Five-Lens Optical Assembly Aberration Correction
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Solution Overview
Problem
Current lens assemblies face challenges in achieving both miniaturization and high resolution while maintaining good optical performance.
Innovation Solution
A lens assembly comprising a specific arrangement of lenses with varying refractive powers and surface curvatures, including a meniscus, biconcave, and biconvex lenses, optimized to meet conditions such as 10 mm<f3+f4<15 mm and 5<(R11+R12)/(R21+R22)<15, which enhances resolution and corrects aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the device size is reduced, but the resolution capability deteriorates
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first lens L11, second lens L12, third lens L13, fourth lens L14, fifth lens L15) with different refractive powers and surface curvatures. Each lens element is optimized for specific functions: the first lens provides positive refractive power with a convex object-side surface, the second lens provides negative refractive power, the third lens provides positive refractive power with a convex object-side surface, the fourth lens provides positive refractive power, and the fifth lens provides negative refractive power with a concave image-side surface. This segmentation allows the compact assembly to achieve high resolution by correcting various aberrations through the combined action of multiple specialized elements.
Solution Approach 2:
Different lens elements are assigned specific local optical properties to optimize overall performance. The first lens has a convex object-side surface with positive refractive power for initial light convergence. The second lens has negative refractive power for diverging light and correcting spherical aberration. The third lens has a convex object-side surface with positive refractive power for further convergence. The fourth lens has positive refractive power for additional convergence. The fifth lens has a concave image-side surface with negative refractive power for final correction. This local optimization of each element's properties enables the compact assembly to achieve high resolution capability.
2Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the device size is reduced, but the optical performance deteriorates
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first lens L11, second lens L12, third lens L13, fourth lens L14, fifth lens L15) with different refractive powers and surface curvatures. Each lens element is optimized for specific functions: the first lens provides positive refractive power with a convex object-side surface, the second lens provides negative refractive power, the third lens provides positive refractive power with a convex object-side surface, the fourth lens provides positive refractive power, and the fifth lens provides negative refractive power with a concave image-side surface. This segmentation allows the compact assembly to achieve high resolution by correcting various aberrations through the combined action of multiple specialized elements.
Solution Approach 2:
The patent specifies precise parameter ranges to maintain optical performance in the miniaturized assembly. The conditional expression (R11+R12)/(R21+R22) between 5 and 15 controls the relative curvature relationships between the first and second lenses, optimizing aberration correction. The conditional expression 10 mm < f3+f4 < 15 mm controls the combined focal length of the third and fourth lenses, ensuring proper light convergence. The conditional expression −522 < f5/f1 < −2 maintains the ratio between the fifth and first lens focal lengths, ensuring balanced optical performance. These parameter optimizations enable the compact assembly to achieve high resolution capability despite the reduced total lens length.
3Measurement precision
If multiple lenses with varying refractive powers are arranged to improve resolution, then the resolution capability is improved, but the device complexity increases
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first lens L11, second lens L12, third lens L13, fourth lens L14, fifth lens L15) with different refractive powers and surface curvatures. Each lens element is optimized for specific functions: the first lens provides positive refractive power with a convex object-side surface, the second lens provides negative refractive power, the third lens provides positive refractive power with a convex object-side surface, the fourth lens provides positive refractive power, and the fifth lens provides negative refractive power with a concave image-side surface. This segmentation allows the compact assembly to achieve high resolution by correcting various aberrations through the combined action of multiple specialized elements.
Solution Approach 2:
The patent specifies precise parameter ranges to maintain optical performance in the miniaturized assembly. The conditional expression (R11+R12)/(R21+R22) between 5 and 15 controls the relative curvature relationships between the first and second lenses, optimizing aberration correction. The conditional expression 10 mm < f3+f4 < 15 mm controls the combined focal length of the third and fourth lenses, ensuring proper light convergence. The conditional expression −522 < f5/f1 < −2 maintains the ratio between the fifth and first lens focal lengths, ensuring balanced optical performance. These parameter optimizations enable the compact assembly to achieve high resolution capability despite the reduced total lens length.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lens assembly achieves a shortened total lens length, increased resolution, and effective correction of aberrations, meeting the requirements of miniaturization and high optical performance.
Implementation Method 1
The first lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has negative refractive power. The third lens has positive refractive power and includes a convex surface facing the object side. The fourth lens has positive refractive power. The fifth lens has negative refractive power and includes a concave surface facing the image side.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens are arranged in order from an object side to an image side along an optical axis. The first lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has negative refractive power. The third lens has positive refractive power and includes a convex surface facing the object side. The fourth lens has positive refractive power. The fifth lens has negative refractive power and includes a concave surface facing the image side. The lens assembly satisfies 5<(R11+R12)/(R21+R22)<15.