Imaging Optical System Aberration Correction via Lens Group Segmentation
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Solution Overview
Problem
Existing imaging optical systems face challenges in effectively correcting aberrations, particularly field curvature and spherical aberration, across various zoom ranges, which affects image quality.
Innovation Solution
The proposed imaging optical system consists of a configuration with a first lens group having negative optical power, a second lens group with a concave surface, a third lens group, and a fourth lens group with negative optical power, where the lens groups move along the optical axis to adjust distances and correct aberrations, particularly using cemented lenses to manage refractive indices and Abbe numbers for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional zoom lens configuration is used, then the lens can achieve zoom functionality, but it cannot satisfactorily correct field curvature and spherical aberrations across various zoom ranges
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (G1-G5) with specific optical powers, where each group serves a particular function in aberration correction. The fourth lens group G4 is further segmented into multiple lenses with different optical powers arranged in sequence, allowing independent optimization of aberration correction for each segment while maintaining overall zoom functionality.
Solution Approach 2:
Different regions of the optical system are assigned different optical properties: the first lens group G1 has negative optical power for wide-angle correction, the second group G2 has positive power for focal length adjustment, the third group G3 has negative power for aberration balancing, and the fourth group G4 has negative power specifically for field curvature correction. Each lens within G4 is designed with specific optical powers to address particular aberration types locally.
2Length of moving object
If the first lens group is downsized to reduce overall lens size, then compactness is improved, but aberration correction capability may be compromised
Solution Approach 1:
The optical system employs asymmetric distribution of optical power across the five lens groups, with the first lens group G1 having strong negative optical power to provide effective aberration correction in a compact form. The asymmetric arrangement of positive and negative power groups allows the first group to be downsized while maintaining its corrective function through optimized curvature and spacing.
Solution Approach 2:
The lens design optimizes specific parameters including the optical power of each lens group, the spacing between groups, and the curvature radii of individual lenses. By carefully adjusting these parameters, the first lens group can achieve effective aberration correction with reduced size, as the precise parameter optimization compensates for the smaller physical dimensions.
3Manufacturing precision
If multiple lens groups are added to improve aberration correction, then image quality is enhanced, but the device becomes more complex and difficult to manufacture
Solution Approach 1:
The fourth lens group G4 combines multiple lenses with different optical powers into a single integrated group that works together to correct both field curvature and spherical aberrations. By merging these corrective functions into one coordinated group rather than separate components, the design achieves superior aberration correction while simplifying the overall assembly process and reducing the number of independent adjustments needed during manufacturing.
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
This configuration effectively cancels field curvature and spherical aberrations, enhancing image quality across the zoom range while downsizing the first lens group and reducing manufacturing errors, leading to improved picture quality and aberration correction.
Implementation Method 1
a first lens group having negative optical power, a second lens group having positive optical power, a third lens group having negative optical power, and a fourth lens group having negative optical power
Data Source
AI summary
An imaging optical system includes, in order from an object side to an image side, a first lens group having negative optical power, a second lens group having positive optical power, a third lens group having negative optical power, and a fourth lens group with negative optical power. A lens disposed closest to the object side in the second lens group has a concave surface directed toward the object side, and a lens disposed closest to the object side in the fourth lens group has positive optical power. Each distance between the lens groups changes when zooming from a wide-angle end to a telephoto end on photographing.