Electromagnetic Driving Mechanism Magnetic Shielding Dual-Lens Camera
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Solution Overview
Problem
Conventional electromagnetic driving mechanisms in dual-lens camera modules face challenges in achieving high performance and small dimensions due to magnetic interference, which can lead to failure of optical image stabilization and increased processing time for image quality, especially when the lens units are closely spaced.
Innovation Solution
An electromagnetic driving mechanism with a base, holders for optical lenses, a magnetically permeable frame surrounding the first holder, resilient elements connecting the holders to the frame, and electromagnetic driving assemblies using magnets and coils to move the lenses along their optical axes, with shock-absorbing material and modular assembly to reduce assembly tolerance and prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the distance between two lens units is reduced, then the focusing time is reduced and image quality is improved, but magnetic interference between the lens units increases causing electromagnetic driving mechanism failure
Solution Approach 1:
A magnetic shielding structure made of magnetically permeable material is introduced as an intermediary between the first and second lens units. This shielding structure guides and confines the magnetic field lines within the electromagnetic driving assemblies, preventing magnetic field leakage and interference between adjacent lens units while allowing the lens units to be positioned at a small distance for fast focusing.
Solution Approach 2:
The magnetic shielding structure is selectively applied only in the regions where magnetic field interference occurs between lens units, rather than shielding the entire camera module. The shielding is implemented locally around each electromagnetic driving assembly, maintaining magnetic field intensity where needed while blocking interference pathways to adjacent components.
2Volume of moving object
If the distance between two lens units is reduced, then the camera module dimensions are reduced, but magnetic interference causes optical image stabilization failure
Solution Approach 1:
The magnetic shielding structure serves as a mediator that enables close positioning of lens units for compact camera module dimensions while simultaneously protecting the electromagnetic driving mechanisms from magnetic interference, thus maintaining optical image stabilization functionality in the reduced-size design.
Solution Approach 2:
The magnetic shielding structures are nested within the camera module housing and positioned between the lens units, allowing the shielding function to be integrated into the compact overall structure without significantly increasing the external dimensions of the camera module.
3Device complexity
If conventional electromagnetic driving mechanisms are used in dual-lens modules, then the structure is simple, but magnetic interference leads to functional failure and requires complex shielding solutions
Solution Approach 1:
Rather than redesigning the electromagnetic driving mechanisms themselves, the patent introduces magnetic shielding structures as intermediaries that resolve the magnetic interference problem, maintaining the simplicity of the original electromagnetic driving mechanism design while ensuring reliable operation.
Solution Approach 2:
The magnetic field interference problem is extracted and isolated from the electromagnetic driving mechanism system by introducing separate magnetic shielding structures. This allows the electromagnetic driving mechanisms to remain simple while the shielding structures handle the magnetic field management function.
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 enhances magnetic field intensity and uniformity, reduces assembly tolerance, and prevents lens tilting, while the modular assembly process detects failures promptly, reducing costs and improving product reliability and yield.
Implementation Method 1
the frame is affixed to the base, having magnetically permeable material and surrounding the first holder
Implementation Method 2
having magnetically permeable material and surrounding the first holder
Implementation Method 3
The first electromagnetic driving assembly is disposed between the first holder and the frame and driving the first holder to move relative to the base along a direction parallel to an optical axis of the optical lens
Implementation Method 4
shock absorbing material disposed between the frame and the first holder
Implementation Method 5
a resilient element connecting the first holder to the frame
Data Source
AI summary
An electromagnetic driving mechanism is provided for driving two different optical lenses, including a base, a first holder, a frame, a resilient element, a first electromagnetic driving assembly, a second holder, and a second electromagnetic driving assembly. The first and second holders are provided for holding the optical lenses. The frame is affixed to the base, has magnetically permeable material, and surrounds the first holder. The resilient element connects the first holder with the frame. The first electromagnetic driving assembly is disposed between the first holder and the frame to drive the first holder moving relative to the base. The second electromagnetic driving assembly is disposed on an outer side of the second holder to drive the second holder moving relative to the base.