Wireless Infrared Tracking Device Using Distinct LED Patterns
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Solution Overview
Problem
Conventional Precision Position Tracking (PPT) devices used in immersive Virtual Reality systems are bulky and heavy, making them uncomfortable to wear for extended periods.
Innovation Solution
A lightweight and compact wireless PPT device utilizing two infrared Light-Emitting Diodes (LEDs) that emit distinct repetitive patterns of infrared light pulses, allowing for precise head movement tracking and orientation calculation, which can be integrated into headgear or attached to clothing, reducing form factor and weight while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PPT devices are used to ensure tracking functionality, then tracking precision is maintained, but device weight and bulk increase making them uncomfortable to wear
Solution Approach 1:
The patent extracts only the essential tracking components (two infrared LEDs) from the conventional PPT device, removing unnecessary bulk and weight while maintaining the core tracking functionality. The device is reduced to minimal components: a housing, two infrared LEDs with distinct signal patterns, and a power source, eliminating the need for complex mechanical structures.
Solution Approach 2:
The patent applies local quality by using two infrared LEDs with distinct signal patterns at different locations, allowing the system to determine both position and orientation. Each LED emits a unique repetitive pattern that can be distinguished by the tracking camera, enabling precise spatial tracking without requiring additional heavy components.
2Measurement precision
If conventional PPT devices are used to ensure tracking functionality, then tracking precision is maintained, but device complexity and bulk increase
Solution Approach 1:
The patent extracts only the essential tracking components (two infrared LEDs) from the conventional PPT device, removing unnecessary bulk and weight while maintaining the core tracking functionality. The device is reduced to minimal components: a housing, two infrared LEDs with distinct signal patterns, and a power source, eliminating the need for complex mechanical structures.
Solution Approach 2:
The two infrared LEDs serve multiple functions: they provide tracking signals, encode position information, encode orientation information, and enable identification of the device. The distinct repetitive patterns from the two LEDs allow the system to simultaneously determine both position and orientation without requiring separate sensors or complex mechanisms.
3Weight of moving object
If lightweight materials are used to reduce device weight, then comfort is improved, but device strength and durability may decrease
Solution Approach 1:
The patent segments the tracking device into minimal essential components: a lightweight housing, two infrared LEDs, and a power source. This segmentation allows each component to be optimized independently - the housing can be made from lightweight yet durable material, and the overall structure remains simple and robust despite the reduced weight.
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 comfortable and efficient tracking of user movements in real-time, supporting applications like virtual reality, augmented reality, and human behavior analysis with reduced power consumption and robust operation in noisy environments, offering improved user experience and accuracy.
Implementation Method 1
two or more infrared Light-Emitting Diodes (LEDs)
Implementation Method 2
emit a first repetitive pattern of infrared light pulses
Data Source
AI summary
Embodiment of a lightweight and compact wireless precision position tracking device and a precision position tracking motion capture system are described. Optionally, the wireless precision position tracking device is configured to be worn by a user. The wireless precision position tracking device may be configured to emit optical light from two or more respective markers, where the light from one of the markers is distinguishable from light from another of the markers.