Optical Imaging Lens Layout for High-Resolution Thermal Stability
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Solution Overview
Problem
Existing vehicle-mounted camera lenses fail to meet the requirements of ultra-high resolution, large imaging surface, and thermal stability necessary for advanced driver assistance systems (ADAS) in varying outdoor environments.
Innovation Solution
An optical imaging lens configuration comprising specific glass spherical and aspherical lenses with optimized focal powers and arrangements, satisfying conditions such as TTL/ImgH < 8, R6/R5 < −2.8, and other curvature and Abbe number ratios, to enhance image resolution and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lens designs are used, then the lens structure is simple, but the image resolution and thermal stability are insufficient for ADAS requirements
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with L1-L3, second lens group with L4-L7) with different functions. The first group handles broad optical functions while the second group specifically corrects aberrations and improves resolution. This segmentation allows each group to be optimized for its specific function, achieving ultra-high resolution without requiring a completely complex monolithic design.
Solution Approach 2:
The patent employs a combination of spherical and aspherical surfaces across different lenses. Specifically, L4 has an aspherical object-side surface, L5 has an aspherical image-side surface, and L6 has an aspherical object-side surface. This strategic use of aspherical surfaces corrects spherical aberration and improves image resolution at the edges, while maintaining manufacturing feasibility by not requiring all surfaces to be aspherical.
2Stability of the object's composition
If conventional lens designs are used, then manufacturing is easier, but thermal stability in high- and low-temperature environments is poor
Solution Approach 1:
The patent specifies precise parameter ranges for thermal stability: the ratio of focal lengths f1/f2 is constrained to -3.0 to -1.5, and the Abbe number ratio Vd1/Vd2 is constrained to 0.8 to 1.2. These parameter constraints ensure that the lens maintains its optical properties across temperature variations by balancing the thermal expansion and refractive index changes of different glass materials used in the lens groups.
Solution Approach 2:
The patent uses composite glass materials with different thermal and optical properties in the lens groups. The first lens group uses glass materials with specific Abbe numbers (Vd1) and refractive indices (Nd1), while the second lens group uses glass materials with different properties (Vd2, Nd2). This composite material approach allows compensation for thermal effects through the differential properties of the glass materials, maintaining thermal stability in harsh environments.
3Area of stationary object
If the imaging surface is enlarged to capture more scene, then the field of view improves, but the lens length and complexity increase
Solution Approach 1:
The patent achieves a large imaging surface with controlled lens length through dynamic optical design. The conditional formula TTL/ImgH < 8 establishes a dynamic relationship between total lens length (TTL) and image height (ImgH), allowing the lens to scale its effective imaging area while maintaining a compact form factor. The multi-group configuration with specific focal length ratios enables this dynamic scaling without linearly increasing overall lens length.
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 achieves ultra-high image resolution, good thermal stability, and ease of assembly, making it suitable for harsh environments and improving the performance of ADAS systems.
Implementation Method 1
the first lens has negative focal power, an object side surface thereof being a convex surface and an image side surface thereof being a concave surface; the second lens has negative focal power, an object side surface thereof being a concave surface and an image side surface thereof being a convex surface
Data Source
AI summary
The invention discloses an optical imaging lens and imaging equipment. The optical imaging lens sequentially comprises, from an object side to an imaging surface along an optical axis, a first lens having negative focal power and with the object side surface to be a convex surface and the image side surface to be a concave surface, a second lens having negative focal power and with the object side surface to be a concave surface and the image side surface to be a convex surface, a third lens having positive focal power and with both the object side surface and the image side surface to be convex surfaces, a diaphragm, a fourth lens having positive focal power and with both the object side surface and the image side surface to be convex surfaces, a fifth lens having positive focal power and with both the object side surface and the image side surface to be convex surfaces, a sixth lens having negative focal power and with both the object side surface and the image side surface to be concave surfaces, and forming a cemented lens group with the fifth lens, and a seventh lens having positive focal power and with both the object side surface and the image side surface to be convex surfaces. The optical imaging lens provided by the invention has the characteristics of ultrahigh resolution, good thermal stability, large imaging surface and convenience in assembly.