Six-Element Optical Imaging Lens Shortened Length Thermal Stability
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Solution Overview
Problem
Designing an optical imaging lens with a shorter length while maintaining good optical characteristics and thermal stability is challenging, especially for lenses with six elements, as size reduction affects optical performance and thermal stability, particularly in varying temperature environments.
Innovation Solution
The optical imaging lens is designed with specific convex and concave surface shapes and refracting powers for its elements, satisfying certain inequalities to broaden the half field of view and enhance thermal stability while maintaining imaging quality, using a combination of glass and plastic materials for certain lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size of each lens element is decreased proportionally to reduce lens length, then the lens length is shortened, but the optical characteristics deteriorate
Solution Approach 1:
The patent applies local quality by giving different surface shape configurations to different lens elements. Specifically, the first lens element has a convex object-side surface and concave image-side surface, while the second lens element has concave object-side surface and convex image-side surface. This localized differentiation of surface properties allows each element to contribute optimally to image quality while maintaining a compact overall length.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the refractive indices and Abbe numbers of different lens elements. The first lens element has refractive index 1.5 < n1 ≤ 1.9 and Abbe number 20 < V1 ≤ 40, while the second lens element has 1.4 < n2 ≤ 1.7 and 30 < V2 ≤ 60. These parameter specifications enable the lens to achieve good optical performance in a shortened configuration.
2Reliability
If the lens elements are arranged with larger air gaps to maintain optical performance, then the imaging quality is improved, but the lens length increases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the refractive indices and Abbe numbers of the lens elements. The first lens element has refractive index 1.5 < n1 ≤ 1.9 and Abbe number 20 < V1 ≤ 40, while the second lens element has 1.4 < n2 ≤ 1.7 and 30 < V2 ≤ 60. These parameter specifications enable the lens to achieve good optical performance in a shortened configuration.
3Ease of manufacture
If the lens structure is simplified to reduce manufacturing difficulty, then the production difficulty is reduced, but the thermal stability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different surface configurations to different lens elements. The first lens element has a convex object-side surface and concave image-side surface, while the second lens element has concave object-side surface and convex image-side surface. This localized differentiation maintains manufacturing feasibility while achieving thermal stability through proper optical design.
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 effectively shortens the lens length, broadens the half field of view, and provides good thermal stability, ensuring high imaging quality and reduced focal shift across temperature variations.
Implementation Method 1
Each of the lens elements has refracting power
Data Source
AI summary
Present embodiments provide for optical imaging lenses. An optical imaging lens may comprise six lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics, the total length of the optical imaging lens may be shortened and the performance of athermalization may be improved.