Multi-element Lens Assembly for Wide Field of View and Compact Length
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Solution Overview
Problem
Current lens assemblies with wide field of view face challenges in miniaturization and achieving small F-number while maintaining good optical performance.
Innovation Solution
A lens assembly comprising specific lenses with refractive powers arranged along an optical axis, including meniscus, biconcave, and biconvex lenses, with aspheric surfaces and a stop, optimized to achieve a shortened total lens length, increased field of view, and decreased F-number, using glass materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens assembly is designed with wide field of view (more than 200 degrees), then the field of view is improved, but the total lens length and diameter become large
Solution Approach 1:
The lens assembly is divided into multiple lens elements (first lens L11, second lens L12, third lens L13, fourth lens L14, fifth lens L15, sixth lens L16, seventh lens L17, eighth lens L18) with different refractive powers and functions. Each lens element contributes to correcting specific aberrations and achieving the wide field of view, allowing the system to maintain compact size while providing 200 degrees or more field of view
Solution Approach 2:
Different lens elements have different refractive powers (positive and negative) and surface curvatures tailored to their specific positions in the optical path. The first and second lenses have negative refractive power with specific curvature relationships, while the third lens has positive refractive power, and subsequent lenses have varying powers to correct field curvature and distortion locally across the wide field of view
2Adaptability or versatility
If a lens assembly is designed with wide field of view (more than 200 degrees), then the field of view is improved, but the diameter becomes large
Solution Approach 1:
The lens assembly is divided into multiple lens elements (first lens L11, second lens L12, third lens L13, fourth lens L14, fifth lens L15, sixth lens L16, seventh lens L17, eighth lens L18) with different refractive powers and functions. Each lens element contributes to correcting specific aberrations and achieving the wide field of view, allowing the system to maintain compact size while providing 200 degrees or more field of view
Solution Approach 2:
Multiple lens elements are nested along the optical axis in a compact arrangement, with each subsequent lens element positioned within the optical path of the previous ones. This nested configuration allows the diameter to be controlled while achieving the required wide field of view through the cumulative effect of multiple curved surfaces
3Illumination intensity
If a lens assembly is designed with small F-number, then the light gathering ability is improved, but the lens complexity and size increase
Solution Approach 1:
Different lens elements have different refractive powers (positive and negative) and surface curvatures tailored to their specific positions in the optical path. The first and second lenses have negative refractive power with specific curvature relationships, while the third lens has positive refractive power, and subsequent lenses have varying powers to correct field curvature and distortion locally across the wide field of view
Solution Approach 2:
The lens assembly uses multiple lens elements with different refractive indices and dispersion properties (achromatic design). The sixth lens L16 and seventh lens L17 are cemented together to form an achromatic doublet, combining materials with different optical properties to correct chromatic aberration while maintaining a compact structure with small F-number
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 aberrations, maintains excellent optical performance, and meets the requirements of miniaturization and wide field of view, as demonstrated by specific optical specifications and diagrams.
Implementation Method 1
The first lens is a meniscus lens with refractive power. The second lens is a meniscus lens with refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power.
Data Source
AI summary
A lens assembly includes sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens is a meniscus lens with refractive power. The second lens is a meniscus lens with refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with positive refractive power. The sixth lens and the seventh lens are cemented together.