Five-Lens Optical Imaging System for Low-Light Vehicle Monitoring
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Solution Overview
Problem
Existing small monitoring cameras in vehicles struggle to clearly photograph objects in low-light environments, particularly at night, due to limited size and inability to effectively capture images in both visible and near-infrared light regions.
Innovation Solution
An optical imaging system comprising five lenses with specific refractive powers and surface curvatures, including a first lens with positive refractive power and concave object-side surface, a third lens with negative refractive power and concave surfaces, and a stop between the second and third lenses, designed to satisfy specific conditional expressions for focal length, field of view, and refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera size is reduced for vehicle mounting, then the device becomes more compact and easier to install, but the imaging performance in low-light environments deteriorates
Solution Approach 1:
The optical imaging system is divided into five distinct lens components with specific refractive powers and surface curvatures. This segmentation allows each lens to be optimized for specific functions (e.g., first lens with positive refractive power and concave object-side surface for light gathering, third lens with negative refractive power for aberration correction), achieving high imaging performance in a compact configuration that would be difficult with a single lens or fewer elements.
2Device complexity
If the camera is designed for daytime visible light photography, then the optical system can be simplified, but the ability to photograph objects in night environments deteriorates
Solution Approach 1:
The optical imaging system is designed with five lenses having specific refractive powers and surface curvatures that enable it to function effectively across multiple wavelengths including visible light and near-infrared regions. This universal design allows the same optical system to photograph objects in both daytime visible light conditions and nighttime low-light conditions without requiring separate optical paths or additional components, thereby achieving multi-environment adaptability while maintaining reasonable system 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 optical imaging system achieves high-resolution imaging in both visible and near-infrared light regions, even in low illumination environments, while being compact enough for use in vehicles, ensuring clear object photography at night and during the day.
Implementation Method 1
a first lens (110) having a positive refractive power, an object-side surface of which is concave
Data Source
AI summary
An optical imaging system includes a first lens having a positive refractive power and a concave object-side surface, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, and a fifth lens having a positive refractive power and a concave image-side surface. The first through fifth lenses are sequentially disposed in ascending numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system.