Head-Mounted Device Drop Protection via Impact-Safe Mode
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Solution Overview
Problem
Electronic devices, such as head-mounted devices, are prone to damage from drop events and high-stress situations due to the risk of components like displays and optical assemblies being subjected to impact, which existing technologies have not adequately protected.
Innovation Solution
The implementation of actuators to adjust the spacing of optical assemblies, deployment of cushioning springs, adjustment of brakes and clutches, and activation of safety mechanisms upon detection of a drop event or power-down condition to move components to predetermined impact-safe positions, thereby reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical assemblies are made adjustable for different interpupillary distances, then adaptability is improved, but device complexity increases
Solution Approach 1:
The optical assemblies are made dynamically adjustable through actuators that can change the spacing between assemblies based on detected interpupillary distance, allowing the device to adapt to different users while managing complexity through automated control
2Reliability
If safety mechanisms are added to protect against drop events, then reliability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by detecting drop events through sensors and preemptively activating safety mechanisms such as brakes and cushioning springs before impact occurs, ensuring component protection while integrating these safety features into the existing device architecture
Solution Approach 2:
The safety system operates autonomously by using onboard sensors to detect drop conditions and automatically triggering protective mechanisms without user intervention, reducing the need for complex external control systems
3Object-affected harmful factors
If components are repositioned to impact-safe positions during drops, then damage resistance is improved, but response time is reduced
Solution Approach 1:
Components are repositioned to predetermined impact-safe positions as a preliminary action upon detection of drop conditions, moving them to protected locations before actual impact occurs to maximize damage resistance while minimizing the time components spend in vulnerable positions
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
Effectively protects sensitive components by positioning them in safe configurations during drops or power-downs, absorbing impact energy and preventing damage through strategic repositioning and mechanical adjustments, enhancing the durability of electronic devices.
Implementation Method 1
detection of a drop event using a sensor such as an accelerometer
Implementation Method 2
cushioning springs may be deployed
Data Source
AI summary
A head-mounted device may include optical assemblies for presenting images to a user. Actuators may be used to adjust the spacing between the optical assemblies to accommodate different interpupillary distances. Upon detection of a power-down event or drop event, the device may be placed into an impact-safe mode. During the safe mode, the optical assemblies may be moved to predetermined impact-safe positions, brakes such as optical guide rail brakes may be adjusted, cushioning springs may be deployed, clutches may be adjusted, and/or other safety mechanisms may be activated to help protect the optical assemblies or other sensitive components from damage.