Imaging Lens Nested Configuration Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses for small cameras face challenges in achieving both downsizing and satisfactory aberration correction, particularly in smartphones and other portable devices, where a high-resolution lens configuration often results in increased size and limited portability.
Innovation Solution
The proposed imaging lens configuration includes a first lens group with positive refractive power and a second lens group with negative refractive power, arranged from the object side to the image plane side, with specific conditional expressions for focal lengths, distances, and curvature radii to optimize aberration correction and downsizing, using air gaps between lenses and aspheric surfaces to correct peripheral aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve high-resolution imaging, then aberration correction is improved, but the total track length increases and the lens size becomes larger
Solution Approach 1:
The patent implements a nested lens configuration where the fourth lens is positioned within the third lens, and the sixth lens is positioned within the fifth lens. This nesting arrangement allows multiple lens elements to occupy overlapping spatial regions, effectively increasing the optical power and aberration correction capability without proportionally increasing the total track length. The nested structure enables high-resolution imaging by concentrating multiple refractive surfaces in a compact axial space.
Solution Approach 2:
The patent transitions from a conventional linear arrangement of lenses to a multi-dimensional configuration by introducing nested lens positions. Instead of simply adding more lenses in sequence along the optical axis, the invention utilizes radial and axial positioning to create overlapping lens fields. This dimensional approach allows the lens system to achieve high aberration correction with reduced total track length by exploiting three-dimensional space more efficiently.
2Manufacturing precision
If the number of lenses is increased to achieve high-resolution imaging, then aberration correction is improved, but the lens configuration becomes more complex
Solution Approach 1:
The patent merges the functions of multiple lenses by positioning them in nested configurations where their optical paths overlap. The fourth lens merges with the third lens, and the sixth lens merges with the fifth lens, creating combined optical elements that provide synergistic aberration correction. This merging approach reduces the effective number of independent lens components while maintaining high correction performance, thereby simplifying the overall lens configuration.
Solution Approach 2:
Each lens in the nested configuration serves multiple functions: the third lens provides primary focusing while the nested fourth lens corrects chromatic and spherical aberrations; similarly, the fifth lens provides focusing while the nested sixth lens corrects residual aberrations. This multi-functionality allows each lens element to contribute to both image formation and aberration correction, reducing the need for additional dedicated correction lenses and simplifying the overall configuration.
3Manufacturing precision
If the lens configuration is optimized for high resolution, then image quality is improved, but the lens size increases and portability is reduced
Solution Approach 1:
The nested lens configuration allows the patent to achieve high-resolution imaging with a compact lens volume. By positioning the fourth lens within the third lens and the sixth lens within the fifth lens, the invention maximizes the optical path density within a minimized axial space. This nesting strategy enables high image quality without proportionally increasing the total track length, thus maintaining small lens size suitable for portable devices.
Solution Approach 2:
The patent employs specific parameter relationships to optimize the balance between image quality and lens size. The conditional expressions define optimal ranges for focal lengths, spacing distances, and curvature radii that enable high-resolution imaging with minimized total track length. By carefully controlling these parameters within specified ranges, the invention achieves superior image quality while keeping the lens compact for portable applications.
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 allows for a compact, high-resolution imaging lens that effectively corrects aberrations such as chromatic aberration, astigmatism, and distortion, while maintaining a small size suitable for portable devices, enabling a wider angle of view and improved image quality.
Implementation Method 1
a first lens group having positive refractive power; and a second lens group having negative refractive power, arranged in the order from an object side to an image plane side
Implementation Method 2
using air gaps between lenses and aspheric surfaces to correct peripheral aberrations
Data Source
AI summary
An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a front side lens group and a rear side lens group. The front side lens group includes a fourth lens and a fifth lens. The rear side lens group includes a sixth lens having two aspheric surfaces and a seventh lens having two aspheric surfaces. The imaging lens has a total of seven single lenses. The first to seventh lenses are arranged respectively with a space in between. The third and fourth lenses have convex surfaces on the image plane side. The fifth lens has a convex surface on the object side. The rear side lens group has a specific focal length.