Camera Module Yoke Structure for Magnetic Interference Reduction
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Solution Overview
Problem
Miniaturization of camera modules in mobile communications terminals leads to image quality degradation due to hand-shake instability, and existing OIS actuators using magnets and coils suffer from magnetic interference when multiple camera modules are adjacent, affecting performance.
Innovation Solution
A camera module design that incorporates a yoke structure to prevent magnetic field leakage, allowing for the use of magnets and coils while minimizing interference between adjacent modules, enabling accurate and miniaturized driving of lens modules for autofocusing and shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an OIS actuator using a magnet and a coil is employed for miniaturization and accuracy in driving, then miniaturization and driving accuracy are improved, but magnetic interference between adjacent camera modules increases
Solution Approach 1:
A yoke structure is introduced as an intermediary component between the magnet and the external environment. The yoke confines and guides the magnetic field lines, preventing them from leaking into surrounding space where adjacent camera modules are located. This mediator structure allows the magnet-coil actuator to function while isolating its magnetic field from interfering with neighboring modules.
Solution Approach 2:
The harmful magnetic field leakage is extracted and redirected through the yoke structure. By providing a dedicated magnetic path through the yoke, the magnetic field is taken out from the problematic surrounding space and confined to a controlled path, thereby removing the harmful interference effect while preserving the necessary magnetic field for actuator operation.
2Adaptability or versatility
If multiple camera modules are arranged adjacent to each other, then device functionality is improved, but magnetic field interference between modules increases
Solution Approach 1:
The yoke acts as a magnetic field mediator that enables close arrangement of multiple camera modules by confining each module's magnetic field within its own structure. This allows flexible placement and dense packaging of multiple cameras without the magnetic fields of adjacent modules interfering with each other's operation.
3Volume of moving object
If the camera module is miniaturized, then terminal device size is reduced, but driving force for focusing and shake correction becomes insufficient
Solution Approach 1:
The yoke structure changes the magnetic field distribution parameters, concentrating and intensifying the magnetic flux density in the critical regions between the magnet and coil. This parameter optimization ensures that even in a miniaturized actuator, the magnetic field strength and driving force remain sufficient for effective autofocus and optical image stabilization operations.
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
Significantly reduces magnetic field interference, allowing for the free arrangement of multiple camera modules and securing sufficient driving force for focusing and shake correction, even in slimmed camera module designs.
Implementation Method 1
a yoke disposed on a side surface of the housing that supports the frame, and the yoke may include a material configured to prevent leakage of a magnetic field
Implementation Method 2
The frame is supported on the carrier such that attractive force acts in the at least one direction perpendicular to the optical axis direction
Implementation Method 3
An OIS actuator may move a lens module in a direction, perpendicular to an optical axis direction, to compensate for the involuntary shaking
Data Source
AI summary
A camera module includes a carrier supported on a housing and movable in an optical axis direction, at least one frame supported on the carrier and movable, relative to the carrier, in at least one direction perpendicular to the optical axis direction, and a lens module supported on the frame. The frame is supported on the carrier such that attractive force acts in the at least one direction perpendicular to the optical axis direction.