Camera Module Lens Drive Layout for Dual OIS Magnetic Isolation
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Solution Overview
Problem
Dual camera modules experience mutual magnetic field interference due to narrow distances between camera modules, affecting the performance of lens driving devices in dual OIS systems, and there is a need to secure the magnetic force for AF driving.
Innovation Solution
The design includes a connecting portion between coil units, strategically positioned magnets with different polarities, and a dummy member to minimize magnetic interference, with the coil units facing specific magnet surfaces and the bobbin being moved along the optical axis, while the housing is moved perpendicular to the optical axis, ensuring secure magnetic force for AF driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dual camera modules are arranged side by side with narrow distances, then the device size is reduced, but mutual magnetic field interference occurs affecting lens driving performance
Solution Approach 1:
A magnetic shield plate is introduced as an intermediary component between the first and second camera modules. This shield plate selectively blocks magnetic field lines from the second camera module, preventing them from interfering with the lens driving device in the first camera module, thus resolving the magnetic interference issue while maintaining compact dual-camera arrangement
Solution Approach 2:
The magnetic shield plate is strategically positioned only in the region where magnetic field interference occurs between the two camera modules. This localized shielding approach addresses the specific interference problem area without requiring complete shielding of the entire device, optimizing both interference reduction and space utilization
2Volume of moving object
If magnets are positioned close together in dual OIS system, then device compactness is improved, but magnetic force for AF driving is insufficient
Solution Approach 1:
The magnetic shield plate serves as a mediator that directs and concentrates magnetic field lines. By blocking stray magnetic fields, it ensures that the magnetic force required for autofocus driving remains sufficient even when magnets are positioned closely together, thus maintaining both compactness and driving force
Solution Approach 2:
The magnetic shield plate extends in the width direction of the device, creating a three-dimensional magnetic field management structure. This spatial arrangement allows the shield to effectively manage magnetic field distribution across multiple dimensions, ensuring adequate magnetic force for AF while maintaining compact design
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 and secures the magnetic force required for autofocus driving, enhancing the performance of dual OIS systems by optimizing the magnetic field distribution and mechanical assembly.
Implementation Method 1
a magnet disposed in the housing and facing the first coil; the first coil comprises a plurality of coil units; the plurality of coil units may comprise a first coil unit facing the second magnet unit and a second coil unit facing the third magnet unit
Implementation Method 2
a first coil disposed in the bobbin; the first coil comprises a plurality of coil units; the first magnet unit, the second magnet unit, and the third magnet unit may move the housing in a direction perpendicular to the optical axis direction
Data Source
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AI summary
The present embodiment relates to a lens driving device comprising: a housing; a bobbin disposed in the housing; a magnet and a dummy member, arranged at the housing; a first coil disposed on the bobbin; and a substrate comprising a second coil facing the magnet, wherein the housing comprises a first and a second side part facing each other and a third and a fourth side part facing each other, the magnet comprises a first magnet unit disposed at the first side part, a second magnet unit disposed at the third side part, and a third magnet unit disposed at the fourth side part, and the dummy member is disposed at the second side part.