Imaging Lens Moving Structure With Elliptical Rolling Contact
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Solution Overview
Problem
Conventional camera anti-shake mechanisms using ball-type designs suffer from stress concentration at point contacts, leading to friction, debris accumulation, and wear issues.
Innovation Solution
A camera structure utilizing an elliptical moving element with a curved external surface that distributes contact stress across multiple points, reducing friction and wear by allowing the moving element to roll on plane and arc surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ball-type anti-shake design is used, then the anti-shake function is achieved, but stress concentration and wear occur at point contacts
Solution Approach 1:
The patent replaces the conventional ball-type anti-shake mechanism with an elliptical moving element that has a curved external surface. This curved surface design allows the element to roll smoothly between the first and second moving portions while distributing contact stress across a larger area, thereby reducing point contact stress concentration and extending the durability of contact surfaces.
Solution Approach 2:
The patent changes the geometric parameters of the moving element from a spherical ball to an elliptical shape with specific curvature characteristics. The elliptical moving element has a long axis and a curved external surface that provides optimized contact geometry, transforming the contact pattern from point contact to line or area contact, thus reducing stress concentration while maintaining the anti-shake function.
2Ease of operation
If ball-type anti-shake mechanism is used, then movement compensation is achieved, but friction and debris accumulation increase
Solution Approach 1:
The curved external surface of the elliptical moving element enables smooth rolling motion between the moving portions, reducing friction compared to conventional ball contacts. The continuous curved geometry eliminates abrupt contact transitions, thereby reducing debris generation while maintaining effective movement compensation for anti-shake operation.
3Device complexity
If point contact design is used, then structural simplicity is maintained, but contact area is small leading to stress concentration
Solution Approach 1:
The elliptical moving element with its curved external surface naturally increases the contact area with the moving portions compared to point contact balls. The curved geometry distributes the load across a larger contact region, reducing contact stress while maintaining relatively simple structural implementation.
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 effectively disperses stress, reducing friction and extending the lifespan of the moving structure while providing auto-focus and optical image stabilization functions.
Implementation Method 1
the moving element moves along the first surface and the second surface
Implementation Method 2
reducing friction and wear by allowing the moving element to roll on plane and arc surfaces
Implementation Method 3
The first coil is disposed on the base. The first moving assembly includes a first moving body and a first magnet. The first magnet is disposed on the first moving body and the first coil corresponds to the first magnet.
Data Source
AI summary
A camera structure includes a moving structure and an imaging lens. The moving structure includes a first moving portion, a second moving portion, and a moving element. The moving element is disposed between the first moving portion and the second moving portion. The moving element includes two opposite end portions and an external surface positioned there between. The external surface is an arc surface. The first moving portion has a first surface and the second moving portion has a second surface. The external surface of the moving element abuts against the first surface and the second surface respectively. The moving structure is configured such that, when the first moving portion and the second moving portion are displaced relative to each other, the moving element moves along the first surface and the second surface. The imaging lens is displaced by the moving structure.