Lens Driver Coil-Magnet Layout for Thin Camera Modules
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Solution Overview
Problem
The challenge is to design a camera module with a lens driver that is thin enough to fit into increasingly thinner portable electronic devices while maintaining functionality for auto focus, image stabilization, and zoom, without increasing the module's thickness.
Innovation Solution
A lens driver design that incorporates a coil and magnet arrangement on a substrate, with a sensing portion positioned to overlap the magnet's edges, allowing for simultaneous lens driving and sensing operations while minimizing the module's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens driver is designed with conventional coil and magnet arrangement, then the driving force for auto focus and shake correction is sufficient, but the thickness of the camera module increases
Solution Approach 1:
The patent repositions the sensing portion to overlap the edge of the magnet in a direction perpendicular to the conventional arrangement, utilizing three-dimensional spatial optimization to reduce thickness while maintaining functionality
Solution Approach 2:
The magnet is divided into multiple magnet portions with different magnetic poles, allowing independent optimization of each segment's position and function, enabling reduced overall thickness while maintaining driving force
2Measurement precision
If the sensing portion is positioned to overlap the magnet area, then sensing accuracy is improved, but the area occupied by the lens driver increases
Solution Approach 1:
The sensing portion is positioned to overlap only the edge region of the magnet rather than the entire magnet area, concentrating sensing functionality in a localized high-gradient region where magnetic field changes are most pronounced, thereby achieving accurate sensing with minimal area occupation
Solution Approach 2:
The sensing portion is asymmetrically positioned at the edge of the magnet rather than being centrally located, optimizing the sensing region to coincide with the area of greatest magnetic field gradient while minimizing overall footprint
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 design achieves a thin profile for the lens driver, enabling efficient auto focus and shake correction while reducing the overall thickness of the camera module.
Implementation Method 1
a coil, disposed on a substrate, extending in a first direction and a second direction different from the first direction, a magnet disposed to face the coil
Implementation Method 2
a sensing portion disposed to overlap an area outside an edge of the magnet
Data Source
AI summary
A coil, disposed on a substrate, extending in a first direction and a second direction different from the first direction, a magnet disposed to face the coil along a third direction perpendicular to the first direction and the second direction, and a sensing portion disposed to overlap an area outside an edge of the magnet, disposed along the first direction or the second direction, in the third direction.