Three-Layer Mobile Device Case with Hard Dissipation Core

Solution Overview

Problem

Existing mobile device cases with hard outer layers face issues of scratch vulnerability and energy transmission to the device, while soft outer materials compromise impact protection, and thick cases are undesirable for aesthetics and RF performance.

Innovation Solution

A three-layer case structure with a flexible polymer outer layer, a dissipation material intermediate layer, and a soft damping material inner layer, where the dissipation layer is the hardest and most protected, dispersing impact forces and reducing localized stress on the damping material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hard outer layer is used to disperse impact, then impact protection is improved, but the outer layer becomes prone to scratches and cracks

Engineering Contradiction:

Improveimpact protectionVSAvoidscratch resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The case uses a composite structure with three layers: a soft flexible polymer outer layer (90A-100A Shore Durometer) that resists scratches, a hard dissipation material intermediate layer (60D-100D Shore Durometer) that disperses impact, and a soft damping material inner layer (30A-60A Shore Durometer) that absorbs energy. This composite arrangement allows each layer to perform its specific function without compromising the others.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The hard dissipation material is positioned as an intermediate layer between the soft outer layer and soft inner layer. This intermediary hard layer disperses impact forces before they reach the device, while being protected from direct contact with external objects by the softer outer layer, thus preventing scratches and cracks.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If a soft outer material is used to absorb impact energy, then impact protection is improved, but the hard inner material transmits impact to the device and may scratch it

Engineering Contradiction:

Improveimpact absorptionVSAvoiddevice scratch risk

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The case uses a composite structure with three layers: a soft flexible polymer outer layer (90A-100A Shore Durometer) that resists scratches, a hard dissipation material intermediate layer (60D-100D Shore Durometer) that disperses impact, and a soft damping material inner layer (30A-60A Shore Durometer) that absorbs energy. This composite arrangement allows each layer to perform its specific function without compromising the others.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The hard dissipation material is positioned as an intermediate layer between the soft outer layer and soft inner layer. This intermediary hard layer disperses impact forces before they reach the device, while being protected from direct contact with external objects by the softer outer layer, thus preventing scratches and cracks.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the thickness of layers is increased to enhance impact protection, then impact absorption is improved, but the case becomes thicker and heavier

Engineering Contradiction:

Improveimpact protectionVSAvoidcase weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The case uses a composite structure with three layers: a soft flexible polymer outer layer (90A-100A Shore Durometer), a hard dissipation material intermediate layer (60D-100D Shore Durometer), and a soft damping material inner layer (30A-60A Shore Durometer). Each layer is optimized for its specific function, allowing effective impact protection with minimal overall thickness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different regions of the case have different material compositions optimized for local requirements. The three-layer structure is positioned to provide maximum protection in impact-prone areas while maintaining minimal thickness overall. The hard dissipation layer is strategically placed to maximize impact dispersion efficiency.

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

This configuration provides enhanced impact protection, protects the device from scratches, maintains case rigidity, and maintains a thin, lightweight design, ensuring both effective impact absorption and aesthetic appeal.

Implementation Method 1

an outer layer of a flexible polymer... the outer layer with its intermediate hardness will absorb and disperse some of the impact

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

an intermediate layer of a dissipation material between the inner and outer layers... the impact is spread across a wide portion of the band thereby reducing the localised force

Methodology Applied

Scientific EffectRigid material resistance:

Implementation Method 3

an inner layer of damping material... the inner layer provides cushioning for the device itself ensuring that it does not get scratched

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Data Source

PatentUS10542803B2Case for a mobile device

Publication Date: 2020.01.28 TECH 21 LICENSING LTD

AI summary

A case for a mobile device with a screen. The case comprises a band arranged to surround the edge of the device. The band comprises an outer layer of a flexible polymer, an inner layer of damping material and an intermediate layer of a dissipation material between the inner and outer layers. The intermediate layer is the hardest of three layers and the inner layer is the softest.