Lens Driver With Differential Magnet Spacing for Thin Camera Modules
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Solution Overview
Problem
The challenge is to design a lens driver that can be implemented in a thin form while maintaining sufficient driving force for lens movement, particularly in camera modules of portable electronic devices that are becoming thinner.
Innovation Solution
The lens driver incorporates a coil on a substrate with a sensing portion disposed non-overlapping to the coil's direction, and magnets facing the coil and sensing portion at different distances, along with yokes that secure space for the sensing portion, allowing for efficient lens driving and sensing operations without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lens driver is designed with sufficient driving force for lens movement, then the driving capability is improved, but the thickness increases
Solution Approach 1:
The patent positions the sensing portion in the planar direction (first and second directions) rather than stacking it vertically with the coil, utilizing the third direction (perpendicular to substrate) for magnet placement. This spatial redistribution maintains driving force while reducing thickness by eliminating vertical overlap between sensing and coil components.
Solution Approach 2:
The patent divides the magnetic system into separate first and second magnets positioned at different distances from the substrate, with the sensing portion located between them. This segmentation allows independent optimization of driving force (first magnet closer) and sensing capability (second magnet at appropriate distance), resolving the thickness-force contradiction.
2Measurement precision
If the sensing portion is positioned to overlap the coil, then the sensing capability is improved, but the device complexity and interference increase
Solution Approach 1:
The patent extracts the sensing portion from the coil's magnetic field region by positioning it where it does not overlap the coil in the first and second directions. This separation eliminates electromagnetic interference and simplifies the structure while maintaining sensing capability through the second magnet's field.
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 enables thin form factor while maintaining effective lens driving and sensing capabilities, optimizing space utilization in thinner camera modules.
Implementation Method 1
a coil that is disposed on a substrate, a sensing portion that is disposed to not overlap the coil
Implementation Method 2
a second magnet that faces the sensing portion along the third direction
Data Source
AI summary
A lens driver includes a coil that is disposed on a substrate, a sensing portion that is disposed to not overlap the coil along a first direction and a second direction in which the substrate extends, a first magnet that faces the coil along a third direction that is perpendicular to the first direction and the second direction, and a second magnet that faces the sensing portion along the third direction, wherein a first distance between the substrate and the first magnet and a second distance between the substrate and the second magnet along the third direction are different from each other.