Vehicle Camera Lens Group Thermal Stability Design
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Solution Overview
Problem
Existing vehicle lenses are sensitive to temperature changes, suffer from low resolution, and chromatic aberration, making them unsuitable for high and low temperature environments and impractical for autonomous driving applications.
Innovation Solution
An optical imaging lens group comprising specific glass lenses with negative and positive refractive powers, including a doublet lens configuration and special glass materials, to minimize focus shift and correct aberrations, ensuring thermal stability and high resolution across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lenses are used in vehicle cameras, then the device complexity is low, but the thermal stability deteriorates due to sensitivity to temperature changes
Solution Approach 1:
The lens group is divided into multiple individual lens elements (first lens, second lens, third lens, fourth lens, fifth lens, sixth lens) with different refractive powers and material properties. Each lens element can be independently designed and optimized, allowing the system to achieve thermal stability through the combined effect of multiple segments rather than relying on a single complex lens.
Solution Approach 2:
The patent employs composite lens design by combining lenses made of different glass materials with varying refractive indices and thermal expansion coefficients. Specifically, the fourth lens and sixth lens use glass materials with negative refractive index coefficients, while other lenses use conventional glass materials, creating a composite optical system that compensates for thermal effects.
2Manufacturing precision
If conventional lenses are used, then the manufacturing cost is low, but the image quality deteriorates due to low resolution and chromatic aberration
Solution Approach 1:
The optical system is segmented into six distinct lens elements, each with specific refractive powers (positive or negative) and surface curvatures. This segmentation allows each element to be optimized for specific functions: the first lens for light collection, the second lens for distortion correction, the third/fourth/sixth lenses for light convergence, and the fourth-fifth lens combination for chromatic aberration elimination.
Solution Approach 2:
The patent uses composite glass materials with different optical properties to correct chromatic aberration. The fourth lens and fifth lens form a doublet with complementary dispersion characteristics, while the sixth lens uses special glass with negative refractive index coefficient to further eliminate residual chromatic aberration and control ray angles.
3Adaptability or versatility
If lenses with simple structure are used, then the ease of manufacture is high, but the adaptability deteriorates in high and low temperature environments
Solution Approach 1:
The patent changes the optical parameters of the lens system by incorporating elements with negative refractive index coefficients (fourth lens and sixth lens) alongside conventional positive coefficient elements. This parameter variation allows the system to compensate for thermal expansion and refractive index changes across different temperature conditions, achieving environmental adaptability.
Solution Approach 2:
The patent converts the harmful effect of temperature-induced focus shift into a beneficial compensation mechanism. By combining lenses with positive and negative refractive index coefficients, the system exploits the opposite focus shift directions to cancel out thermal effects, turning temperature sensitivity into thermal stability.
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 group provides improved thermal stability, reduced chromatic aberration, and enhanced image quality, enabling effective image capture in diverse environmental conditions, including high and low temperatures, with increased pixel density and aperture size.
Implementation Method 1
the fourth lens and the fifth lens are used for eliminating chromatic aberration as a positive and negative lenses
Implementation Method 2
Each of the lenses being glass lens makes the optical imaging lens group have good thermal stability. In addition, a focus shift occurs due to changes of the temperature, the lens having a negative refractive power and the lens having a positive refractive power have opposite focus shift direction as the temperature changes
Implementation Method 3
the first lens of the optical imaging lens group of the present disclosure is mainly used for collecting light
Implementation Method 4
the second lens is mainly used for correcting optical distortion
Implementation Method 5
the third lens, the fourth lens, the fifth lens and the sixth lens are mainly for converging light
Implementation Method 6
the sixth lens are used for eliminating aberrations and controlling exit angle of main rays
Data Source
AI summary
An optical imaging lens group, from an object side to an image side sequentially includes: a meniscus-shaped first lens having a negative refractive power and a convex surface facing the object side; a meniscus-shaped second lens having a negative refractive power and a convex surface facing the image side; an aperture stop; a third lens having a positive refractive power and two convex surfaces respectively at the object side and the image side; a fourth lens having a positive refractive power and two convex surfaces respectively at the object side and the image side; a fifth lens having a negative refractive power and two concave surfaces respectively at the object side and the image side; a sixth lens having a positive refractive power and two convex surfaces respectively at the object side and the image side; and a filter.