Bone Conduction Speaker Magnetic Gap Design for Compact High Output
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Solution Overview
Problem
Bone conduction speakers face challenges in increasing sensitivity and efficiency due to higher mechanical power requirements, leading to reduced performance and shorter service life.
Innovation Solution
A magnetic circuit assembly with multiple magnetic elements and guide elements is designed to generate a strong magnetic field within a magnetic gap, enhancing magnetic induction intensity and reducing volume and weight, thereby improving sensitivity and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the mechanical power is increased to drive soft tissues and bones, then the sensitivity and efficiency are improved, but the device volume and weight increase
Solution Approach 1:
The patent employs multiple magnetic elements with different polarities arranged in a specific configuration to generate a strong magnetic field in a reduced volume. This parameter optimization allows achieving high mechanical power output without proportionally increasing device weight, as the magnetic field strength is enhanced through strategic arrangement rather than simply scaling up all components.
Solution Approach 2:
The magnetic circuit is divided into multiple magnetic elements (first magnetic element, second magnetic element, third magnetic element) with different polarities. This segmentation allows the magnetic field to be concentrated and optimized in specific regions, particularly in the magnetic gap, enabling high power density without requiring a large overall device volume or weight.
2Power
If the mechanical power is increased to drive soft tissues and bones, then the sensitivity and efficiency are improved, but the device volume increases
Solution Approach 1:
The patent optimizes the spatial arrangement and polarity configuration of multiple magnetic elements to concentrate the magnetic field in a compact volume. By adjusting the parameters of magnetic field strength distribution rather than simply increasing overall size, the device achieves high mechanical power output within a reduced volume, particularly optimizing the magnetic gap region where the voice coil operates.
Solution Approach 2:
The magnetic elements are arranged in a multi-dimensional configuration with alternating polarities, creating a concentrated magnetic field in the magnetic gap through three-dimensional spatial optimization. This dimensional arrangement allows the magnetic flux to be focused in a small volume rather than distributed over a large area, achieving high power density without increasing overall device volume.
3Reliability
If multiple magnetic elements are added to enhance magnetic field, then the sensitivity is improved, but the device complexity increases
Solution Approach 1:
The magnetic circuit is segmented into multiple magnetic elements with alternating polarities arranged in a systematic pattern. This segmentation creates a concentrated magnetic field in the magnetic gap while maintaining a relatively simple overall structure. Each magnetic element performs a specific function in the magnetic flux path, and their alternating arrangement naturally guides the flux through the voice coil without requiring complex additional components.
Solution Approach 2:
The multiple magnetic elements serve multiple functions simultaneously: they generate the magnetic field, guide the magnetic flux through the voice coil, and provide structural support. This multi-functionality reduces the need for separate components, thereby improving sensitivity while limiting the increase in overall device 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 magnetic circuit assembly increases the sensitivity and efficiency of bone conduction speakers, allowing for a smaller, lighter, and more efficient device with extended service life, suitable for integration with wearable smart devices and personal use.
Implementation Method 1
The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element generating a second magnetic field
Implementation Method 2
The bone conduction speaker can convert electrical signals into mechanical vibration signals
Data Source
AI summary
The present disclosure relates to a magnetic circuit assembly of a bone conduction speaker. The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element, and the first magnetic element may generate a second magnetic field. The magnetic circuit may further include a first magnetic guide element and at least one second magnetic element. The at least one second magnetic element may be configured to surround the first magnetic element and a magnetic gap may be configured between the second magnetic element and the first magnetic element. A magnetic field strength of the first magnetic field within the magnetic gap may exceed a magnetic field strength of the second magnetic field within the magnetic gap.