Six-Lens Optical Assembly for Miniaturized High-Resolution Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lens assemblies fail to meet the requirements of miniaturization, small field of view, and high resolution simultaneously while maintaining good optical performance.
Innovation Solution
A lens assembly comprising multiple lenses with specific refractive powers and surface curvatures, arranged along an optical axis, including a stop, to achieve a shortened total lens length, decreased field of view, and increased resolution, while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the lens size is reduced, but the resolution and optical performance deteriorate
Solution Approach 1:
The lens assembly is divided into six individual lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6) with different refractive powers and surface curvatures. Each lens element contributes to correcting specific aberrations, allowing the system to maintain high resolution despite the compact overall length of 6.688mm.
Solution Approach 2:
The patent employs precise control of optical parameters including refractive indices (Nd1=1.5896, Nd2=1.6362, Nd3=1.5355, Nd4=1.5176), Abbe numbers (Vd1=61.2, Vd2=23.9, Vd3=55.7, Vd4=64.2), and surface curvatures (R12=1.852mm, R13=16.186mm, R24=2.591mm, R25=1.429mm, etc.) to optimize the optical performance of each lens element, achieving high resolution in a miniaturized configuration.
2Adaptability or versatility
If the field of view is reduced to achieve small field of view requirement, then the application requirements are met, but the optical design complexity increases
Solution Approach 1:
The lens elements feature asymmetric surface curvatures tailored for a specific narrow field of view of 43.98 degrees. For example, the first lens has R12=1.852mm on the object side and R13=16.186mm on the image side, creating asymmetric light path control that optimizes performance for the targeted small field of view application.
Solution Approach 2:
The patent provides multiple embodiment options with different lens configurations (e.g., varying the number of lenses from 4 to 6 elements, different stop positions, different surface curvature combinations) that can be dynamically selected based on specific application requirements, allowing adaptation to different small field of view needs.
3Reliability
If multiple lenses with specific curvatures are added to correct aberrations, then the optical performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for manufacturing, including surface curvatures (e.g., R41=2.103mm, R42=27.234mm with ratio constraint), thicknesses (e.g., d12=0.395mm, d13=0.050mm), and material properties (Nd, Vd). These controlled parameter variations enable aberration correction while providing manufacturing tolerances for practical production.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with optimized optical design, using fixed lens elements with pre-determined curvatures and positions. The aberration correction is achieved through the inherent optical properties of the lens materials and shapes rather than adjustable mechanical components, simplifying manufacturing while maintaining performance.
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 lens assembly effectively achieves a shortened total lens length, decreased field of view, and increased resolution, while maintaining excellent optical performance by satisfying specific conditions related to focal lengths, radii of curvature, and Abbe numbers, thereby correcting longitudinal spherical aberration, astigmatic field curves, and distortion.
Implementation Method 1
The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with negative refractive power and includes a concave surface facing the image side. The third lens is with refractive power and includes a convex surface facing the image side.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with negative refractive power and includes a concave surface facing the image side. The third lens is with refractive power and includes a convex surface facing the image side. The fourth, fifth, and sixth lenses are with refractive power. The lens assembly satisfies: 2 mm<f5+f6<35 mm, wherein f5 is an effective focal length of the fifth lens and f6 is an effective focal length of the sixth lens.