Five-Lens Optical Imaging System with Concave-Convex Surfaces
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a longer total length with a smaller F-number while maintaining imaging quality, which complicates fabrication and yield improvement.
Innovation Solution
A five-lens element optical imaging lens design with specific surface shapes and refractive powers, including concave and convex portions, and controlled air gaps, to optimize the total thickness and effective focal length, ensuring good optical function and easier fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the total length of the telescopic lens is increased to achieve higher zoom ratio, then the zoom ratio is improved, but the F number increases resulting in smaller light flux
Solution Approach 1:
The patent changes the optical parameters by introducing a five-element lens design with specific refractive powers and surface curvatures. The fifth lens element has negative refractive power and larger thickness, which helps reduce the F number while maintaining the telescopic length, thereby increasing light flux without sacrificing zoom ratio
Solution Approach 2:
The patent uses composite lens design combining five different lens elements with varying refractive indices and Abbe numbers. This composite structure allows optimization of both the zoom ratio and light flux by distributing optical functions across multiple elements with different material properties
2Measurement precision
If the total length of the telescopic lens is increased to maintain imaging quality, then the imaging quality is improved, but the fabrication difficulty increases
Solution Approach 1:
The patent divides the optical system into five separate lens elements instead of using a single complex lens. This segmentation allows each element to be manufactured independently with simpler requirements, reducing overall fabrication difficulty while maintaining high imaging quality through the combined optical effect of all elements
3Illumination intensity
If the total length of the telescopic lens is increased to achieve smaller F number, then the light flux is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (focusing, field curvature correction, astigmatism correction, distortion control) into a single integrated five-element lens assembly. This merging approach achieves the desired light flux and F number reduction without requiring separate mechanical adjustment mechanisms, thereby limiting the increase in device complexity
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 design effectively reduces lens length, enhances telescopic properties, and improves imaging quality while facilitating easier assembly and fabrication, achieving better optical performance and yield.
Implementation Method 1
Each lens element from the first lens element to the fifth lens element respectively has an object-side surface which faces toward an object side to allow an imaging ray to pass through as well as an image-side surface which faces toward an image side to allow the imaging ray to pass through
Data Source
AI summary
An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T2 and an air gap G34 is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G34≤12.000 and ALT/T2≤12.900.