Five-Lens Optical Assembly with +−−++ Power Configuration
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Solution Overview
Problem
Current lens assemblies fail to simultaneously achieve miniaturization, light weight, and high resolution while maintaining good optical performance.
Innovation Solution
A lens assembly comprising a sequence of lenses with specific refractive powers and surface curvatures, including positive and negative refractive power lenses arranged along an optical axis, satisfying conditions such as −13<R52/T5<−8 and 12 mm<f×(TC34/T5)<20 mm, to optimize total lens length, weight, and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution, then the resolution is improved, but the total lens length and weight increase
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of each lens element. Specifically, it sets the refractive powers of the five lenses in a +−−++ configuration and establishes specific ratio relationships between radii of curvature (e.g., R11/R12, R21/R22) and thickness ratios (e.g., T1/T2, T4/T5) to achieve high resolution with minimized total lens length. This systematic parameter optimization allows the lens assembly to achieve 0.3MPx resolution while keeping the total length under 10mm.
2Measurement precision
If the number of lenses is increased to improve resolution, then the resolution is improved, but the weight increases
Solution Approach 1:
The patent optimizes material selection and dimensional parameters to achieve high resolution with reduced weight. By carefully selecting refractive indices and Abbe numbers for each lens element and optimizing their thicknesses (T1-T5) and radii of curvature, the design achieves 0.3MPx resolution while minimizing the total weight of the five-lens assembly. The parameter optimization ensures that each lens element contributes maximally to resolution while minimizing its weight contribution.
3Length of moving object
If the total lens length is shortened to achieve miniaturization, then the total lens length is shortened, but the optical performance deteriorates
Solution Approach 1:
The patent systematically optimizes multiple parameters including refractive powers, radii of curvature, and thicknesses to maintain excellent optical performance in a compact form. By establishing specific ratio relationships between parameters (e.g., R11/R12 between 0.6-1.4, T1/T2 between 0.5-2.0) and using a balanced +−−++ refractive power configuration, the design achieves high resolution (0.3MPx), low distortion (under 5%), and minimal field curvature while keeping the total lens length under 10mm.
Solution Approach 2:
The patent divides the optical system into five distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized independently for specific functions: the first positive lens for light gathering, the negative lenses for aberration correction, and the final positive lens for focus. This segmented approach enables compact design while maintaining excellent optical performance through coordinated optimization of all elements.
4Length of moving object
If the lens assembly is miniaturized to reduce size, then the size is reduced, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent establishes specific ratio ranges for critical parameters to improve manufacturing precision. By defining acceptable ranges for radius of curvature ratios (R11/R12: 0.6-1.4, R21/R22: 0.6-1.4, R41/R42: 0.6-1.4) and thickness ratios (T1/T2: 0.5-2.0, T4/T5: 0.5-2.0), the design provides manufacturing tolerance guidance that ensures consistent optical performance. These ratio constraints help manufacturers control precision requirements while working with miniaturized dimensions, making the compact lens assembly manufacturable with standard precision capabilities.
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 shortens the total lens length, decreases weight, increases resolution, corrects aberration, and improves image quality by optimizing the refractive properties and manufacturing sensitivity of the lens assembly.
Implementation Method 1
The first lens is with positive refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with positive refractive power. The third lens is with negative refractive power and includes a convex surface facing the object side. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive 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, and a fifth lens. The first lens is with positive refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with positive refractive power. The third lens is with negative refractive power and includes a convex surface facing the object side. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side.