Optical Sensor Ear Proximity Detection for Hearing Device Power Control

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Solution Overview

Problem

Conventional hearing devices require manual activation to turn off, leading to potential contaminant ingress and reduced reliability, while existing automatic On/Off features using motion sensors are inefficient and prone to false triggers.

Innovation Solution

Incorporating an optical sensor in the connector of a receiver-in-canal (RIC) hearing device cable assembly to generate a proximity signal based on skin proximity, allowing the controller to automatically switch between nominal and low power modes, and interpret user movements as control inputs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual activation is used to turn off the hearing device, then the device can be controlled by the user, but contaminant ingress risk increases and reliability decreases

Engineering Contradiction:

Improvedevice reliabilityVSAvoidcontaminant ingress risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The hearing device automatically detects when it is removed from the user's ear through the optical sensor and autonomously powers down without requiring manual user action. This self-service mechanism eliminates the need for users to manually activate shutdown, thereby reducing contaminant ingress risk while maintaining reliability.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical button activation with an optical sensing system that detects ear proximity and automatically controls power mode transitions. This substitution eliminates physical contact points that could allow contaminant ingress while maintaining reliable device control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Extent of automation

If motion sensors are used for automatic On/Off features, then automation is achieved, but false triggers occur and efficiency is reduced

Engineering Contradiction:

Improveautomatic On/Off capabilityVSAvoidfalse trigger rate

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The patent replaces motion sensing with optical proximity sensing to detect whether the hearing device is on the user's ear. This optical detection method is more reliable than motion sensors, as it specifically detects the presence of the ear rather than responding to general movements, thereby eliminating false triggers while maintaining automation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses different threshold parameters for optical sensor detection to distinguish between intentional placement on the ear and incidental proximity. By adjusting the proximity threshold parameters, the system achieves reliable automatic On/Off functionality without false triggers from minor movements or environmental factors.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the optical sensor continuously monitors proximity, then accurate ear detection is achieved, but power consumption increases

Engineering Contradiction:

Improveear proximity detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The optical sensor operates periodically rather than continuously, checking proximity at specific intervals or when wake events occur. This periodic operation maintains accurate ear detection capability while significantly reducing power consumption compared to continuous monitoring, as the sensor remains dormant between measurement cycles.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts the optical sensor's operational state based on device mode and user interaction history. The sensor becomes more active when the device is newly powered on or after periods of inactivity, and reduces monitoring intensity during stable operating conditions, optimizing the balance between detection accuracy and power consumption.

Inventive Principle:

Principle #15Dynamics

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

The optical sensor-based automatic On/Off feature enhances battery life and reduces contaminant risk by accurately detecting ear proximity, while user-controlled inputs enable intuitive device operation without manual buttons.

Implementation Method 1

An optical sensor is disposed in the connector and configured to generate a proximity signal based on proximity of the optical sensor to skin at or near the user's ear

Methodology Applied

Scientific EffectOptical sensing: Photoelectric Effect

Data Source

PatentUS20250193572A1Ear-wearable electronic device including receiver cable with an optical sensor

Publication Date: 2025.06.12 STARKEY LABORATORIES INC

AI summary

A receiver-in-canal (RIC) hearing device comprises a housing configured for deployment behind an ear of a user of the hearing device. A power source, audio components, a communication device, and a controller are respectively disposed in the housing. A cable assembly comprises a cable, a receiver disposed at a distal end of the cable, and a connector disposed at a proximal end of the cable and configured to attach to the housing. An optical sensor is disposed in the connector and configured to generate a proximity signal based on proximity of the optical sensor to skin at or near the user's ear. The controller is configured to operate the hearing device in a nominal power mode in response to the proximity signal exceeding a threshold and to operate the hearing device in a low power mode in response to the proximity signal falling below the threshold.