Integrated Lens Drive Layout for AF, OIS, and Aperture Control
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Solution Overview
Problem
Conventional camera modules require separate driving members for auto focus, OIS, and aperture functions, leading to a complex structure.
Innovation Solution
A compact lens driving device using a single driving member that integrates auto focus, OIS, and aperture functions through electromagnetic interaction between coils and magnets, allowing for a unified structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate driving members are used for auto focus, OIS, and aperture functions, then each function can be independently controlled, but the structure becomes complicated
Solution Approach 1:
The patent combines multiple driving members (first driving member for auto focus, second driving member for OIS, third driving member for aperture) into a single integrated driving member. This driving member includes first, second, third, and fourth coils that can generate electromagnetic forces in different directions and planes, enabling simultaneous control of auto focus, OIS, and aperture functions through a unified structure, thereby reducing overall device complexity while maintaining independent function control
Solution Approach 2:
The integrated driving member is designed with multi-functional capability, where the same driving member structure performs multiple functions: the first and second coils handle auto focus and OIS operations, while the third and fourth coils manage aperture control. This universal design allows a single component to replace multiple separate driving members, simplifying the overall lens driving device structure
2Reliability
If multiple separate driving members are used, then each function can be optimized independently, but the device size increases
Solution Approach 1:
The patent employs a nested arrangement where the integrated driving member's coils are positioned in overlapping or adjacent spatial configurations. The first, second, third, and fourth coils are arranged such that they share common magnetic paths and structural support, allowing compact packaging of multiple functional elements within a reduced volume, thereby preventing device size increase despite multi-functional optimization
3Device complexity
If a single driving member is used, then structural complexity is reduced, but controlling multiple functions becomes difficult
Solution Approach 1:
The integrated driving member is segmented into distinct coil sections (first, second, third, and fourth coils), each responsible for specific functional control. This segmentation allows independent electrical control of each coil group while maintaining a unified mechanical structure, making multi-function control straightforward through separate electrical signals applied to each segmented coil section
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 device achieves all three functions with a compact design, enhancing performance and reducing structural complexity.
Implementation Method 1
a first coil, a second coil, a third coil, and a fourth coil disposed on the first housing; a first magnet disposed on the second housing and disposed opposite to the first coil
Implementation Method 2
a second magnet disposed on the bobbin and disposed opposite to the second coil
Implementation Method 3
a third magnet disposed on the bobbin and disposed opposite to the third coil
Implementation Method 4
a fourth magnet disposed on the aperture and disposed opposite to the fourth coil
Data Source
AI summary
A lens driving device includes a first housing; a bobbin disposed in the first housing; an aperture disposed on the bobbin; a board disposed on the first housing; a second coil and a fourth coil disposed on the board; a second magnet disposed on the bobbin and facing the second coil; a fourth magnet disposed on the aperture and facing the fourth coil; and a fourth sensor disposed on the board and configured to sense the fourth magnet. The fourth coil is overlapped with the second coil in a first direction perpendicular to an optical axis direction.