Lens Module Pressing Ring Assembly Precision
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Solution Overview
Problem
Existing lens modules face issues with poor roundness and assembly precision due to burrs in the pressing ring, leading to lower yield rates, as the pressing ring is prone to deflection during assembly.
Innovation Solution
The design incorporates a bumpy-ridge structure on the pressing ring with a boss extending towards the object side, allowing it to be abutted against the lens without matching the outer diameter with the lens barrel, enhancing assembly precision and yield rate, and using a plastic lens with a recessed image-side surface for improved molding and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pressing ring is designed with a simple circular structure abutted against the lens from the image side, then the structure is simple and easy to manufacture, but the outer diameter has burrs causing poor roundness and the pressing ring is easy to deflect during assembly
Solution Approach 1:
The pressing ring is divided into two functional parts: the upper pressing surface that contacts the lens and the lower supporting surface that rests on the lens barrel. This segmentation allows each surface to be optimized independently - the upper surface for precise lens pressing and the lower surface for stable support, eliminating the deflection problem while maintaining manufacturing simplicity
Solution Approach 2:
The pressing ring is designed with a rectangular cross-section instead of a simple circular cross-section. This dimensional change provides a larger moment of inertia, increasing resistance to bending deflection during assembly while the outer diameter remains compatible with the lens barrel for easy manufacturing
2Reliability
If the pressing ring outer diameter is matched with the lens barrel inner diameter for fixation, then the assembly is secure, but burrs in the pressing ring outer diameter cause poor roundness and low assembly precision
Solution Approach 1:
The pressing function is extracted from the outer diameter interface and transferred to the upper pressing surface. By removing the dependency on the outer diameter for pressing function, burrs on the outer diameter no longer affect assembly precision, while the rectangular cross-section provides stable support for reliable fixation
Solution Approach 2:
Different surfaces of the pressing ring are given different qualities: the upper pressing surface has high precision and roundness for lens contact, while the outer diameter is designed with sufficient thickness and rectangular cross-section for structural stability. This local differentiation allows each part to optimize its specific function without compromising overall precision
3Manufacturing precision
If the pressing ring is made with sufficient thickness to prevent deflection, then assembly precision improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The pressing ring uses an asymmetric rectangular cross-section rather than a symmetric circular cross-section. This asymmetric design provides higher moment of inertia for the same material usage, preventing deflection without requiring excessive thickness. The rectangular profile is also easier to manufacture with standard machining processes while maintaining structural integrity
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, a lower surface, an inner connecting surface connecting the upper surface and the lower surface, and an outer connecting surface opposite to the inner connecting surface, the outer connecting surface is abutted against the lens barrel. The lens includes an optical portion and a bearing portion. The bearing portion includes an image-side surface close to the image side. The lens module of the present disclosure can ensure the assembly precision of the pressing ring and improve the yield rate of the lens module.