Negative Lens Optical System Aberration Correction
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Solution Overview
Problem
Existing optical systems face challenges in achieving optimal optical performance, particularly in correcting aberrations such as curvature of field, astigmatism, and distortion, while maintaining a compact design and wide field angle.
Innovation Solution
The optical system comprises, in order from the object side, a first negative lens, a second negative lens, and a rear group, with specific conditional expressions governing the focal lengths, refractive indices, and total field angle to achieve balanced optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical system uses conventional lens configurations to correct aberrations, then aberration correction improves, but the system becomes larger and loses compactness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths, refractive indices, and curvature radii of the first and second negative lenses according to specific conditional expressions. This allows the optical system to achieve effective aberration correction while maintaining a compact total length, resolving the contradiction between correction performance and system size.
Solution Approach 2:
The patent uses composite lens designs combining negative lenses with specific refractive indices and curvature characteristics. By compositeing multiple lens elements with different optical properties according to the conditional expressions, the system achieves superior aberration correction in a compact configuration.
2Area of moving object
If the optical system increases field angle for wide-angle imaging, then field angle improves, but aberrations such as curvature of field and astigmatism worsen
Solution Approach 1:
The patent employs parameter changes by optimizing the focal lengths and refractive indices of the negative lenses according to specific conditional expressions. This enables the system to achieve a wide field angle (2ω ≥ 60°) while effectively controlling field curvature and astigmatism aberrations through precise parameter control.
Solution Approach 2:
The patent applies local quality by using negative lenses with specific refractive indices and curvature characteristics at different positions in the optical path. The first and second negative lenses have differently optimized parameters to locally address specific aberration types while maintaining overall wide-angle performance.
3Device complexity
If the optical system reduces the number of lens elements for compactness, then system complexity reduces, but aberration correction capability deteriorates
Solution Approach 1:
The patent applies parameter changes by maximizing the optical effectiveness of each lens element through precise control of focal lengths, refractive indices, and curvature radii. The conditional expressions ensure that each negative lens contributes optimally to aberration correction, achieving effective correction with fewer elements and reduced system complexity.
Solution Approach 2:
The patent uses composite lens designs where each element is carefully engineered with specific refractive indices and curvature characteristics. By compositeing the first and second negative lenses with optimized parameters, the system achieves comprehensive aberration correction capability despite having a reduced number of elements.
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 corrects various aberrations, ensures a wide field angle, and maintains a compact optical system, enhancing the overall imaging performance for light of specific wavelengths.
Implementation Method 1
a first negative lens having negative refractive power, a second negative lens having negative refractive power
Data Source
AI summary
An optical system including, in order from an object side, a first negative lens having negative refractive power, a second negative lens having negative refractive power, and a rear group is configured so as to satisfy the following conditional expressions:5.6<TL/f<13.000.3<f1/f2 <2.1.66<Nave12<2.2080.<2ωwhere TL is the total length of the optical system; f, f1, and f2 are the focal lengths of the optical system, the first negative lens, and the second negative lens, respectively; Nave12 is an average of the refractive indices of the first and second negative lenses; and 2ω is the total field angle of the optical system.