Five-Element Optical Lens Set for Compact Imaging
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Solution Overview
Problem
Conventional optical imaging lens sets for portable devices face challenges in achieving good imaging quality with reduced size, as they often have large spherical aberration and aberration issues, making it difficult to maintain performance while minimizing length and expanding the field of view.
Innovation Solution
An optical imaging lens set with five lens elements, including a first lens with negative refractive power, a third lens with a concave image-side surface, and a fifth lens with aspherical surfaces, arranged to satisfy specific thickness and air gap relationships, such as (G12+T2)/T1≤2.9 and υ1≥45, to optimize refractive power and reduce overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the optical imaging lens set is reduced, then the size of portable devices is minimized, but the field of view angle cannot be expanded and imaging quality deteriorates
Solution Approach 1:
The optical imaging lens set is divided into five distinct lens elements (first through fifth lens elements), each with specific refractive power characteristics. This segmentation allows independent optimization of each element's function: the first element with negative refractive power expands the field of view, while subsequent elements with positive refractive power focus light effectively, achieving both compact length and expanded field of view simultaneously
Solution Approach 2:
The patent specifies precise parameter relationships including (G12+T2)/T1≤2.9, (T1+T5+G23)/T2≤1.9, and υ1≥45, along with varying refractive powers for different lens elements. These parameter optimizations enable the lens set to maintain short length while achieving expanded field of view angle and high imaging quality through mathematical optimization of optical paths
2Length of moving object
If the lens elements are made thinner to reduce overall length, then the device size is reduced, but spherical aberration and optical performance deteriorate
Solution Approach 1:
The patent employs aspherical surfaces on the first and fourth lens elements, specifically noting that the first lens element has an aspherical object-side surface and the fourth lens element has an aspherical image-side surface. This curvature variation allows thin lens elements to effectively control spherical aberration by deviating from simple spherical shapes, maintaining optical performance while reducing thickness
Solution Approach 2:
The patent specifies precise parameter relationships including (G12+T2)/T1≤2.9 and (T1+T5+G23)/T2≤1.9, along with minimum Abbe number υ1≥45 for the first lens element. These parameter optimizations enable thin lens elements to maintain effective focal length and control spherical aberration through mathematical optimization of thickness, air gaps, and material properties
3Reliability
If conventional lens designs are used to maintain imaging quality, then optical performance is preserved, but the lens set length cannot be reduced
Solution Approach 1:
The optical imaging lens set is divided into five distinct lens elements (first through fifth lens elements), each with specific refractive power characteristics. This segmentation allows independent optimization of each element's function: the first element with negative refractive power expands the field of view, while subsequent elements with positive refractive power focus light effectively, achieving both compact length and high imaging quality simultaneously
Solution Approach 2:
The patent specifies precise parameter relationships including (G12+T2)/T1≤2.9, (T1+T5+G23)/T2≤1.9, and υ1≥45, along with varying refractive powers for different lens elements. These parameter optimizations enable the lens set to maintain short length while achieving high imaging quality through mathematical optimization of optical paths, aberration control, and material selection
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 effectively shortens the lens system length while maintaining sufficient optical performance, enhancing image definition and reducing aberrations, particularly in low-light conditions, and improving fabrication ease.
Implementation Method 1
Each lens element has an object-side surface facing toward an object side as well as an image-side surface facing toward an image side. The optical imaging lens set exclusively has the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element with refractive power.
Data Source
AI summary
An optical lens set includes: a first, second, third, fourth and fifth lens element, an aperture stop disposed between said first and second lens element, said first lens element has negative refractive power, and has an object-side surface with a convex part in a vicinity of its periphery, said third lens element has an image-side surface with a concave part in a vicinity of its periphery, said fourth lens element has an object-side surface with a concave part in a vicinity of its periphery, said fifth element has aspherical object-side and image-side surfaces. T1, T2 and T5 are the thicknesses of said first, second and fifth lens element along the optical axis respectively, G12 and G23 are an air gaps between said first and second lens element, and between said second and third lens element along said optical axis respectively, the optical lens set satisfies the relationships: (G12+T2)/T1≤2.9 and (T1+T5+G23)/T2≤1.9.