Staggered Voice Coil Layout to Preserve Magnetic Gap Space
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Solution Overview
Problem
The existing voice coils in speaker modules have overlapping winding switching portions that increase the wall thickness, occupying magnetic gap space and reducing sensitivity.
Innovation Solution
A voice coil design with staggered winding layers and non-overlapping winding switching portions, arranged in transition areas to minimize wall thickness and reduce magnetic gap interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If winding switching portions are collectively arranged on the corresponding areas from inside to outside, then the winding structure is simple, but the wall thickness increases and magnetic gap space is occupied
Solution Approach 1:
The patent transitions from arranging winding switching portions in the radial direction (inside to outside) to arranging them in the axial direction (top to bottom of the voice coil). This dimensional change allows the switching portions to be distributed along the height of the voice coil rather than concentrating in the radial space, thereby reducing the wall thickness in the radial direction and preserving magnetic gap space.
Solution Approach 2:
The patent divides the winding switching portions into multiple discrete segments distributed along the axial direction rather than treating them as a continuous radial structure. Each switching portion is separated by spacing in the axial direction, which prevents them from overlapping in the radial direction and reduces the overall wall thickness requirement.
2Ease of manufacture
If winding switching portions are collectively arranged from inside to outside, then the manufacturing process is simple, but the sensitivity of the speaker module decreases
Solution Approach 1:
By repositioning winding switching portions from radial arrangement to axial arrangement, the patent maintains manufacturing simplicity while eliminating the negative impact on sensitivity. The axial distribution of switching portions ensures that the magnetic gap remains uniform and adequate, which is critical for maintaining speaker sensitivity.
3Volume of moving object
If the wall thickness is reduced to minimize magnetic gap occupation, then the magnetic gap space is improved, but the structural stability of the voice coil may be compromised
Solution Approach 1:
The patent compensates for reduced radial wall thickness by utilizing the axial dimension for structural support. The staggered arrangement of winding switching portions along the axial direction creates a distributed support structure that maintains mechanical stability without requiring increased radial thickness.
Solution Approach 2:
The patent employs a nested arrangement where winding layers are staggered and positioned within the space created by the axial distribution of switching portions. This nesting allows the voice coil to maintain structural integrity while minimizing the radial envelope size and magnetic gap occupation.
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 design reduces the impact on the magnetic gap, enhancing the sensitivity and conversion efficiency of the speaker module.
Implementation Method 1
The voice coil is made of an enameled wire, and a conductive core of the enameled wire is made of copper, aluminum, copper-aluminum alloy, or copper-clad aluminum
Data Source
AI summary
The present invention provides a voice coil and a speaker module. The voice coil of the present invention includes a first winding switching portion located between winding layers with different numbers of windings, which is arranged in a transition area of the number of windings of the winding layers. According to the present invention, arranging the first winding switching portion in the transition area of the number of windings of the winding layers can absorb the thickness of the first winding switching portion via the accommodating space, so that the arrangement of the first winding switching portion does not increase the wall thickness of the voice coil, thereby reducing the influence of the voice coil on the magnetic gap and improving conversion efficiency. Applying the voice coil to the speaker module can also improve the sensitivity of the speaker module.