Planar Magnetic Diaphragm Subcircuits for Uniform Force Distribution
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Solution Overview
Problem
Planar magnetic transducers experience sound distortion due to irregular and nonlinear magnetic fields, which cause nonlinear conversion of electrical energy into mechanical energy and sound, leading to uneven force distribution across the diaphragm.
Innovation Solution
The diaphragm is designed with conductive circuits divided into separate subcircuits that correspond to varying magnetic field strengths, ensuring equivalent Lorentz forces are produced uniformly across the diaphragm, thereby minimizing sound distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single continuous conductive circuit is used on the diaphragm, then the circuit structure is simple, but the magnetic field interaction is nonlinear causing sound distortion
Solution Approach 1:
The conductive circuit on the diaphragm is divided into multiple separate subcircuits (e.g., first subcircuit, second subcircuit, third subcircuit) with different electrical resistances. Each subcircuit is positioned in regions with different magnetic field strengths, allowing independent current control to achieve uniform Lorentz force distribution across the diaphragm surface, thereby reducing sound distortion.
2Ease of operation
If uniform current is applied across the entire circuit, then the electrical signal is simple, but the force distribution across the diaphragm is uneven
Solution Approach 1:
Different subcircuits are designed with different electrical resistances tailored to their specific positions on the diaphragm. Subcircuits in regions with stronger magnetic fields are assigned higher resistance to limit current, while subcircuits in weaker field regions have lower resistance to increase current. This local differentiation ensures that each region receives the appropriate current to produce uniform Lorentz force across the entire diaphragm.
3Force
If the circuit is divided into separate subcircuits with different resistances, then uniform force distribution is achieved, but the manufacturing complexity increases
Solution Approach 1:
The electrical resistance parameter of each subcircuit is specifically adjusted according to the magnetic field strength at its location. By changing the resistance parameter (through varying trace width, length, or material properties), the patent achieves uniform force distribution without requiring complex multi-layer structures or additional components, making the solution manufacturable with standard techniques.
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 configuration results in a uniform force distribution across the diaphragm, reducing sound distortion and enhancing the linear conversion of electric sound signals into sound waves.
Implementation Method 1
When energized with a voltage or current in the magnetic field, the conductive circuit creates forces that are transferred to the diaphragm which produces sound
Data Source
AI summary
An electroacoustic diaphragm comprises a membrane, and an electrically conductive circuit carried by the membrane, such that a segment of the electrically conductive circuit is divided into two or more separate subcircuits. An electroacoustic transducer assembly comprises a frame, the novel diaphragm supported on the frame, and a magnetic element disposed adjacent the novel diaphragm whereby the transducer achieves uniform force distribution across the novel diaphragm. An audio device comprises a housing having an acoustic opening and the electroacoustic transducer including the novel diaphragm. Methods for constructing a transducer comprises determining the flux density of a magnetic field and configuring a diaphragm with separate subcircuits to correlate or inversely correlate to the flux density.