Lens Moving Apparatus Coil Geometry for Magnetic Interference Reduction
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Solution Overview
Problem
Existing camera modules face challenges in reducing magnetic field interference between adjacent lens moving apparatuses, maintaining electromagnetic force balance for OIS function, and minimizing the weight and current consumption of OIS moving units, especially in subminiature and low-power applications.
Innovation Solution
A lens moving apparatus is designed with a specific configuration of magnets and coils, including a bobbin, housing, and coil units, where the width and number of turns of the coils are optimized to reduce magnetic field interference and balance electromagnetic forces, and the use of a dummy member helps in weight reduction and current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the line of the third coil unit is reduced, then magnetic field interference between adjacent lens moving apparatuses is reduced, but the electromagnetic force balance may be affected
Solution Approach 1:
The patent applies local quality by making the line width of the third coil unit (230-3) different from the first and second coil units. Specifically, the third coil unit has a reduced line width compared to the other coil units, creating localized variation in electromagnetic properties. This local modification reduces magnetic field interference in specific directions while maintaining adequate electromagnetic force balance through the coordinated design of all coil units.
2Object-affected harmful factors
If the number of turns of the third coil unit is increased, then magnetic field interference is reduced, but the current consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the number of turns of the third coil unit (230-3) to be greater than the first and second coil units. This parameter modification increases the electromagnetic interaction strength in specific directions, effectively reducing magnetic field interference. The increased number of turns compensates for the reduced line width, maintaining overall electromagnetic force balance while reducing interference with adjacent apparatuses.
3Weight of moving object
If the weight of the OIS moving unit is reduced, then current consumption is reduced, but the electromagnetic force balance may be affected
Solution Approach 1:
The patent applies asymmetry by introducing a dummy member (135) with asymmetric placement and properties. The dummy member is positioned to compensate for weight reduction in the OIS moving unit, maintaining the center of gravity and electromagnetic force balance. This asymmetric compensation allows weight reduction while preserving the necessary force balance for OIS function.
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 solution effectively reduces magnetic field interference, maintains electromagnetic force balance for OIS function, and decreases the weight and current consumption of the OIS moving unit, enhancing the reliability and efficiency of the camera module.
Implementation Method 1
a first coil disposed at the bobbin, and a magnet disposed at the housing, wherein the board includes a second coil opposite the magnet
Implementation Method 2
maintaining balance between electromagnetic force in an X-axis direction and electromagnetic force in a Y-axis direction necessary to perform an OIS function
Data Source
AI summary
A lens moving apparatus includes a substrate; a housing having a first side part and second side part facing each other and a third side part and fourth side part facing each other; a bobbin arranged inside the housing; a first coil arranged on the bobbin; and a magnet arranged in the housing. The substrate includes a second coil facing the magnet. The magnet includes a first magnet arranged on the first side part of the housing, a second magnet arranged on the second side part of the housing, and a third magnet arranged on the third side part of the housing. The second coil includes a first coil unit facing the first magnet, a second coil unit facing the second magnet, and a third coil unit facing the third magnet. The first to third coil units each includes a line having a plurality of turns.