Six-Lens Optical Imaging System Thermal Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Small monitoring cameras used as sensors in vehicles face overheating issues due to high resolution requirements, necessitating an optical imaging system that maintains high resolution at elevated temperatures.
Innovation Solution
An optical imaging system comprising six lenses with specific refractive powers and surface curvatures, including cemented lenses and aspherical surfaces, designed to maintain resolution across a range of temperatures, with a stop and filter configuration to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution is implemented in the monitoring camera, then sensing precision is improved, but temperature stability deteriorates due to overheating
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the refractive powers, curvatures, and spacing of six lens elements to create an optical system that maintains resolution stability across temperature variations. The specific configuration with alternating positive and negative power lenses creates thermal compensation effects that counteract temperature-induced focal length changes.
Solution Approach 2:
The patent uses composite lens structures including cemented lens combinations (positive-negative lens pairs bonded together) and aspherical surface elements. These composite structures allow for thermal expansion compensation and maintain optical performance across temperature ranges from -30°C to 85°C, resolving the contradiction between high resolution and temperature stability.
2Manufacturing precision
If resolution is maintained at high temperature, then image quality is improved, but device complexity increases due to multiple lens elements
Solution Approach 1:
The patent merges lens elements into cemented lens combinations where positive and negative power lenses are bonded together. This merging approach achieves two goals: it maintains high resolution across temperatures while reducing the overall number of air-glass interfaces, thereby simplifying the system compared to using separate adjustable elements for thermal compensation.
Solution Approach 2:
The patent incorporates aspherical surfaces on specific lens elements to correct spherical aberration and maintain image quality across the field of view and temperature range. The aspherical profiles are optimized to compensate for thermal effects without requiring additional lens elements, thus maintaining image quality while controlling device complexity.
3Measurement precision
If multiple lens elements are used, then resolution is improved, but focal length stability deteriorates with temperature changes
Solution Approach 1:
The patent uses parameter changes by optimizing the refractive indices, dispersion properties, and geometric parameters of six lens elements. The specific configuration creates a thermal focal length compensation effect where the combined optical power remains stable across temperature changes, resolving the contradiction between achieving high resolution and maintaining focal length stability.
Solution Approach 2:
The patent designs the six-lens optical system to serve multiple functions simultaneously: it achieves high resolution imaging, compensates for thermal focal length changes, and maintains a compact form factor. The cemented lens combinations and aspherical surfaces provide multi-functional performance without requiring additional separate systems.
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 a constant high level of resolution from 10°C to 60°C, reducing temperature-dependent focal length changes and maintaining image quality in varying environmental conditions.
Implementation Method 1
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 positive refractive power
Implementation Method 2
two lenses that are adjacent to each other among the first to sixth lenses are cemented to each other to form a cemented lens
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative refractive power. The second lens has a negative refractive power. The third lens has a positive refractive power. The fourth lens has a positive refractive and an object-side surface that is concave in a paraxial region thereof. The fifth lens has a positive refractive power. The sixth lens has a negative refractive power. The first to sixth 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. Two lenses that are adjacent to each other among the first to sixth lenses are cemented to each other to form a cemented lens.