Seven-Lens Imaging System Aberration Correction
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Solution Overview
Problem
There is a demand for imaging lenses used in vehicle-mounted cameras, portable terminal cameras, and surveillance cameras that require miniaturization, reduced weight, high optical performance, weather resistance, and the ability to operate in a wide temperature range, including low light conditions and infrared ranges, while maintaining a compact size and favorable appearance.
Innovation Solution
The development of an imaging lens configuration consisting of seven lenses, with specific power arrangements and conditional formulae to achieve a small F number and optimal optical performance, including a negative first lens, positive second lens, negative third lens, positive fourth lens, positive fifth lens, positive sixth lens, and negative seventh lens, with precise Abbe's number and radius of curvature specifications to correct various aberrations and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a six-lens configuration is used, then the lens structure is relatively simple, but the F number cannot be made small enough and optical performance is insufficient
Solution Approach 1:
The lens system is divided into seven distinct lens elements with specific power distributions. The first lens has negative power, the second and third lenses have positive power, the fourth lens has negative power, the fifth and sixth lenses have positive power, and the seventh lens has negative power. This segmentation allows each lens to contribute to specific optical functions, achieving both compactness and high optical performance with a manageable structure.
Solution Approach 2:
The patent applies specific conditional formulas to control the Abbe's numbers and focal lengths of individual lenses. By precisely adjusting these parameters, the system achieves a small F number while maintaining high optical performance. The conditional formulas ensure optimal balance between lens power, material properties, and overall system performance.
2Illumination intensity
If the F number is reduced to enable low-light photography, then light gathering capability improves, but aberrations increase and optical performance deteriorates
Solution Approach 1:
Different regions of the lens system are optimized for different functions. The first lens with negative power handles peripheral light and distortion correction, while the second and third positive power lenses focus on central light and sharpness. The fourth negative power lens corrects chromatic aberration, and the fifth and sixth positive power lenses refine focus and reduce distortion. This local optimization allows small F number operation without sacrificing aberration correction.
Solution Approach 2:
The lens system uses multiple materials with different refractive indices and Abbe's numbers to correct various types of aberrations. By combining lenses with different material properties, the system achieves both low F number and high optical performance, as each material contributes to correcting specific aberrations while maintaining overall light gathering capability.
3Reliability
If lens elements are added to improve optical performance, then aberration correction improves, but device complexity and size increase
Solution Approach 1:
The seven-lens configuration segments the optical system into functional groups that collectively achieve high aberration correction without excessive complexity. Each lens element is assigned a specific power and position to address particular optical challenges, resulting in an efficient structure that balances performance and complexity.
Solution Approach 2:
By optimizing the conditional formulas for Abbe's numbers and focal lengths, the patent achieves superior aberration correction with a controlled number of lens elements. The parameter optimization ensures that each additional lens contributes maximally to performance while minimizing overall structural complexity.
4Volume of moving object
If the lens is miniaturized for compact imaging devices, then device size reduces, but weight and manufacturing precision requirements increase
Solution Approach 1:
The lens system is segmented into seven manageable elements with standardized interfaces and mounting structures. This segmentation allows for modular manufacturing and assembly, reducing the overall precision requirements compared to a single large lens while maintaining compact size. Each lens element can be manufactured and tested separately before final assembly.
Solution Approach 2:
The conditional formulas are designed to optimize the balance between lens size and manufacturing feasibility. By controlling the Abbe's numbers and focal lengths within specific ranges, the patent enables miniaturization while keeping manufacturing precision requirements at acceptable levels for modern optical fabrication capabilities.
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 a compact imaging lens with a small F value, capable of achieving high optical performance, correcting aberrations, and enabling photography under low light conditions with high resolution, while being resistant to environmental factors and maintaining a compact size.
Implementation Method 1
an imaging lens which consists of, in order from the object side, a first lens L1 having a negative power, a second lens L2 having a positive power, a third lens L3 having a positive power, a fourth lens L4 having a negative power, a fifth lens L5 having a positive power, a sixth lens L6 having a positive power, and a seventh lens L7 having a negative power
Data Source
AI summary
An imaging lens consists of, in order from the object, a negative first lens, a positive second lens, a positive third lens, a negative fourth lens, a positive fifth lens, a positive sixth lens, and a negative seventh lens. When νd7 is the Abbe's number of the material for the seventh lens, f is the focal length of the entire system, and f5 is the focal length of the fifth lens, the following conditional formulae are satisfied:νd7<55 (2)1.25<f5/f (10).