Reduction Optical System Aberration Correction via Parameter Optimization
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Solution Overview
Problem
Existing reduction optical systems for cameras are insufficient in correcting aberrations such as field curvature and astigmatism, and they have limitations in reduction ratio and F-number performance.
Innovation Solution
A reduction optical system with a positive refractive power, comprising multiple positive and negative lenses, is designed to satisfy specific inequalities for focal length, refractive index, and Abbe number, optimizing the reduction ratio and optical performance by sharing refractive power among lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reduction ratio is further reduced, then the reduction ratio performance is improved, but the correction of aberrations (field curvature and astigmatism) becomes insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between lens parameters. The conditional expressions (0.50 < fp1/f < 1.30 and 1.895 < Np1 < 2.20) define optimal ranges for focal length ratios and refractive indices that simultaneously achieve sufficient reduction ratio and effective aberration correction. This quantitative parameter optimization resolves the contradiction by identifying the precise parameter space where both requirements are satisfied.
Solution Approach 2:
The patent employs composite material principles by combining multiple lenses with different refractive indices and Abbe numbers. Specifically, it uses a positive lens with refractive index Np1 and Abbe number νp1, and a negative lens with refractive index Nn1 and Abbe number νn1, creating a composite optical system. This combination allows the system to achieve both the desired reduction ratio and effective correction of field curvature and astigmatism through the synergistic interaction of different optical materials.
2Adaptability or versatility
If the refractive power is increased to improve reduction ratio, then the reduction ratio is improved, but the F-number performance deteriorates
Solution Approach 1:
The patent uses parameter changes to balance reduction ratio and F-number performance. The conditional expression 0.50 < fp1/f < 1.30 optimizes the focal length relationship to achieve adequate reduction while the expression 0.60 < f/F < 1.20 directly controls the F-number range. This dual parameter optimization ensures that the system maintains both sufficient reduction ratio and acceptable illumination intensity without excessive refractive power concentration.
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 system achieves high optical performance by effectively correcting aberrations and providing a sufficient reduction ratio and improved F-number performance, enhancing image quality in cameras.
Implementation Method 1
The reduction optical system has a positive refractive power, and includes a plurality of positive lenses and a plurality of negative lenses
Data Source
AI summary
A reduction optical system (Gr) disposed on an image side of a main optical system is configured such that a composite focal length of the main optical system and the reduction optical system is shorter than a focal length of the main optical system. The reduction optical system has a positive refractive power, and includes a plurality of positive lenses and a plurality of negative lenses. The reduction optical system satisfies inequalities with respect to a lateral magnification of the reduction optical system disposed on the image side of the main optical system, a focal length of the reduction optical system, a focal length of a positive lens Gp1 included in the plurality of positive lenses, and a refractive index of the positive lens Gp1.