Five-Element Lens System Aberration Correction
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Solution Overview
Problem
Conventional compact optical 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 aberration issues and sensitivity to manufacturing variations.
Innovation Solution
A five-element image capturing lens system is designed with specific refractive powers and surface curvatures for each lens element, including aspheric surfaces and inflection points, to optimize image quality and reduce aberrations, while maintaining a compact size and improving manufacturing yield.
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 are insufficient
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive power distributions, where each element has a defined function. This segmentation allows for better correction of optical aberrations compared to a four-element design, while maintaining manageable complexity through systematic arrangement of the elements.
Solution Approach 2:
The patent applies aspheric surfaces specifically to certain lens elements (first, third, and fifth elements) rather than all elements, and introduces inflection points at specific locations. This localized application of complex surface geometries improves image quality where needed while avoiding unnecessary complexity in other areas.
2Manufacturing precision
If a conventional five-element lens structure is used, then the image quality is enhanced, but the refractive power distribution is improper resulting in more aberration and higher sensitivity to manufacturing variations
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element, including refractive power ratios (0.2<f1/f<0.5, 0.3<f2/f<0.6, -0.5<-f3/f<-0.2, 0.2<f4/f<0.5, -0.5<-f5/f<-0.2), curvature radii relationships, and thickness ratios. These controlled parameter changes optimize the balance between image quality and manufacturing tolerance sensitivity.
Solution Approach 2:
The patent introduces aspheric surfaces with inflection points on specific lens elements to correct optical aberrations more effectively than spherical surfaces. The aspheric coefficients are carefully controlled within specific ranges to reduce sensitivity to manufacturing variations while maintaining superior image quality.
3Reliability
If aspheric surfaces with inflection points are added to the fifth lens element, then the aberration correction is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies aspheric surfaces with inflection points only to the fifth lens element (and selectively to other elements) rather than all elements, providing sufficient aberration correction for high-resolution applications without the excessive manufacturing complexity that would result from making all elements aspheric.
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 system achieves improved image quality, reduced aberrations, and increased manufacturing yield by effectively distributing refractive power and correcting aberrations, making it suitable for high-resolution applications in portable devices.
Implementation Method 1
The fifth lens element with negative refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface of the fifth lens element
Data Source
AI summary
An image capturing 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 has positive refractive power. The second lens element with positive refractive power has a convex object-side surface. The third lens element has negative refractive power. The fourth lens element with positive refractive power has a convex image-side surface. The fifth lens element with negative refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface of the fifth lens element. The image capturing lens system has a total of five lens elements with refractive power.