Parallel Voice Coil Segmentation for Low Resistance High BL Value
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Solution Overview
Problem
Traditional loudspeaker designs face a trade-off between internal resistance and BL value, where reducing internal resistance compromises vibration characteristics, and increasing the BL value increases resistance, leading to poor performance.
Innovation Solution
A sound generating unit with a magnetic circuit system and vibration system, featuring a voice coil formed by co-winding two voice coil wires in parallel, which reduces internal resistance while maintaining a higher BL value, improving sensitivity and sound quality by geometrically symmetric lead-out wires and a compact magnetic circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of winding turns and/or layers of the voice coil wire on the voice coil skeleton is increased to increase the BL value, then the BL value is improved, but the internal resistance of the voice coil increases, resulting in poor vibration characteristics
Solution Approach 1:
The voice coil is divided into multiple independent wire units (first wire unit, second wire unit, third wire unit, fourth wire unit) that are wound in parallel around the voice coil skeleton. Each wire unit has its own wire-in end and wire-out end, and they are electrically connected in parallel through the magnetic poles. This segmentation allows the voice coil to achieve higher BL value with more wire units while maintaining low internal resistance through parallel connection.
Solution Approach 2:
Multiple wire units are merged in parallel configuration where the wire-in ends are electrically connected together and the wire-out ends are electrically connected together through the magnetic poles. This parallel merging reduces the overall internal resistance while combining the magnetic interaction effects of all wire units to achieve high BL value.
2Loss of energy
If the number of winding turns and/or layers of the voice coil wire on the voice coil skeleton is reduced to decrease the internal resistance, then the internal resistance is reduced, but the BL value decreases, resulting in poor vibration characteristics
Solution Approach 1:
Instead of increasing turns in a single wire (one-dimensional approach), the invention transitions to a multi-dimensional approach by using multiple wire units wound in parallel around the voice coil skeleton. This spatial arrangement in multiple dimensions allows simultaneous achievement of low resistance (through parallel paths) and high BL value (through combined magnetic interactions).
3Device complexity
If a traditional single wire voice coil structure is used, then the structure is simple, but the internal resistance is relatively large and the BL value cannot be sufficiently increased
Solution Approach 1:
The voice coil is segmented into multiple wire units (first, second, third, fourth wire units) with distinct wire-in and wire-out ends. Each unit is independently wound around the voice coil skeleton, and they are electrically connected in parallel through the magnetic poles, achieving high BL value with controlled resistance.
Solution Approach 2:
The magnetic poles serve multiple functions: they provide the magnetic field for the voice coil operation, and simultaneously serve as electrical connection paths to connect the wire-in ends and wire-out ends of multiple wire units in parallel. This multi-functionality reduces the need for additional connection 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 achieves a thinner voice coil with a narrower magnetic gap, higher sensitivity, and improved sound performance by reducing internal resistance and polarization, resulting in enhanced vibration system sensitivity and sound quality.
Implementation Method 1
the voice coil extends with the other end thereof into the magnetic gap of the magnetic circuit system
Data Source
AI summary
The present disclosure provides a sound generating unit, a sound generating module and electronic terminal, comprising a magnetic circuit system, a vibration system, and a circuit board. The voice coil is jointly wound by two voice coil wires, and the two end portions of each voice coil wire respectively form a wire-in end and a wire-out end; the lead-out positions of the two wire-in ends are located on one side of the voice coil, and the lead-out positions of the two wire-out ends are located on the other side of the voice coil; the two wire-in ends and the two wire-out ends are electrically connected to the corresponding pads of the circuit board respectively, and the internal circuit of the circuit board is configured to electrically connect the two wire-in ends together, and electrically connect the two wire-out ends together.