Imaging Lens Design for Distortion and Chromatic Aberration Correction
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Solution Overview
Problem
Existing imaging lenses for miniaturized imaging apparatuses fail to sufficiently correct distortion and lateral chromatic aberration, limiting their performance and size reduction.
Innovation Solution
A miniaturized imaging lens design comprising a first lens group with positive refractive power, a stop, and a third lens group with negative refractive power, where the second lens group moves along the optical axis for focusing, and specific refractive power and dispersion ratio conditions are met to correct distortion and chromatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens system is miniaturized to reduce size, then the imaging apparatus becomes more compact, but distortion and lateral chromatic aberration are not sufficiently corrected
Solution Approach 1:
The lens system is divided into three distinct lens groups (first with positive refractive power, second with positive refractive power, and third with negative refractive power) arranged in sequence from object side to image side. This segmentation allows each group to contribute differently to aberration correction while maintaining a compact overall structure, resolving the contradiction between miniaturization and distortion correction.
Solution Approach 2:
Each lens group is assigned specific optical characteristics and functions: the first lens group provides positive refractive power for basic focusing, the second lens group (containing a cemented lens of positive and negative lenses) specifically addresses chromatic aberration, and the third lens group with negative refractive power corrects distortion. This local optimization of optical properties enables simultaneous achievement of compact size and high correction performance.
2Volume of moving object
If the lens system is miniaturized to reduce size, then the imaging apparatus becomes more compact, but lateral chromatic aberration is not sufficiently corrected
Solution Approach 1:
The lens system is divided into three distinct lens groups (first with positive refractive power, second with positive refractive power, and third with negative refractive power) arranged in sequence from object side to image side. This segmentation allows each group to contribute differently to aberration correction while maintaining a compact overall structure, resolving the contradiction between miniaturization and lateral chromatic aberration correction.
Solution Approach 2:
Each lens group is assigned specific optical characteristics and functions: the first lens group provides positive refractive power for basic focusing, the second lens group (containing a cemented lens of positive and negative lenses) specifically addresses chromatic aberration, and the third lens group with negative refractive power corrects distortion. This local optimization of optical properties enables simultaneous achievement of compact size and high correction performance.
3Manufacturing precision
If more lenses are added to improve aberration correction, then distortion and chromatic aberration are better corrected, but the lens system becomes larger and more complex
Solution Approach 1:
The second lens group employs a cemented lens structure where a positive lens and a negative lens are optically bonded together. This merging of multiple lenses into a single cemented unit reduces the overall number of air-glass interfaces and mechanical mounting requirements, thereby simplifying the device structure while maintaining effective chromatic aberration correction.
Solution Approach 2:
Each lens group is designed to perform multiple functions: the first lens group not only provides positive refractive power for focusing but also contributes to overall aberration control; the second lens group with the cemented lens corrects chromatic aberration while maintaining compact size; the third lens group with negative refractive power corrects distortion. This multi-functionality reduces the need for additional dedicated correction elements, simplifying the overall structure.
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 design achieves miniaturization while effectively correcting distortion and lateral chromatic aberration, enhancing the imaging lens's performance and allowing for a more compact form factor.
Implementation Method 1
a first lens group having a positive refractive power
Implementation Method 2
a second lens group having a positive refractive power, and a third lens group having a negative refractive power
Implementation Method 3
the second lens group includes a cemented lens in which one negative lens and one positive lens are cemented
Data Source
AI summary
The imaging lens consists of, in order from the object side, a positive first lens group, a stop, a positive second lens group, and a negative third lens group. Lenses arranged first and second from the object side are both negative single lenses having convex surfaces toward the object side. The second lens group includes a cemented lens in which a negative lens and a positive lens are cemented. During focusing, only the second lens group moves. Assuming that focal lengths of the first lens group and the second lens group are f1 and f2, respectively, the imaging lens satisfies 0.7<f1/f2<2.