Balanced Acoustic Transducer Structure Against Gap Closure
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Solution Overview
Problem
Existing acoustic transducers face challenges due to a delicate balance of static magnetic forces, which can lead to malfunction when external forces cause the gap between transducer parts to close, and they are difficult to manufacture in one integral piece.
Innovation Solution
The acoustic transducer design features an upper and lower part with permanent magnets and magnetic covers, a separating gap allowing relative movement, and a coil generating dynamic magnetic forces. This design maintains a balanced static magnetic force and allows for integral manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between upper and lower parts is made small to improve acoustic performance, then the acoustic performance is improved, but the transducer becomes sensitive to external forces and may malfunction
Solution Approach 1:
The patent applies counterbalancing magnetic forces by configuring the permanent magnets and magnetic covers to generate both attracting and repelling forces. The repelling force acts as a counterweight to prevent the gap from closing completely under external pressure, while the attracting force maintains the gap at an optimal small distance for acoustic performance. This dual-force magnetic system resolves the contradiction between needing a small gap for performance and preventing gap closure under external forces.
2Ease of operation
If the transducer is designed as separate parts for easier assembly, then the ease of assembly is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the upper cover, lower cover, and permanent magnets into a single integrated transducer unit that can be manufactured as one piece. This integration reduces the number of separate parts and simplifies assembly, while the internal magnetic structure maintains the necessary functional complexity for acoustic performance. The magnetic covers and magnets are positioned within the integral structure to provide both assembly simplicity and functional sophistication.
3Force
If the static magnetic force is increased to improve the magnetic field strength, then the magnetic field strength is improved, but the transducer becomes more sensitive to gap closure
Solution Approach 1:
The patent changes the magnetic force parameters by using opposing magnetic polarities in the permanent magnets to create both attracting and repelling forces. Instead of simply increasing the magnetic field strength in one direction, the system adjusts the balance between attractive and repulsive forces. This parameter adjustment allows strong magnetic coupling for acoustic performance while the repelling component prevents excessive force that would cause gap closure and malfunction.
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 enhances the robustness of the acoustic transducer by maintaining a balanced static magnetic force, preventing malfunction due to external forces, and enabling manufacturing in an integral piece for easier assembly.
Implementation Method 1
The magnetic poles of the first and second permanent magnets 104 and 105 are oriented in a repelling configuration, so that their similarly named poles (either S poles or N poles) face each other. Thus the static magnetic force resulting from the mutually facing similarly named magnetic poles constantly pushes the upper and lower parts 101 and 102 away from each other.
Implementation Method 2
The magnetic property of the upper and lower covers 106 and 107 concentrates and guides the magnetic field lines of the first and second permanent magnets 104 and 105 so that as a result, an attracting static magnetic force appears at the edges of the horizontal gap 103.
Implementation Method 3
A varying electric current flowing through the coil 108 induces a dynamic magnetic field that sums up with the static magnetic fields explained above, making the upper part 101 move vertically with respect to the lower part 102.
Data Source
AI summary
Acoustic transducer comprises an upper part (301) and a lower part (302), with a first permanent magnet (303) in the upper part (301) and a second permanent magnet (304) in the lower part (302). Similarly named magnetic poles of the first and second permanent magnets (303, 304) face each other. An upper cover (306) in the upper part (301) and a lower cover (307) in the lower part (302) comprise magnetic material and define an enclosure around the magnets (303, 304). A coil (308) creates, under influence of an electric current, dynamic magnetic forces. A separating gap (309) between edges of said upper cover (306) and lower cover (307) is directed so that it allows a relative movement of the edges of said lower cover (307) and said upper cover (306) between different positions, said positions differing in the extent to which edges coincide.