Tapered Lens Set Assembly for Optical Axis Alignment
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Solution Overview
Problem
Existing lens units face issues with misalignment of optical axes and air gaps due to tilted assembly of lenses, leading to deteriorated optical performance.
Innovation Solution
A lens set design where the first lens features a radially inward tilted surface that contacts a radially outward tilted surface of a concave portion in the second lens, ensuring precise alignment and assembly, with features like grooves and protrusions to facilitate easy assembly and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear inner circumferential surface and outer circumferential surface are used for press-fitting, then assembly is simple, but optical axis alignment becomes inaccurate
Solution Approach 1:
The patent applies curved tapered surfaces instead of linear surfaces for the press-fitting interface. The inner circumferential surface of the concave portion and the outer circumferential surface of the lens are both formed with tapered curvature, allowing the lens to be guided into precise optical axis alignment during press-fitting while maintaining assembly simplicity.
2Manufacturing precision
If tapered surfaces are used for positioning, then optical axis alignment improves, but assembly complexity increases
Solution Approach 1:
The patent combines the positioning function and the fixing function into a single integrated structure. The tapered inner circumferential surface of the concave portion serves both to guide optical axis alignment and to provide press-fitting fixation, eliminating the need for separate positioning features and reducing overall assembly complexity.
3Manufacturing precision
If press-fitting is applied to fix lenses, then positioning is accurate, but stress concentration occurs
Solution Approach 1:
The tapered curved surfaces distribute the press-fitting stress more evenly across the lens outer circumferential surface compared to linear contact. The gradual curvature reduces stress concentration points, allowing accurate positioning while minimizing the risk of lens deformation or damage.
Data Source
AI summary
A lens set includes a lens and a lens that are adjacent to each other while forming an air gap in an optical axis direction. The lens includes a flange portion. The lens includes a second flange portion and a concave portion provided on an object side of the second flange portion and accommodating the lens. An outer circumferential surface of the flange portion includes a first tapered surface that is tilted radially inward toward an image side. An inner circumferential surface of the concave portion includes a second tapered surface that is tilted radially outward toward the object side. When the lens is accommodated in the concave portion, the first tapered surface contacts the second tapered surface, whereby a position of the lens in the optical axis direction with respect to the lens and a position of a center thereof with respect to the optical axis are determined.