Five-Lens Optical Assembly Abbe Number Optimization
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Solution Overview
Problem
Current lens assemblies for digital still cameras and mobile phones face challenges in achieving miniaturization and high resolution while maintaining optical performance, as traditional designs with five lenses do not fully meet the requirements of miniaturization and high resolution.
Innovation Solution
A lens assembly comprising five lenses, where the first, second, third, fourth, and fifth lenses are arranged sequentially with specific refractive powers and Abbe numbers, and include aspheric surfaces, allowing for a shortened total lens length and improved optical performance by satisfying specific conditions for focal lengths and radius of curvature ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional five-lens assembly is used, then optical performance can be maintained, but total lens length becomes too long for miniaturization requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of the five lenses according to specific formulas. By carefully selecting and adjusting these optical parameters, the lens assembly achieves shortened total length while maintaining correction of chromatic aberration and other optical imperfections, thus resolving the contradiction between miniaturization and optical performance.
Solution Approach 2:
The patent uses composite material principles by combining lenses with different materials having specific refractive index ranges (1.50-1.70, 1.70-1.80, 1.80-2.00) and different Abbe number ranges. This composite approach allows the five-lens system to achieve both compact size and high optical performance through material diversity and optimization.
2Measurement precision
If more lenses are added to improve resolution, then optical performance improves, but device complexity increases
Solution Approach 1:
The patent optimizes the optical parameters (refractive indices n1-n5 and Abbe numbers ν1-ν5) of the five lenses according to specific mathematical formulas and ranges. This parameter optimization enables the lens assembly to achieve high resolution and effective aberration correction without requiring additional lenses, thus improving resolution while controlling device complexity.
3Length of moving object
If lenses with high refractive power are used to shorten focal length, then miniaturization is achieved, but chromatic aberration increases
Solution Approach 1:
The patent converts the harmful effect of chromatic aberration into a benefit by using the dispersion properties of different lens materials. By arranging five lenses with specific refractive indices and Abbe numbers, the design utilizes chromatic dispersion to achieve both short focal length and effective chromatic aberration correction through the combined optical paths of multiple materials.
Solution Approach 2:
The patent employs composite material principles by combining lenses with different refractive index ranges and Abbe number ranges. This material composition strategy enables the lens system to achieve short focal length while correcting chromatic aberration through the complementary optical properties of the different materials used in the five lenses.
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 achieves excellent optical performance with corrected aberrations and increased resolution, meeting the demands of miniaturization and high resolution while maintaining a compact design.
Implementation Method 1
The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side.
Implementation Method 2
An Abbe number of the first lens, an Abbe number of the third lens and an Abbe number of the fifth lens are greater than an Abbe number of the second lens
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. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens includes a concave surface facing the image side. The first lens and the third lens are made of the same material and an Abbe number of the first lens is the same as an Abbe number of the third lens. An Abbe number of the first lens, an Abbe number of the third lens and an Abbe number of the fifth lens are greater than an Abbe number of the second lens.