Five-Element Optical Lens Assembly Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical lens systems, such as those with four-element and five-element lens structures, fail to meet the increasing demands for high resolution and image quality in portable electronic devices, particularly due to inadequate correction of Petzval Sum and astigmatism, leading to image plane non-flatness and poor image quality.
Innovation Solution
A compact optical image capturing lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including a first lens with positive refractive power, a second with negative refractive power, a third with negative refractive power, a fourth with negative refractive power and aspheric surfaces, and a fifth with negative refractive power and inflection points, optimized to correct aberrations and astigmatism, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The lens assembly is divided into five distinct lens elements with specific refractive powers (positive, negative, negative, negative, and positive/negative), allowing each element to contribute to correcting different types of optical aberrations. This segmentation enables sophisticated aberration correction that cannot be achieved with fewer elements, thereby improving image quality while maintaining reasonable structural complexity.
2Measurement precision
If a five-element lens structure is used, then the image quality is improved, but the Petzval Sum correction is inadequate due to refractive power arrangement
Solution Approach 1:
The patent specifies precise parameter relationships: the first lens element has positive refractive power, the second and third have negative refractive power, the fourth has negative refractive power with aspheric surfaces, and the fifth has positive or negative refractive power with aspheric surfaces and inflection points. These parameter configurations enable effective Petzval Sum correction and improve image plane flatness.
Solution Approach 2:
The fourth and fifth lens elements incorporate aspheric surfaces with inflection points, which provide superior correction of spherical aberration and other monochromatic aberrations compared to traditional spherical surfaces. This curvature design enables better control over light ray paths and improves overall optical performance.
3Ease of operation
If conventional five-element lens structure is used, then the basic imaging function is provided, but the image plane flatness is poor due to ineffective Petzval Sum correction
Solution Approach 1:
The patent establishes specific parameter relationships: when the focal length of the optical image capturing lens assembly is f, the focal length of the third lens element is f3, the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, and the curvature radius of the object-side surface of the second lens element is R2, the following relationships are satisfied: -0.60<f/f3<0.10, 0.30<T12/T23<1.70, and |R2|>0.50f. These parameter constraints enable effective Petzval Sum correction and improve image plane flatness.
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 proposed lens assembly achieves improved image quality, corrected aberrations, and a more compact design, suitable for high-resolution applications in portable electronic devices, including digital cameras and mobile devices, by effectively adjusting refractive power and surface curvatures to address the limitations of conventional systems.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element has negative refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface
Data Source
AI summary
An optical image capturing lens assembly 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 has negative refractive power. The third lens element has negative refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element with refractive power has a concave image-side surface, wherein the fifth lens element has at least one inflection point formed on at least one surface thereof. Both of the object-side surface and the image-side surface of the fourth and fifth lens elements are aspheric. The optical image capturing lens assembly has a total of five lens elements with refractive power.