Seven-Lens Optical Assembly for Compact High-Resolution Imaging
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Solution Overview
Problem
Current lens assemblies fail to simultaneously achieve miniaturization, high resolution, and resistance to environmental temperature changes while maintaining good optical performance.
Innovation Solution
A lens assembly comprising multiple lenses with specific refractive powers and surface configurations, arranged along an optical axis with air gaps, satisfying certain focal length and curvature conditions to optimize field of view, resolution, and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the device size is reduced, but the resolution and optical performance deteriorate
Solution Approach 1:
The lens assembly is divided into seven individual lens elements (first lens through seventh lens) with different refractive powers and surface configurations. Each lens element contributes differently to the overall optical performance, allowing the system to achieve high resolution while maintaining a compact total length of 12.5mm. The segmentation enables complex optical corrections to be distributed across multiple elements rather than requiring a single large lens.
Solution Approach 2:
Different lens elements have different local optical properties - some have positive refractive power, others have negative refractive power. The first lens has negative refractive power with specific curvature ratios, while the fourth and seventh lenses have positive refractive power. This local differentiation of optical properties allows the compact assembly to correct various aberrations and achieve high resolution despite the miniaturized scale.
2Device complexity
If the lens assembly structure is simplified to reduce complexity, then the manufacturing cost is reduced, but the resistance to environmental temperature change deteriorates
Solution Approach 1:
The lens assembly incorporates specific parameter relationships to achieve temperature resistance. The curvature radius ratios (such as -1.5 < R21/R22 < -0.5 for the second lens) and focal length relationships (such as 0.5 < f2/f6 < 2.0) are carefully controlled to compensate for thermal expansion and refractive index changes. These parameter optimizations allow the lens to maintain optical performance across temperature variations without requiring complex active compensation mechanisms.
3Measurement precision
If multiple lenses with specific configurations are added to improve resolution, then the resolution and optical performance are enhanced, but the total lens length and device complexity increase
Solution Approach 1:
The seven lens elements are arranged in a nested configuration along the optical axis with minimal spacing between elements. The air gaps between adjacent lenses are optimized to be as small as possible while maintaining optical performance. This nesting approach allows multiple lens elements with different functions to be packed into a compact total length of 12.5mm, achieving high resolution without proportionally increasing the overall device size.
4Reliability
If multiple lenses with specific configurations are added to correct aberrations, then the optical performance is enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The lens assembly employs asymmetric surface configurations rather than uniform symmetric designs. The first lens has a specific asymmetry with -2.0 < R11/R12 < -0.5, and other lenses have varying surface curvatures tailored to their specific optical functions. This asymmetric design allows each lens element to be optimized for its particular role in correcting specific types of aberrations, achieving superior optical performance while keeping the overall structure manageable through functional specialization rather than uniform complexity.
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 effectively shortens the total lens length, increases the field of view, enhances resolution, resists environmental temperature changes, and corrects aberrations and chromatic aberrations, ensuring good optical performance.
Implementation Method 1
The first lens is with negative refractive power. The second lens is with refractive power. The third lens is with refractive power. The fourth lens is with positive refractive power... The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical the axis.
Data Source
AI summary
A lens assembly includes a first, a second, a third, a fourth, a fifth, a sixth, and a seventh lenses. The first lens has negative refractive power. The second, third, fifth, and sixth lenses have refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The sixth includes a concave surface facing an object side. The seventh lens has positive refractive power. The lens assembly satisfies at least one of the following conditions: −4<f2/f6<7; 0.7<f3/f7<1.1; −3<f123/f4567<2; wherein f2, f3, f6, and f7 are respectively effective focal lengths of the second, third, sixth, and seventh lenses, f123 is an effective focal length of a combination of the first, second, and third lenses, and f4567 is an effective focal length of a combination of the fourth, fifth, sixth, and seventh lenses.