Insulated Electromagnetic Shield for Hearing Aid Receiver
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Solution Overview
Problem
Hearing assistance devices face increased electromagnetic interference due to higher component densities and wireless communication capabilities, necessitating improved management of electromagnetic fields.
Innovation Solution
An insulated electromagnetic shield design using a high magnetic permeability material that is electrically insulated from the receiver casing, providing effective shielding while allowing mechanical vibrational dampening and reducing the size of the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If component density is increased to make hearing assistance devices smaller, then device size is reduced, but electromagnetic interference between components increases
Solution Approach 1:
An insulating material is introduced as an intermediary between the receiver and the electromagnetic shield. This insulator prevents direct electrical contact while allowing the shield to maintain its electromagnetic shielding function, thereby enabling close component placement without increasing interference
Solution Approach 2:
The electromagnetic shield is positioned to surround the receiver assembly, with the insulator nested between them. This nested configuration allows maximum spatial efficiency and minimal device size while maintaining electromagnetic isolation through the insulating layer
2Object-affected harmful factors
If electromagnetic shielding is enhanced to reduce interference, then electromagnetic shielding effectiveness is improved, but device size and assembly complexity increase
Solution Approach 1:
A thin insulating film or coating is applied between the receiver and shield, providing sufficient electrical isolation without requiring thick shielding materials. This thin-film approach maintains effective electromagnetic shielding while minimizing the volume occupied by the shield assembly
Solution Approach 2:
The insulator and shield are combined into a single integrated assembly that can be pre-formed or pre-assembled. This merging reduces the number of separate components and simplifies the overall assembly process, thereby reducing assembly complexity despite enhanced shielding
3Object-affected harmful factors
If electromagnetic shielding is enhanced to reduce interference, then electromagnetic shielding effectiveness is improved, but assembly complexity increases
Solution Approach 1:
The insulator is pre-applied to the receiver or pre-attached to the shield before final assembly. This preliminary action ensures proper positioning and electrical isolation is established before the shield is installed, simplifying the overall assembly process while maintaining effective shielding
Solution Approach 2:
The insulator serves as a simple intermediary component that facilitates assembly by providing built-in electrical isolation. This eliminates the need for complex wiring arrangements or additional isolation steps, thereby reducing assembly complexity while achieving effective electromagnetic shielding
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 insulated shield design achieves significant improvements in electromagnetic shielding, reducing interference and allowing for a smaller device design with reduced assembly complexity and closer component placement, demonstrating up to 18 dB improvement in shielding effectiveness.
Implementation Method 1
An insulated electromagnetic shield design using a high magnetic permeability material
Implementation Method 2
electrically insulated from the receiver casing
Data Source
Figure 1A~1E
Figure 2A~2C
Figure 3~4
AI summary
The present subject matter of the invention relates generally to the management of electromagnetic fields in hearing assistance devices, such as hearing aids, and in particular to an insulated electromagnetic shield design for hearing assistance devices. The present disclosure includes various embodiments for electromagnetic shielding of a receiver using a magnetic shield that is electrically insulated from the receiver casing and electronics.