Six-Element Optical Lens Assembly for Compact Aberration Correction
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Solution Overview
Problem
Conventional compact optical lens systems, such as those with four- or five-element lens structures, fail to meet the increasing demands for high image quality and resolving power in portable electronic devices due to improper refractive power distribution and lens curvature, leading to ineffective correction of chromatic aberration, astigmatism, and coma.
Innovation Solution
An image capturing optical lens assembly with a six-element structure, featuring specific refractive powers and aspheric surfaces, including a first lens with positive convex surfaces, a second lens with negative concave surfaces, and a sixth lens with a concave image-side surface and inflection points, optimized by relationships between curvatures and distances to correct aberrations and maintain a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolving power cannot meet high-end requirements
Solution Approach 1:
The six-element lens structure integrates multiple functions into a unified system: the first element (positive power) provides primary convergence, the second element (negative power) corrects chromatic aberration, the third element (negative power) further refines aberration correction, the fourth element (positive power) enhances focus, the fifth element (positive power) corrects astigmatism, and the sixth element (negative power) fine-tunes coma and field curvature. This multi-functional integration achieves high image quality without requiring separate correction systems.
Solution Approach 2:
The patent optimizes specific parameters including the refractive powers of each lens element, the curvatures of object-side and image-side surfaces, the axial distances between elements, and the aspheric coefficients. By precisely controlling these parameters, the system achieves superior aberration correction and resolving power while maintaining a compact form factor suitable for portable devices.
2Ease of manufacture
If conventional lens structures are used, then manufacturing is simpler, but chromatic aberration, astigmatism, and coma cannot be corrected effectively
Solution Approach 1:
The optical system is divided into six distinct lens elements, each with specific refractive power and surface characteristics. This segmentation allows each element to address specific aberration types: the second element (negative power) primarily corrects chromatic aberration, the fifth element (positive power with convex image-side surface) corrects astigmatism, and the sixth element (negative power with concave image-side surface) corrects coma. This divided approach achieves comprehensive aberration correction while maintaining manufacturability.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the sixth element with a concave image-side surface featuring inflection points. These curved surfaces enable precise control over light ray paths, allowing effective correction of chromatic aberration, astigmatism, and coma while maintaining reasonable manufacturing complexity through standard aspheric fabrication techniques.
3Volume of moving object
If the lens assembly is made compact, then it is suitable for portable electronics, but aberration correction ability is limited
Solution Approach 1:
The six lens elements are arranged in a compact sequence with optimized axial distances between them, creating a nested configuration that maximizes optical performance within a minimal envelope. The elements are positioned closely together with precise spacing, allowing the entire assembly to fit within the limited space of portable electronic devices while maintaining sufficient optical path length for effective aberration correction.
Solution Approach 2:
The patent achieves compactness by optimizing critical parameters including the axial distances between lens elements, the curvatures of object-side and image-side surfaces, and the refractive powers. By carefully controlling these parameters, the system maintains effective aberration correction capability while reducing the overall assembly size to fit portable device form factors.
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 lens assembly effectively corrects chromatic aberration, astigmatism, and coma, enhancing image quality and resolving power while maintaining a compact form factor suitable for portable electronics.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave object-side surface. The third lens element has negative refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has a convex image-side surface. The sixth lens element with refractive power has a concave image-side surface
Data Source
AI summary
An image capturing optical 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 positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave object-side surface. The third lens element has negative refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has a convex image-side surface. The sixth lens element with refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface of the sixth lens element are aspheric, and the sixth lens element has at least one inflection point on the image-side surface thereof.