Electrostatic Speaker With Counterweight Body Eliminates Magnetic Interference
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Solution Overview
Problem
Conventional speakers using magnetic steel and coils interfere with nearby devices due to magnetic field interference, and they have complex structures that occupy significant space.
Innovation Solution
A speaker design featuring a counterweight body, lower and middle shells, and an ion-conductive electric vibration plate that drives a dome to move when voltage is applied, eliminating the need for magnetic components and allowing for a simpler, more compact structure that prevents magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic steel and coil are used in speaker, then sound production is achieved, but magnetic field interference occurs with nearby devices
Solution Approach 1:
The patent replaces the electromagnetic system (magnetic steel and coil) with an electrostatic system consisting of a first electrode, second electrode, and diaphragm. The electrostatic attraction between charged electrodes drives the diaphragm to vibrate and produce sound, eliminating magnetic field generation while maintaining sound production functionality
Solution Approach 2:
The patent extracts and removes the magnetic components (magnetic steel and coil) from the speaker structure, retaining only the essential sound production elements (electrodes and diaphragm). This extraction eliminates the source of magnetic field interference while preserving the core function of sound generation
2Reliability
If magnetic steel and coil are used in speaker, then sound production is achieved, but device complexity increases
Solution Approach 1:
The complex electromagnetic system with magnetic steel, voice coil, and associated components is replaced with a simpler electrostatic system using only electrodes and a diaphragm. This substitution reduces structural complexity while maintaining sound production capability
Solution Approach 2:
By removing the magnetic steel and coil components, the patent simplifies the speaker structure to essential elements only (electrodes and diaphragm), reducing device complexity while preserving core functionality
3Reliability
If magnetic steel and coil are used in speaker, then sound production is achieved, but occupied space increases
Solution Approach 1:
The bulky electromagnetic components (magnetic steel and coil assemblies) are replaced with compact electrostatic elements (thin electrodes and diaphragm). This substitution significantly reduces the volume occupied by the speaker while maintaining sound production function
Solution Approach 2:
By extracting and removing the large-volume magnetic components, the patent reduces the overall speaker size to only the essential thin-film electrostatic elements, achieving compact dimensions suitable for thin electronic devices
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 solution effectively prevents magnetic field interference and allows for a thinner electronic device design while maintaining sound production through the movement of the dome, driven by the ion-conductive vibration plate, which can be controlled for varying distances and rates.
Implementation Method 1
the electric vibration plate is an ion-conductive vibration plate; when a voltage applied to the ion-conductive vibration plate is a first voltage, the ion-conductive vibration plate drives the dome to move along a first direction
Data Source
AI summary
A speaker and an electronic device are provided. The speaker includes a counterweight body, and a lower shell, a middle shell, an electric vibration plate, and a dome where the lower shell, the middle shell, and the electric vibration plate are matched to form an accommodating cavity, and the counterweight body is disposed in the accommodating cavity and is connected to a first surface of the electric vibration plate; the dome is disposed on a second surface of the electric vibration plate away from the counterweight body; and when a voltage is applied to the electric vibration plate, the electric vibration plate drives the dome to move.