Flexible PCB Shielding for Hearing Aid EMI
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Solution Overview
Problem
Existing electronic circuits, such as those in hearing aids, face challenges in effectively shielding against electromagnetic interference (EMI) from various directions due to the complexity and limitations of current shielding methods, which are often not comprehensive and require additional components or complex production processes.
Innovation Solution
A flexible printed circuit board with integrated shielding areas that can be bent into specific configurations, such as T- or L-shapes, to provide comprehensive shielding in multiple directions, using a single conductive material for both metallization and shielding, and encasing electronic components within a shielded volume filled with epoxy resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the housing is provided with electromagnetic shielding coating or made of shielding material, then electromagnetic interference from outside the housing is reduced, but shielding effectiveness is compromised due to openings for microphone, receiver, and telecoil
Solution Approach 1:
The patent merges the shielding function with the circuit board by integrating a shielding layer directly into the circuit board structure. This allows the circuit board itself to provide shielding against electromagnetic interference from multiple directions, eliminating the need for separate housing shielding and accommodating openings for microphone, receiver, and telecoil without compromising shielding effectiveness.
Solution Approach 2:
The patent extends shielding from the traditional housing level to the circuit board level, adding a new dimension of shielding protection. The shielding layer is integrated at the circuit board level and can be configured to shield from multiple directions simultaneously, providing comprehensive EMI protection while maintaining access points for various components.
2Object-affected harmful factors
If separate shielding devices are added to shield the circuit, then electromagnetic interference protection is improved, but device complexity and production complexity increase
Solution Approach 1:
The patent combines the shielding function with the circuit board by integrating a shielding layer directly into the circuit board structure. This eliminates the need for separate shielding devices and reduces overall device complexity while maintaining effective electromagnetic interference protection.
Solution Approach 2:
The circuit board is designed to perform multiple functions: it serves as both the electrical circuit carrier and the electromagnetic shielding structure. The shielding layer integrated into the circuit board provides EMI protection while the board itself carries the electronic components and circuit traces, eliminating the need for separate shielding components.
3Object-affected harmful factors
If conventional shielding methods are used, then electromagnetic interference protection is provided, but production process complexity and manufacturing steps increase
Solution Approach 1:
The shielding layer is integrated directly into the circuit board manufacturing process, combining the shielding production with the circuit board production. This eliminates separate shielding manufacturing steps and simplifies the overall production process while providing effective electromagnetic interference protection.
Solution Approach 2:
The shielding layer is incorporated into the circuit board structure during the initial manufacturing process, so that shielding protection is already in place before the circuit board is assembled into the final device. This preliminary integration of shielding eliminates the need for additional shielding installation steps later in the production process.
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 approach allows for effective shielding against electromagnetic interference in multiple spatial directions without additional shielding devices, resulting in a simpler, more compact, and space-saving circuit design that is less complex to produce, ensuring reliable operation in diverse environments.
Implementation Method 1
A flexible printed circuit board (11) with integrated shielding (76) is proposed, which shields or at least reduces electromagnetic interference signals (EMI)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The board (11) has a carrier layer, metallization layers and shielding layers for shielding against electromagnetic parasitic induction, where the board is bendable in different bending regions (30-33) around each bending axis (35). The bending axes are located at an angle of 45 degrees from each other. The shielding layers extend over the bending regions. Electronic elements (4, 10) are supported in a circuit region (2, 3). The shielding layers extend over different printed circuit board regions (5-7), which are separated from each other. An independent claim is also included for a circuit fixed on a flexible printed circuit board.