Six-Lens Optical Assembly for Large Aperture and Temperature Stability
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Solution Overview
Problem
Existing lens assemblies fail to simultaneously achieve large aperture, high resolution, and resistance to environmental temperature changes, which are essential for modern applications.
Innovation Solution
A lens assembly comprising a specific arrangement of six lenses with varying refractive powers and surface orientations, including convex and concave surfaces, arranged along an optical axis, with specific focal length ratios and conditions to optimize optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to achieve large aperture, then the F-number decreases, but the resolution and temperature resistance deteriorate
Solution Approach 1:
The lens assembly is divided into six individual lens elements (L1-L6) with different refractive powers and surface curvatures. Each lens element is optimized for specific functions: L1 and L2 for light gathering, L3 and L4 for aberration correction, L5 for focal length control, and L6 for chromatic aberration correction. This segmentation allows the system to achieve large aperture while maintaining high resolution through coordinated optimization of each element.
Solution Approach 2:
Different lens elements have different local optical properties tailored to their specific positions and functions. For example, L4 has negative refractive power with specific concave-convex configuration to correct spherical aberration, while L6 has positive refractive power with convex-concave configuration to correct chromatic aberration. This local optimization of optical properties enables the system to maintain high resolution across the entire aperture.
2Illumination intensity
If the aperture is increased to achieve large aperture, then the F-number decreases, but the temperature resistance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1=10.5266mm, f2=15.301mm, f3=195.38mm, f4=-4.7mm, f5=15.32mm, f6=22.76mm), refractive powers, and surface curvatures. These optimized parameters ensure that the lens assembly maintains stable optical performance across temperature variations while achieving the desired large aperture with F-number of 2.0.
Solution Approach 2:
The lens assembly uses multiple lens elements made of different optical materials with varying refractive indices and thermal expansion properties. This composite structure allows compensation for temperature-induced changes in each element, maintaining overall optical performance and temperature resistance while achieving large aperture.
3Measurement precision
If the resolution is increased to achieve high resolution, then the manufacturing precision requirements increase, but the device complexity increases
Solution Approach 1:
The lens assembly is divided into six manageable lens elements with specific functions assigned to each. This segmentation allows high resolution to be achieved through coordinated optimization of individual elements rather than requiring extremely high precision in a single complex element. Each lens element can be manufactured and tested separately, reducing overall device complexity.
Solution Approach 2:
Each lens element is optimized for specific local functions: L1-L2 for light gathering, L3-L4 for spherical aberration correction, L5 for focal length control, and L6 for chromatic aberration correction. This localized optimization achieves high overall resolution while keeping each individual element relatively simple to manufacture.
4Measurement precision
If multiple lens elements are added to correct aberrations, then the chromatic aberration is improved, but the device complexity increases
Solution Approach 1:
The lens assembly is divided into six elements with specific elements (L4 and L6) dedicated to aberration correction. L4 with negative refractive power corrects spherical aberration, while L6 with positive refractive power and specific convex-concave configuration corrects chromatic aberration. This segmentation allows chromatic aberration correction to be achieved through specialized elements rather than requiring all elements to be complex.
Solution Approach 2:
Lens elements L4 and L6 are specifically designed with unique local optical properties for aberration correction. L4 has negative refractive power with concave-convex configuration, while L6 has positive refractive power with convex-concave configuration. These localized specializations achieve superior chromatic aberration correction while keeping other elements relatively simple.
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 effectively decreases the F-number, increases resolution, resists environmental temperature changes, corrects aberrations, and improves chromatic aberration, ensuring good optical performance.
Implementation Method 1
The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has positive refractive power
Data Source
AI summary
A lens assembly includes sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has positive refractive power and includes a convex surface facing the object side. The lens assembly satisfies the following condition: 0.2<|f5/f|<1.5; wherein f5 is an effective focal length of the fifth lens and f is an effective focal length of the lens assembly.