Five-Lens Camera Optics for Temperature-Stable Vehicle Imaging
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Solution Overview
Problem
Existing optical systems for vehicle cameras, particularly those used in ADAS and DMS, face challenges in maintaining consistent optical characteristics across varying temperature ranges, such as high and low temperatures, leading to aberrations and performance degradation.
Innovation Solution
An optical system comprising multiple lenses with specific power configurations, including negative and positive composite powers, optimized effective diameters, and strategic placement of an aperture stop, along with the use of glass and aspherical lenses, to minimize temperature-induced changes in optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lenses are used to achieve high-definition and high-resolution imaging, then imaging quality is improved, but optical characteristics change in harsh environments
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices, Abbe numbers, focal lengths, and spacing of each lens in the optical system. By adjusting these parameters, the system achieves high-definition imaging while maintaining stability across temperature ranges from -20°C to 105°C, resolving the contradiction between imaging quality and environmental reliability
Solution Approach 2:
The patent uses composite material principles by combining multiple lens materials with different optical properties (different refractive indices and Abbe numbers) into a unified optical system. This composite approach allows the system to leverage the strengths of each material to achieve both high resolution and temperature stability, preventing characteristic changes in harsh environments
2Measurement precision
If lens power and diameter are optimized for imaging performance, then resolution is improved, but temperature-induced focal length changes cause aberrations
Solution Approach 1:
The patent applies preliminary anti-action by designing the optical system with pre-calculated lens configurations that counteract expected temperature-induced focal length changes. The lens powers and spacing are optimized in advance to compensate for thermal expansion and refractive index changes, preventing aberrations before they occur across the -20°C to 105°C operating range
Solution Approach 2:
The patent applies local quality by assigning different optical properties to different lenses within the system. Each lens has specifically tailored refractive index, Abbe number, and curvature characteristics that address local optical requirements while collectively maintaining overall system stability and resolution across varying temperatures
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 maintains improved optical performance across a wide temperature range (−20°C to 105°C) by compensating for focal length changes due to temperature variations, ensuring minimal aberrations and enhanced MTF characteristics.
Implementation Method 1
first to fifth lenses sequentially disposed from an object side
Data Source
AI summary
The optical system disclosed in the embodiment first to fifth lenses sequentially disposed from an object side, wherein a composite power of the first lens and the second lens are negative, a composite power of the third to fifth lenses are positive, an effective diameter of the second lens among the first to fifth lenses is the smallest, an effective diameter of the first lens is larger than the effective diameter of the second lens and smaller than the effective diameters of the third to fifth lenses, and a power of the third lens among the first to fifth lenses is the largest, and a power of the fourth lens among the first to fifth lenses is the second largest.