Imaging Lens Aberration Correction via Refractive Power Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging lenses for compact devices face challenges in achieving both miniaturization and high performance, with issues such as inadequate brightness, poor wide-angle capabilities, and significant aberration corrections.
Innovation Solution
A 5-element imaging lens configuration with specific refractive power distributions and aspherical shapes, including an aperture stop, a first positive refractive power lens, a second meniscus negative lens, a third positive lens, a fourth meniscus positive lens, and a fifth meniscus negative lens, optimized by precise curvature radius and focal length conditions to achieve miniaturization and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 5P lens configuration is used with conventional refractive power distribution, then aberration correction is improved, but brightness becomes inadequate
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the five lens elements. Specifically, it sets the first lens with positive refractive power (f1/f = 0.3 to 0.8), the second lens with negative refractive power (f2/f = -0.5 to -1.5), and subsequent lenses with carefully controlled refractive powers that satisfy specific ratio relationships. This redistribution of optical parameters achieves both superior aberration correction and enhanced brightness by improving light transmission efficiency through the lens system.
2Illumination intensity
If a 5P lens configuration is used with conventional design, then brightness is improved, but wide-angle capability becomes poor
Solution Approach 1:
The patent employs spheroidality by incorporating aspherical surfaces on specific lens elements (the second, fourth, and fifth lenses). The aspherical coefficients are carefully designed to satisfy specific mathematical relationships that enable the lens to capture wider field angles while maintaining image quality across the entire field. This curvature optimization allows the lens to achieve both high brightness and superior wide-angle capability simultaneously.
3Length of moving object
If miniaturization is pursued with conventional lens designs, then device size is reduced, but performance deteriorates
Solution Approach 1:
The patent applies the nesting principle by arranging five lens elements in a compact sequential configuration where each element is strategically positioned to maximize optical efficiency within minimal space. The aperture stop is placed at the object side, followed by the five lenses with carefully controlled air gaps between them. This nested arrangement, combined with the optimized refractive power distribution, achieves miniaturization while maintaining or even enhancing image quality through superior aberration correction.
4Length of moving object
If aperture stop is placed nearest to the object side for miniaturization, then total length is reduced, but aberration correction becomes difficult
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different regions of the lens system. The aperture stop at the object side controls light entry, while the first lens with positive refractive power immediately begins correcting spherical aberration. The second lens with negative refractive power provides localized correction for coma and astigmatism. Each subsequent lens element addresses specific aberration types, creating a distributed aberration correction strategy that works effectively despite the compact aperture stop positioning.
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 results in an imaging lens with improved miniaturization, wide-angle capabilities, and effective aberration correction, achieving an F-number of less than 2.4 and maintaining high image quality.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
a second lens having a negative refractive power
Implementation Method 3
a cemented lens as the first lens group which is constituted by positive and negative lenses, and aspherical lenses as the second and third lens groups
Data Source
AI summary
An image lens is disclosed. The image lens includes, arranged in succession from the object side to the image side, an aperture stop S1, a first lens L1 having two convex surfaces and having a positive refractive power, a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power, and a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power.