Dual Lens Driving Magnet Layout for Close-Spaced Camera Modules
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Solution Overview
Problem
Dual camera devices experience magnetic field interference due to the proximity of camera modules, making it difficult to reduce the separation distance between their optical axes.
Innovation Solution
A lens driving device with a specific arrangement of magnets and coils, including a third coil facing at least one of the first and second magnets, and Hall sensors positioned to minimize magnetic interference, allowing for closer placement of camera modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two camera devices are deployed in proximity to reduce separation distance, then the device size is reduced, but magnetic field interference occurs between the camera modules
Solution Approach 1:
A non-magnetic material (such as plastic or ceramic) is introduced as an intermediary substance between the magnets of the first and second camera modules. This intermediary blocks or shields the magnetic field interference while allowing the camera modules to be positioned in close proximity, thus reducing the overall device size without suffering from magnetic interference
Solution Approach 2:
The magnetic interference problem is isolated and addressed by removing the harmful magnetic field interaction between the two camera modules. This is achieved by placing non-magnetic materials between the magnets, effectively extracting or eliminating the interference pathway while maintaining the functional magnets for their respective optical image stabilization purposes
2Device complexity
If magnets are positioned close together for compact design, then the device complexity is reduced, but magnetic field interference prevents proper operation
Solution Approach 1:
Non-magnetic materials are placed between the magnets of adjacent camera modules to act as shields or barriers. This allows the magnets to be positioned close together for compact design without causing magnetic field interference that would disrupt the operation of the optical image stabilization function
Solution Approach 2:
The magnetic shielding is applied locally only in the regions where magnetic field interference occurs between adjacent camera modules, rather than requiring complete redesign of the magnet arrangement. This allows compact positioning while maintaining operational reliability through targeted local intervention
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 prevents magnetic field interference and reduces the size of the camera module by minimizing the gap between closed-loop auto focus actuators.
Implementation Method 1
a coil (310, 320) disposed on the bobbin; a magnet (410, 420, 430, 440, 450, 460, 470) disposed to face the coil (310, 320)
Implementation Method 2
a Hall sensor (750, 760) disposed to face the magnet (710, 720)
Data Source
Figure 1
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AI summary
The present embodiment relates to a lens driving device comprising: a housing comprising a first hole and a second hole; a first bobbin disposed in the first hole of the housing; a second bobbin disposed in the second hole of the housing; a first coil disposed on the first bobbin; a second coil disposed on the second bobbin; a first magnet disposed in the housing to face the first coil; a second magnet facing the second coil; and a third magnet disposed between the first coil and the second coil.