Five-Element Imaging Lens Aberration Correction
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Solution Overview
Problem
Conventional compact imaging lens assemblies with four or five elements fail to effectively correct chromatic aberration and field curvature, leading to insufficient image quality in high-end mobile devices with high pixel counts.
Innovation Solution
A five-element imaging lens system with specific refractive power distributions and aspheric surfaces, including a first lens with positive power, a second with negative power, a third with negative power and an inflection point, a fourth with positive power, and a fifth with negative power, along with air gaps between elements, optimized by conditions such as Abbe numbers and curvature radii to enhance chromatic aberration correction and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element imaging lens assembly is used, then the device size is compact, but the image quality is insufficient for high-end mobile devices with high pixel counts
Solution Approach 1:
The imaging lens system divides the optical correction function into five distinct lens elements, each with specific refractive power and surface characteristics. This segmentation allows independent optimization of each element to correct different types of aberrations, achieving superior image quality that cannot be obtained with fewer elements
Solution Approach 2:
Different regions of the lens elements have different surface characteristics - specifically, the third lens element has an aspheric image-side surface with inflection points in the off-axis region, while the fourth and fifth elements have aspheric surfaces with specific curvature distributions. This local variation in surface quality enables precise correction of field curvature and chromatic aberration in different field regions
2Manufacturing precision
If a conventional five-element imaging lens system is used, then the image quality is improved, but the chromatic aberration and field curvature are not effectively corrected due to poor refractive power distribution
Solution Approach 1:
The system employs specific parameter ranges for refractive powers of each lens element (f1, f2, f3, f4, f5) and their combinations, along with constrained Abbe number differences between adjacent elements. These parameter optimizations enable effective chromatic aberration correction while maintaining a compact overall structure
Solution Approach 2:
The patent specifies different Abbe numbers for adjacent lens elements (|V1-V2|≥5.0, |V2-V3|≥5.0, |V3-V4|≥5.0, |V4-V5|≥5.0), creating a composite optical system where each element contributes differently to chromatic aberration correction. This composite approach allows the system to overcome the limitations of individual lens materials
3Manufacturing precision
If the refractive power is poorly distributed among lens elements, then the device structure is simpler, but the field curvature and chromatic aberration cannot be effectively corrected
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (third, fourth, and fifth elements) with specifically designed curvature distributions. The aspheric image-side surface of the third element has inflection points, while the fourth and fifth elements have aspheric surfaces with controlled curvature variations. This curvature optimization effectively corrects field curvature while maintaining a compact lens configuration
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 significantly improves chromatic aberration correction and field curvature, meeting the requirements for high image quality and compactness in high pixel-count sensors, ensuring better image quality and efficiency in compact imaging systems.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power
Implementation Method 2
an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and the following condition is satisfied: |V2−V3|≤8.0
Implementation Method 3
Both of the second lens element and the third lens element are configured to have negative refractive power so as to reduce the Petzval's sum and to effectively correct the field curvature of the imaging lens system
Data Source
AI summary
An imaging lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The third lens element with negative refractive power has a concave image-side surface and the image-side surface having at least one inflection point in an off-axis region. The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element with negative refractive power has a concave object-side surface and a concave image-side surface with at least one convex shape in an off-axis region.