Multi-Coil Speaker Voice Coil Structure for Adjustable Impedance
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Solution Overview
Problem
Conventional speaker voice coil structures have limited flexibility due to fixed impedance options and insufficient accommodation space, leading to wire slippage off the bobbin when the number of turns exceeds four, restricting application flexibility.
Innovation Solution
A voice coil structure with at least three coils wound around a bobbin, featuring multiple, evenly spaced terminals to provide adjustable impedance options and prevent wire slippage, allowing for independent impedance settings and efficient space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of turns exceeds four, then the impedance options increase, but the wire slips off the bobbin due to insufficient accommodation space
Solution Approach 1:
The voice coil is divided into multiple independent coils (first coil, second coil, third coil) with separate terminals. Each coil can be independently connected to provide different impedance options, eliminating the need to increase turns beyond four while maintaining wire stability.
Solution Approach 2:
Instead of increasing the number of turns in a single coil, the patent adds another dimension by introducing multiple separate coils with different terminal configurations. This allows impedance variation through selective connection of multiple coils rather than increasing turns in one coil.
2Adaptability or versatility
If only one set of input terminals is provided, then the structure is simple, but only one impedance option is available
Solution Approach 1:
The multiple terminals of the voice coil structure serve multiple functions: they can be connected in series to provide higher impedance or in parallel to provide lower impedance. This multi-functional terminal design allows a single voice coil structure to replace multiple voice coils with different fixed impedances.
Solution Approach 2:
The impedance of the voice coil is made dynamic and adjustable through different terminal connections rather than being fixed. Users can select different impedance values by connecting terminals differently, transforming the static impedance characteristic into a dynamic one adaptable to different application requirements.
3Adaptability or versatility
If two voice coils are used, then impedance options increase, but the wire slips off due to insufficient accommodation space
Solution Approach 1:
The patent winds multiple coils (first, second, and third coils) around the same bobbin in a nested arrangement. Each subsequent coil is wound around the previous coil, efficiently utilizing the bobbin space and preventing wire slippage while providing multiple impedance options through different terminal connections.
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 improved voice coil structure offers multiple connection and impedance options, minimizing space occupation and preventing wire slippage, thereby enhancing application flexibility and power transformation efficiency.
Implementation Method 1
a current will flow through a voice coil of the speaker, and a motive force to a paper cone will be generated by the reaction of the current to a magnetic field to produce sound
Data Source
AI summary
An improved speaker voice coil structure, the structure including: a bobbin; a first voice coil, wound around the bobbin and having a first terminal and a second terminal; a second voice coil, wound around the first voice coil and having a third terminal and a fourth terminal; and a third voice coil, wound around the second voice coil and having a fifth terminal and a sixth terminal. The improved voice coil structure thereby provides multiple optional connection terminals—from different layers with different values of impedance—for an input signal.