Segmented Voice Coil for Mid-Frequency Performance
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Solution Overview
Problem
Existing voice coils in sounding devices face a trade-off between driving force and weight, where increasing the driving force requires thicker wires, leading to increased weight and compromised mid-frequency performance due to the vibration system's weight increase.
Innovation Solution
A voice coil design featuring at least two sub coils with incoming and outgoing wire ends welded together to form a single current path, allowing for a lighter weight wire with greater resistance, achieved through stacking or sleeving the sub coils and potentially using different materials, connected via leads and pads for improved support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a thicker wire is used to wind the voice coil to reduce wire resistance and increase current, then the driving force increases, but the weight of the voice coil increases, resulting in poor mid-frequency performance
Solution Approach 1:
The voice coil is divided into multiple sub-coils wound with different wire specifications. Thinner wires with higher resistance are used in certain segments, allowing the overall coil to achieve the required driving force through optimized current distribution while reducing total weight compared to using uniformly thick wire throughout.
Solution Approach 2:
Different parts of the voice coil use different wire thicknesses tailored to local requirements. The patent specifies that sub-coils can use wires with different specifications, allowing thinner wires to be used where high current is not critical, thereby reducing weight in those regions while maintaining adequate driving force where needed.
2Power
If a thicker wire is used to wind the voice coil to reduce wire resistance, then the current increases for a given voltage, but the mid-frequency performance deteriorates due to increased vibration system weight
Solution Approach 1:
The voice coil is segmented into multiple sub-coils with different wire specifications, allowing optimization of power distribution across different frequency ranges. Thinner wires in certain segments reduce weight and improve mid-frequency response, while the overall configuration maintains adequate power output through the combined effect of all segments.
Solution Approach 2:
The patent changes the wire resistance parameter by using thinner wires with higher resistance in certain sub-coils. This parameter change allows for reduced weight and improved mid-frequency performance while the overall voice coil design compensates to maintain sufficient power output through optimized winding configurations and magnetic circuit design.
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
This design reduces the weight of the vibration system while maintaining driving force, enhancing mid-frequency performance by allowing for a wire with lighter weight and greater resistance.
Implementation Method 1
If F denotes the driving force of the voice coil, then F=B*L*I, where, B denotes the electromagnetic induction intensity of the magnetic circuit system
Implementation Method 2
The incoming wire ends of the at least two sub coils are welded together to form an incoming area on the coil body. The outgoing wire ends of the at least two sub coils are welded together to form an outgoing area on the coil body.
Data Source
AI summary
Disclosed are a voice coil and a sounding device using the voice coil. The coil body includes at least two sub coils fixed together in sequence. Each sub coil is provided with an incoming wire end and an outgoing wire end, and forms only one current path from the incoming wire end to the outgoing wire end and flowing in the same direction. The incoming wire ends of the at least two sub coils are welded together to form an incoming area on the coil body. The outgoing wire ends of the at least two sub coils are welded together to form an outgoing area on the coil body. The voice coil and the sounding device can select a wire with a lighter weight and a greater resistance, thereby decreasing a weight of a vibration system of the sounding device and improving a mid-frequency performance of the sounding device.