Folded Flexible PCB Shielding for Hearing Aid Interference
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Solution Overview
Problem
Hearing aid devices face issues with unwanted magnetic influences and noise from components like telecoils and oscillators, which cause electromagnetic interference, and existing shielding solutions are either inflexible or ineffective in reducing such interference.
Innovation Solution
A shielding device composed of three sections that can be folded around a central section, using continuous bands with insulating layers and made of metal or metal alloys to provide effective shielding against magnetic, electrical, and electromagnetic interference, while allowing flexibility and rigidity control through varying insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic shielding is provided using traditional rigid structures, then shielding effectiveness is improved, but device flexibility and ease of integration deteriorate
Solution Approach 1:
The patent employs flexible printed circuit board (FPC) as the shielding structure instead of traditional rigid metal enclosures. The FPC can be folded and bent to conform to the hearing aid housing, providing effective electromagnetic shielding while maintaining device flexibility and ease of integration. The continuous metallic layers on the FPC create Faraday cage effects to block electromagnetic interference.
Solution Approach 2:
The shielding device is integrated within the hearing aid housing structure, with the FPC folded to fit inside the available space. The shielding layers are nested around the sensitive electronic components (microphones, oscillators, telecoil), creating a compact nested arrangement that provides shielding without adding external bulk.
2Object-affected harmful factors
If multiple continuous bands are used to form sections with insulating layers, then shielding effectiveness is improved, but device complexity increases
Solution Approach 1:
The FPC is divided into multiple continuous metallic bands or traces that are arranged in specific patterns to form shielding sections. These segmented metallic paths are separated by insulating regions on the FPC substrate. The segmentation allows the shielding structure to be folded into three-dimensional configurations while maintaining electrical continuity for electromagnetic blocking.
Solution Approach 2:
The shielding device utilizes composite construction combining metallic conductive layers (for electromagnetic shielding) with dielectric insulating layers (integrated into the FPC substrate). This composite structure provides both shielding functionality and structural integrity, allowing the device to block magnetic and electromagnetic interference while maintaining flexibility.
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 shielding device effectively reduces external interference for internal components and prevents the components from causing noise, offering a flexible and cost-effective solution for hearing aid devices.
Implementation Method 1
shielding device for a hearing aid, which can be folded around a first section, wherein the first section can be populated with at least one SMD component or integrated circuit, so that the shielding device shields the at least one component or integrated circuit from external interference and shields the at least one component or integrated circuit from the outside in
Implementation Method 2
In the case of multiple bands, an insulating layer or dielectric layer is arranged between each band
Data Source
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Figure 2~3
AI summary
The invention relates to a shielding device for a hearing aid and a hearing aid with such a device. The object of the invention is to provide a shielding device for a hearing aid which can shield components against external interference and vice versa. This object is achieved with a shielding device according to the invention for a hearing aid, wherein the shielding device has at least three sections, each of which is connected to one another via a flexible connecting section, wherein at least one first section is provided with a printed circuit board and can be fitted with at least one component and/or an integrated circuit, and wherein the two other sections can be folded around the first section by means of the flexible connecting sections in order to shield the first section.