Head-worn and Hand-held Device Motion Detection

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Solution Overview

Problem

Existing systems that detect the use of a hand-held device by a user wearing a head-worn device, such as those using image sensors, perform poorly in low light conditions.

Innovation Solution

A system comprising a head-worn device and a hand-held device that detects the use of the hand-held device by determining the relative motion between the two devices and adapting parameters of functions accordingly, enhancing detection speed and comfort.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If image sensors are used to detect device use, then detection can be performed, but performance deteriorates in low light situations

Engineering Contradiction:

Improvedetection performanceVSAvoidlow light conditions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces image sensor-based detection (optical system) with accelerometer-based detection (mechanical sensing system). The accelerometer detects motion patterns and relative movement between devices, eliminating dependence on light conditions while maintaining detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces motion data from accelerometers as an intermediary to detect device usage. Instead of directly observing visual information from image sensors, the system uses motion characteristics as a mediator to infer usage states, which works reliably regardless of lighting conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If relative motion detection is implemented, then detection speed improves, but system complexity increases

Engineering Contradiction:

Improvedetection speedVSAvoidsystem complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent leverages the accelerometer's existing functionality for motion detection and applies it to device usage detection. The same sensor that tracks device movement is also used to detect relative motion between devices, eliminating the need for separate detection hardware and reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines motion detection data from both devices to determine relative motion and usage state. By merging information from multiple sources (accelerometers in both devices), the system achieves fast detection while using existing components rather than adding complex new systems.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4542342A1System comprising a head-worn device and a hand-held device and configured to detect a use of the hand-held device by a user wearing the head-worn device

Publication Date: 2025.04.23 ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)

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AI summary

System and computer-implemented method for detecting a use of a hand-held device by a user wearing a head-worn device, the system comprises a head-worn device and a hand-held device, the system is configured to detect a use of the hand-held device by a user wearing the head-worn device. The system is also configured to determine a relative motion of one among the head-worn device and the hand-held device with respect to another among the head-worn device and the hand-held device and to detect, based on the relative motion, the use of the hand-held device by the user.