Eight-Lens Imaging Layout for Temperature-Stable Camera Resolution
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Solution Overview
Problem
Small surveillance cameras used in vehicles face challenges with resolution changes due to temperature fluctuations between -40°C and 80°C, which is problematic for autonomous driving applications requiring consistent optical performance.
Innovation Solution
An imaging lens system comprising multiple lenses with specific refractive powers and surface configurations, including convex and concave surfaces, designed to maintain optical performance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If early small surveillance cameras were designed to capture adjacent obstacles, then the device complexity was reduced, but the manufacturing precision and optical performance stability deteriorated due to high resolution changes with temperature
Solution Approach 1:
The patent applies parameter changes by carefully selecting and configuring multiple lens elements with specific refractive powers and dispersion characteristics. The lens system includes lenses with different Abbe numbers and refractive indices, arranged to compensate for thermal effects on optical performance, thereby maintaining stable resolution across temperature variations without increasing overall device complexity
Solution Approach 2:
The patent employs composite material principles by combining multiple lens materials with different thermal and optical properties. The lens system integrates elements made from materials with varying refractive indices and Abbe numbers, creating a composite optical system that counteracts thermal expansion and refractive index changes, thus maintaining optical precision under temperature fluctuations
2Manufacturing precision
If resolution was increased for autonomous driving applications, then the manufacturing precision improved, but the device complexity increased due to additional lens elements
Solution Approach 1:
The patent applies segmentation by dividing the optical system into multiple discrete lens elements, each with specific functions. The lens system is segmented into individual lenses with designated refractive powers and positions, allowing each element to be optimized for specific optical corrections while contributing to the overall high resolution and temperature stability
Solution Approach 2:
The patent implements multi-functionality by designing lens elements that simultaneously perform multiple optical functions. Each lens element not only contributes to the overall focusing power but also corrects specific aberrations and compensates for thermal effects, thereby achieving high resolution and temperature stability without proportionally increasing device complexity
3Manufacturing precision
If the lens system was designed for high resolution, then the manufacturing precision improved, but the reliability deteriorated due to sensitivity to temperature changes
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the lens system with elements designed to counteract anticipated thermal effects. The lens arrangement and material selection are optimized in advance to compensate for temperature-induced changes in refractive index and physical dimensions, thereby maintaining reliable optical performance across the expected temperature range
Solution Approach 2:
The patent utilizes parameter changes by selecting lens materials and configurations with specific thermal and optical parameters. The system incorporates lenses with carefully chosen refractive indices, Abbe numbers, and dispersion characteristics that change in a controlled manner with temperature, ensuring that optical performance remains consistent and reliable across varying thermal conditions
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 lens system maintains consistent optical performance and resolution across a wide temperature range, addressing the issue of resolution variability in surveillance cameras.
Implementation Method 1
the second lens has a positive refractive power
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, wherein the second lens has a positive refractive power, the third lens has a convex image-side surface in a paraxial region thereof, and the imaging lens system satisfies the conditional expression 0.3<f/f4<0.4, where f is a focal length of the imaging lens system, and f4 is a focal length of the fourth lens.