Monolithic Voice-Coil Balancing System for Micro-Speakers
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Solution Overview
Problem
Micro-speakers face a reduction in sound output due to smaller magnet volumes, leading to increased risk of voice coil lead tearing from excessive amplitude, especially in portable electronic products where size reduction is prioritized.
Innovation Solution
A monolithic, one-piece voice-coil balancing system composed of symmetrically arranged dampers and a support frame made of flexible circuit board, with a cantilever ratio of 2-15, integrated into the micro-speaker frame to stabilize the voice coil and reduce assembly complexity, eliminating the need for embedded iron or metal parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the magnet volume is reduced to decrease the micro-speaker size, then the portability is improved, but the sound output decreases
Solution Approach 1:
The patent changes the structural parameters of the voice coil assembly by introducing a balancing system with dampers and adjusting the cantilever length ratio (L/D = 2-15), enabling the reduced magnet to achieve stable operation at higher power levels without voice coil lead tearing
Solution Approach 2:
The patent introduces dynamic damping elements (cantilevers with specific L/D ratios) that actively manage the vibration and movement of the voice coil assembly, allowing the system to operate stably at higher amplitudes despite the smaller magnet size
2Power
If the power is increased to compensate for the decrease in sound output, then the sound output is improved, but the risk of voice coil lead tearing increases
Solution Approach 1:
The patent incorporates pre-designed damping structures (cantilevers with optimized L/D ratios) that cushion and absorb the excessive vibrations before they can damage the voice coil leads, enabling high power operation without increasing the risk of lead tearing
Solution Approach 2:
The patent introduces a balancing system with dampers as an intermediary between the voice coil and the frame, which mediates the mechanical stresses and vibrations, protecting the voice coil leads from tearing while allowing high power operation
3Reliability
If a traditional voice coil balancing system with embedded iron or metal parts is used, then the balancing performance is improved, but the assembly complexity increases
Solution Approach 1:
The patent merges the damper structure with the flexible circuit board to form an integrated one-piece balancing system, eliminating the need for separate embedded iron or metal parts and simplifying the assembly process while maintaining balancing performance
Solution Approach 2:
The flexible circuit board serves multiple functions simultaneously: it provides electrical connections and structural support while the integrated dampers provide vibration balancing, eliminating the need for separate balancing components
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 enhances voice coil balancing performance, increases rated power, and maintains sound quality by distributing amplitude across the flexible dampers, allowing the micro-speaker to operate effectively under high power and pass life tests, even with reduced size.
Implementation Method 1
A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15
Implementation Method 2
The two dampers and the support frame are made of a flexible circuit board
Data Source
AI summary
A micro-speaker includes a frame body, a diaphragm arranged on the frame body, a magnetic structure and a voice coil arranged in the frame body. An upper end of the voice coil is fixed to the diaphragm. The magnetic structure is arranged under the voice coil. A monolithic, one-piece voice-coil balancing system is fixed under the frame body. The monolithic, one-piece voice coil balancing system is composed of two symmetrically arranged dampers connected to an integrally formed support frame. The two dampers and the support frame are made of a flexible circuit board. Each of the two dampers comprises a first end, a second end and a cantilever connecting the first end and the second end. A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15.