Linear Vibration Motor Coil-to-PCB Fixing Structure for Stable Connection
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Solution Overview
Problem
Existing linear vibration motors suffer from instability in the connection between the flexible printed circuit board and the coil, leading to disconnection and reduced reliability.
Innovation Solution
The integration of a fixing member on the iron core, which is molded with the coil, provides a stable connection between the coil and the flexible printed circuit board, enhanced by a positioning hole and notch system, and an isolation portion to ensure dielectric insulation, thereby improving the motor's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coil directly connects with the flexible printed circuit board without any medium, then the device complexity is reduced, but the fixation stability between the coil and the flexible printed circuit board is insufficient, resulting in disconnection and lower reliability
Solution Approach 1:
The patent introduces a fixing member as an intermediary component between the coil and the flexible printed circuit board. This fixing member includes a positioning portion that extends into a positioning hole on the flexible printed circuit board, and a connecting portion that receives the coil. This intermediary structure provides stable fixation while maintaining reasonable device complexity.
Solution Approach 2:
The fixing member is divided into distinct functional portions: a positioning portion for securing the flexible printed circuit board, a connecting portion for holding the coil, and an isolation portion for dielectric insulation. This segmentation allows each portion to perform its specific function effectively, improving overall connection stability.
2Reliability
If the fixing member includes positioning portion and connecting portion, then the fixation stability is improved, but the device complexity increases
Solution Approach 1:
The fixing member merges multiple functions into a single integrated component: positioning, connecting, and isolation functions are all combined in one piece. This merging approach improves fixation stability while minimizing the increase in device complexity by using one component instead of multiple separate parts.
Solution Approach 2:
The fixing member serves multiple purposes simultaneously: it positions the flexible printed circuit board, connects the coil, and provides dielectric insulation. This multi-functionality reduces the need for additional components, balancing improved reliability with controlled device complexity.
3Manufacturing precision
If the coil and iron core are integrated by injection molding, then the manufacturing precision is improved, but the ease of manufacture may be affected
Solution Approach 1:
The integration of the coil and iron core through injection molding creates a composite structure where the coil is embedded in the iron core material. This approach achieves high manufacturing precision for the integrated components while using conventional injection molding technology, maintaining ease of manufacture.
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 enhances the stability and reliability of the linear vibration motor by preventing coil disconnection and ensuring effective dielectric insulation, resulting in improved performance and durability.
Implementation Method 1
One of the vibrator and the stator includes a coil and the other includes a magnet. The elastic member suspends the vibrator in the housing. The flexible printed circuit board provides power supply for the coil to actuate the vibrator.
Data Source
AI summary
The present disclosure discloses a linear motor including a housing with an accommodation space, a vibrator, a stator, an elastic member and a flexible printed circuit board; the vibrator includes an iron core with an axis direction, a coil wounded around the iron core and a fixing member fixed on the iron core; the flexible printed circuit board is fixed on the fixing member. The fixing member serves as a bridge between the coil and the flexible printed circuit board, thus improving the fixation stability between the coil and the flexible printed circuit board and effectively avoiding disconnection of the coil.