Dual-Diaphragm Speaker Magnetic Circuit for Higher BL
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Solution Overview
Problem
Existing back-to-back speakers waste space at the bottom of the voice coils due to inefficient use of the magnetic circuit system, leading to reduced sensitivity and loudness.
Innovation Solution
The speaker design includes a magnetic circuit system with stacked main and auxiliary magnets forming interconnected magnetic gaps, enhancing magnetic permeability and utilizing space below the voice coils to improve sensitivity and loudness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the traditional magnetic circuit system is used with separate voice coil arrangements, then the structure is simple, but the space at the bottom of the voice coil is wasted and the magnetic flux density (BL) is insufficient
Solution Approach 1:
The patent merges the magnetic circuit systems of the first and second voice coils by stacking the first main magnet on the second main magnet and connecting their magnetic gaps. This integration allows the first voice coil to utilize the magnetic field generated by both the first and second main magnets, effectively using the space below the second voice coil that would otherwise be wasted, thereby increasing the magnetic flux density (BL) of the first voice coil.
Solution Approach 2:
The patent extends the magnetic circuit system in the vertical dimension by stacking main magnets and arranging auxiliary magnets at different heights. The first auxiliary magnets are positioned above the second auxiliary magnets, creating a multi-level magnetic field structure that enables the first voice coil to access magnetic flux from multiple sources, thus improving BL without increasing horizontal space occupation.
2Volume of moving object
If the voice coils are arranged with projections overlapping, then space is saved, but the magnetic circuit system cannot effectively utilize the space below the voice coils
Solution Approach 1:
The patent segments the magnetic circuit system into distinct components: first main magnet and second main magnet stacked vertically, first auxiliary magnets positioned above second auxiliary magnets, and corresponding pole plates. This segmentation allows each component to serve specific functions while collectively improving space utilization below the voice coils without creating excessive structural complexity.
Solution Approach 2:
The patent implements a nested arrangement where the first auxiliary magnets are positioned above the second auxiliary magnets, and the first main magnet is stacked on the second main magnet. This nested structure allows the magnetic fields to overlap and interact, enabling the first voice coil to utilize the magnetic flux from both main magnets while maintaining a compact overall structure.
3Manufacturing precision
If the magnetic gaps are not interconnected, then the magnetic circuit is simpler, but the magnetic flux density (BL) of the voice coils is reduced
Solution Approach 1:
The patent merges the first magnetic gap and second magnetic gap by positioning the first auxiliary magnets above the second auxiliary magnets and connecting them through the stacked main magnets. This connection creates an integrated magnetic circuit where magnetic flux can flow through both gaps, increasing the magnetic flux density (BL) experienced by the first voice coil while maintaining a manageable structural complexity.
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 improved magnetic circuit system increases the magnetic flux density (BL) of the voice coils, enhancing sensitivity and loudness of the speaker.
Implementation Method 1
a magnetic circuit system located in the receiving room to drive the first vibration system and the second vibration system. The first vibration system includes a first diaphragm and a first voice coil connected with the first diaphragm and driving the first diaphragm to vibrate and generate sounds.
Implementation Method 2
The magnetic circuit system includes a first main magnet proximal to the first vibration system, a plurality of first auxiliary magnets located outside the first main magnet and forming a first magnetic gap with the first main magnet, a second main magnet proximal to the second vibration system, and a plurality of second auxiliary magnets located outside the second main magnet and forming a second magnetic gap with the second main magnet.
Data Source
AI summary
The present invention provides a speaker including a first frame, a second frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. The magnetic circuit system includes a first main magnet, first auxiliary magnets, a second main magnet and second auxiliary magnets. A projection of the first voice coil along a vibration direction of the speaker is located out of the second voice coil, and the projection of the second voice coil along the vibration direction of the speaker is located on the first main magnet. In present invention, the BL of the second voice coil is increased, the sensitivity of the speaker is improved, and the loudness becomes larger.