In-Ear Hearing Charger Coil Layout for Inductive Alignment

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Solution Overview

Problem

Existing in-ear hearing devices face challenges in aligning receiver and transmitter coils for efficient inductive charging due to space constraints and alignment issues, which affect recharging efficiency and device design.

Innovation Solution

The receiver coil is positioned adjacent to a sidewall of the hearing device with its axial centreline pointing through, allowing for optimal alignment with the transmitter coil in the charger, which is also positioned adjacent to a holder sidewall, enabling efficient inductive coupling despite space limitations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the receiver coil is positioned inside the hearing device away from the sidewall, then the device can maintain a compact internal layout, but the alignment with the transmitter coil becomes difficult and charging efficiency decreases

Engineering Contradiction:

Improvecharging efficiencyVSAvoiddevice form factor

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The receiver coil is extracted from the traditional internal positioning and placed adjacent to the sidewall of the hearing device. This extraction allows the coil to be positioned where it can optimally align with the transmitter coil in the charger, significantly improving inductive coupling efficiency and charging performance.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The sidewall of the hearing device serves as an intermediary structure that facilitates the positioning of the receiver coil. By placing the coil adjacent to the sidewall rather than deep inside the device, the sidewall acts as a mediator that enables better alignment with the external transmitter coil while maintaining device compactness.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a battery door is added to the faceplate for battery replacement, then the battery can be replaced, but the design freedom and waterproof integrity of the device are significantly restricted

Engineering Contradiction:

Improvebattery replaceabilityVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The device employs wireless recharging through inductive coupling between the receiver coil in the device and the transmitter coil in the charger. This self-service charging mechanism eliminates the need for battery replacement by the user, removing the requirement for a battery door and its associated structural compromises.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mechanical battery replacement system (requiring a battery door and physical access) is replaced with an electromagnetic wireless charging system. This substitution uses inductive coupling through the sidewall instead of mechanical battery access, preserving device integrity and waterproofing while enabling convenient recharging.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If conductive contact points are used for charging, then the battery can be recharged, but additional components and electrical connections are required that complicate the device design

Engineering Contradiction:

Improvebattery recharging capabilityVSAvoidelectrical connection components

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The conductive electrical connection system for charging is replaced with an inductive wireless charging system. Instead of requiring physical contact points and electrical pathways through the device housing, the invention uses electromagnetic field coupling between coils, eliminating the need for additional conductive components and simplifying the overall device architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The sidewall of the hearing device functions as a flexible barrier that allows inductive charging without requiring physical penetration or additional conductive pathways. The coil positioned adjacent to the sidewall can couple with the external transmitter through the thin wall structure, enabling charging without compromising the device's sealed construction.

Inventive Principle:

Principle #30Flexible shells and thin films

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 configuration optimizes the charging process by reducing the device's form factor and simplifying the charger design, ensuring effective wireless charging without the need for additional components like a battery door or electrical connections.

Implementation Method 1

A fluctuating magnetic field created by an alternating current in a transmitter coil comprised in a charger induces an alternating electric current in a receiver coil comprised in the hearing device

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20260012044A1Wirelessly rechargeable in-ear hearing device and charger for same

Publication Date: 2026.01.08 GN HEARING AS

AI summary

The present disclosure relates to a wirelessly rechargeable in-ear hearing device, a charger for a wirelessly rechargeable in-ear hearing device, and a system comprising a wirelessly rechargeable in-ear hearing device and a charger for the wirelessly rechargeable in-ear hearing device.