Voice Coil Layout for Stronger Lead-Wire Bonding
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Solution Overview
Problem
The existing voice coil structures in mobile devices suffer from weak bonding strength of inlet and outlet wires due to inadequate support and protection, leading to issues like openings and wire drop, which affect product performance and reliability.
Innovation Solution
A voice coil design with inlet and outlet sections arranged below and above the middle position of arcuate portions in a rectangular ring structure, combined with a discharge plate featuring avoidance holes to prevent direct contact with the discharge plate, enhancing wire bonding strength and preventing wire drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the inlet and outlet wires are placed on the straight edge of the voice coil to save arrangement space, then the arrangement space is reduced, but the bonding strength of the wires becomes weak and wire drop occurs
Solution Approach 1:
The patent moves the inlet and outlet sections from the straight edge (1D line) to the arcuate portion (2D curved surface) of the voice coil. This dimensional change allows the wires to be positioned on a curved surface that provides better structural support and bonding area, thereby increasing bonding strength while still maintaining compact arrangement.
Solution Approach 2:
The patent utilizes the curved surface of the arcuate portion of the voice coil to position the inlet and outlet sections. The curvature provides a naturally stronger bonding surface compared to the straight edge, as the curved geometry distributes mechanical stress more effectively and offers better adhesion area for the wire connections.
2Area of stationary object
If the inlet and outlet wires are placed on the straight edge of the voice coil, then the arrangement space is saved, but the reliability of the voice coil decreases due to wire opening and drop
Solution Approach 1:
By relocating the inlet and outlet sections from the straight edge to the arcuate portion, the patent positions the wires in a location that inherently provides better mechanical support and bonding. This dimensional relocation prevents wire opening and drop, thereby improving reliability while maintaining space efficiency.
Solution Approach 2:
The curved geometry of the arcuate portion provides superior mechanical support for the inlet and outlet wires compared to the straight edge. The curvature distributes mechanical stresses more effectively, preventing wire failure and improving the overall reliability of the voice coil assembly.
3Strength
If the inlet and outlet sections are arranged on the arcuate portion middle position, then the bonding strength increases, but the arrangement complexity increases
Solution Approach 1:
The arcuate portion of the voice coil serves multiple functions: it provides the magnetic field structure, offers mechanical support, and serves as the mounting location for the inlet and outlet sections. By utilizing this multi-functional area, the patent increases bonding strength without requiring additional separate support structures, thereby limiting the increase in complexity.
Data Source
AI summary
The present application provides a voice coil and a voice coil molding assembly, and the voice coil includes a voice coil body wound by a voice coil winding wire, and an inlet section and an outlet section extending from the voice coil body. The voice coil body includes two first straight edges arranged oppositely, two second straight edges arranged oppositely, and four arcuate portions configured to connect the two first straight edges and the two second straight edges. The inlet section and the outlet section are respectively arranged at the middle position of any one of the arcuate sections, and the inlet section and the outlet section are extended out from below and above the voice coil body, respectively. Compared with the related art, the voice coil can effectively avoid the occurrence of voice coil opening and wire dropping, and greatly improve product performance and reliability.