Protective Case Impact Geometry for Thin Shock Absorption
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Solution Overview
Problem
Conventional mobile device cases that provide impact protection often increase the thickness and weight of the device, compromising aesthetics and usability.
Innovation Solution
A protective case design featuring a rigid molded shell, an impact absorbent perimeter portion, and an elastomeric interior core with impact geometry, including gaps and ridges that deflect on impact, to absorb and distribute force efficiently while minimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impact protection materials are used, then shock protection is improved, but thickness and weight increase
Solution Approach 1:
The case is divided into three distinct segments: a rigid molded shell providing structural integrity, an impact absorbent perimeter portion for edge protection, and an elastomeric interior core with impact geometry for shock absorption. This segmentation allows each component to be optimized for its specific function while collectively providing comprehensive protection without excessive weight or thickness.
Solution Approach 2:
The case employs composite construction combining rigid materials (for the shell), elastomeric materials (for the interior core), and impact absorbent materials (for the perimeter portion). This multi-material approach enables the case to provide both structural strength and impact absorption capabilities while maintaining a compact and lightweight design.
2Reliability
If conventional impact protection materials are used, then shock protection is improved, but case thickness increases
Solution Approach 1:
The elastomeric interior core features localized impact geometry with raised ridges and recessed gaps distributed across its surface. This local quality variation allows the core to provide enhanced shock absorption at impact points while maintaining overall thinness. The ridges are strategically positioned to deflect into the gaps during impact, creating a cushioning effect without requiring increased thickness.
Solution Approach 2:
The impact geometry in the elastomeric core introduces a third dimension of protection through raised and recessed features. Rather than simply increasing thickness, the design uses surface-level geometric variations to create energy-absorbing structures that deflect impact forces, providing enhanced protection within the same thickness envelope.
3Strength
If more material is used for protection, then impact resistance is improved, but weight increases
Solution Approach 1:
The elastomeric interior core utilizes parameter changes in material properties, transitioning from a solid uniform structure to one with varying density and geometry. The raised ridges and recessed gaps create regions of different stiffness and energy absorption characteristics, allowing the material to optimize its protective performance without increasing overall quantity or weight.
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 design offers enhanced shock protection with reduced thickness and weight, providing dual-layer protection, improved grip, and energy absorption, making it lighter and more resistant to impacts without compromising the device's original feel and look.
Implementation Method 1
ridges configured to deflect into the gaps on impact
Implementation Method 2
impact geometry including gaps and ridges, the ridges being configured to deflect into the gaps on impact
Implementation Method 3
an elastomeric interior core
Implementation Method 4
a rigid molded shell
Data Source
AI summary
A case for an electronic device comprising a frame or shell, a protective perimeter, and an interior with impact geometry.