Segmented Voice Coil Assembly for Loudspeaker Sensitivity
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Solution Overview
Problem
Micro-loudspeakers face challenges in improving acoustic performance due to the distance between the voice coil and magnetic gap, leading to decreased sensitivity and weight increase, and unconnected coils hinder monitoring and control, affecting acoustic performance.
Innovation Solution
A voice coil assembly comprising a main voice coil and a connecting coil, both with self-bonding coatings, positioned close to each other and connected in series or parallel, with the connecting coil having a lower density wire, allowing for improved magnetic induction and heat dissipation, and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance from the dome to the washer is increased to obtain a larger amplitude, then the amplitude increases, but the BL value decreases and sensitivity decreases
Solution Approach 1:
The voice coil is divided into two separate coils: a first voice coil for generating driving force and a second voice coil for monitoring and control. This segmentation allows the first coil to be positioned optimally for amplitude while the second coil provides feedback to maintain sensitivity, resolving the contradiction between increased amplitude and maintained sensitivity.
2Strength
If the height of the voice coil is increased to ensure sensitivity and rigid connection, then the connection reliability improves, but the weight increases and sensitivity decreases
Solution Approach 1:
The voice coil system is segmented into a main first voice coil and a lighter second voice coil. The first coil provides the necessary rigid connection and driving force, while the second coil, being lighter, reduces overall weight. The segmentation allows optimization of each coil's function without compromising connection strength while minimizing weight penalty.
3Ease of manufacture
If an unconnected coil is used to form the voice coil, then manufacturing is simplified, but monitoring and control capability is lost, affecting acoustic performance
Solution Approach 1:
The voice coil is segmented into two independently wound coils rather than using a single unconnected coil. This segmentation enables the second coil to serve as a monitoring and control element, providing feedback signals for acoustic performance optimization while maintaining manufacturing simplicity through separate winding processes.
Solution Approach 2:
The second voice coil functions as a monitoring coil that provides feedback signals about the voice coil's position and movement. This feedback capability enables active control of the voice coil system, improving acoustic performance by allowing real-time adjustments, while the separate winding maintains manufacturing ease.
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 configuration increases the magnetic induction (BL) value, stabilizes vibration, reduces weight, and enhances acoustic performance by minimizing asymmetrical vibrations and distortion, thereby improving sound quality and sensitivity.
Implementation Method 1
the first voice coil and the second voice coil are positioned close to each other and bonded together by the self-bonding coatings of the first wire and the second wire
Implementation Method 2
the connecting coil and the first voice coil are positioned close to each other and bonded together by the self-bonding coatings of the third wire and the first wire
Implementation Method 3
the main voice coil is provided in a magnetic gap of the magnetic circuit system
Data Source
AI summary
Disclosed are a voice coil assembly and a loudspeaker, comprising a main voice coil and a connecting coil connected to the main voice coil, the main voice coil is connected to an external circuit, and comprises a first voice coil and a second voice coil, the first voice coil is formed by winding a conductive first wire with self-bonding coating, the second voice coil is formed by winding a second wire with self-bonding coating, the first voice coil and the second voice coil are positioned close to each other and bonded together, the first voice coil and the second voice coil are connected in series or in parallel, the connecting coil is formed by winding a third wire, and the density of the third wire is less than or equal to that of the first wire and the second wire.