Seven-Lens Optical Layout for Temperature-Stable High-Resolution Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Small-sized surveillance cameras face challenges in maintaining high pixel density and constant optical characteristics under severe temperature variations, particularly between −40°C to 80°C, which is essential for advanced vehicle surveillance systems.
Innovation Solution
An optical imaging system comprising seven lenses, including plastic and glass materials, with specific refractive powers and surface configurations, along with a stop and filter, to maintain consistent performance across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small-sized surveillance camera is designed with high pixel density (12 megapixels or higher), then resolution is improved, but maintaining constant optical characteristics under severe temperature variations (−40°C to 80°C) becomes difficult
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the refractive indices and Abbe numbers of lens materials, along with optimizing curvature radii and thickness parameters. The conditional expressions define specific parameter ranges (e.g., 1.0 < f/f2 < 1.5, 0.5 < vD2 − vD3 < 2.0) that ensure the optical system maintains stable characteristics across temperature variations while achieving high resolution
Solution Approach 2:
The patent uses composite materials by combining multiple lens elements with different material properties (different refractive indices and Abbe numbers). The optical system integrates at least three lenses made of different materials, including plastic and glass components, to achieve both high resolution and temperature stability through material diversity
2Reliability
If the optical system uses multiple lenses with different materials to maintain temperature stability, then optical characteristic stability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the optical system to simultaneously achieve multiple functions: high resolution imaging, temperature compensation, and aberration correction. The lens combination with specific refractive powers and material properties enables the system to perform all these functions within a single integrated structure, reducing the need for additional separate components
3Measurement precision
If the camera is designed for high pixel density and wide field of view, then imaging capability is improved, but sensitivity to temperature changes increases
Solution Approach 1:
The patent converts the harmful effect of temperature changes into a beneficial design constraint. By analyzing how different materials respond to temperature variations, the patent selects lens materials and configurations whose thermal expansion and refractive index changes compensate for each other. The conditional expressions on refractive index differences and Abbe number combinations ensure that temperature-induced variations are transformed into a self-correcting system
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 wide field of view with consistent optical performance across varying temperatures, suitable for surveillance cameras in vehicles and drones.
Implementation Method 1
An optical imaging system includes a first lens having a negative refractive power; a second lens having a refractive power
Data Source
AI summary
An optical imaging system includes a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power. At least five of the lenses are made of a plastic material.