Shielded Surface-Mounted Coil for Hearing Aids
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Solution Overview
Problem
Existing shielded coils for wireless applications in hearing aids are sensitive to electric field disturbances and not ideal for communication purposes, as they are either too large or complex to fabricate for small-sized consumer goods, and current shielding solutions are inefficient and space-consuming.
Innovation Solution
A surface-mounted coil antenna with a shielding layer comprising a flexible substrate or printed circuit board, featuring a conductive pattern that optimizes shielding by varying its width and positioning to minimize electric field interference, integrated into a compact ferrite core for efficient wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional shielded coil design is used, then shielding effect is provided, but the coil size becomes too large for hearing aid integration
Solution Approach 1:
The patent applies a thin flexible shielding layer made of conductive material deposited on a dielectric substrate. This thin film structure provides effective electromagnetic shielding while maintaining a compact coil size suitable for hearing aid integration, directly resolving the contradiction between shielding effectiveness and size constraints.
Solution Approach 2:
The shielding is implemented as a layered structure with the conductive pattern deposited on the surface of the dielectric substrate, creating a two-dimensional shielding plane that effectively blocks electromagnetic interference without adding significant volume to the coil assembly.
2Object-affected harmful factors
If a traditional shielded coil design is used, then shielding effect is provided, but the fabrication process becomes too complex
Solution Approach 1:
The shielding layer is integrated directly into the coil structure during the manufacturing process, combining the shielding function with the coil assembly. This merging of functions eliminates the need for separate shielding components and simplifies the overall fabrication process.
Solution Approach 2:
The patent replaces complex mechanical shielding structures with a deposited conductive layer on a dielectric substrate. This substitution of material deposition for mechanical assembly significantly reduces fabrication complexity while maintaining shielding effectiveness.
3Reliability
If shielding is added to protect against electric field disturbances, then communication reliability improves, but the space available in hearing aids is further reduced
Solution Approach 1:
A thin flexible dielectric substrate with deposited conductive shielding layer is used, providing effective electric field protection while occupying minimal space. This thin film approach ensures communication reliability without compromising the compact dimensions required for hearing aid integration.
Solution Approach 2:
The shielding is implemented as a surface layer on the dielectric substrate, utilizing the two-dimensional plane rather than adding volumetric depth. This dimensional approach provides comprehensive shielding while maintaining a compact overall size suitable for hearing aid constraints.
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 solution significantly improves production efficiency and reduces failure rates while providing effective shielding against electric fields, enabling reliable wireless communication in small devices like hearing aids without increasing size or complexity.
Implementation Method 1
a shielding layer provided between mounting sections thereby covering said windings, said shielding layer comprising a shielding pattern and a contact section for connecting to a reference level and to said shielding pattern
Implementation Method 2
A surface mounted coil antenna for wireless communication, and comprising a wire wounded about a core thereby establishing a plurality of windings
Data Source
AI summary
The present invention relates to a surface mounted coil (200) for wireless communication. The coil (200) comprises a wire (202) wounded about a core (204) thereby establishing a plurality of windings and having its ends terminated on mounting sections (208) at each end of the core (204). The coil (200) further comprises a shielding layer (212, 300) wound about a central part of the core (204) thereby covering said windings. The shielding layer (212, 300) comprises a shielding pattern and a contact section (214) for connecting to a ground level and to the shielding pattern.