Electroactive Perimeter Stiffener for Mobile Device Impact Protection
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Solution Overview
Problem
Mobile computing devices, particularly those that are smaller, thinner, and lighter, face challenges in protecting sensitive components like display screens from impact damage due to limited space for structurally stiff perimeter components and energy-absorbing materials.
Innovation Solution
The implementation of an electroactive structure around the perimeter of mobile computing devices that selectively stiffens in response to a detected free-fall event, directing impact energy away from sensitive components using a free-fall sensor and power supply, and optionally connecting to an energy-absorbing structure to dissipate the energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If structurally stiff perimeter components and energy-absorbing components are incorporated to protect sensitive components from impact, then protection effectiveness is improved, but device size, weight, and thickness increase
Solution Approach 1:
The patent applies dynamics by using electroactive polymers that can dynamically change their mechanical properties from flexible to stiff on demand. The perimeter components remain flexible during normal operation to maintain device thinness and lightness, then actively stiffen when impact is detected, providing protection without the permanent weight and bulk of traditional stiff structures.
Solution Approach 2:
The invention utilizes parameter changes by altering the mechanical stiffness parameter of the perimeter components through electrical activation. The electroactive polymers change their modulus of elasticity from a low state during normal use to a high state during impact events, enabling the same component to serve both as a flexible structural element and an impact-resistant barrier.
2Strength
If structurally stiff perimeter components are used to direct impact energy away from sensitive components, then impact energy direction capability is improved, but device thickness increases
Solution Approach 1:
The electroactive polymers enable dynamic thickness management by remaining thin and flexible during normal operation, then expanding and stiffening only when impact is detected. This eliminates the need for permanently thick protective structures, as the protection mechanism activates only when needed.
Solution Approach 2:
The system performs preliminary action by detecting the impact event and activating the electroactive polymers before the actual impact occurs. This allows the perimeter components to be in their protective stiff state during the critical moment of impact, directing energy away from sensitive components effectively.
3Reliability
If traditional stiff perimeter components are incorporated to protect corners and edges, then corner protection is improved, but available space for other components decreases
Solution Approach 1:
The electroactive polymers provide dynamic corner protection that adapts to space constraints. During normal operation, the perimeter components remain flexible and thin, maximizing internal space for other components. When impact is detected, they actively stiffen to provide corner protection, eliminating the need for permanently bulky protective structures.
Solution Approach 2:
The invention changes the physical parameters of the perimeter materials from flexible to stiff on demand, allowing the same material to provide both space efficiency and protection. The electroactive polymers maintain a compact, space-efficient form during normal use, then expand to provide protective stiffness at corners and edges when needed.
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 solution effectively reduces damage to impact-sensitive components by actively stiffening the perimeter to redirect and dissipate impact energy, enhancing the protection of mobile devices during falls and impacts without the need for bulky structural components.
Implementation Method 1
an electroactive structure oriented about a perimeter of the mobile computing device to selectively stiffen in response to a signal from the free-fall sensor
Data Source
AI summary
As mobile computing devices are increasingly expected to be smaller, thinner, and/or lighter, less space is available for incorporating such structurally stiff perimeter components, as well as energy-absorbing components. The electroactive perimeter stiffening devices, systems, and methods described herein detect a free-fall event or condition, anticipate a subsequent impact event, and actively stiffen one or more electroactive perimeter stiffeners of an associated mobile computing device in preparation for the impact event. The electroactive perimeter stiffeners direct impact energy away from, and in some cases, distribute and/or dissipate the impact energy, in an effort to prevent damage to impact-sensitive components of the mobile computing device.