Optical Member Driving System Magnetic Interference Shielding
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Solution Overview
Problem
Conventional dual camera modules experience reduced focusing speed and accuracy due to magnetic interference between magnets in lens driving mechanisms and other components, necessitating a solution to minimize magnetic interference.
Innovation Solution
The camera module incorporates a design with a base, a frame, a lens holder, and strategically placed magnets and coils to generate magnetic forces that move the lens holder relative to the base and frame, reducing magnetic interference by aligning coil and magnet surfaces and using multipolar magnets, and integrating magnets and coils to prevent excessive proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are disposed in lens driving mechanisms of multiple image capturing units, then optical image stabilization and auto focusing functions are enabled, but magnetic interference occurs between magnets reducing focusing speed and accuracy
Solution Approach 1:
A magnetic shield member is introduced as an intermediary component between the first and second image capturing units. This shield member blocks or redirects magnetic field lines, preventing direct magnetic interaction between the magnets of adjacent camera modules while allowing the magnetic fields to still function for driving the lens mechanisms
Solution Approach 2:
The magnetic shield member extends in the depth direction (third direction) between the adjacent image capturing units, creating a three-dimensional barrier that interrupts magnetic field paths without affecting the two-dimensional optical path. This spatial arrangement allows magnetic field management independent of the optical axis
2Volume of moving object
If image capturing units are positioned close to each other in a dual camera module, then compact design is achieved, but magnetic interference between adjacent units reduces lens focusing performance
Solution Approach 1:
The magnetic shield member serves as a spatial intermediary that allows compact positioning of image capturing units while preventing harmful magnetic interactions. The shield creates effective magnetic isolation zones, enabling close placement without performance degradation
3Ease of manufacture
If magnets are positioned close to other components within the same image capturing unit, then miniaturization is achieved, but magnetic interference with other components occurs
Solution Approach 1:
The magnetic shield member is positioned between the magnet and other components within the image capturing unit, acting as a local intermediary that blocks magnetic field lines from reaching sensitive components while allowing the magnet to maintain its driving 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
This design enhances focusing speed and accuracy while minimizing magnetic interference, facilitating miniaturization and cost reduction, and enabling efficient optical image stabilization and auto focusing without compromising performance.
Implementation Method 1
When a first current is applied to the first coil, a first magnetic force is generated between the first magnet and the first coil to move the frame and the lens holder relative to the base
Implementation Method 2
When a second current is applied to the second coil, a second magnetic force is generated between the second magnet and the second coil to move the lens holder relative to the frame
Implementation Method 3
When a third current is applied to the third coil, a third magnetic force is generated between the third magnet and the third coil to move the frame and the lens holder relative to the base
Data Source
AI summary
An image capturing unit is provided, including a base, a frame movably connected to the base, a lens holder movably disposed in the frame for receiving a lens, a first magnet, a first coil, a second magnet, and a second coil. When a current is applied to the first coil, a magnetic force is generated between the first magnet and the first coil to move the frame and the lens holder relative to the base. When a current is applied to the second coil, a magnetic force is generated between the second magnet and the second coil to move the lens holder relative to the frame.