Dual Camera Module Magnet Layout for Interference Reduction
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Solution Overview
Problem
Magnetic interference occurs between two adjacently disposed camera modules in dual camera setups, affecting their performance.
Innovation Solution
A camera module design that minimizes magnetic force interference between parallel-arranged lens driving devices by using specific magnet arrangements and dummy members with controlled distances and masses, along with eccentric magnet placements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two individual camera modules are adjacently disposed to enable dual camera functionality, then the camera module can capture diverse subjects (improving versatility), but magnetic interference is mutually generated between the two camera modules (worsening reliability)
Solution Approach 1:
A non-magnetic shielding plate is introduced as an intermediary component between the two lens driving devices. This shielding plate blocks the magnetic field lines generated by the magnets in one lens driving device from directly interacting with the coils in the other lens driving device, thereby eliminating mutual magnetic interference while preserving dual camera functionality
Solution Approach 2:
The harmful magnetic field is extracted and redirected through a magnetic field redirecting member. This member is configured to guide the magnetic field lines away from the adjacent lens driving device, preventing magnetic interference while maintaining the necessary magnetic field strength for coil-magnet interaction in each individual lens driving device
2Volume of moving object
If the distance between two lens driving devices is reduced to minimize module size, then the overall camera module size is reduced (improving compactness), but magnetic interference between the lens driving devices increases (worsening reliability)
Solution Approach 1:
The non-magnetic shielding plate serves as a mediator that enables close spacing between lens driving devices without magnetic interference. By placing this shielding plate between the adjacent magnets and coils, the design achieves compact dimensions while the shielding plate prevents direct magnetic field coupling between the closely-spaced components
Solution Approach 2:
The magnetic field that would normally cause interference is converted into a beneficial redirected field pattern. The magnetic field redirecting member transforms the harmful stray magnetic fields into controlled field lines that complete their magnetic circuit within each lens driving device, converting potential interference into useful magnetic flux containment
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
Minimizes magnetic interference and reduces the distance between lens driving devices, enhancing the operational efficiency and reducing electromagnetic interference.
Implementation Method 1
a coil disposed on the bobbin, and a magnet disposed on the housing and facing the coil
Data Source
AI summary
The present embodiment relates to a camera module comprising a first lens driving device and a second lens driving device, wherein a first lateral surface of the first lens driving device faces a second lateral surface of the second lens driving device, a first housing comprises a first lateral part corresponding to the first lateral surface of the first lens driving device and a second lateral part disposed at the opposite side of the first lateral part, a first magnet comprises a first magnet unit disposed in in the first lateral part and a second magnet unit disposed in the second lateral part, each of the first magnet unit and the second magnet unit comprises an inner surface facing a first coil, an outer surface disposed at an opposite side of the inner surface, and both lateral surfaces connecting the inner surface and the outer surface, and the distance between the both lateral surfaces of the first magnet unit is shorter than the distance between the both lateral surfaces of the second magnet unit.