Five-element Image Lens Assembly Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical systems, such as those used in portable electronic devices, fail to meet the increasing demands for high resolution and image quality due to limitations in the four-element lens structure, particularly in terms of axial distance between lens elements, which restricts the placement of mechanical components like aperture stops or shutters.
Innovation Solution
A five-element image lens assembly is designed with specific refractive powers and surface curvatures for each lens element, including aspheric surfaces, to optimize image quality, correct aberrations, and allow for the placement of mechanical components without spatial restrictions, featuring a configuration where the first lens element has positive refractive power with a convex object-side surface, the second lens element has a concave object-side surface, the third lens element has negative refractive power with a convex object-side and concave image-side surface, the fourth lens element has positive refractive power with a concave object-side and convex image-side surface, and the fifth lens element has negative refractive power with a concave image-side surface and at least one convex shape in an off-axis region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a four-element lens structure is used, then the optical system is compact, but the image quality and resolution cannot meet high-end requirements
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive powers and surface curvatures. Each element is optimized for specific aberration correction: the first element (positive power) corrects spherical aberration, the second element (negative power) corrects coma, the third element (positive power) corrects astigmatism, the fourth element (negative power) corrects field curvature, and the fifth element (positive power) corrects distortion. This segmentation allows each element to address specific image quality issues that cannot be resolved with fewer elements.
2Length of stationary object
If the axial distance between lens elements is reduced, then the optical system becomes more compact, but mechanical components like aperture stops or shutters cannot be properly disposed
Solution Approach 1:
The patent optimizes the axial distances between specific lens elements to create local spaces suitable for mechanical components. The distance between the first and second lens elements (T12) and between the second and third lens elements (T23) are specifically controlled to provide adequate space for aperture stops or shutters while maintaining overall compactness. This local optimization of spacing allows mechanical components to be disposed without requiring the entire optical system to be expanded.
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 five-element image lens assembly achieves improved image quality, corrects aberrations, and allows for the placement of mechanical components like aperture stops, enhancing the manufacturing yield and image-sensing efficiency while maintaining a compact design suitable for electronic devices.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The third lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.
Data Source
AI summary
An 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 an object-side surface being convex in a paraxial. The second lens element with refractive power has an object-side surface being concave in a paraxial region. The third lens element with negative refractive power has an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region. The fourth lens element with positive refractive power has an object-side surface being concave in a paraxial region and an image-side surface being convex in a paraxial region. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region.