Dual Camera Module Magnetic Shielding for OIS Interference
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Solution Overview
Problem
Dual camera modules face challenges in minimizing magnetic interference between magnets, particularly in CLAF OIS actuators, which hinders the reduction of the gap between camera optical axes and affects the performance of AF and OIS functions.
Innovation Solution
The dual camera module design incorporates a specific arrangement of magnets and coils, along with dummy members and sensors, to minimize magnetic interference. This includes a symmetrical structure of three magnets in the CLAF method, separating the AF coil from the first magnet, and using two magnets for OIS driving in the Y-axis direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If two camera modules are disposed side by side with close proximity, then the separation distance between camera optical axes is reduced, but magnetic interference between magnets increases
Solution Approach 1:
A magnetic shielding plate is introduced as an intermediary component between the two camera modules. This shielding plate blocks and redirects magnetic field lines, preventing direct magnetic interference between the magnets of adjacent camera modules while allowing the modules to be disposed in close proximity. The shielding plate acts as a mediator that maintains electromagnetic isolation without increasing the separation distance between optical axes.
2Reliability
If magnets are disposed in dual configuration for OIS function, then optical image stabilization capability is improved, but magnetic field interference between adjacent modules increases
Solution Approach 1:
The magnetic shielding plate serves as a mediator that allows dual magnet configuration for OIS in each camera module while preventing magnetic interference between adjacent modules. The shielding plate is positioned between the modules to block magnetic field lines, enabling each module to maintain its dual magnet OIS configuration without causing or experiencing harmful magnetic interference from neighboring modules.
Solution Approach 2:
The magnetic shielding plate is selectively disposed only in specific regions where magnetic interference occurs between adjacent camera modules, rather than uniformly across the entire structure. This asymmetric placement optimizes the shielding effect where needed while minimizing the impact on the overall compact design and maintaining close proximity between optical axes.
3Adaptability or versatility
If CLAF OIS actuator is used, then optical image stabilization with autofocus integration is achieved, but sensitivity to magnetic field interference increases
Solution Approach 1:
The magnetic shielding plate acts as a protective intermediary that shields the CLAF OIS actuator from external magnetic field interference from adjacent camera modules. This allows the CLAF OIS actuator to maintain its integrated autofocus and optical image stabilization functionality without being adversely affected by magnetic interference, ensuring reliable operation in the dual camera module configuration.
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 effectively minimizes mutual interference between magnets, allowing for a closer placement of camera modules while maintaining balanced electromagnetic forces for accurate AF and OIS performance.
Implementation Method 1
a first coil disposed on the bobbin; a first magnet disposed inside the housing and facing the first coil; a second coil facing the first magnet; a second magnet disposed on the bobbin
Data Source
AI summary
A camera module may comprise a first camera module and a second camera module spaced apart from the first camera module, wherein: the first camera module comprises a cover, a housing, a bobbin, a first coil, a first magnet, a second coil, a second magnet, and a first sensor; the first magnet comprises a first-first magnet disposed at a position corresponding to a second lateral plate, a first-second magnet disposed at a position corresponding to a third lateral plate, and a first-third magnet disposed at a position corresponding to a fourth lateral plate; and a first dummy member and the first sensor are disposed at a position corresponding to a first lateral plate of the cover.