Wide-Angle Lens Assembly Aberration Correction
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Solution Overview
Problem
Wide-angle lens assemblies struggle to achieve a balance of large view angle, large aperture, short total length, and high resolution, failing to meet current application requirements.
Innovation Solution
A wide-angle lens assembly comprising specific lenses with varying refractive powers and curvatures, arranged along an optical axis, and satisfying specific conditions such as 12.7<TTL/f<12.9 and 19.5<Vd2/Nd2<22.5, which includes a meniscus lens, biconcave and biconvex lenses, and a doublet lens configuration, to achieve miniaturization and chromatic aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the view angle and aperture are increased to meet application requirements, then the optical performance is improved, but the total length of the lens assembly increases
Solution Approach 1:
The lens assembly is divided into nine individual lens elements with specific refractive powers (negative, positive, and mixed), arranged in a segmented configuration along the optical axis. This segmentation allows each lens to contribute differently to the overall optical performance, enabling a large view angle and aperture while controlling the total length through optimized individual element design
Solution Approach 2:
The patent applies specific parameter constraints including 12.7<TTL/f<12.9 (where TTL is total track length and f is focal length) and 19.5<Vd2/Nd2<22.5 (where Vd2 is Abbe number and Nd2 is refractive index of the second lens). These parameter changes and optimizations enable the lens assembly to achieve large view angle and aperture while maintaining a compact total length
2Length of moving object
If the total length is reduced to achieve miniaturization, then the compactness is improved, but the resolution and optical performance deteriorate
Solution Approach 1:
Different lens elements are assigned specific local qualities: the first lens has negative refractive power with a convex object-side surface, the second lens has negative refractive power, the third lens has negative refractive power, while lenses four through nine have positive refractive power. This local quality differentiation allows each region of the lens assembly to contribute optimally to resolution while maintaining overall compactness
Solution Approach 2:
The lens assembly uses composite optical design combining lenses with different refractive powers and material properties (different Abbe numbers and refractive indices). This composite approach, particularly with the second lens having 19.5<Vd2/Nd2<22.5, enables high resolution in a compact form factor by correcting chromatic and spherical aberrations through material composition
3Illumination intensity
If the lens configuration is optimized for large aperture, then the light gathering ability is improved, but the aberration increases
Solution Approach 1:
The patent converts the harmful effect of aberrations caused by large aperture into a benefit by strategically placing lenses with negative refractive power (first, second, and third lenses) at the object side to correct spherical and chromatic aberrations. The negative power lenses compensate for the aberrations introduced by the large aperture, while the subsequent positive power lenses (fourth through ninth) focus the light, effectively converting the aberration problem into improved optical performance
Solution Approach 2:
The third lens, positioned between the negative power first/second lenses and the positive power fourth-ninth lenses, acts as an intermediary element. This lens helps transition the light path and works in conjunction with the other lenses to balance the optical forces, mediating between the aperture-lowering negative power lenses and the focus-providing positive power lenses to reduce overall aberration
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 enables a wider view angle, effective correction of aberrations, and increased resolution while maintaining a short total length, achieving optimal optical performance.
Implementation Method 1
The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side.
Data Source
AI summary
A wide-angle lens assembly comprises 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 fifth lens and a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The first lens is a meniscus lens with refractive power. The second lens is a meniscus lens with refractive power. The third lens has refractive power and includes a concave surface facing the object side. The fourth lens has positive refractive power and includes a convex surface facing the image side. The fifth lens has refractive power. The sixth lens is a biconvex lens with positive refractive power. The seventh lens has refractive power. The eighth lens has positive refractive power. The ninth lens has positive refractive power.