Tweeter Magnetic Circuit Layout for Higher Flux Density
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Solution Overview
Problem
Current tweeters in electronic devices suffer from poor high-frequency performance and low efficiency, affecting sound quality.
Innovation Solution
A speaker design with a first upper magnetic conductor disposed on the inner side of the voice coil to concentrate magnetic flux lines, enhancing magnetic flux density and efficiency without increasing the speaker's size, combined with a symmetrical magnetic field distribution and a variable-height housing to improve high-frequency performance and acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the size of the magnet is increased to improve magnetic flux density at the voice coil, then the magnetic flux density is enhanced, but the overall width and thickness of the speaker increase
Solution Approach 1:
The patent introduces an upper magnetic conductor as an intermediary component positioned between the magnet and the voice coil. This magnetic conductor serves as a mediator that concentrates and guides magnetic flux lines from the magnet to the voice coil, enhancing magnetic flux density without requiring an increase in magnet size. The magnetic conductor effectively bridges the magnetic circuit, allowing for improved magnetic coupling while maintaining compact dimensions.
Solution Approach 2:
The patent applies local quality by positioning the upper magnetic conductor specifically at the region where magnetic flux concentration is needed - directly above the voice coil and below the magnet. This localized intervention focuses the magnetic flux precisely where it is most needed, improving magnetic flux density at the voice coil without uniformly increasing the entire magnetic circuit size. The magnetic conductor creates a localized enhancement zone rather than requiring global scaling of all components.
2Reliability
If conventional tweeter designs are used, then the speaker structure is simple, but high-frequency performance and efficiency are poor
Solution Approach 1:
The upper magnetic conductor acts as a mediator that improves high-frequency performance by enhancing the magnetic field strength at the voice coil. This intermediary component ensures more effective magnetic coupling, which is critical for driving the voice coil with sufficient force to produce high-frequency sounds. The magnetic conductor mediates the energy transfer from the magnet to the voice coil, improving efficiency and high-frequency response.
Solution Approach 2:
The patent changes the magnetic field parameters by introducing the upper magnetic conductor, which alters the distribution and density of magnetic flux lines. This parameter change - specifically increasing magnetic flux density at the voice coil - directly improves the force factor and efficiency of the speaker, enabling better high-frequency performance. The modification changes the magnetic circuit parameters without fundamentally changing the speaker type or requiring complete redesign.
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 design improves magnetic flux density at the voice coil, enhances speaker efficiency, and expands frequency bandwidth with better high-frequency performance and acoustic output.
Implementation Method 1
the first upper magnetic conductor may concentrate the magnetic flux lines in a magnetic field generated between the first magnet and the second magnet at the position of the voice coil
Implementation Method 2
a force factor of the magnetic field can be effectively increased
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
This application provides a speaker and an electronic device. The speaker includes a first magnet, a second magnet, a diaphragm, a voice coil, and a first upper magnetic conductor. The first magnet is located on an inner side of the second magnet. The diaphragm is disposed opposite to and spaced apart from the first magnet and the second magnet. The voice coil is fastened to a surface that is of the diaphragm and that faces the first magnet. The voice coil is spaced apart from the first magnet and the second magnet, and a projection of the voice coil in a first direction overlaps a part of the first magnet and/or a part of the second magnet. The first direction is a thickness direction of the speaker. The first upper magnetic conductor is fastened to a surface that is of the first magnet and that faces the diaphragm. The first upper magnetic conductor is spaced apart from the diaphragm and the voice coil, and a part of the first upper magnetic conductor is located on an inner side of the voice coil. In this application, the first upper magnetic conductor is disposed on the inner side of the voice coil, to concentrate magnetic flux lines in a magnetic field generated by the first magnet and the second magnet at a position of the voice coil, so that magnetic flux density at the position of the voice coil is enhanced, efficiency of the speaker is improved, and high-frequency performance of the speaker is improved.