Speaker Bobbin Magnet Support for Precise Vibration Detection
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Solution Overview
Problem
Existing speaker systems struggle with precise sound quality control and distortion due to the inability to directly detect the movement of the voice coil and bobbin, leading to inefficient feedback correction and potential damage from excessive diaphragm amplitude.
Innovation Solution
A speaker design incorporating a moving magnet and magnetic sensor with a magnet support attached to the bobbin, allowing for precise detection of the vibrating unit's movement by sensing the composite magnetic field vector, enabling accurate feedback control and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall element is used to detect effective magnetic flux density changes in the gap, then power consumption is reduced and size is controlled, but direct detection of voice coil and bobbin movement is not achieved, resulting in insufficient distortion correction precision
Solution Approach 1:
The patent replaces the indirect magnetic flux density detection method with a direct mechanical movement detection method by attaching a magnet to the bobbin and using a magnetic sensor to detect the magnet's position. This substitution enables direct measurement of voice coil and bobbin movement, significantly improving distortion correction precision while maintaining acceptable device complexity.
Solution Approach 2:
The patent introduces a magnet as an intermediary element attached to the bobbin. This magnet serves as a mediator that translates the mechanical movement of the voice coil and bobbin into a detectable magnetic field variation for the magnetic sensor, enabling precise direct detection without complex installation structures.
2Ease of manufacture
If the Hall element is embedded in the plate surface facing the voice coil, then magnetic flux detection is enabled, but the installation structure becomes complex and assembly efficiency decreases
Solution Approach 1:
Instead of embedding the detection element (Hall element) into the stationary plate structure, the patent inverts the approach by attaching a magnet to the moving bobbin and placing the magnetic sensor on the stationary side. This inversion simplifies the installation structure and improves assembly efficiency while achieving the same detection function.
Solution Approach 2:
The patent replaces the mechanical embedding of a Hall element into the plate surface with a magnetic field-based detection system. By using a magnet attached to the bobbin and a magnetic sensor on the plate, the system eliminates the need for complex embedding structures while maintaining detection functionality.
3Reliability
If feedback control is implemented using magnetic flux density detection, then some distortion correction is achieved, but the correction precision is insufficient due to indirect detection of bobbin movement
Solution Approach 1:
The patent replaces the indirect magnetic flux density detection method with direct mechanical movement detection by attaching a magnet to the bobbin. This substitution enables the magnetic sensor to directly measure the position and movement of the voice coil and bobbin, significantly improving the precision of feedback control and sound quality correction.
Solution Approach 2:
The patent implements feedback control using direct movement detection data from the magnetic sensor. By continuously monitoring the actual position of the bobbin and comparing it with the desired position, the system generates correction signals to minimize distortion, thereby improving sound quality control reliability through more accurate feedback information.
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 solution allows for high-precision feedback control of the speaker's vibrating unit, reducing sound distortion and preventing damage by directly detecting the movement of the voice coil and bobbin, thus enhancing sound quality and durability.
Implementation Method 1
a direction of a magnetic field applied from the magnetic circuit unit to the magnetic sensor preferably crosses a direction of a magnetic field applied from the moving magnet to the magnetic sensor. A detection output based on a change in a direction of a composite vector of the two magnetic fields is preferably obtained from the magnetic sensor.
Data Source
AI summary
A vibrating unit includes a diaphragm and a bobbin, and a voice coil is secured to the bobbin. A detecting unit includes a moving magnet and a magnetic sensor. An annular magnet support is secured to a front edge of the bobbin, and the moving magnet is positioned and secured to the magnet support. The magnetic sensor is secured to a drive supporting unit. The moving magnet is secured to the bobbin, with the magnet support therebetween. This facilitates mounting and positioning of the moving magnet.