Flexible PCB Coil Layout for Stable Image Stabilization Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera image stabilization modules face challenges in maintaining accurate image stabilization due to variations in Lorentz force caused by the positional relationship between magnets and coils, which is influenced by constant coil winding density.
Innovation Solution
A flexible printed circuit board design with varying coil turn densities, where the number of turns outside the coil center is greater than inside, reducing Lorentz force variation and ensuring stable magnetic force application regardless of magnet displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If constant coil winding density is used, then the coil structure is simple and easy to manufacture, but the Lorentz force varies significantly with magnet position, reducing 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 coil winding density is set to be higher at the center region and lower at the peripheral regions. This non-uniform distribution compensates for the positional variations in Lorentz force, maintaining more consistent stabilization performance across different magnet positions while improving image stabilization accuracy.
2Measurement precision
If coil winding density varies to reduce Lorentz force variation, then image stabilization accuracy improves, but the coil structure becomes more complex
Solution Approach 1:
The patent implements local quality through a graded coil winding density distribution where the density transitions smoothly from the center to the periphery. This approach achieves reduced Lorentz force variation and improved image stabilization accuracy while maintaining a relatively simple planar coil structure that can be manufactured using conventional techniques.
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 flexible printed circuit board provides highly accurate image stabilization by minimizing Lorentz force variation, even with wide camera shake amplitudes, through optimized coil turn distribution.
Implementation Method 1
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
Implementation Method 2
performs image stabilization by using a magnetic force exerted by a coil to drive an imaging device or a correction lens
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 outside 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 inside of the center point.