Flexible PCB Planar Coil Winding Density for Image Stabilization
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Solution Overview
Problem
Existing camera image stabilization modules experience variations in Lorentz force due to constant coil winding density, affecting the accuracy of image stabilization when a magnet moves.
Innovation Solution
A flexible printed circuit board with a planar coil design where the number of turns is greater on the inside than on the outside of the coil width, reducing Lorentz force variation and maintaining a stable magnetic force during magnet displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If constant coil winding density is used, then manufacturing is simplified, but Lorentz force varies during magnet movement affecting image stabilization accuracy
Solution Approach 1:
The patent applies local quality by varying the coil winding density across different regions of the planar coil. Specifically, the inner region (first region) has a different winding density compared to the outer region (second region), allowing the coil to maintain more stable Lorentz force characteristics during magnet movement while remaining manufacturable through standardized printing processes
2Force
If higher winding density is used throughout the coil, then magnetic force increases, but Lorentz force variation during magnet movement increases
Solution Approach 1:
The patent divides the coil into regions with different winding densities - the inner region has higher winding density to generate sufficient magnetic force, while the outer region has lower winding density to reduce Lorentz force variation during magnet movement. This local differentiation resolves the contradiction between force magnitude and force stability
3Stability of the object's composition
If lower winding density is used throughout the coil, then Lorentz force variation decreases, but magnetic force magnitude decreases
Solution Approach 1:
By implementing different winding densities in different regions, the patent simultaneously achieves adequate magnetic force magnitude (through the inner region's higher density) and reduced Lorentz force variation (through the outer region's lower density), resolving the contradiction between force stability and force magnitude
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 design enhances the accuracy of image stabilization by minimizing Lorentz force variation, allowing for high-performance optical configurations with reduced power consumption and improved camera image stabilization accuracy.
Implementation Method 1
performs image stabilization by using a magnetic force exerted by a coil to drive an imaging device or a correction lens
Implementation Method 2
the magnetic force (Lorentz force) exerted by the coil varies depending on the positional relationship between a magnet and the coil upon a movement of the magnet
Data Source
AI summary
A flexible printed circuit board according to the present disclosures includes a base film having an insulating property, and a planar coil disposed on a surface of the base film, wherein a number of turns on an inside of a center point of a coil width of the planar coil in a plan view is greater than a number of turns on an outside of the center point.