Auto-focus Camera Module Rotation Prevention Mechanism
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Solution Overview
Problem
In camera modules with screwless type lens modules, maintaining the optical axis alignment and adjusting the focal length is challenging due to manufacturing tolerances and limited movement in the optical axis direction, leading to potential tilt and errors in focus adjustment.
Innovation Solution
The camera module design includes a cylindrical insertion unit in the lens module and a carrier with corresponding rotation prevention and insertion adjustment portions, allowing precise engagement and adjustment of the lens module's position to prevent rotation and adjust the focal length mechanically, enabling accurate auto-focus operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a screwless type lens module is used to reduce complexity, then ease of manufacture is improved, but manufacturing precision deteriorates due to difficulty in maintaining optical axis alignment
Solution Approach 1:
The patent introduces an intermediary structure (the carrier with insertion adjustment portions and rotation prevention portions) that mediates between the lens module and camera module. This intermediary enables precise positioning and optical axis alignment without requiring complex screw threads, thus maintaining ease of manufacture while improving manufacturing precision.
Solution Approach 2:
The patent segments the coupling function into distinct components: the carrier with insertion adjustment portions for positional adjustment and rotation prevention portions for rotational constraint. This segmentation allows each component to perform its specific function effectively, resolving the contradiction between ease of manufacture and manufacturing precision.
2Device complexity
If the lens module movement distance is reduced for miniaturization, then device complexity is reduced, but reliability deteriorates due to limited focus adjustment range
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the lens module position during assembly using the insertion adjustment portions. This allows the system to start with an optimized initial position, ensuring reliable focus adjustment within the limited movement distance available in miniaturized camera modules.
3Manufacturing precision
If manual adjustment of lens module insertion depth is used to correct focal length errors, then manufacturing precision is improved, but ease of operation worsens
Solution Approach 1:
The patent implements self-service by designing the insertion adjustment portions to allow automatic or semi-automatic adjustment of the lens module insertion depth. The structure enables the system to self-correct focal length errors through mechanical engagement features, improving ease of operation while maintaining manufacturing precision.
Data Source
AI summary
An electronic device includes an auto-focus camera module. The auto-focus camera module comprises a lens module equipped with at least one lens and including an cylindrical insertion unit formed therein; and a carrier formed with a hollow portion, into which the insertion unit of the lens module is inserted in an optical axis direction of the lens, wherein the lens module includes a first rotation prevention portion, the carrier includes a second rotation prevention portion formed at a position corresponding to the first rotation prevention portion, and in a state where the insertion unit of the lens module is inserted into the hollow portion of the carrier, the first rotation prevention portion and the second rotation prevention portion are engaged with each other so as to prevent the lens module from being rotated with respect to the carrier.