Imaging Lens Aberration Correction via Multi-Group Segmentation
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Solution Overview
Problem
Existing imaging lenses for vehicle-mounted and surveillance cameras fail to adequately correct lateral chromatic aberration and have limited wide-angle views, with most offering angles of view of 90° or less.
Innovation Solution
The design of an imaging lens comprising a first lens group with negative meniscus lenses and a second lens group with positive refractive power, optimized by specific Abbe's number and partial dispersion ratio conditions, to achieve wide angles of view while correcting various aberrations, including lateral chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional imaging lens designs are used, then the lens structure is simple, but lateral chromatic aberration is not sufficiently corrected
Solution Approach 1:
The imaging lens is divided into multiple lens groups (first lens group with negative meniscus lenses, second lens group with positive refractive power, and additional groups) where each group contributes to correcting specific aberrations. This segmentation allows complex aberration correction to be distributed across multiple simpler components rather than requiring a single complex element.
Solution Approach 2:
The patent employs composite lens structures combining different types of lenses (negative meniscus lenses, positive lenses, biconcave lenses) with specific Abbe's numbers and partial dispersion ratios. This composite approach allows simultaneous correction of multiple aberration types including lateral chromatic aberration by leveraging the complementary optical properties of different lens materials and configurations.
2Adaptability or versatility
If conventional imaging lenses are used, then the lens configuration is simple, but the angle of view is limited to 90° or less
Solution Approach 1:
The lens design incorporates movable lens groups that can be shifted along the optical axis to adjust the angle of view. The first lens group containing negative meniscus lenses and the second lens group with positive refractive power are positioned to enable dynamic adjustment, allowing the system to transition between wide-angle and telephoto configurations.
Solution Approach 2:
The patent extends the conventional single-plane lens configuration by introducing multiple lens groups arranged in sequence along the optical axis, each contributing to different aspects of image formation. This multi-dimensional arrangement enables both wide angle of view and effective aberration correction that cannot be achieved with simple single-group designs.
3Adaptability or versatility
If lenses with wide angle of view are designed, then the angle of view increases, but aberration correction becomes insufficient
Solution Approach 1:
Different lens groups are assigned specific functions: the first lens group with negative meniscus lenses primarily corrects lateral chromatic aberration and distortion, while the second lens group with positive refractive power focuses on spherical aberration and focus. This local specialization of optical functions allows each group to be optimized for its specific correction task while contributing to the overall wide-angle performance.
Solution Approach 2:
The patent specifies precise parameter ranges for Abbe's numbers (vd1, vd2BL2, vd4) and partial dispersion ratios (θgF1, θgF2BL2, θgF4) of the lens materials to achieve optimal aberration correction. By carefully controlling these optical parameters within defined ranges, the design ensures effective lateral chromatic aberration correction while maintaining wide angle of view capability.
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 imaging lens provides a wide angle of view and effectively corrects aberrations, resulting in high-quality images with improved image formation capabilities.
Implementation Method 1
an imaging lens which consists of, in order from the object side to the image side, a first lens group, a stop, and a second lens group having a positive refractive power
Implementation Method 2
Conditional Formulae (1) and (2) below being satisfied. Note that it is preferable for Conditional Formulae (1-1) and/or (2-1) to be satisfied. 15vd2BL2−vd1vd2BL2−vd1 wherein vd1 is the Abbe's number of the 1-1 negative meniscus lens, and vd2BL2 is the Abbe's number of the 2B-2 negative lens
Data Source
AI summary
An imaging lens is constituted by, in order from the object side to the image side: a first lens group; a stop; and a second lens group having a positive refractive power. The first lens group is constituted by, in order from the object side to the image side: a 1-1 negative meniscus lens having a concave surface toward the image side; a 1-2 negative meniscus lens having a concave surface toward the image side; a 1-3 biconcave lens; and a 1-4 positive lens. The second lens group is constituted by, in order from the object side to the image side: a 2A lens group having a positive refractive power; and a 2B lens group having a positive refractive power as a whole, constituted by a 2B-1 positive lens, a 2B-2 negative lens, and a 2B-3 positive lens. Predetermined conditional formulae are satisfied.