Cemented Lens Alignment via Wavefront Measurement and Adhesive Thickness
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Solution Overview
Problem
Existing cemented lenses with aspherical surfaces face challenges in aligning the aspherical axis with the optical axis due to manufacturing errors, leading to performance deterioration.
Innovation Solution
A manufacturing method that adjusts the relative position of lenses by detecting and aligning the aspherical axis with the optical axis through wavefront measurement, allowing for a thickness distribution of the adhesive to ensure proper alignment and reduce manufacturing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cemented lenses are manufactured with aspherical surfaces, then optical performance can be improved, but manufacturing errors cause misalignment between the aspherical axis and optical axis, leading to performance deterioration
Solution Approach 1:
The invention changes the geometric parameters of the cemented lens system by introducing specific aspherical coefficients (k1, k2, A4, A6) and curvature radii relationships. By carefully controlling these parameters, the design compensates for manufacturing errors and ensures that the aspherical axis aligns with the optical axis, thereby maintaining high optical performance despite conventional manufacturing tolerances
Solution Approach 2:
The invention performs preliminary design optimization by pre-calculating the ideal aspherical surface parameters and curvature radii relationships before manufacturing. This preliminary action establishes a design that is inherently robust against manufacturing errors, ensuring that even with conventional manufacturing precision, the aspherical axis will align with the optical axis
2Manufacturing precision
If the aspherical axis is positionally deviated from the center of the paraxial spherical surface, then alignment adjustment is needed, but this increases manufacturing complexity
Solution Approach 1:
The invention applies local quality by creating an asymmetric adhesive layer thickness distribution that is specifically tailored to the local geometric relationship between the aspherical surface and spherical surface. The adhesive thickness is intentionally varied in the radial direction to compensate for the positional deviation of the aspherical axis, achieving precise alignment without complex manufacturing adjustments
Solution Approach 2:
The invention uses the adhesive layer as an intermediary element to achieve alignment between the aspherical axis and optical axis. By controlling the adhesive thickness distribution, the system mediates the positional deviation and achieves precise alignment without requiring complex mechanical adjustments or repositioning operations
Data Source
AI summary
A cemented lens in which a first cemented surface that is one lens surface of a first lens and a second cemented surface that is one lens surface of a second lens are cemented to each other by an adhesive, in which the second lens has an aspherical lens surface as the other lens surface, in which an aspherical axis of the aspherical lens surface of the second lens coincides with an optical axis of the first lens and is positionally deviated in a radial direction of the second lens with respect to a center of a paraxial spherical surface of the second cemented surface, and a thickness of the adhesive between the first cemented surface and the second cemented surface varies in a direction of the positional deviation.