Hall Sensor Array for VR Headset Angle Detection
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Solution Overview
Problem
Virtual reality (VR) headsets lack an effective method to detect when they are being removed or placed on a user's head, which is crucial for managing head-worn device states and updating the virtual environment accordingly.
Innovation Solution
An angular detection system using a magnet and multiple sensors, where the magnet generates magnetic flux lines and the sensors, spatially separated along its motion path, detect the strength of these lines to determine the magnet's location and calculate the angle of rotation, utilizing a polynomial function or look-up table to correlate voltage signals with the angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection methods are used in VR headsets, then the device structure remains simple, but the ability to detect head-worn device states (placement/removal) is insufficient
Solution Approach 1:
The detection system is segmented into multiple independent Hall effect sensors positioned at different locations, each detecting magnetic field strength at its specific position. This segmentation allows the system to determine angular position through spatial distribution of sensor readings rather than using a single complex sensor.
Solution Approach 2:
The patent replaces mechanical switches or complex mechanical detection mechanisms with magnetic field-based Hall effect sensors. This substitution eliminates moving parts and mechanical wear while enabling contactless detection of device states through magnetic field strength measurements.
2Measurement precision
If multiple sensors are used to detect magnetic flux lines, then the angle of rotation can be determined accurately, but the device complexity increases
Solution Approach 1:
The patent transitions from single-dimension detection to two-dimensional spatial detection by arranging multiple sensors in a specific geometric pattern. The angular position is determined by analyzing the spatial distribution of magnetic field strengths across multiple sensor positions, effectively using spatial dimensionality to encode angular information.
Solution Approach 2:
The same array of Hall effect sensors serves multiple functions: detecting device placement/removal states, determining angular rotation position, and potentially tracking linear displacement. This multi-functionality reduces the need for separate detection systems for different measurement types.
3Measurement precision
If a polynomial function or look-up table is used to correlate voltage signals with angle, then the angle calculation becomes more accurate, but the processing complexity increases
Solution Approach 1:
The patent pre-calculates and stores the relationship between sensor voltage signals and angular positions in a look-up table during the device manufacturing or initialization phase. This preliminary action allows the system to perform simple table lookups during operation rather than performing complex real-time polynomial calculations, significantly reducing processing complexity while maintaining high accuracy.
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
Enables the VR headset to accurately detect its position and orientation, allowing for seamless transitions between states, such as turning components on or off, and determining user head size, thereby enhancing the VR experience.
Implementation Method 1
The magnet can generate a plurality of magnetic flux lines
Implementation Method 2
The plurality of sensors can be located and spatially separated along the motion path of the magnet for detecting the magnetic flux densities
Data Source
AI summary
An angular detection system including a magnet and sensors is disclosed. The magnet can be located on a rotating component and the sensors can be located on a stationary component, or vice versa. The magnet can generate a plurality of magnetic flux lines. The plurality of sensors can be located and spatially separated along the motion path of the magnet for detecting the magnetic flux densities. The strength of the magnetic flux lines sensed by a given sensor can be used to determine the location of the magnet along its motion path. The plurality of sensors can generate one or more signals indicative of the strength of the sensed magnetic field lines. Based on the strength of the magnetic flux lines, the location of the magnet, or both, the system can determine the angle of rotation of the device by using a polynomial function or a look-up table.