Optical Imaging System Lens Configuration for Vehicle Monitoring
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Solution Overview
Problem
Small monitoring cameras used in vehicles face a trade-off between high resolution for sensing fine movements and increased internal temperature due to bright optical systems, which can decrease resolution over time.
Innovation Solution
An optical imaging system comprising a sequence of lenses with specific refractive powers and configurations, including a stop to adjust light incidence, which balances refractive power distribution to maintain high resolution while managing temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bright optical system is used to increase resolution, then the resolution of the monitoring camera is improved, but the internal temperature of the monitoring camera increases
Solution Approach 1:
The optical system is divided into multiple lens groups (first through eighth lenses) with alternating positive and negative refractive powers. This segmentation allows distribution of the optical burden across multiple elements, reducing heat generation in any single lens while maintaining overall system brightness and resolution.
Solution Approach 2:
Different lens elements are assigned specific refractive powers (positive or negative) based on their position in the optical path. This local optimization of optical properties allows each lens to contribute efficiently to image quality while managing thermal characteristics through strategic placement of high and low refractive power elements.
2Illumination intensity
If the internal temperature increases, then the brightness of the optical system is improved, but the resolution decreases
Solution Approach 1:
The optical system incorporates a stop that can be positioned at different locations between lenses to dynamically control the amount of light passing through the system. This dynamic adjustment allows optimization of brightness while preventing excessive heat accumulation that would degrade resolution, adapting to different operating conditions.
Solution Approach 2:
The system changes the parameter of light transmission by using a stop to control aperture size and position. By adjusting this parameter, the system can reduce light intensity when high brightness would cause overheating, thereby maintaining resolution while still providing sufficient illumination for imaging.
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 a wide field of view, suitable for vehicle monitoring cameras, with a compact design that maintains performance even in high-temperature environments.
Implementation Method 1
a first lens having refractive power; a second lens having refractive power; a third lens having refractive power and cemented to the second lens
Data Source
AI summary
An optical imaging system includes a first lens having refractive power; a second lens having refractive power; a third lens having refractive power and cemented to the second lens; a fourth lens having refractive power; a fifth lens having refractive power and cemented to the fourth lens; a sixth lens having refractive power; a seventh lens having refractive power; and an eighth lens having refractive power. The first to eighth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of the optical imaging system toward an imaging plane of the optical imaging system.