Annular Armature Audio Playback Device Minimizing Magnetic Resistance
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Solution Overview
Problem
The challenge is to develop an audio playback device for handheld electronic devices that maintains high performance while minimizing size, as existing devices struggle to shrink their volume without compromising audio quality.
Innovation Solution
The device incorporates a magnetic module with parallel yokes, an annular armature, and coil modules that generate varying electromagnetic poles, causing the armature to vibrate and drive a diaphragm to produce sound waves, optimizing vibration efficiency and sound quality within a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the audio playback device is reduced to meet the requirement of handheld electronic devices, then the device becomes more portable and compact, but the audio performance and vibration efficiency deteriorate
Solution Approach 1:
The armature is divided into multiple independent arms (first arm, second arm, third arm, fourth arm) that can vibrate independently. Each arm is connected to specific coil modules that generate localized electromagnetic forces, allowing segmented vibration control. This segmentation enables efficient use of space while maintaining vibration efficiency, as each segment can be optimized independently for its specific function.
Solution Approach 2:
The patent transitions from a conventional single-dimension speaker design to a three-dimensional annular armature structure. The armature forms a hollow area with multiple arms extending in different spatial directions, creating a multi-dimensional vibration system. This dimensional transformation allows the compact device to achieve enhanced vibration efficiency by utilizing spatial distribution of magnetic fields and vibration sources.
2Device complexity
If conventional magnetic structures are used, then the device structure is simple, but the magnetic resistance is high which reduces vibration efficiency
Solution Approach 1:
The patent extracts and removes the traditional magnetic resistance barrier by introducing a hollow area within the armature structure. This hollow space allows magnetic field lines to pass through with minimal resistance, effectively removing the magnetic resistance bottleneck. The extraction of this restrictive element enables significantly improved vibration efficiency while maintaining relatively simple overall structure.
Solution Approach 2:
The hollow area acts as an intermediary channel that facilitates magnetic field transmission between the coil modules and the vibrating arms. By introducing this intermediate space, the magnetic field can flow more efficiently through the armature, reducing magnetic resistance and enhancing the coupling between electromagnetic forces and mechanical vibration.
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 configuration allows for high vibration efficiency and effective sound wave generation, achieving good audio quality despite the small size of the device, with the magnetic resistance of the armature being minimized to enhance performance.
Implementation Method 1
The at least one coil module is wound on the second arm and generates two varying electro-magnetic poles corresponding to the third arm and the fourth arm respectively according to an alternating current signal, such that the annular armature vibrates according to a magnetic relation of the two varying electro-magnetic poles and the magnetic field
Implementation Method 2
The magnetic module includes a magnetic source and two yokes, wherein each of the two yokes is connected to one of two magnetic poles generated by the magnetic source, and the two yokes extend substantially in parallel to form a magnetic field therebetween
Implementation Method 3
The diaphragm is connected to the annular armature through a driving rod to vibrate according to a vibration of the annular armature to generate a sound wave
Data Source
AI summary
An audio playback device is provided. The audio playback device includes a magnetic module, an annular armature, a coil module and a diaphragm. The magnetic module includes a magnetic source and two yokes each connected to one of two magnetic poles generated by the magnetic source and extends to form a magnetic field. The annular armature includes a first, a second, a third and a fourth arms that form a hollow area. At least part of the first arm is located in the magnetic area. The coil module is winded on the second arm and generates two varying electro-magnetic poles according to an alternating current data signal. The annular armature vibrates according to a relation of the two varying electro-magnetic poles and the magnetic field. The diaphragm is connected to the annular armature through a driving rod to vibrate according to the annular armature to generate a sound wave.