NFC Coil Assembly Structure for Stable Pad Alignment
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Solution Overview
Problem
The electromagnetic induction coils in NFC devices, made of copper with high elasticity, are prone to bending and misalignment during soldering, leading to low production efficiency and poor yield due to detachment issues.
Innovation Solution
A coil assembly design featuring a supporting member with an extending board and guide grooves that supports and aligns the coil ends with the circuit board pads, using glue and tin layers for fixation and stability, and a magnetic conductive sheet for structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coil is made of copper with high elasticity to reduce cost, then the manufacturing cost is reduced, but the coil is prone to bending and misalignment during soldering
Solution Approach 1:
The patent introduces a supporting member as an intermediary component between the coil and the circuit board. This supporting member includes a supporting ring that holds the coil and an extending board that provides a stable base, preventing the elastic coil from bending during soldering while maintaining cost-effectiveness
Solution Approach 2:
The supporting member is pre-assembled with the coil before the soldering process. This preliminary assembly ensures the coil is properly positioned and stabilized in advance, preventing misalignment during the subsequent soldering operation
2Ease of manufacture
If the coil is made of copper with high elasticity to reduce cost, then the manufacturing cost is reduced, but the coil ends may detach from the circuit board
Solution Approach 1:
The supporting member acts as a mediator that reinforces the connection between the coil ends and the circuit board pads. The extending board provides additional support area that distributes stress and prevents detachment
Solution Approach 2:
The supporting member provides beforehand cushioning by creating a more robust mechanical structure that absorbs and distributes forces during soldering and operation, preventing coil detachment before it can occur
3Quantity of substance
If the coil is made of copper with high elasticity, then the material cost is reduced, but the production efficiency decreases due to low soldering yield
Solution Approach 1:
The supporting member serves as a mediator that enables efficient automated soldering processes by providing a stable, positionable structure for the coil, thereby improving production efficiency while maintaining the use of cost-effective copper material
Solution Approach 2:
The coil is pre-positioned on the supporting member with precise alignment features before mass production soldering. This preliminary positioning ensures high soldering yield in automated production lines, improving overall productivity
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
Improves soldering stability and efficiency, enhances coil alignment, and increases the reliability and durability of the NFC device by preventing bending and detachment of coil ends, thereby improving production quality.
Implementation Method 1
NFC performs data communication based on electromagnetic induction. In the NFC communication, a reader device passes an electric current through a coil, which in turn generates a magnetic field, and the magnetic field then induces an electric current within a tag.
Implementation Method 2
each of an outer side of the first end segment and an outer side of the second end segment is provided with a tin layer
Data Source
AI summary
Provided is a coil assembly and a coil assembly and a coil module. The coil assembly includes a coil, a supporting member, and a circuit board. The supporting member includes a supporting ring and an extending board. The circuit board is arranged on an inner side of the supporting ring. The extending board includes a first end connected to the supporting ring and a second end extends towards the circuit board. The coil is arranged on the supporting ring and has a first end segment and a second end segment which are arranged on the extending board and extend to the circuit board. A first end of the coil is connected to a first pad of the circuit board, and a second end of the coil is connected to a second pad of the circuit board.