Wearable Position Tracking via Body Interaction Sensors

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Solution Overview

Problem

Traditional artificial reality systems face challenges in accurately determining the position and orientation of wearable devices on a user's body, leading to imprecise interactions and a less immersive experience.

Innovation Solution

Incorporating sensors and processing devices into wearables that detect physical interactions with the user's body, such as strain gauges and visual tracking aids, to determine changes in position and orientation, and communicate this information to the artificial reality system for precise tracking and interaction detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional image analysis methods are used to estimate wearable device position, then the system complexity remains low, but the measurement precision deteriorates

Engineering Contradiction:
Improvewearable device position determination accuracyVSAvoidsystem complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces traditional optical/image analysis methods with inertial sensing technology. The wearable device incorporates inertial sensors (accelerometers, gyroscopes) that directly measure physical motion and orientation, substituting the complex image capture and processing system with compact mechanical/electrical sensors that provide precise position data without requiring external cameras or complex visual processing.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary processing system that receives raw sensor data from the wearable device and computes position information. This intermediary layer (including processor, memory, and algorithms) mediates between the simple sensor measurements and the final position determination, enabling accurate tracking while keeping the wearable itself relatively simple.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If no position tracking is implemented, then the device complexity remains minimal, but the reliability of artificial reality experience deteriorates

Engineering Contradiction:
Improveartificial reality experience qualityVSAvoidwearable device complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements preliminary calibration and setup procedures that establish the initial position and orientation of the wearable device on the user's body. This preliminary action creates a reference frame that enables reliable tracking throughout the artificial reality experience, ensuring consistent and accurate position determination without requiring complex continuous adjustments.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements continuous feedback loops where sensor data is constantly processed and used to update the virtual environment rendering. This feedback mechanism ensures that the artificial reality experience remains reliable and synchronized with the user's actual movements, with the system automatically correcting for drift or position changes in real-time.

Inventive Principle:
Principle #23Feedback

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 enables more accurate tracking of wearable devices, allowing for improved interaction detection and a more immersive artificial reality experience by ensuring virtual content is aligned correctly with the user's movements and body position.

Implementation Method 1

The sensor may include and/or represent a strain gauge whose electrical resistance is commensurate with an amount of force applied to the strain gauge

Methodology Applied
Scientific EffectStrain gauge electrical resistance change: Electrical Resistance

Data Source

PatentUS11287885B1Apparatus, system, and method for determining the position of wearables donned by users of artificial reality systems
Publication Date: 2022.03.29 META PLATFORMS INC
  • US11287885B1 patent drawing
  • US11287885B1 patent drawing
  • US11287885B1 patent drawing

AI summary

An apparatus for determining the position of artificial reality wearables may include a wearable dimensioned to be donned by a user of an artificial reality system. The apparatus may also include a sensor incorporated into the wearable. The sensor may detect physical interactions between the wearable and at least one specific body part of the user. The apparatus may further include a processing device communicatively coupled to the sensor. The processing device may determine, based at least in part on one or more physical interactions between the wearable and the specific body part of the user, a change in a position of the wearable relative to the specific body part of the user. Various other apparatuses, systems, and methods are also disclosed.