Three-Lens Optical Assembly for Peripheral Brightness and Compact Design
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Solution Overview
Problem
Current lens assemblies face challenges in achieving high peripheral brightness while maintaining miniaturization, large field of view, and large stop, particularly in night environment applications due to insufficient brightness at large incident angles.
Innovation Solution
A lens assembly comprising a first lens with negative refractive power and a concave surface facing the image side, a second lens with positive refractive power and a convex surface facing the image side, and a third lens with positive refractive power and a convex surface facing the object side, arranged along an optical axis, satisfying specific curvature and focal length conditions to enhance peripheral brightness and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lens assembly uses a large stop and large incident angle to achieve larger field of view and miniaturization, then the field of view and compactness are improved, but the peripheral image brightness becomes insufficient
Solution Approach 1:
The patent applies local quality by giving different surface curvatures to different regions of the lenses. Specifically, the first lens has a concave image-side surface with a specific radius of curvature (R12), the second lens has a convex image-side surface (R24) and convex object-side surface (R21), and the third lens has a convex object-side surface (R31). These locally optimized curvature distributions redirect light rays to improve peripheral brightness while maintaining the large field of view and compact form factor.
2Length of moving object
If the lens assembly is miniaturized with shorter total length, then the compactness is improved, but the optical performance and image quality may deteriorate
Solution Approach 1:
The patent employs parameter changes by precisely controlling the radius of curvature parameters of various lens surfaces. The specified ranges (3.5≤R21/f≤8, 14≤R11/f≤20.5, 2.4≤R11/R21≤3.9, 8.4mm≤R11/(f2/f3)≤14.5mm, 24°/mm≤HFOV/f3≤35°/mm) optimize the optical path within the compact structure. These parameter optimizations ensure that despite the reduced total length, the lens assembly maintains good optical performance including corrected aberrations and acceptable image quality.
3Illumination intensity
If the lens assembly uses multiple lens elements with specific curvature configurations, then the peripheral brightness and field of view are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the optical system into three distinct lens elements (first lens, second lens, and third lens), each with specific refractive power and surface curvature characteristics. This segmentation allows each lens to perform a specialized function in controlling light paths, thereby achieving high peripheral brightness and large field of view. The modular three-lens structure also facilitates standardized manufacturing processes for each individual lens element.
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 effectively decreases total lens length, increases field of view, enhances peripheral image brightness, and corrects aberrations, improving optical performance and manufacturing efficiency.
Implementation Method 1
The first lens is with negative refractive power and includes a concave surface facing an image side
Implementation Method 2
The second lens is with positive refractive power and includes a convex surface facing the image side
Implementation Method 3
The third lens is with positive refractive power and includes a convex surface facing an object side
Data Source
AI summary
A lens assembly includes a first lens, a second lens, and a third lens. The first lens is with negative refractive power and includes a concave surface facing an image side. The second lens is with positive refractive power and includes a convex surface facing the image side. The third lens is with positive refractive power and includes a convex surface facing an object side. The first lens, the second lens, and the third lens are arranged in order from the object side to the image side along an optical axis. The lens assembly satisfies the following condition: 3.5≤R21/≤8; wherein R21 is a radius of curvature of an object side surface of the second lens and f is an effective focal length of the lens assembly.