Six-Element Optical Lens Set Compact Design
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Solution Overview
Problem
Current optical imaging lens sets for portable devices, such as mobile phones and cameras, face challenges in reducing total length while maintaining good optical performance and production feasibility, especially under dim light conditions.
Innovation Solution
An optical imaging lens set with six lens elements is designed, featuring specific refractive powers, surface shapes, and air gaps to minimize total length while ensuring low flare and high optical performance, including a first lens element with a convex object-side surface, a second lens element with negative refractive power, and a sixth lens element with a convex image-side surface, along with optimized thickness and air gap ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the total length of the optical imaging lens set is reduced to shrink mobile phones and digital cameras, then the device size is reduced, but the imaging quality deteriorates especially under dim light conditions
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness ratios of lens elements (T2/T1, T3/T2, T4/T3, T5/T4, T6/T5) and air gap ratios (G23/T1, G34/T2, G45/T3, G56/T4) within specific ranges. This systematic parameter optimization allows the lens set to achieve compact dimensions while maintaining proper light transmission and focusing capabilities for good imaging quality
Solution Approach 2:
The patent makes each lens element serve multiple functions: the first lens element with positive refractive power both converges light and helps correct spherical aberration; the second lens element with negative refractive power both diverges light and corrects chromatic aberration; the third lens element with positive refractive power both converges light and corrects field curvature. This multi-functionality allows compact design without sacrificing imaging performance
2Length of stationary object
If the total length of the optical imaging lens set is reduced, then the device size is reduced, but the system aberration improvement becomes difficult
Solution Approach 1:
The patent applies local quality by giving each lens element specific surface shape characteristics tailored to its position and function: the first lens element has a convex object-side surface and concave image-side surface; the second lens element has convex surfaces on both sides; the third lens element has a concave object-side surface and convex image-side surface. This localized optimization of surface geometry allows each element to contribute to aberration correction while maintaining compact overall dimensions
3Length of stationary object
If the lens elements are made thinner to reduce total length, then the device size is reduced, but the production feasibility and assembly yield decrease
Solution Approach 1:
The patent applies parameter changes by establishing minimum thickness ratios (each lens element thickness relative to the previous one must be ≥0.3) and maximum air gap ratios (each air gap relative to the previous lens element thickness must be ≤0.7). These parameter constraints ensure that lens elements remain thick enough for manufacturability while keeping the overall lens set compact, and air gaps are optimized for both assembly feasibility and optical 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 design achieves a smaller total length with improved imaging quality and reduced flare, effectively addressing the challenges of miniaturization and production feasibility, while maintaining good optical performance and a wider field angle.
Implementation Method 1
an optical imaging lens set of six lens elements from an object side toward an image side in order along an optical axis has a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Each lens element has an object-side surface facing toward an object side as well as an image-side surface facing toward an image side
Data Source
AI summary
An optical lens set includes no air gap between the first lens element and the second lens element, the third lens element of a concave object-side surface near its optical-axis, and the sixth lens element of a convex image-side surface near its periphery. The Abbe number ν3 of the third lens element and the Abbe number ν5 of the fifth lens element satisfy |ν3−ν5|≤25.