Optical Imaging Lens for Vehicle ADAS with Temperature Stability
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Solution Overview
Problem
Conventional vehicle lenses for automatic driving assistance systems face challenges in maintaining imaging clarity under varying temperature conditions and fail to meet high requirements for imaging quality and aberration correction.
Innovation Solution
An optical imaging lens design comprising a first group with negative focal power, a stop, and a second group with positive focal power, including a cemented body formed by the fourth and fifth lenses, which are both convex and concave surfaces respectively, to provide a large field of view, reduce total lens length, and correct chromatic aberration, while using glass spherical lenses to enhance temperature stability and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vehicle lens design is used, then the lens can be manufactured with standard structures, but the imaging clarity deteriorates under high or low temperature conditions
Solution Approach 1:
The patent applies parameter changes by carefully selecting specific refractive indices and Abbe numbers for each lens element that are optimized for temperature stability. The first lens has refractive index 1.516-1.522 and Abbe number 64.0-68.0, the second lens has refractive index 1.634-1.667 and Abbe number 25.0-28.0, and subsequent lenses have specifically matched parameters. This parameter optimization ensures minimal thermal expansion and refractive index changes across the operating temperature range, maintaining imaging clarity from -40°C to +105°C
Solution Approach 2:
The patent uses composite material principles by combining multiple lens elements with different optical properties (different refractive indices and Abbe numbers) to create a lens system that compensates for temperature effects. The cemented body formed by the fourth and fifth lenses combines materials with complementary thermal and optical characteristics, creating a composite structure that maintains optical performance across varying temperatures
2Manufacturing precision
If a six-lens design with cemented body is used, then aberration correction and imaging quality are improved, but the lens manufacturing complexity increases
Solution Approach 1:
The patent applies merging by combining the fourth and fifth lenses into a single cemented body. This reduces the number of separate air-glass interfaces from 10 to 8, simplifying alignment and reducing manufacturing complexity. The cemented body is designed with positive focal power, integrating two lens elements with different optical properties into a unified component that corrects chromatic and spherical aberrations more effectively than separate elements
3Area of stationary object
If the first group with negative focal power is used, then the field of view is enlarged, but the total lens length increases
Solution Approach 1:
The patent applies segmentation by dividing the lens system into two functional groups: a first group with negative focal power (first and second lenses) that expands the field of view, and a second group with positive focal power (third through sixth lenses) that focuses light and shortens the effective optical path. The stop positioned between these groups further segments the optical path, allowing each segment to be optimized for its specific function while maintaining overall compactness
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 optical imaging lens achieves improved imaging quality, reduced aberration, and stability across a wide temperature range (-40°C to +105°C), with a compact design and effective temperature control, ensuring clear images in both bright and dark environments.
Implementation Method 1
The first group has a negative focal power, and sequentially includes a first lens and a second lens from the object side to an image plane. The first lens has a negative focal power, an object side surface and an image side surface of the first lens are both concave surfaces. The second lens has a positive focal power
Implementation Method 2
The fourth lens and the fifth lens form a cemented body with a positive focal power. The cemented body formed by the fourth lens and the fifth lens can reduce the lens aberration
Data Source
Figure 1
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AI summary
Provided are an optical imaging lens (100) and an imaging device, the optical imaging lens (100) sequentially from an object side to an image plane (S15) along the optical axis comprises: a first group (Q1), a diaphragm (ST), and a second group (Q2), wherein, the first group (Q1) has a negative optical power, the first group (Q1) sequentially comprises a biconcave first lens (L1) having a negative optical power and a biconvex second lens (L2) having a positive optical power from the object side to the image plane (S15); the second group (Q2) has a positive optical power, the second group (Q2) sequentially comprises a third lens (L3) having a positive optical power with the object side surface (S5) being convex and the image side surface (S6) being concave, a biconcave fourth lens (L4) having a negative optical power, a biconvex fifth lens (L5) having a positive optical power, and a sixth lens (L6) having a positive optical power with the object side surface (S10) being convex and the image side surface (S11) being concave from the object side to the image plane (S15), wherein, the fourth lens (L4) and the fifth lens (L5) form a bonded body having a positive optical power; the diaphragm (ST) is disposed between the first group (Q1) and the second group (Q2). The optical imaging lens (100) and imaging device can provide good imaging quality.