Trapezoidal Magnet Actuator for Miniature Camera OIS
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Solution Overview
Problem
High-end computing devices require miniature cameras with improved optical image stabilization that minimize space while maintaining high image quality, posing challenges in reducing camera component dimensions and enhancing performance.
Innovation Solution
An actuator module for optical image stabilization in cameras, featuring a coil mounting structure with optical image stabilization coils, autofocus coils, a spring assembly, and trapezoidal magnets for magnetic interaction, allowing the lens assembly to move relative to the coil mounting structure, enabling efficient focal adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional magnetic coils are used for optical image stabilization in miniature cameras, then image stabilization function is achieved, but the camera component dimensions increase
Solution Approach 1:
The patent employs trapezoidal-shaped magnets instead of conventional circular or rectangular magnets in the optical image stabilization assembly. This asymmetric geometry allows for optimized magnetic field distribution and more efficient interaction with the OIS coils, achieving superior stabilization performance in a reduced volume configuration
Solution Approach 2:
The patent utilizes a multi-layer stacked configuration where OIS magnets, AF magnets, and pole pieces are arranged in vertical layers. This three-dimensional stacking approach maximizes the use of available space, allowing multiple functional components to coexist in a compact footprint while maintaining effective magnetic field interactions for both optical image stabilization and autofocus operations
2Volume of moving object
If camera components are miniaturized to reduce device size, then space consumption decreases, but image quality and performance deteriorate
Solution Approach 1:
The patent implements localized magnetic field optimization through strategically positioned trapezoidal magnets and pole pieces. Each magnetic component is precisely shaped and positioned to create concentrated, high-intensity magnetic fields exactly where needed for OIS and AF operations, ensuring high-performance image quality within the miniaturized structure
Solution Approach 2:
The patent employs composite magnetic assemblies combining multiple magnet materials and pole piece configurations. The OIS assembly includes trapezoidal magnets with specific magnetic properties, while the AF assembly uses separately optimized magnets, creating a composite structure that delivers superior optical performance in a compact form factor
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 enables superior performance and high image quality in miniature cameras by effectively stabilizing the lens assembly, reducing component size, and optimizing magnetic interactions for precise focal control.
Implementation Method 1
a plurality of trapezoidal magnets affixed to the lens assembly structure for magnetic interaction with one or more of the one or more optical image stabilization coils and the one or more autofocus coils
Data Source
AI summary
Some embodiments provide an actuator module for optical image stabilization of a lens assembly relative to an image sensor in a camera. In some embodiments, the actuator module includes a coil mounting structure. One or more optical image stabilization (OIS) coils is mounted to the coil mounting structure. The actuator module further includes a lens assembly structure configured to hold a lens assembly. One or more autofocus coils is affixed to the lens assembly structure. The actuator module further includes a spring assembly for coupling the coil mounting structure to the lens assembly structure, such that the lens assembly structure is movable relative to the coil mounting structure. The actuator module further includes a plurality of trapezoidal magnets affixed to the lens assembly structure for magnetic interaction with one or more of the one or more optical image stabilization coils and the one or more autofocus coils.