Six-Element Imaging Lens Aberration Control
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Solution Overview
Problem
Imaging lenses for vehicle cameras and surveillance cameras face challenges in achieving a small F-number, cost reduction, wider angle of view, and improved optical performance while minimizing chromatic aberration across the visible spectrum.
Innovation Solution
The design of a six-element imaging lens with specific power arrangements and material selections, including lenses with negative and positive powers, and the use of aspherical surfaces, to satisfy conditional expressions that optimize curvature radii, Abbe numbers, and focal lengths, ensuring corrected aberrations and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a six-element imaging lens is used, then optical performance is improved, but device complexity increases
Solution Approach 1:
The imaging lens is divided into six distinct lens elements with specific positive and negative powers arranged in a predetermined sequence. This segmentation allows each element to correct specific aberrations independently, achieving superior optical performance while maintaining manageable complexity through systematic design
Solution Approach 2:
Each lens element is assigned specific local properties including particular refractive index ranges and Abbe number ranges. The third lens element, for example, has specifically constrained parameters (1.5 < νd3 < 25) to optimize chromatic aberration correction in that local region of the optical system
2Reliability
If F-number is reduced, then imaging performance is improved, but chromatic aberration increases
Solution Approach 1:
The patent employs precise parameter control of lens materials, specifying refractive index ranges (1.4 < νd2 < 20) and Abbe number ranges for each element. These parameter changes enable the system to maintain low F-number for improved imaging while correcting chromatic aberration through carefully selected material properties
Solution Approach 2:
The imaging lens uses composite material selection across six elements with different refractive indices and Abbe numbers. By combining materials with specific optical properties (e.g., high Abbe number elements with low Abbe number elements), the system achieves both low F-number performance and chromatic aberration correction
3Volume of moving object
If lens size is reduced, then device downsizing is achieved, but optical performance deteriorates
Solution Approach 1:
The patent utilizes aspherical surfaces on selected lens elements to achieve compact lens size while maintaining optical performance. The aspherical design allows for reduced overall lens length and diameter while correcting spherical aberration and other monochromatic aberrations that would otherwise require larger lens elements
4Adaptability or versatility
If angle of view is increased, then imaging capability is improved, but aberration correction becomes more difficult
Solution Approach 1:
The six-element structure segments the optical power distribution, with specific elements (first, third, and fifth with negative power; second, fourth, and sixth with positive power) arranged to handle different field angles. This segmentation enables wide angle of view while distributing aberration correction responsibilities across multiple elements
Solution Approach 2:
Different lens elements are optimized for different local field regions. The aspherical surfaces and specific power distributions in each element are tailored to correct aberrations at various field angles, enabling wide angle of view with maintained image quality across the entire field
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 solution enables the creation of high-quality imaging lenses with improved peripheral image quality, reduced size, and cost-effectiveness, while maintaining a wide angle of view and minimizing chromatic aberration, thus addressing the demands for advanced imaging performance in vehicle and surveillance cameras.
Implementation Method 1
a first lens L1 having a negative power, a second lens L2 having a positive power, a third lens L3 having a negative power, a fourth lens L4 having a positive power, a fifth lens L5 having a positive power, and a sixth lens L6 having a negative power, in order from the object side
Data Source
AI summary
An imaging lens consists of a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, a positive fifth lens, and a negative sixth lens in order from the object side. The Abbe number of the material of the sixth lens with respect to the d-line is less than or equal to 30. When the radius of curvature of the object side surface of the third lens is taken as R3F, the radius of curvature of the image side surface of the third lens is taken as R3R, and the Abbe number of the material of the third lens with respect to the d-line is taken as νd3, the following conditional expressions are satisfied:1.35<(R3F+R3R)/(R3F−R3R)<6.0 (1)νd3<30.0 (2).