Eight-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
There is a need to reduce the thickness of optical imaging lenses while maintaining good imaging quality, as increasing the number of lens elements can lead to increased thickness and aberrations.
Innovation Solution
The design of an optical imaging lens with eight lens elements, featuring varying refracting power and specific surface shapes, such as convex and concave portions, to optimize parameters like thickness, air gaps, and focal lengths, adhering to specific inequalities to minimize thickness while improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens elements is increased to improve imaging quality, then imaging quality is improved, but the thickness of the optical imaging lens increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, thickness ratios, and focal length relationships of the eight lens elements. Specific inequalities are imposed on these parameters (e.g., 0.9 < T1/(T2+T3) < 1.5, 1.0 < T5/(T6+T7) < 2.0) to optimize the optical path and reduce overall thickness while maintaining imaging quality. This systematic parameter optimization allows the lens to achieve good imaging performance with a compact form factor.
Solution Approach 2:
The patent employs composite material strategies by combining lens elements with different refractive index ranges and Abbe number characteristics. The first four lens elements have refractive indices between 1.50-1.80 and Abbe numbers between 20-40, while the fifth through eighth elements have refractive indices between 1.50-1.70 and Abbe numbers between 25-50. This composite approach allows for effective aberration correction across the entire optical system without requiring excessive thickness.
2Reliability
If the number of lens elements is increased to correct optical aberrations, then optical aberrations are corrected, but the thickness of the optical imaging lens increases
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different regions and elements of the optical system. Each lens element has tailored surface curvatures, aspherical coefficients, and refractive properties optimized for its specific position in the optical path. For example, the first lens element has a convex object-side surface with specific curvature radius relationships (R1/R2 between -0.5 and -2.0) to handle incoming light differently than subsequent elements, allowing effective aberration correction at each stage rather than requiring all elements to contribute uniformly to correction.
Solution Approach 2:
The patent systematically controls aberration correction through parameter relationships between adjacent lens elements. Specific inequalities govern the interaction between elements, such as focal length ratios (f1/f2 between 0.5-2.0, f3/f4 between 0.5-2.0) and thickness distributions (T1/(T2+T3) between 0.9-1.5, T5/(T6+T7) between 1.0-2.0). These parameter constraints ensure that each element contributes optimally to aberration correction while maintaining a compact overall thickness.
3Reliability
If the distance between the first lens element and the image plane is increased to maintain good imaging quality, then imaging quality is maintained, but the thickness of the optical imaging lens increases
Solution Approach 1:
The patent applies dynamics by implementing a mobile lens mechanism where at least one lens element (typically the fifth element based on the thickness ratio constraints T5/(T6+T7) between 1.0-2.0 and the positioning of mobile lenses in modern optical systems) can move along the optical axis. This dynamic adjustment capability allows the system to maintain optimal imaging quality across different object distances and focus requirements without requiring a fixed large distance between the first lens element and the image plane, thereby reducing the overall thickness.
Solution Approach 2:
The patent optimizes the distance from the first lens element to the image plane through precise parameter control of all eight lens elements. The cumulative effect of optimized refractive indices, thicknesses, and focal lengths across all elements results in a shortened overall optical path length. The specific parameter relationships (such as T4+T5)/(G34+G45+G56) between 1.5-3.0 and BFL/Tmin between 3.0-8.0) enable compact design while maintaining imaging quality, allowing modern devices to achieve thin form factors without sacrificing optical performance.
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 solution achieves a shortened lens length with improved imaging quality by carefully optimizing the parameters and surface shapes of the lens elements, reducing aberrations and maintaining effective focal length and refractive index characteristics.
Implementation Method 1
Each of the first, second, third, fourth, fifth, sixth, seventh and eighth lens elements may have varying refracting power
Data Source
AI summary
Present embodiments provide for an optical imaging lens. The optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element a sixth lens element, a seventh lens element and a eighth lens element positioned sequentially from an object side to an image side. Through arrangement of convex or concave surfaces of the eight lens elements, the length of the optical imaging lens may be shortened while providing better optical characteristics and imaging quality.