Four-Lens Optical Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Current lens assemblies fail to achieve both miniaturization and high resolution while maintaining good optical performance.
Innovation Solution
A lens assembly comprising a specific arrangement of lenses with varying refractive powers and a stop, optimized through conditions such as focal lengths, air intervals, and radius of curvature, to achieve a shortened total lens length and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the total lens length is shortened, then miniaturization is achieved, but optical performance deteriorates
Solution Approach 1:
The lens assembly is divided into multiple lens units with different refractive powers (positive and negative lenses) arranged in sequence. Each lens unit contributes to correcting specific optical aberrations, allowing the system to achieve compact length while maintaining optical performance through segmented optical correction.
Solution Approach 2:
The patent optimizes specific parameters including the ratio of focal lengths (f1+f3)/f2, air intervals between lenses (TC23, TC34), and radius of curvature ratios (R41/R11) to achieve the desired balance between compact length and optical performance. These parameter optimizations enable the lens assembly to be miniaturized without sacrificing image quality.
2Length of stationary object
If the total lens length is shortened, then miniaturization is achieved, but resolution deteriorates
Solution Approach 1:
The lens assembly is divided into multiple lens units with different refractive powers (positive and negative lenses) arranged in sequence. Each lens unit contributes to correcting specific optical aberrations, allowing the system to achieve compact length while maintaining optical performance through segmented optical correction.
Solution Approach 2:
The patent optimizes specific parameters including the ratio of focal lengths (f1+f3)/f2, air intervals between lenses (TC23, TC34), and radius of curvature ratios (R41/R11) to achieve the desired balance between compact length and optical performance. These parameter optimizations enable the lens assembly to be miniaturized without sacrificing image quality.
3Reliability
If multiple lenses with different refractive powers are arranged in sequence, then optical performance is improved, but device complexity increases
Solution Approach 1:
The lens assembly design integrates multiple functions into a compact structure where each lens unit serves multiple purposes: correcting specific aberrations, controlling light paths, and contributing to overall focal length optimization. This multi-functionality reduces the need for separate components, thereby managing complexity while improving optical performance.
Solution Approach 2:
The patent optimizes specific parameters including the ratio of focal lengths (f1+f3)/f2, air intervals between lenses (TC23, TC34), and radius of curvature ratios (R41/R11) to achieve the desired balance between compact length and optical performance. These parameter optimizations enable the lens assembly to be miniaturized without sacrificing 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 solution results in a lens assembly with enhanced optical performance, corrected aberrations, and increased resolution, meeting the requirements of miniaturization and high resolution.
Implementation Method 1
The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with refractive power. The fourth lens is with negative refractive power.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from an object side to an image side along an optical axis. The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with refractive power. The fourth lens is with negative refractive power. The lens assembly satisfies: 0.2<D4/TTL<0.6, wherein D4 is an effective diameter of the fourth lens and TTL is an interval from an object side surface of the first lens to an image plane along the optical axis.