Three-Lens Optical Assembly for Wide Angle Miniaturization
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Solution Overview
Problem
Existing lens assemblies face challenges in achieving miniaturization while maintaining high imaging quality and a broad field angle, as miniaturization often results in a narrow field angle and increased aberration when attempting to enlarge it, degrading imaging quality.
Innovation Solution
A lens assembly comprising a first positive refractive power lens, a second negative refractive power lens, and a third positive refractive power lens, optimized by specific focal length and curvature radius ratios, along with a diaphragm arrangement, to achieve a broad field angle, miniaturization, and high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized, then the total track length is reduced, but the field angle becomes narrow
Solution Approach 1:
The lens assembly is divided into three distinct lens units with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical performance, enabling the system to achieve a broad field angle while maintaining a compact total track length through optimized distribution of optical functions across multiple elements.
Solution Approach 2:
The patent applies specific parameter relationships including tan(HFOV)>0.74 for broad field angle, TTL/ImgH<1.7 for miniaturization, and constrained curvature radius ratios |(R1+R2)/(R1-R2)|<0.61 and |(R5+R6)/(R5-R6)|>4.02 to balance field angle and size. These parameter optimizations enable the lens assembly to achieve both compact dimensions and wide angular coverage simultaneously.
2Area of moving object
If the field angle is enlarged by changing lens diopter, then the field angle increases, but aberration worsens
Solution Approach 1:
By dividing the optical system into three lens units with alternating positive and negative refractive powers, the patent distributes aberration correction across multiple elements. The first positive lens provides focusing power, the second negative lens corrects field curvature and distortion, and the third positive lens fine-tunes the image quality, collectively achieving broad field angle coverage with controlled aberrations.
Solution Approach 2:
The patent constrains specific parameter relationships including focal length ratios f1/f<0.8 and f2/f>-0.8, curvature radius ratios |(R1+R2)/(R1-R2)|<0.61 and |(R5+R6)/(R5-R6)|>4.02, and thickness ratios to optimize the balance between field angle and aberration control. These parameter optimizations ensure that each lens contributes appropriately to both field coverage and image quality.
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 balances miniaturization with high imaging quality and a broad field angle, controlling aberrations within reasonable limits to ensure excellent imaging performance.
Implementation Method 1
a first lens E1 of a positive refractive power, an object side S1 of the first lens E1 is of a convexity; a second lens E2 of a negative refractive power; and a third lens E3 of a positive refractive power
Data Source
AI summary
A lens assembly includes a first lens, a second lens and a third lens from an object side of the lens assembly to an image side of the lens assembly, in turn. The first lens has a positive refractive power and object side with a convexity; the second lens has a negative refractive power; and the third lens has a positive refractive power. The lens assembly has characteristics such as broad filed angle (wide angle), miniaturization and high imaging quality.