Imaging Lens Aberration Correction via Four-Lens Segmentation
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Solution Overview
Problem
Conventional imaging lenses face difficulties in achieving a balance between low profile and low F-number while effectively correcting aberrations, particularly in the peripheral area, leading to suboptimal optical performance.
Innovation Solution
The imaging lens configuration includes a first meniscus-shaped lens with positive refractive power, a second biconcave lens with negative refractive power, a third meniscus-shaped lens with positive refractive power and concave object-side surface, and a fourth meniscus-shaped lens with negative refractive power and concave image-side surface, along with specific conditional expressions to optimize lens parameters for aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional imaging lens configurations are used to achieve low profile and low F-number, then the lens can be compact with reduced total track length, but aberrations in the peripheral area cannot be properly corrected leading to suboptimal optical performance
Solution Approach 1:
The imaging lens is divided into four distinct lens groups (first lens with positive refractive power, second lens with negative refractive power, third lens with positive refractive power, and fourth lens with negative refractive power), each contributing to specific aberration corrections. This segmentation allows independent optimization of each lens group to address different optical aberrations while maintaining a compact overall structure.
Solution Approach 2:
Different lens groups are assigned specific functions tailored to their optical characteristics: the first lens primarily controls spherical aberration and coma, the second lens addresses chromatic aberration and astigmatism, the third lens corrects field curvature and distortion, and the fourth lens refines chromatic and spherical aberrations. This localized optimization of each lens group's properties enables effective peripheral aberration correction within a compact design.
2Length of moving object
If the first lens strengthens refractive power to reduce profile, then the total track length decreases, but spherical aberration, astigmatism, and distortion may increase
Solution Approach 1:
The positive refractive power of the first lens that reduces profile height is counterbalanced by the negative refractive power of the second lens. This counterweight approach allows the first lens to achieve compactness while the second lens compensates for the aberrations introduced by the strong refractive power, maintaining optical performance.
Solution Approach 2:
The patent specifies that the first lens is formed in a meniscus shape with the object-side surface being convex, which is a specific geometric parameter configuration. This shape, combined with controlled refractive indices and curvature radii of subsequent lenses, enables the system to achieve low profile while correcting aberrations through optimized parameter combinations.
3Manufacturing precision
If the third lens has concave object-side surface to correct astigmatism and distortion, then optical performance improves, but the lens complexity increases
Solution Approach 1:
The third lens is designed with a concave object-side surface, creating a meniscus shape that is specifically effective for correcting astigmatism and distortion. This curved surface configuration, while adding geometric complexity, provides superior optical performance by naturally correcting field curvature and distortion without requiring additional lens elements.
4Length of stationary object
If the fourth lens has concave image-side surface to secure back focus, then the back focus distance is maintained, but the profile reduction is compromised
Solution Approach 1:
The fourth lens with negative refractive power and concave image-side surface is positioned to provide the necessary back focus distance. While this configuration does extend the profile slightly, it is the minimal extension required to achieve adequate back focus for sensor placement, representing a compromise that satisfies both compactness and functional requirements.
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
This configuration achieves high-resolution imaging with a low profile and low F-number while effectively correcting spherical aberration, chromatic aberration, astigmatism, coma aberration, and distortion, ensuring excellent optical performance across the image field.
Implementation Method 1
a first lens with positive refractive power being formed in a meniscus shape having an object-side surface being convex in a paraxial region
Implementation Method 2
a second lens with negative refractive power in a paraxial region
Implementation Method 3
a third lens with positive refractive power having an object-side surface being concave in a paraxial region
Implementation Method 4
a fourth lens with negative refractive power having an image-side surface being concave in a paraxial region
Data Source
AI summary
There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power being formed in a meniscus shape having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with positive refractive power having an object-side surface being concave in a paraxial region, and a fourth lens with negative refractive power having an image-side surface being concave in a paraxial region, and predetermined conditional expressions are satisfied.