Low-radiation electromagnetic earpiece with twisted internal connection lines
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Solution Overview
Problem
Electromagnetic leakage fields from earpieces in miniaturized hearing aid devices interfere with other components, preventing optimal signal reception and amplification due to incomplete shielding.
Innovation Solution
The internal connection lines in the earpiece are routed in close proximity and twisted over a significant length to compensate each other's magnetic fields, reducing parasitic leakage fields by utilizing the principle of a 'double conductor' and maintaining proximity even with mechanical agitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If internal connection lines are kept short to reduce leakage fields, then the leakage field reduction is limited, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The connection line routing is divided into two distinct segments: a first segment extending from the coil end to the housing, and a second segment extending from the housing to the electrical connection. This segmentation allows each segment to be optimized independently for minimizing leakage fields while maintaining manufacturability.
Solution Approach 2:
The connection lines are routed in close proximity to each other specifically in regions where they carry return currents, creating local current loops with small areas. This local optimization of the routing geometry reduces parasitic magnetic fields without requiring complete redesign of the entire connection path.
2Object-generated harmful factors
If shielding plates are added to reduce leakage fields, then electromagnetic shielding improves, but the device complexity and space requirements increase
Solution Approach 1:
The invention converts the potentially harmful long connection lines into a beneficial configuration by routing them in close proximity to form tight current loops. The return current in the second connection line generates a magnetic field that opposes and cancels the field from the first connection line, transforming what would be leakage radiation into a self-compensating structure.
3Object-generated harmful factors
If connection lines are routed in close proximity to compensate magnetic fields, then electromagnetic leakage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The first and second connection lines are merged into a single integrated routing structure that extends from the coil end through the housing to the electrical connection. This merging ensures that the lines maintain close proximity throughout their length, providing consistent magnetic field compensation while simplifying the manufacturing process through a unified design.
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 significantly reduces electromagnetic leakage, enhancing the quality of hearing aid devices by minimizing interference and allowing for higher system amplification and reduced radio-frequency emissions, thus stabilizing acoustic coil operation and shortening development times for higher power class devices.
Implementation Method 1
the internal connection lines are at least substantially consolidated close together and directed from the coil ends to the electrical connections... both connection lines are in close proximity over a better part or a majority of their length so that their magnetic fields largely compensate one another
Implementation Method 2
a coil through which an energizing current flows as well as a membrane, are arranged such that the membrane can be excited to vibrate as a result of the energizing current
Data Source
AI summary
In an electromagnetic earpiece with a housing in which a coil through which an energizing current flows as well as a membrane are arranged such that the membrane can be excited to vibrate as a result of the energizing current, the parasitic leakage field generated by the electromagnetic earpiece is be reduced. This is accomplished by internally-running connection lines optimally close together between the ends of the coil and the electrical connections of the electromagnetic earpiece so that the leakage field thereby generated is kept optimally low according to the physical principle of a double conductor, producing an advantageous electromagnetic earpiece in a hearing aid device.