Dual Camera Magnet Layout for OIS Alignment and EMI Shielding
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Solution Overview
Problem
Dual camera modules suffer from magnetic interference issues, where the magnet of an Optical Image Stabilization (OIS) camera module is disengaged from its normal position due to the magnetic influence of an Auto Focus (AF) camera module, and Electromagnetic Interference (EMI) affects nearby peripheral devices.
Innovation Solution
A dual camera module design featuring a first camera module with a first magnet unit and a second camera module with a second magnet unit, where the third magnet unit is strategically placed between the first and second magnets to minimize magnetic interference, and shield members are used to shield magnetic forces and EMI, ensuring the OIS camera module remains aligned and reducing interference with peripheral devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an AF camera module and an OIS camera module are arranged in parallel in a dual camera module, then the dual camera module can provide both auto focus and optical image stabilization functions, but the magnet of the OIS camera module becomes disengaged from its normal position due to magnetic influence from the AF camera module
Solution Approach 1:
A magnetic shielding member is introduced as an intermediary component between the AF camera module and the OIS camera module. This shielding member blocks the magnetic field lines from the AF module, preventing them from reaching and displacing the magnet in the OIS module, thus maintaining proper magnet positioning while allowing both camera modules to function
Solution Approach 2:
The magnetic shielding function is extracted as a separate component (magnetic shielding member) rather than being integrated into the camera module structures. This allows the shielding function to be independently optimized and positioned to effectively block magnetic interference without affecting the optical paths or mechanical structures of either camera module
2Adaptability or versatility
If the AF camera module and OIS camera module are arranged in parallel, then both functions are provided, but EMI generated from the dual camera module affects nearby peripheral devices such as receivers
Solution Approach 1:
The magnetic shielding member acts as a mediator that not only blocks magnetic fields but also provides EMI shielding for peripheral devices. By positioning the shielding member between the dual camera module and nearby receivers or other sensitive components, electromagnetic interference is reduced, allowing peripheral devices to function normally alongside the dual camera system
Solution Approach 2:
The harmful magnetic fields and EMI generated by the dual camera module are redirected and contained by the magnetic shielding member. Instead of allowing these fields to displace magnets and interfere with peripheral devices, the shielding member channels and contains the electromagnetic energy, converting a harmful effect into a controlled field distribution that maintains system functionality
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 effectively minimizes magnetic interference between the AF and OIS camera modules, maintaining the OIS camera module's alignment and reducing EMI impact on peripheral devices, allowing for optimal operation and signal reception.
Implementation Method 1
a first coil disposed at the first bobbin to mutually and electromagnetically interact with the first magnet unit
Implementation Method 2
a second coil disposed at the second bobbin to mutually and electromagnetically interact with the second magnet unit
Implementation Method 3
a third magnet unit is disposed on a side surface of the first housing facing the second housing, and the third magnet unit is disposed between the first magnet and the second magnet
Data Source
AI summary
The present embodiment relates to a dual camera module comprising a first camera module and a second camera module, wherein: a first magnet unit of the first camera module includes a first magnet and a second magnet, both disposed opposite to each other on a side surface of a first housing; a second magnet unit of the second camera module includes a third to a sixth magnet arranged on four respective corners of a second housing; a third magnet unit is disposed on a side surface of the first housing facing the second housing; the third magnet unit is disposed between the first magnet and the second magnet; and the third magnet unit is smaller than the first magnet and is disposed on a virtual line connecting an optical axis of the first camera module and an optical axis of the second camera module.