Compact Five-Lens Optical Imaging System for Portable Devices
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Solution Overview
Problem
Conventional optical imaging lens sets for portable electronic devices, such as mobile phones and cameras, are too large and fail to meet the demands for improved imaging quality due to their size and F-number specifications.
Innovation Solution
A compact optical imaging lens set with five lens elements, featuring specific refractive powers and surface shapes, including concave and convex portions on each lens element, optimized to reduce the overall length while maintaining high imaging quality, with carefully controlled air gaps and thickness ratios to achieve improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional telescopic optical imaging lens sets are used, then imaging quality can be achieved, but the lens set size becomes too large (length > 50 mm) to meet portable device requirements
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness ratios and air gap ratios of lens elements. Specifically, it sets T1/T2 between 0.60-1.50, T3/T2 between 0.50-1.50, T4/T2 between 0.50-1.50, G12/G23 between 0.50-2.00, and G23/G45 between 0.50-2.00. These parameter optimizations enable the lens set length to be reduced to under 50 mm while maintaining imaging quality with Fno between 2.00-4.00 and relative illumination between 80%-90%.
2Length of stationary object
If lens element thickness and air gaps are reduced to shorten the lens set, then compactness is improved, but optical performance deteriorates
Solution Approach 1:
The patent maintains optical performance by establishing specific parameter ranges: Fno between 2.00-4.00, relative illumination between 80%-90%, and precise thickness ratios (T1/T2: 0.60-1.50, T3/T2: 0.50-1.50, T4/T2: 0.50-1.50) and air gap ratios (G12/G23: 0.50-2.00, G23/G45: 0.50-2.00). These parameter optimizations ensure that even with reduced dimensions (length < 50 mm), the optical performance requirements are met.
Solution Approach 2:
The patent applies local quality by giving each lens element specific surface characteristics. The first lens element has a convex object-side surface and concave image-side surface; the second lens element has asymmetric surfaces; the third lens element has a convex object-side surface and concave image-side surface; the fourth lens element has a concave object-side surface and convex image-side surface. This localized optimization of each element's surface quality contributes to maintaining overall optical performance in the compact design.
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 results in a reduced optical imaging lens system length with maintained optical performance, enhancing imaging quality and meeting the specifications of current portable electronic devices by optimizing the arrangement of lens elements and air gaps.
Implementation Method 1
The optical imaging lens set exclusively has the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element with refractive power
Data Source
AI summary
An optical lens assembly includes a first lens of a concave image surface near its periphery, a second lens of a plastic material, a third lens of a concave object surface near the optical-axis and a concave image surface near its periphery, a fourth lens of a concave object surface near the optical-axis, a fifth lens of a concave object surface near its periphery and a convex image surface near the optical-axis.