Protector Cap for Thermal Interface Material Scratch Protection

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Solution Overview

Problem

Conventional electronic component packages face limitations in thermal insulation and reliability due to the vulnerability of thermal interface materials (TIMs) to mechanical damage such as scratching.

Innovation Solution

A package design featuring an electrically conductive carrier, an electronic component, an encapsulant, an electrically insulating and thermally conductive interface structure, and a protection cap that can be slid over the interface structure to provide temporary mechanical protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If thermal interface material is exposed for heat dissipation, then thermal conductivity is improved, but mechanical strength deteriorates due to susceptibility to scratching and damage

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidmechanical durability of interface structure

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The package structure is divided into functional zones: the interface structure for thermal conduction and the protection cap for mechanical protection. This segmentation allows each component to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protection cap acts as an intermediary element between the fragile interface structure and the external environment. It provides mechanical protection while allowing thermal energy to pass through to the heat dissipation body.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If protection cap is added to protect interface structure, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvepackage reliabilityVSAvoidpackage structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protection cap is designed as a simple, inexpensive component that can be easily added and removed. It serves its protective function during handling and transport, then can be discarded or set aside when no longer needed.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The protection cap employs a simple shell structure that provides adequate protection without adding significant complexity. The cap can be made from conventional materials using standard manufacturing processes.

Inventive Principle:

Principle #30Flexible shells and thin films

3Ease of operation

If protection cap is made removable for access, then ease of operation is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveaccess to interface structureVSAvoidcap fitting precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The protection cap is extracted as a separate, removable component rather than being integrated permanently into the package structure. This allows easy access to the interface structure while using simple tolerances for the cap itself.

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances the thermal and electrical reliability of the package by protecting the sensitive interface structure from mechanical damage while allowing for efficient heat removal through the thermally conductive interface.

Implementation Method 1

an electrically insulating and thermally conductive interface structure covering an exposed surface portion of the carrier

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

an electrically insulating and thermally conductive interface structure covering an exposed surface portion of the carrier

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Data Source

PatentUS12211761B2Protector cap for package with thermal interface material

Publication Date: 2025.01.28 INFINEON TECH AUSTRIA AG

AI summary

A method of manufacturing a package includes mounting an electronic component on an electrically conductive carrier, encapsulating part of the carrier and the electronic component by an encapsulant, covering an exposed surface portion of the carrier with an electrically insulating and thermally conductive interface structure, and covering at least part of the interface structure by a protection cap.