Pressing Ring Segmentation for Lens Module Assembly Precision
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Solution Overview
Problem
Existing lens modules face issues with poor roundness of the pressing ring due to burrs, leading to assembly precision problems and a low yield rate, as the pressing ring is prone to deflection during assembly.
Innovation Solution
The design incorporates a bumpy-ridge structure on the pressing ring with specific surfaces abutting the lens, eliminating the need for diameter matching with the lens barrel, enhancing assembly precision and yield rate, and using a plastic lens with a bearing portion and shades to improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pressing ring uses outer diameter matching with the lens barrel for fixation, then the lens can be fixed in the lens barrel, but the pressing ring has poor roundness due to burrs and is easy to deflect during assembly, resulting in low assembly precision
Solution Approach 1:
The pressing ring is divided into multiple independent clamping portions (first clamping portion, second clamping portion, third clamping portion) that separately engage with the lens barrel. Each clamping portion has its own clamping surface that contacts the lens barrel independently, distributing the clamping force and preventing deflection during assembly. This segmentation allows each portion to be manufactured separately with better dimensional control, improving roundness and reducing the impact of burrs on overall assembly precision.
Solution Approach 2:
The clamping surfaces of the pressing ring are designed with specific local geometric features including inclined surfaces and arc surfaces. The inclined surfaces provide gradual engagement with the lens barrel during assembly, while the arc surfaces ensure point contact that maintains roundness. These localized quality improvements at the clamping interfaces enable precise assembly without requiring perfect roundness of the entire pressing ring outer diameter.
2Manufacturing precision
If the pressing ring is designed with simple ring structure, then the device complexity is low, but the assembly precision is insufficient due to deflection during assembly
Solution Approach 1:
The pressing ring structure is segmented into multiple clamping portions with distinct functional surfaces. Each clamping portion includes specific inclined surfaces and arc surfaces that provide precise geometric engagement with the lens barrel. This segmentation transforms a simple ring into a multi-functional component where each segment performs a specific clamping function, achieving high assembly precision through distributed, controlled contact points rather than relying on overall ring rigidity.
Solution Approach 2:
The pressing ring design incorporates three-dimensional surface features including inclined surfaces that provide gradual engagement and arc surfaces that create precise contact points. By adding these dimensional variations to the otherwise simple ring structure, the design achieves high assembly precision without significantly increasing overall structural complexity. The 3D surface geometry enables self-alignment and precise positioning during assembly.
Data Source
AI summary
The present disclosure discloses a lens module. The lens module includes a lens barrel, a lens, and a pressing ring abutted against the lens from an image side. The pressing ring includes an upper surface close to an object side, a lower surface, an inner connecting surface, and an outer connecting surface. The outer connecting surface is abutted against the lens barrel, the upper surface is provided with a boss extending towards the object side. The lens module provided by the present disclosure can ensure the assembly precision of the pressing ring and improve the yield rate of the lens module.