Seven-Lens Optical Imaging System with Aperture Segmentation
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Solution Overview
Problem
Designing an optical imaging lens that achieves high image quality while meeting constraints of low distortion, small size, and cost-effectiveness, particularly for applications in portable devices and automotive systems where temperature variations affect image quality.
Innovation Solution
The optical imaging lens is composed of seven lenses arranged with specific refractive powers and surface shapes, including negative and positive meniscus and biconvex/biconcave lenses, with the seventh lens's radius of curvature and Abbe number optimized to satisfy L7R2/V7 < 1, along with an infrared filter to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve image quality and reduce distortion, then imaging performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The optical imaging lens is divided into two lens assemblies (first lens assembly with three lenses, second lens assembly with four lenses) separated by an aperture. This segmentation allows each assembly to be optimized independently for specific optical functions while managing overall system complexity.
Solution Approach 2:
Each lens within the assemblies has specifically tailored surface shapes (convex, concave, meniscus) and refractive powers assigned to different positions. For example, the first lens has a convex object-side surface and concave image-side surface, while the seventh lens has a concave object-side surface and convex image-side surface, creating local optical corrections throughout the system.
2Manufacturing precision
If the number of lenses is increased to reduce distortion, then distortion is reduced, but the size of the lens assembly increases
Solution Approach 1:
The lens design incorporates varying refractive powers and surface curvatures along the optical path, with lenses having different focal lengths and surface radii of curvature. This dynamic variation in optical properties allows for compact arrangement while achieving distortion correction.
Solution Approach 2:
The aperture is positioned between the two lens assemblies, creating a nested structure where the aperture is contained within the overall lens assembly. This nesting allows for compact packaging of the seven-lens system without proportionally increasing the overall length.
3Manufacturing precision
If specific lens configurations are used to improve image quality, then optical performance is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent specifies particular parameter relationships, such as L7R2/V7 < 1 where L7 is the focal length of the seventh lens, R2 is the radius of curvature of its object-side surface, and V7 is its Abbe number. These parameter constraints guide the selection of lens materials and geometries to achieve optimal performance while maintaining manufacturability.
Solution Approach 2:
The lens system uses multiple lenses with different refractive indices and Abbe numbers to correct chromatic aberrations and improve overall image quality. Each lens is made from optical materials selected to complement the others, creating a composite optical system that achieves high performance through material diversity.
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
This configuration achieves good image quality by optimizing refractive power arrangements and lens shapes, ensuring low distortion and high resolution within the specified constraints, as validated by optical simulation data.
Implementation Method 1
a first lens having negative refractive power, a second lens having negative refractive power, and a third lens having positive refractive power
Data Source
AI summary
An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens assembly, an aperture, and a second lens assembly. The first lens assembly includes a first lens that is a negative meniscus having negative refractive power, a second lens that is a biconcave lens having negative refractive power, and a third lens that is a biconvex lens having positive refractive power. The second lens assembly includes a fourth lens that is a biconvex lens having positive refractive power, a fifth lens that is a biconcave lens having negative refractive power, a sixth lens that is a biconvex lens having positive refractive power, and a seventh lens that is a negative meniscus having negative refractive power.