With the optimization and upgrading of automotive lens technology, the shock resistance, wear resistance, high temperature and low temperature resistance of automotive lenses have been gradually improved, and the picture quality has become clearer.
In order to control the ghosting and stray light caused by frontal glare interference such as headlights, maintain the stability of optical imaging and effectively capture and distinguish object details under extreme temperatures or short-term rapid temperature changes, in addition to improving the algorithm from the software, automotive lens manufacturers are also actively promoting the overall technological progress of automotive lens products by improving the coating process, improving technical parameters, and adding conductive heating films outside the vehicle Lens.
The core of car lens perception is vision, and resolution determines the level of vision. With the increasing demand for sensing distance by ADAS functions, more refined and higher-resolution automotive lenses in terms of sensing content are the general trend.
For mainstream new energy car companies, 120W to 200W lenses are no longer sufficient, and the industry has begun to upgrade to 800W pixels. At present, there are relatively few manufacturers with the production capacity of 800W pixel lens modules.
Automotive lenses require high durability and thermal stability. According to the material, the lens of the car lens can be made of glass and plastic. The optical glass lens has high durability, scratch resistance, and good temperature performance, so it is mostly used in high-end product. The plastic lens is cheap but the imaging effect is poor, and it is easy to cause deformation of the lens in the harsh use environment of the car, which affects the imaging quality.
At present, considering cost and performance, mainstream manufacturers of automotive lenses are gradually starting to use glass-plastic hybrid lenses, and some high-end lenses use full-glass solutions.
The performance comparison of plastic and glass lenses is as follows:
(1) Plastic lens:
Advantages: light weight, low cost, low process difficulty, suitable for mass production;
Disadvantages: slightly lower light transmittance, poor heat resistance, large thermal expansion coefficient, poor wear resistance, low mechanical strength, etc.
(2) Glass lens:
Advantages: excellent performance, high light transmittance;
Disadvantages: mainly due to the difficulty of mass production, low yield and high cost.
Spherical lenses can cause aberration problems, that is, the light entering from the center of the lens does not have the same focus as the light entering the edge of the lens, resulting in blurred images. Spherical lenses require a combination of multiple lenses to reduce aberrations.
The aspherical lens is a lens composed of a spherical surface and a curved surface other than a plane. By changing the curvature of the lens, the light is concentrated at a fixed focus, which solves the problem of aberration, and can be achieved with only one lens. Therefore, aspherical lenses have the advantages of miniaturization, light weight and good imaging effect, and have become the best solution for high-pixel automotive lenses.
Plastic aspherical lenses are produced by injection molding, while glass aspherical lenses are produced from high-quality optical glass using precision-controlled hot-molding technology.
The car lens relies on light transmission to identify road information, and the dirt on the lens surface will lead to a decrease in the recognition ability, and it is difficult to reduce the dirt from an optical point of view. In addition, whenever it encounters rain and snow, the lens exposed outside the car will even suffer from fogging and frosting.
Self-cleaning and anti-fouling: At present, mainstream manufacturers will at least coat a hydrophobic coating on the surface of the lens of the car lens. On the one hand, it can effectively remove dirt by means of water spray cleaning.
Anti-fog and defrosting: There are currently two directions in the industry. One is through coating. The outer surface of the lens is coated with a hydrophobic film. The inner surface of the lens is coated with a hydrophilic film; the second is to use a heating scheme, or to heat the lens as a whole, or to make a transparent conductive film on the surface of the lens to achieve heating.
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