Photosensor Lens Detection for AR Headsets
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Solution Overview
Problem
Augmented reality head-wearable devices with free-space projection optics require a combiner lens to redirect light beams towards the user's eye, but issues arise when the lens is not properly inserted, such as being broken or swapped, leading to discomfort due to projected light shining into the eyes of others.
Innovation Solution
A photosensor system with filters is integrated into the head-wearable device to detect the presence of the lens by comparing outputs from photosensors, enabling or disabling the projector based on the lens presence, using a projector controller to manage the light projection accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens is made swappable for different environments, then adaptability is improved, but the risk of lens being absent or improperly inserted increases
Solution Approach 1:
The system uses photosensors to continuously monitor the optical path and provide feedback about lens presence. The controller receives this feedback and automatically adjusts projector operation, enabling reliable detection and response to lens status changes without user intervention.
Solution Approach 2:
The patent replaces mechanical lens retention verification with an optical detection system. Instead of relying on mechanical indicators or manual checks, the system uses photosensors to detect the presence and optical properties of the lens, substituting physical verification with optical measurement.
2Productivity
If the projector is always enabled, then productivity is improved, but harmful effects increase when lens is absent
Solution Approach 1:
The controller continuously monitors photosensor signals and adjusts projector operation based on real-time lens presence detection. When the lens is properly detected, the projector operates at full productivity; when absent or improperly inserted, the system automatically disables or reduces projection, eliminating harmful stray light while maintaining maximum productivity when conditions are appropriate.
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 prevents discomfort by ensuring the projector is only enabled when the lens is present, maintaining proper light redirection and user safety.
Implementation Method 1
A photosensor system with filters is integrated into the head-wearable device to detect the presence of the lens by comparing outputs from photosensors
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture of a photosensor fusion system for lens detection are disclosed herein. An example apparatus includes a projector, a photosensor having a filter and a lens detector to compare an output from the photosensor to a threshold, and a projector controller to selectively enable or disable the projector based on the comparison between the output from the photosensor and the threshold.