Seven-Lens Optical Imaging Layout for Lightweight High Resolution
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Solution Overview
Problem
Optical imaging systems for small terminals, such as unmanned aerial vehicles, face challenges in achieving high resolution while being lightweight, as glass-based systems are too heavy and plastic-based systems have lower resolution.
Innovation Solution
A seven-lens optical imaging system with specific refractive powers and configurations, including a movable second lens group, satisfies conditions such as TTL/2Y < 1.3 and −80 < {(1/f)*(Y/tan θ) − 1}*100 < −20, allowing for high resolution and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical imaging system is formed of glass to achieve high resolution, then the resolution level is improved, but the weight increases significantly
Solution Approach 1:
The patent changes the material parameter from glass to plastic, and modifies the lens configuration parameters (seven lenses with specific refractive powers and arrangements) to achieve high resolution while maintaining lightweight properties. The conditional expressions define specific parameter ranges for lens focal lengths, distances, and refractive powers that enable plastic lenses to achieve glass-level resolution.
2Weight of moving object
If an optical imaging system is formed of plastic to reduce weight, then the weight is reduced, but the resolution level decreases
Solution Approach 1:
The optical imaging system is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, and additional lenses) with specific configurations. This segmentation allows each lens to contribute to overall resolution while using lightweight plastic material, achieving high resolution through collective optical design rather than relying on single high-performance elements.
Solution Approach 2:
The patent employs a composite lens design where multiple plastic lenses with different refractive powers and optical properties are combined in a specific arrangement. This composite structure compensates for the individual limitations of plastic material, achieving high resolution equivalent to glass systems while maintaining the weight advantages of plastic.
3Area of stationary object
If the field of view is increased to monitor wide regions, then the coverage area is improved, but the optical system size increases
Solution Approach 1:
The patent introduces a movable second lens group that can shift along the optical axis to adjust focus and field of view. This dynamic configuration allows the system to maintain a compact form factor while providing variable field of view and focus adjustment capabilities, enabling wide region monitoring without proportionally increasing system size.
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 system achieves high resolution and miniaturization, suitable for small terminals with a wide field of view, balancing weight and performance.
Implementation Method 1
The first to seventh lenses are sequentially disposed from an object side toward an imaging plane. The first lens may have a negative refractive power. The second lens may have a positive refractive power.
Data Source
AI summary
An optical imaging system includes a first lens group and a second lens group. The first lens group includes a first lens and a second lens. The second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first to seventh lenses are sequentially disposed from an object side toward an imaging plane. The optical imaging system satisfies TTL/2Y<1.3, where TTL is a distance from an object-side surface of the first lens to the imaging plane, and 2Y is a diagonal length of the imaging plane.