Micro Speaker Voice Coil Fixing Arm Amplitude Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional micro speakers face issues with voice coil stability and oblique collisions due to limited space and weight distribution of lower fixing arms, leading to reduced amplitude and potential damage to flexible circuit boards.
Innovation Solution
A micro speaker design featuring a vibrating diaphragm unit, magnetic unit, and circuit unit with a voice coil connected via upper and lower fixing arms, utilizing flexible circuit boards and elastic connecting arms to stabilize amplitude and prevent collisions, with a rectangular interval and injection-molded components for enhanced stability and adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lower fixing arm is disposed on the short edge of the voice coil, then the voice coil can be fixed to the outer frame, but the width of the lower fixing arm is not enough, which prevents the voice coil from generating a larger up-and-down amplitude
Solution Approach 1:
The lower fixing arm is repositioned from the short edge to the long edge of the voice coil, utilizing the additional dimensional space available on the long edge to increase the width of the fixing arm without interfering with the voice coil's vertical vibration amplitude
Solution Approach 2:
The lower fixing arm is divided into multiple segments or components that can be independently optimized, allowing the width to be increased on the long edge while maintaining proper fixation function
2Length of moving object
If the lower fixing arm is disposed on the short edge of the voice coil, then the voice coil can be fixed to the outer frame, but the volume of the entire lower fixing arm becomes too large, making it too heavy and affecting the up-and-down amplitude of the voice coil
Solution Approach 1:
By moving the lower fixing arm to the long edge of the voice coil, the design utilizes the available space more efficiently, increasing the width for better fixation while distributing the mass in a way that minimizes its impact on the voice coil's vibration amplitude
Solution Approach 2:
The lower fixing arm is designed with non-uniform cross-section, being wider where needed for fixation on the long edge and narrower in other areas, optimizing the local quality to reduce overall weight while maintaining fixation strength
3Ease of manufacture
If the lower fixing arm and the flexible circuit board are designed separately and then adhered between the voice coil and the outer frame, then both components can be manufactured independently, but the flexible circuit board is pulled easily during voice coil vibration, causing damage and reducing the micro speaker's lifespan
Solution Approach 1:
The lower fixing arm and flexible circuit board are merged into a single integrated component, eliminating the adhesive joint that was prone to failure during vibration. This integration maintains ease of manufacture through molding while dramatically improving reliability by removing the weak connection point
Solution Approach 2:
The integrated lower fixing arm and flexible circuit board are manufactured using composite materials that combine the structural properties of the fixing arm with the electrical and flexible properties of the circuit board, creating a unified component that withstands vibration without separation
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 design achieves stable up-and-down amplitude generation and prevents oblique collisions, improving the voice coil's vibration stability and extending the micro speaker's lifespan by optimizing the voice coil's movement and reducing the risk of damage to the flexible circuit boards.
Implementation Method 1
a voice coil mainly surrounds a magnetic element to form excitation between the voice coil and the magnetic element after being energized, so that the voice coil can drive a diaphragm above an outer edge of the magnetic element to form an up-and-down amplitude, thereby enabling the diaphragm to tap air to sound
Data Source
AI summary
A micro speaker with amplitude stability, includes a vibrating diaphragm unit, a magnetic unit which is disposed below the vibrating diaphragm unit, and a circuit unit which is disposed between the vibrating diaphragm unit and the magnetic unit. The vibrating diaphragm unit includes a diaphragm which is connected with a voice coil; whereas the diaphragm and the voice coil are connected electrically by an upper fixing arm on the vibrating diaphragm unit, and a pair of flexible circuit board disposed in the circuit unit. The circuit unit also includes plural lower fixing arms to connect and support the flexible circuit boards. Therefore, when an external power source energizes the circuit unit, the voice coil can drive the diaphragm to generate a stable amplitude along the height of the magnetic element, through the upper fixing arm and the lower fixing arms.