Five-Element Aspheric Lens Assembly for Aberration Control
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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 miniaturization and improved image quality in portable electronic devices, particularly due to issues with aberration, spherical aberration, and total track length.
Innovation Solution
An optical image lens assembly comprising a specific configuration of five lens elements with varying refractive powers and aspheric surfaces, including 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 and inflection points, optimized by specific curvature radius relationships and axial distances to reduce aberrations and maintain compact size.
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 aberration correction are insufficient
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive power distributions (positive, negative, negative, positive, negative). This segmentation allows each element to be optimized for specific aberration corrections, achieving superior image quality compared to conventional four-element structures.
Solution Approach 2:
The patent applies aspheric surfaces specifically to the third, fourth, and fifth lens elements, while the first and second elements use spherical surfaces. This localized application of aspheric design corrects spherical aberration and other distortions where they are most needed, improving image quality without unnecessarily increasing overall system complexity.
2Manufacturing precision
If a five-element lens structure is used, then the image quality is improved, but the total track length increases
Solution Approach 1:
The patent employs aspheric surfaces on the third, fourth, and fifth lens elements, which allow for more flexible control of light paths and enable compact folding of the optical trajectory. This parameter change from spherical to aspheric surfaces enables better aberration correction without proportionally increasing the total track length.
Solution Approach 2:
The patent introduces inflection points on the aspheric surfaces of the fifth lens element, creating complex surface geometries that manipulate light in multiple dimensions. This allows for efficient space utilization and compact overall length while maintaining the five-element structure needed for superior image quality.
3Power
If the curvature difference between object-side and image-side surfaces of the first lens element is excessive, then the refractive power is increased, but spherical aberration is generated
Solution Approach 1:
The patent applies asymmetric aspheric surface designs to the third, fourth, and fifth lens elements, with different curvature profiles on object-side and image-side surfaces. This asymmetric design allows each surface to be optimized for its specific function while balancing the overall refractive power distribution, preventing excessive curvature differences that would cause spherical aberration.
Solution Approach 2:
The patent selectively applies aspheric surfaces only to specific lens elements (third, fourth, and fifth) rather than all elements. This localized approach corrects spherical aberration and other distortions where they are most needed, while maintaining simpler spherical surfaces in the first and second elements where excessive curvature would be problematic.
4Length of stationary object
If the axial distances between lens elements are reduced for miniaturization, then the compact size is achieved, but the aberration correction capability is reduced
Solution Approach 1:
The patent employs aspheric surfaces with carefully controlled curvature radii and conic constants to achieve effective aberration correction in a compact configuration. The aspheric parameters are optimized to provide sufficient correction capability even with reduced axial distances between elements, enabling miniaturization without sacrificing image quality.
Solution Approach 2:
The patent divides the five lens elements into functional groups with alternating positive and negative refractive powers. This segmentation creates multiple opportunities for aberration correction throughout the compact optical path, with each element contributing to overall image quality despite reduced spacing between components.
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 optical image lens assembly effectively reduces aberrations, maintains compact size, and enhances image quality by balancing refractive power distribution and correcting spherical aberration, thereby addressing the limitations of conventional lens systems.
Implementation Method 1
a first lens element (110), a second lens element (120), a third lens element (130), a fourth lens element (140) and a fifth lens element (150
Data Source
AI summary
An optical image 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 and a convex image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The third lens element with refractive power has two surfaces being aspheric. The fourth lens element with positive refractive power has a convex image-side surface, wherein the surfaces of the fourth lens element are aspheric. The fifth lens element with negative refractive power has a concave image-side surface, wherein the surfaces of the fifth lens element are aspheric, and the fifth lens element has inflection points on at least one of the surfaces thereof.