Wide-Angle Lens Refractive Power Distribution for Low Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wide-angle lenses suffer from large f-θ distortions, difficulty in correcting peripheral aberrations due to large light incident angles, sensitivity of MTF to tolerances, and low assembly yield.
Innovation Solution
A wide-angle lens design comprising a first group with negative refractive power, a stop, a second group with positive refractive power, a third group with positive refractive power, and a filter, where the second group uses two lenses to share refractive power and the third group includes a cemented doublet to eliminate chromatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single lens is used with large refractive power to achieve wide angle, then the field of view is large, but the tolerance sensitivity increases and assembly yield decreases
Solution Approach 1:
The patent divides the optical system into multiple lens groups (first group with negative refractive power, second group with positive refractive power, third group with positive refractive power) instead of using a single lens. This segmentation distributes the refractive power across multiple components, reducing the burden on each individual lens and lowering tolerance sensitivity while maintaining the wide field of view.
Solution Approach 2:
The patent changes the refractive power parameters of individual lenses within the lens groups. By optimizing the refractive power distribution across multiple lenses (e.g., first lens with negative refractive power, fourth and fifth lenses sharing positive refractive power), the system achieves the desired wide angle while reducing the sensitivity to manufacturing tolerances.
2Adaptability or versatility
If conventional wide-angle lens design is used, then the field of view is wide, but f-θ distortion is large
Solution Approach 1:
The patent segments the optical system into multiple lens groups with specific functions. The first group with negative refractive power and the subsequent groups with positive refractive power work together to correct f-θ distortion while maintaining a wide field of view, achieving better image quality across the entire field.
Solution Approach 2:
Different lens groups are designed with different local optical properties. The first lens group focuses on distortion correction, while the second and third groups contribute to overall image quality and field of view. This localized optimization of optical properties enables simultaneous achievement of wide field of view and low distortion.
3Adaptability or versatility
If conventional wide-angle lens design is used, then the field of view is wide, but peripheral aberrations are difficult to correct due to large light incident angle
Solution Approach 1:
The patent divides the optical system into multiple lens groups where each group contributes to correcting peripheral aberrations. The first group with negative refractive power helps control light angles, while the subsequent groups with positive refractive power further correct aberrations, achieving reliable image quality even at wide field angles.
Solution Approach 2:
The patent optimizes the refractive power parameters of each lens group to specifically address peripheral aberration correction. By carefully selecting the refractive power values and signs (negative for first group, positive for second and third groups), the system effectively corrects aberrations at the periphery while maintaining a wide field of view.
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 design achieves small distortion, high resolution, large field of view, and low sensitivity to tolerance, significantly improving assembly yield by distributing refractive power effectively across multiple lenses.
Implementation Method 1
a first group with a negative refractive power, a stop, a second group with a positive refractive power
Implementation Method 2
a second group with a positive refractive power
Implementation Method 3
The sixth lens and the seventh lens are cemented to form a cemented doublet
Data Source
AI summary
The disclosure provides a wide-angle lens, a camera module and a camera. The wide-angle lens sequentially includes a first group, a stop, a second group, a third group and a filter. The first group sequentially includes a first lens with a negative refractive power, a second lens with a negative refractive power, and a third lens with a refractive power. The first lens is a meniscus lens. The second lens has a concave image side surface. The second group sequentially includes a fourth lens with a positive refractive power and a fifth lens with a positive refractive power, an image side surface of the fourth lens and an image side surface of the fifth lens are both convex. The third group sequentially includes a cemented doublet and an eighth lens. The eighth lens is a bi-convex lens.