OIS Camera Module Yoke Structure for Magnetic Interference Control
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Solution Overview
Problem
Miniaturized camera modules in mobile devices face performance deterioration due to self-interference between adjacent camera modules, particularly when using magnet and coil-based optical image stabilization actuators, leading to degraded image quality from hand-shaking instability.
Innovation Solution
A camera module design that incorporates a magnet and coil actuator structure with yokes to minimize magnetic field leakage, allowing for accurate and miniaturized driving while reducing self-interference between adjacent modules, enabling free arrangement and effective optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnet and coil actuator structure is used for miniaturization and accurate driving, then driving accuracy and miniaturization are improved, but magnetic field leakage causes self-interference between adjacent camera modules
Solution Approach 1:
A magnetic shield member (yoke) is introduced as an intermediary component between the magnet and the external environment. This yoke confines the magnetic field lines within its structure, preventing magnetic field leakage into surrounding spaces. The shield member acts as a mediator that contains the useful magnetic field for actuation while blocking harmful magnetic field interference to adjacent camera modules, thus resolving the contradiction between maintaining accurate magnetic actuation and preventing magnetic field leakage.
2Adaptability or versatility
If camera modules are arranged adjacent to each other for improved camera function performance, then camera functionality is enhanced, but self-interference between modules deteriorates performance
Solution Approach 1:
The magnetic shield member (yoke) serves as a spatial mediator that enables close arrangement of multiple camera modules by containing magnetic fields within each module. This shield allows modules to be positioned adjacent to each other for enhanced camera functionality (wide-angle, telephoto, depth cameras) while preventing magnetic field interference between them, thus maintaining operational reliability despite close proximity.
3Volume of moving object
If the yoke is disposed close to the magnet for compact design, then miniaturization is improved, but magnetic field confinement becomes less effective
Solution Approach 1:
The design optimizes the geometric parameters of the yoke, specifically making the thickness of the magnetic shield member greater than the distance between the magnet and the yoke. This parameter relationship ensures that even in a compact configuration, the yoke maintains sufficient magnetic shielding effectiveness. By carefully controlling these dimensional parameters, the design achieves both miniaturization and effective magnetic field confinement.
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 solution significantly reduces magnetic field leakage, enabling accurate and miniaturized camera module operation with reduced self-interference, allowing for improved image stabilization and arrangement of multiple camera modules without performance degradation.
Implementation Method 1
An OIS actuator may move a lens module in a direction, perpendicular to an optical axis direction, to compensate for the involuntary shaking
Implementation Method 2
a yoke formed of a material configured to prevent leakage of a magnetic field may be disposed on the side surface
Data Source
AI summary
A camera module includes a carrier supported on a housing and movable in an optical axis direction, a frame supported on the carrier and movable, relative to the carrier, in a first direction perpendicular to the optical axis direction, and a lens module supported on the frame and movable, relative to the frame, in a second direction perpendicular to the optical axis direction. One of the frame and the lens module is supported such that attractive force acts in one of the first direction and the second direction.