Perforated Metal Shield with Magnetic Layer for EMI and Heat

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Solution Overview

Problem

Hermetic metal outer shells in electronic devices effectively block electromagnetic interference but hinder heat dissipation, and adding heat dispersing holes compromises the shielding effect.

Innovation Solution

A perforated metal shell with a magnetic material layer, such as SmCo28 or NdFe35, is used to enhance electromagnetic shielding while allowing for heat dissipation through strategically placed holes, which are smaller than the wavelength of electromagnetic waves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If hermetic metal outer shells are used to block electromagnetic interference, then electromagnetic shielding is improved, but heat dissipation is hindered

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidheat dissipation

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent applies the porous materials principle by using a perforated metal shell with holes that are smaller than the wavelength of electromagnetic waves. These holes allow heat to pass through while blocking electromagnetic interference, effectively creating a structure that is porous to heat but impermeable to electromagnetic waves.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent applies the composite materials principle by combining the perforated metal shell with a magnetic material layer. This composite structure enhances electromagnetic shielding through the magnetic properties of the coating layer while the metal shell provides structural support and additional shielding, all while maintaining heat dissipation capabilities through the perforations.

Inventive Principle:

Principle #40Composite materials

2Temperature

If heat dispersing holes are added to hermetic shells, then heat dissipation is improved, but shielding effect is weakened

Engineering Contradiction:

Improveheat dissipationVSAvoidelectromagnetic shielding

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent resolves this contradiction by designing holes with specific dimensions smaller than the wavelength of electromagnetic waves. This allows the shell to be porous to heat (allowing heat dissipation) while remaining effective against electromagnetic interference, as the holes are too small to permit significant electromagnetic wave passage.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent applies parameter changes by optimizing the size, shape, and distribution of the holes in the metal shell. By carefully controlling these parameters, the design achieves optimal balance between heat dissipation efficiency and electromagnetic shielding effectiveness.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If magnetic material layer is added to enhance shielding, then electromagnetic shielding is improved, but device complexity increases

Engineering Contradiction:

Improveelectromagnetic shieldingVSAvoidshield structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining the perforated metal shell with a magnetic material layer. This layered composite structure enhances electromagnetic shielding effectiveness while maintaining relatively simple manufacturing processes and device architecture.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by applying the magnetic material layer specifically to the inner surface of the metal shell where it is most needed for shielding. This localized application optimizes shielding effectiveness while minimizing additional complexity and material usage.

Inventive Principle:

Principle #3Local quality

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

The solution effectively balances electromagnetic shielding and heat dissipation, improving the shielding effect by up to 1.43 dB compared to conventional shields without a magnetic material layer.

Implementation Method 1

a magnetic material layer 302 formed on the shell body 301... the magnetic material layer 302 is used for heat dispersing and further is used to weaken the electromagnetic wave produced by the electronic component 20, to enhance the electromagnetic shielding

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

The top surface 3011 defines a number of holes 3013 for heat dispersing... The magnetic material layer 302 formed on the top surface 3011 defines a number of through holes 3021 aligned with the holes 3013... the magnetic material layer 302 is used for heat dispersing

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS8963021B2Electromagnetic interference shield and electronic device using the same

Publication Date: 2015.02.24 CLOUD NETWORK TECH SINGAPORE PTE LTD

AI summary

An electromagnetic interference shield includes a shell body and a magnetic material layer formed on the shell body. A number of holes are defined in the shell body. A number of through holes are defined in the magnetic material layer aligned with the holes. An electronic device having the electromagnetic interference shield is also provided.