Single-Focal Lens Aberration Correction via Power Distribution
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Solution Overview
Problem
Existing single-focal lens systems face challenges in achieving a wide angle while effectively correcting various aberrations, particularly distortion and astigmatism, due to limitations in the power distribution and curvature of lens elements.
Innovation Solution
A single-focal lens system configuration with a first lens group having negative power and a second lens group with positive power, where the focal length ratio and curvature ratios of lens elements are optimized to achieve a wide viewing angle exceeding 100 degrees, while ensuring favorable aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide angle lens is designed with multiple lens elements to achieve a wide viewing angle, then the angle of view increases, but distortion aberration and astigmatism worsen
Solution Approach 1:
The lens system is divided into multiple lens elements with specific positive and negative powers arranged in a particular sequence. This segmentation allows each element to contribute differently to the overall optical function, enabling wide angle achievement while controlling aberrations through the combined effect of individual elements.
Solution Approach 2:
The lens system employs asymmetric power distribution among lens elements, with specific elements having positive power and others having negative power. The asymmetric arrangement of these elements with different curvatures enables the system to achieve wide angle while correcting distortion and astigmatism through compensatory optical effects.
2Volume of moving object
If lens elements are designed with high curvature to achieve compact size, then the lens system becomes more compact, but aberration correction becomes more difficult
Solution Approach 1:
Different lens elements are assigned different local optical properties, including varying curvatures, refractive powers, and positions. This local quality differentiation allows the compact lens system to achieve aberration correction through the coordinated contribution of elements with optimized local characteristics rather than requiring uniform high curvature throughout.
Solution Approach 2:
The lens system utilizes precise control of optical parameters including focal lengths, curvature ratios, and spacing between elements. By optimizing these parameters within specific ranges, the system achieves compact size while maintaining effective aberration correction through the balanced contribution of positive and negative power 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
The optimized lens system achieves a wide viewing angle while maintaining excellent optical performance by effectively correcting various aberrations, including distortion and astigmatism, through precise control of focal lengths and curvature ratios of lens elements.
Implementation Method 1
a first lens serving as a negative lens, a second lens serving as a meniscus lens whose convex surface is directed to an image, a diaphragm, a third lens serving as a positive lens, a fourth lens serving as a positive lens, and a fifth lens serving as a positive lens
Data Source
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AI summary
A single-focal lens system includes a first lens group having positive power, an aperture diaphragm, and a second lens group having positive power, in this order from an object side to an image side. The first lens group includes a first lens element having negative power, a second lens element having negative power, and a third lens element having positive power in this order from the object side to the image side. The second lens group includes a fourth lens element having power and a fifth lens element having positive power. When fG1 is a focal length of the first lens group at a d-line, fG2 is a focal length of the second lens group at the d-line, and w is a half angle of view, a condition (1) and a condition (6) shown below are satisfied. 0.5<fG1/fG2<3.0 60<w With this configuration, a single-focal lens system capable of favorably correcting various aberrations can be provided.