Mobile Device Case with Damping Protrusions for Impact Protection
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Solution Overview
Problem
Conventional mobile device cases made of thermoplastic polyurethane (TPU) lack effective impact protection as they do not dissipate impact energy well, transferring most of the impact energy to the device.
Innovation Solution
A mobile device case with a band surrounding the edge, featuring a flexible polymer layer and a softer damping material with integrally formed protrusions that absorb and dissipate impact energy, particularly at corner regions, combined with an optional hard outer shell for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a case is made of thermoplastic polyurethane (TPU) to provide good durability, then the case structure is maintained well, but impact protection is poor as most impact energy is transferred to the device
Solution Approach 1:
The case combines TPU (thermoplastic polyurethane) with a softer damping material layer. The TPU provides structural durability and shape maintenance, while the softer damping material absorbs and dissipates impact energy through its viscoelastic properties, preventing energy transfer to the device.
Solution Approach 2:
The damping material is strategically positioned in corner regions and along edges where impact is most likely to occur. This localized placement ensures that impact protection is concentrated where needed most, while maintaining overall case durability through the TPU structure.
2Object-affected harmful factors
If protrusions are provided in the damping material to engage with the device, then impact energy is dissipated away from the device, but contact area between band and device is reduced
Solution Approach 1:
The damping material is segmented into multiple discrete protrusions rather than forming a continuous layer. This segmentation allows the protrusions to contact the device at specific points during impact, concentrating energy dissipation at vulnerable regions like corners while minimizing overall contact area during normal use.
Solution Approach 2:
The protrusions are strategically positioned to provide localized contact at critical areas such as corners and edges. This ensures that impact energy is dissipated at the most vulnerable points while maintaining minimal contact area during normal device operation.
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
Significantly reduces energy transfer to the device by minimizing contact area and maximizing energy absorption, providing robust impact protection even when dropped from heights like 7 meters.
Implementation Method 1
a layer of a damping material which is softer than the flexible polymer provided within the flexible polymer layer
Implementation Method 2
the softer material with the protrusions further absorbs and dissipates the remaining energy of the impact away from the device
Implementation Method 3
The flexible polymer outer layer absorbs impact energy and holds the shape of the case
Data Source
AI summary
A method for manufacturing a case for a mobile device with a screen, includes using a band having a layer of flexible polymer as an insert mold or in a dual injection process, for applying discrete discontinuous and unconnected damping material on the layer of the flexible polymer of the band. The damping material is softer than the flexible polymer and has a plurality of integrally formed protrusions projecting inwardly from a substantial portion of the inner periphery of the band to engage with the mobile device. The protrusions are arranged such that, in use there is substantially no contact between the band and the device other than through the protrusions.