Earpiece Capacitive Touch Interface for Interference Rejection

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Solution Overview

Problem

Conventional earpieces with capacitive sensing can misinterpret interference from wet hair or hats as user input, causing frustration.

Innovation Solution

Incorporating a secondary capacitive sensor orthogonally arranged to the primary capacitive sensor to detect interfering contacts and reject unintended inputs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a capacitive sensor is used to provide user interface control, then ease of operation is improved, but reliability deteriorates when wet hair or hats interfere with the sensor

Engineering Contradiction:

Improvecapacitive touch interface controlVSAvoidinput detection accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a second capacitive sensor arranged orthogonally to the first sensor, adding a spatial dimension to the detection system. This orthogonal arrangement allows the system to distinguish between touches on the front surface (intended inputs) and touches on the side (interference from hair or hats), thereby resolving the reliability issue while maintaining ease of operation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a secondary capacitive sensor is added to detect interfering contact, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveinput detection accuracyVSAvoidsensor configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The second capacitive sensor serves multiple functions: it detects interfering contacts from hair or hats, and also helps distinguish between intended and unintended touches. By making the sensor system multi-functional, the patent justifies the added complexity through enhanced reliability and user experience.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The controller acts as an intermediary that processes signals from both capacitive sensors and determines whether a touch is intentional or interference. This intermediary processing layer manages the complexity by providing a clear decision-making mechanism based on the combined sensor inputs.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Prevents misinterpretation of non-user inputs, enhancing user experience by accurately distinguishing between intended and unintended touches.

Implementation Method 1

Some conventional earpieces (e.g., in-ear headphones) utilize capacitive sensing to provide a user interface

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Data Source

PatentUS20250274693A1Earpieces with capacitive touch interfaces

Publication Date: 2025.08.28 BOSE CORP

AI summary

An earpiece includes a primary capacitive sensor, a secondary capacitive sensor that is arranged substantially orthogonally to the primary capacitive sensor, and a controller that is configured to receive input from the primary capacitive sensor to control one or more functions of the earpiece. The controller is further configured to receive input from the secondary capacitive sensor to detect if there is an interfering contact with the earpiece, and, if so, reject input from the capacitive touch interface.