Six-Element Imaging Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical lens assemblies for mobile devices, such as those with five- or six-element lens structures, fail to meet the increasing demands for high-end specifications in terms of image quality, field of view, and compact size, particularly due to insufficient back focal length and aberration correction.
Innovation Solution
The proposed imaging lens assembly consists of six elements with specific refractive powers and aspheric surfaces, including a first lens with negative power, a second with positive power, a third with refractive power, a fourth with aspheric surfaces, a fifth with positive power, and a sixth with negative power, optimized to minimize total track length and maintain compact size while correcting aberrations through carefully defined curvature radii and inflection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional five-element lens structure is used, then the device complexity is reduced, but the image quality and aberration correction are insufficient
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with specific refractive powers and surface curvatures, allowing each element to contribute to correcting specific types of aberrations. The division into multiple elements with optimized individual functions enables superior image quality compared to conventional five-element designs.
Solution Approach 2:
Different lens elements are designed with specific local properties: the first lens element has negative refractive power with specific curvature ratios to correct field curvature, while subsequent elements have positive refractive power with aspheric surfaces to correct spherical aberration and other distortions. Each element's local optical properties are optimized for its specific correction function.
2Length of moving object
If the back focal length is reduced to miniaturize the optical lens assembly, then the total track length is reduced, but the aberration and distortion by the first two lens elements cannot be effectively corrected
Solution Approach 1:
The first lens element is designed with a specific curvature radius ratio (0.3 < |R2/R1| < 0.8) and the sixth lens element with specific curvature characteristics (0.2 < |R12/R11| < 1.0), allowing effective aberration correction within a compact form factor. These parameter optimizations enable short back focal length while maintaining correction effectiveness.
Solution Approach 2:
The first lens element serves multiple functions: it provides negative refractive power for overall focal length control and simultaneously corrects field curvature through its specific curvature ratio. The sixth lens element with inflection points on its image-side surface provides both focal length contribution and distortion correction, enabling multi-functionality within limited space.
3Adaptability or versatility
If the field of view is increased, then the adaptability is improved, but the back focal length cannot be effectively miniaturized
Solution Approach 1:
Aspheric surfaces are implemented on multiple lens elements (second, third, fourth, and fifth lens elements) with specific conic coefficients and higher-order aspheric terms. These curved surface designs enable increased field of view by controlling light ray paths more effectively, while maintaining compact back focal length through optimized surface geometries.
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
This configuration enhances image quality by effectively reducing aberrations, maintaining a compact size, and allowing for a larger field of view, while also enabling a larger aperture for improved light entry and image clarity.
Implementation Method 1
The fourth lens element has refractive power, wherein an object-side surface and an image-side surface of the fourth lens element are aspheric. The fifth lens element has positive refractive power, wherein an object-side surface and an image-side surface of the fifth lens element are aspheric.
Implementation Method 2
The sixth lens element with negative refractive power has a concave image-side surface, wherein the sixth lens element has at least one inflection point on the image-side surface thereof.
Data Source
AI summary
An imaging 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, a fifth lens element and a sixth lens element. The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element with refractive power has an object-side surface and an image-side surface being aspheric. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being aspheric. The sixth lens element with negative refractive power has a concave image-side surface, wherein at least one reflection point is formed on the image-side surface thereof.