Compact Wide-Angle Lens System Aberration Correction
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Solution Overview
Problem
Conventional wide-angle photographic lens assemblies with inverse telephoto structures achieve a larger field of view but suffer from excessive length and aberration issues, particularly with only one lens element in the rear group, which hinders image quality and miniaturization.
Innovation Solution
An image lens system comprising multiple lens elements with alternating positive and negative refractive powers, including a first lens element with negative power, a second with positive power, a third with negative power, a fourth with positive power, and a fifth made of plastic with negative power, featuring specific surface curvatures and aspheric shapes to correct aberrations and maintain a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional wide-angle lens assembly with inverse telephoto structure and only one lens element in the rear group is used, then the field of view is enlarged, but the total length becomes excessive and aberration correction is insufficient
Solution Approach 1:
The rear lens group is segmented into multiple lens elements (at least two lens elements) instead of using a single lens element. This segmentation allows for better aberration correction while maintaining a compact total length, resolving the contradiction between field of view enlargement and excessive length
Solution Approach 2:
Different lens elements in the rear group are assigned specific functions: some elements focus on correcting spherical aberration, others on coma, and others on astigmatism. This local specialization of optical functions enables effective aberration correction within a compact structure, addressing both the field of view requirement and length constraint
2Area of stationary object
If a conventional wide-angle lens assembly with inverse telephoto structure and only one lens element in the rear group is used, then the field of view is enlarged, but image quality deteriorates due to insufficient aberration correction
Solution Approach 1:
The rear lens group is divided into multiple lens elements, each responsible for correcting specific types of aberrations. This segmentation enables comprehensive aberration correction including spherical aberration, coma, and astigmatism, thereby improving image quality while maintaining a wide field of view
Solution Approach 2:
The patent employs aspheric surfaces on lens elements with specifically designed curvature radii and aspheric coefficients. By changing the surface parameters from simple spherical to complex aspheric shapes, the system achieves superior aberration correction performance, resolving the contradiction between wide field of view and image quality
3Manufacturing precision
If multiple lens elements with alternating positive and negative refractive powers are used, then aberration correction is improved, but device complexity increases
Solution Approach 1:
Each lens element is designed with specific local optical properties: some elements have positive refractive power for convergence, others have negative refractive power for divergence. This local differentiation of optical characteristics enables systematic aberration correction across the entire lens system while maintaining a manageable structure
Solution Approach 2:
The patent uses asymmetric aspheric surface designs on lens elements rather than symmetric spherical surfaces. This asymmetry allows for more effective correction of off-axis aberrations and distortion, improving image quality across the entire field of view while keeping the overall system complexity manageable through optimized surface profiles
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 solution provides a compact wide-viewing-angle lens system with improved image quality by correcting aberrations and maintaining a short total length, enhancing resolution and field of view while minimizing photosensitivity and manufacturing complexities.
Implementation Method 1
a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power
Data Source
AI summary
An image lens system includes, in order from an object side to an image side, a first lens element with negative refractive power including a concave image-side surface; a second lens element with positive refractive power including a convex object-side surface; a third lens element with negative refractive power including an object-side surface and a concave image-side surface, the object-side surface and the image-side surface being aspheric; a fourth lens element with positive refractive power including a convex object-side surface and a convex image-side surface; and a fifth lens element with negative refractive power including a convex object-side surface and a concave image-side surface, the object-side surface and the image-side surface being aspheric, the fifth lens element having at least one inflection point.