Six-Lens Imaging System for Corner Shading and Aberration Control
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Solution Overview
Problem
Conventional imaging lenses fail to achieve optimal optic and aberration characteristics, leading to issues with image resolution and the occurrence of image shading phenomena at the corners of image-forming surfaces.
Innovation Solution
The proposed imaging lens configuration consists of a specific arrangement of lenses with negative and positive refractive powers, including a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with positive refractive power, where the fifth and sixth lenses form a lens group, and satisfy specific conditional expressions to prevent image shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional imaging lens configuration is used, then the device complexity is reduced, but the image resolution and aberration characteristics deteriorate
Solution Approach 1:
The imaging lens is divided into six distinct lens elements with alternating positive and negative refractive powers. Each lens element is optimized independently with specific focal lengths and refractive indices, allowing precise control over optical characteristics while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the lens system are assigned different functional characteristics. The first lens has negative refractive power for specific aberration correction, while the third and fourth lenses have positive refractive power for focusing. Each lens surface may have different curvatures and aspheric coefficients tailored to local optical requirements
2Manufacturing precision
If lenses are arranged to improve aberration characteristics, then image quality is improved, but image shading occurs at corners
Solution Approach 1:
The conditional expressions define specific parameter ranges for focal lengths (f1, f2, f3, f4), refractive indices (n1, n2, n3, n4), and curvature radii (r1, r2, r3, r4, r5, r6) that simultaneously optimize aberration correction and illuminate the entire image plane uniformly, preventing corner shading
Solution Approach 2:
The lens surfaces are designed with specific curvature characteristics, including aspheric surfaces defined by conic constants and aspheric coefficients. These curved surfaces are optimized to redirect light rays uniformly across the entire image plane, ensuring consistent illumination from center to corners while maintaining aberration correction
3Ease of manufacture
If a simple lens structure is used, then ease of manufacture is improved, but optic characteristics deteriorate
Solution Approach 1:
The conditional expressions establish specific parameter ranges that balance manufacturing feasibility with optical performance. By defining constraints on focal length ratios, refractive index ranges, and curvature radii, the design ensures that high-quality optics can be achieved using conventional manufacturing techniques without requiring excessively complex lens 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 resolution by preventing image shading at the corners of the image-forming surface, allowing for high-quality image capture without the need for distortion correction using sensors and algorithms.
Implementation Method 1
a first lens having negative (−) refractive power; a second lens having negative (−) refractive power; a third lens having positive (+) refractive power; a fourth lens having positive (+) refractive power; a fifth lens having negative (−) refractive power, and a sixth lens having positive (+) refractive power
Data Source
AI summary
According to exemplary embodiments of the present invention, an imaging lens includes, in an ordered way from an object side, a first lens having negative (−) refractive power, a second lens having negative (−) refractive power, a third lens having positive (+) refractive power, a fourth lens having positive (+) refractive power, a fifth lens having negative (−) refractive power, and a sixth lens having negative (−) refractive power, wherein, a conditional expression of 0.5<Y6/Y10<0.55 is satisfied, where a height of a point 60% of a highest height of an image-forming surface is Y6, a full size of an opposite angle within an active area of an image sensor is Y10.