Optical Element Driving Mechanism for Compact Camera Modules
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Solution Overview
Problem
Existing camera module driving mechanisms fail to achieve sufficient miniaturization while maintaining strong driving capabilities, particularly in electronic devices like smartphones, which require both auto-focusing and optical image stabilization.
Innovation Solution
An optical element driving mechanism comprising a fixed assembly, a movable assembly, and a driving assembly with a first coil group, a magnetic module, and a circuit assembly, where the magnetic module is sequentially connected to different coils to generate an electromagnetic driving force, allowing for increased range of motion and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If existing driving mechanisms are used in camera modules, then auto-focusing and optical image stabilization functions can be performed, but the thickness of electronic devices cannot be reduced sufficiently
Solution Approach 1:
The coil group is divided into multiple independent coils (first coil, second coil, third coil, fourth coil) arranged in different directions. Each coil can be independently controlled to generate electromagnetic force in specific directions, enabling segmented control of the magnetic module's movement in multiple axes simultaneously
Solution Approach 2:
Multiple coils with different directional capabilities are merged into a single integrated driving assembly. The first and second coils provide force in a first direction while the third and fourth coils provide force in a second direction perpendicular to the first, combining multiple driving functions into one compact unit
2Volume of moving object
If the camera module is miniaturized, then electronic devices can be reduced in size, but the driving capability for auto-focusing and optical image stabilization becomes insufficient
Solution Approach 1:
The magnetic module is designed to be movable relative to both the first coil group and the second coil group, enabling dynamic adjustment of the optical element's position. This dynamic capability allows the compact module to achieve full auto-focusing and optical image stabilization functionality through controlled movement rather than requiring larger static structures
Solution Approach 2:
The patent introduces multi-directional coil arrangements where coils are positioned to generate electromagnetic forces in different spatial dimensions. The first coil group and second coil group operate in perpendicular directions, adding dimensional complexity to the driving mechanism within a compact volume, enabling sophisticated control of the magnetic module's position and orientation
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 provides a greater driving force for camera lenses while achieving miniaturization, enabling effective auto-focus and optical image stabilization functions in compact electronic devices.
Implementation Method 1
a first coil group and a second coil group, when the first coil group and the second coil group are provided with electricity, the first coil group and the second coil group can be interacted with the magnetic module to generate an electromagnetic driving force
Data Source
AI summary
An optical element driving mechanism includes a fixed assembly, a movable assembly, a driving assembly and a circuit assembly. The driving assembly is configured to drive the movable assembly to move relative to the fixed assembly. The driving assembly includes a first coil group which has a plurality of first coils and a magnetic module which has a magnetic element and a first conductive element. The circuit assembly includes a first circuit member electrically connected to the first conductive element and a second circuit member electrically connected to the first coils. When the magnetic module is located in different positions relative to the first coil group, the first conductive element is electrically connected to different first coils in sequence, so that the first coil is electrically connected to the first circuit member and the second circuit member, and other first coils remain open.