Planar Diaphragm Driver Quadruple Coil Current Flow
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Solution Overview
Problem
Conventional moving coil loudspeakers are prone to breakage due to differing electric current flow directions at equidistant locations on the diaphragm, leading to sound distortion and increased risk of tear.
Innovation Solution
A planar diaphragm driver with a quadruple coil arrangement where the first and third coils have the same electric current flow direction at equidistant locations, and the second and fourth coils have the same flow direction, symmetrically positioned to minimize interference and maintain uniform vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is provided on the diaphragm, then the device complexity is reduced, but the diaphragm is prone to breakage and tear due to opposite current flow directions at equidistant locations
Solution Approach 1:
The single coil is divided into four separate coils (first, second, third, and fourth coils) arranged in a specific pattern on the diaphragm. This segmentation allows each coil to be independently controlled to achieve uniform current flow directions, preventing the diaphragm from breaking while maintaining manageable complexity through modular coil design.
2Loss of information
If coils are arranged to produce sound, then sound quality is improved, but electric current flow directions at equidistant locations differ causing diaphragm breakage
Solution Approach 1:
Each coil is assigned a specific spatial location and current flow direction on the diaphragm surface. The first and third coils are configured to produce current flowing in the same direction at equidistant locations, while the second and fourth coils do the same. This local quality control ensures uniform diaphragm vibration without breakage, improving sound quality while maintaining reliability.
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 reduces the occurrence of breakage and tear in the diaphragm, enhancing sound quality and treble performance by ensuring consistent electric current flow and reduced interference between coils.
Implementation Method 1
an electric current corresponding to a sound frequency is fed along the coil so as to cause a modification in a magnetic field of the coil owing to electromagnetic induction and thereby drive vibration of the diaphragm to agitate the air and produce sounds
Data Source
AI summary
An improved planar diaphragm driver includes: a membrane; a first coil, disposed at a first side on a first surface of the membrane; a second coil, disposed at a first side on a second surface of the membrane and electrically connected to the first coil; a third coil, disposed at a second side on the first surface of the membrane and electrically connected to the second coil; and a fourth coil, disposed at a second side on the second surface of the membrane and electrically connected to the third coil. The first and third coils are configured to have a same flowing direction of an electric current at both respective locations thereon equidistant from a central axis of the membrane, and the second and fourth coils also are configured to have a same flowing direction of the electric current at both respective locations thereon equidistant from the central axis.