Wide-Angle Optical System With Segmented Magnification Control
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Solution Overview
Problem
Conventional wide-angle imaging systems face challenges in maintaining uniform image quality across the entire imaging range due to varying magnification between the center and edge portions, leading to image quality deterioration and increased lens thickness.
Innovation Solution
The proposed solution involves combining two wide-angle lenses with magnification per unit angle of view increasing from the center to the edge at a slower rate, allowing for a more uniform image quality across the entire field of view while minimizing lens thickness and preventing unnecessary lens lengthening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnification in the edge portion is increased to compensate for image quality deterioration, then image quality uniformity is improved, but the entire length of the lens system increases
Solution Approach 1:
The lens system is divided into multiple lens units with different magnification characteristics. The first lens unit has higher magnification in the edge portion, while the second lens unit has lower magnification in the edge portion. This segmentation allows each unit to contribute differently to the overall magnification profile, achieving uniform image quality without excessive total length.
Solution Approach 2:
Different regions of the lens system are designed with different magnification properties. The first lens unit provides enhanced edge magnification to compensate for quality deterioration, while the second lens unit provides reduced edge magnification to control overall system length. This local differentiation of optical properties enables simultaneous optimization of image quality uniformity and compactness.
2Length of stationary object
If the magnification per unit angle of view monotonically increases from center to edge, then the entire length is reduced, but the lens thickness is reduced resulting in deterioration of lens performance
Solution Approach 1:
The lens system is segmented into multiple units that collectively achieve the desired magnification profile. Rather than a single lens with monotonically increasing magnification that would be too thin, the system uses multiple lens units where the first unit provides the necessary edge magnification enhancement and the second unit moderates the overall magnification increase, maintaining adequate lens thickness for performance.
3Reliability
If conventional wide-angle lens design is used with equal magnification across directions, then lens thickness is maintained, but image quality deteriorates in the edge portion
Solution Approach 1:
The lens system implements local quality differentiation where the first lens unit is specifically designed to provide higher magnification in the edge portion to compensate for quality deterioration. This localized enhancement of edge magnification, combined with the second lens unit's moderating effect, achieves uniform image quality across the field while maintaining adequate lens thickness for performance.
Data Source
AI summary
An optical system includes a central portion having a magnification per unit angle of view which increases from a center to an outside at an increase rate and a circumferential portion being outside the central portion and having a magnification per unit of view which increases from the central portion to an outside at an increase rate smaller than the increase rate of the central portion.