Aspherical Optical Lens Groups for Compact Wide-Angle Imaging
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Solution Overview
Problem
Existing wide-angle lenses face challenges in miniaturization due to lens shape and material limitations, and suffer from poor imaging quality with a wide field of view and large aperture.
Innovation Solution
An optical lens design featuring a front lens group with at least two aspherical lenses and a rear lens group including adhered and aspheric lenses, with specific diopter configurations and materials, reducing the total lens count while maintaining a wide field of view and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens designs are used, then the lens can achieve a wide field of view, but the lens size cannot be reduced due to shape and material limitations
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with positive optical power, second lens group with negative optical power, third lens group with positive optical power) rather than using a single conventional lens design. This segmentation allows each group to contribute differently to the overall optical performance, enabling miniaturization while maintaining wide field of view capability.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses within the lens groups. These aspherical surfaces replace traditional spherical surfaces to correct optical aberrations and enable compact lens design. The aspherical curvature allows for reduced lens thickness and overall size while maintaining the ability to capture wide field of view.
2Manufacturing precision
If a wide field of view and large aperture are used, then the lens can capture more light and scene, but the imaging quality deteriorates
Solution Approach 1:
Different lens groups are assigned different optical powers and functions: the first lens group provides positive power for light convergence, the second lens group provides negative power for field expansion, and the third lens group provides positive power for final focusing. This local differentiation of optical properties allows the system to simultaneously achieve wide field of view, large aperture, and high imaging quality by optimizing each group's contribution.
Solution Approach 2:
The patent uses lens elements with different refractive indices and Abbe numbers (e.g., Nd1=1.50-1.70 with Vd1=30-60, Nd2=1.60-1.80 with Vd2=25-50) to construct the lens groups. This composite approach with optically dissimilar materials enables correction of chromatic and spherical aberrations across the wide field of view and large aperture, thereby maintaining high imaging quality.
3Manufacturing precision
If more lenses are added to improve imaging quality, then the optical aberrations can be corrected, but the device complexity increases
Solution Approach 1:
Multiple lens elements with different optical properties are merged into three integrated lens groups. Rather than using many separate lenses, the patent combines them into structured groups where the first, second, and third groups work together as a unified optical system. This merging reduces overall complexity while maintaining aberration correction capability.
Solution Approach 2:
Each lens group serves multiple functions: the first lens group not only converges light but also contributes to aberration correction; the second lens group expands the field while maintaining focus; the third lens group focuses the final image while correcting residual aberrations. This multi-functionality of each group reduces the need for additional dedicated correction lenses.
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 effectively reduces lens quantity, improves optical aberrations, and lowers manufacturing costs while maintaining excellent imaging performance and resistance to environmental changes.
Implementation Method 1
The plurality of front lenses include at least two aspherical lenses... one of the at least two aspherical lenses is a negative lens and has a surface facing an image side, another one of the at least two aspherical lenses is a negative lens and has a surface facing an object side
Implementation Method 2
The plurality of rear lenses include a first rear lens and a second rear lens sequentially arranged from the object side toward the image side, the first rear lens being an adhered lens... An absolute value of a difference between a dispersion coefficient of the middle lens piece and a dispersion coefficient of the front lens piece and the rear lens piece is greater than 30
Data Source
AI summary
An optical lens includes a front lens group, a rear lens group, and an aperture. The front lens group includes front lenses that include at least two aspherical lenses. The rear lens group includes rear lenses that include at least one adhered lens and an aspheric lens. The aperture is located between the front lens group and the rear lens group. The front lens group and the rear lens group have positive diopters, and a total quantity of lenses of the plurality of front lenses and the plurality of rear lenses is at least four. The optical lens meets a condition of: 0.6>an effective focal length of the front lens group/an effective focal length of the rear lens group>0.35.