsinks, serving as a mediator that blocks electromagnetic radiation from leaking through the clearance while allowing the heatsinks to maintain their separate positions for independent cooling of different components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If heatsinks are physically separated by clearance to prevent thermal bridges, then thermal management for different temperature requirements is improved, but electromagnetic radiation can leak through the clearance

Engineering Contradiction:

Improvetemperature controlVSAvoidelectromagnetic radiation leaks

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The coil spring acts as an intermediary substance placed within the clearance between heatsinks. It maintains the physical separation necessary for independent temperature control of different components while simultaneously blocking electromagnetic radiation from passing through the gap.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If a coil spring is used to prevent electromagnetic radiation leaks between heatsinks, then electromagnetic interference is reduced, but the device complexity increases

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The coil spring serves multiple functions simultaneously: it blocks electromagnetic radiation from leaking between heatsinks, compensates for manufacturing tolerance variations and warpage, and maintains the physical separation of heatsinks. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design effectively reduces electromagnetic interference, allows components to operate at different temperatures, and compensates for manufacturing tolerance and warpage, improving the performance and reliability of multichip modules by minimizing thermal bridges and ensuring efficient heat dissipation.

Implementation Method 1

a coil spring that (A) encompasses the second heatsink, (B) resides within the certain amount of clearance that separates the first and second heatsinks from one another, and (C) prevents at least some electromagnetic radiation from leaking via the certain amount of clearance

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

These heatsinks may include thermally conductive material that transfers heat away from the devices, thereby cooling the devices

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10304755B1Apparatus, system, and method for mitigating electromagnetic radiation leaks in double-decker heatsinks

Publication Date: 2019.05.28 JUNIPER NETWORKS INC

AI summary

The disclosed apparatus may include (1) a first heatsink that is coupled to a first component of a multichip module, (2) a second heatsink that is (A) coupled to a second component of the multichip module and (B) physically separated from the first heatsink by at least a certain amount of clearance, and (3) a coil spring that (A) encompasses the second heatsink, (B) resides within the certain amount of clearance that separates the first and second heatsinks from one another, and (C) prevents at least some electromagnetic radiation from leaking via the certain amount of clearance that separates the first and second heatsinks from one another. Various other apparatuses, systems, and methods are also disclosed.