Anti-reflection film is also called anti-reflection film. Its main function is to reduce or eliminate the reflected light from optical surfaces such as lenses, prisms, and plane mirrors, thereby increasing the light transmittance of these components and reducing or eliminating the stray light of the system.
The high wear-resistant double-layer anti-reflection film for near-infrared automotive laser radar is an optical film used in automotive laser radars that can reduce the reflection of near-infrared light and has high wear resistance. It plays an important role in improving the optical performance and durability of laser radars. The anti-reflection film is based on the wave and interference phenomena of light. When light is incident on the surface of the film, it will be reflected on the upper and lower surfaces of the film respectively. If the optical thickness of the film layer is one-fourth of a certain wavelength, the optical path difference between the two adjacent reflected light beams is exactly π, that is, the vibration direction is opposite, and the superposition will reduce the reflected light of the optical surface to the wavelength. By reasonably designing the refractive index and thickness of the double-layer film, the near-infrared light can achieve a better anti-reflection effect in a wider spectral range and reduce the loss during light transmission.
Ultrasonic spraying technology has the advantages of good coating uniformity and strong thickness controllability in the preparation of highly wear-resistant double-layer anti-reflection films. It is especially suitable for scenarios such as automotive laser radars that require high optical performance and mechanical strength.
Core advantages:
● Atomization uniformity: Ultrasonic spraying allows the solution to form precise atomization, avoiding the droplet agglomeration problem of traditional spraying, and the coating thickness deviation can be controlled within ±5%.
● Low impact deposition: The droplet kinetic energy is low, and a damage-free coating can be formed on the substrate (such as optical glass and plastic), which is suitable for complex curved surfaces (such as the curved surface of the laser radar lens).
● Precise quantity control: By adjusting parameters such as ultrasonic power and solution flow, the coating thickness (nanoscale to microscale) can be precisely controlled.
Process advantages of ultrasonic spraying
1. Optical performance advantages: low scattering loss, high density of ultrasonic spray coating, suitable for high-power light transmission of lidar.
2. Improved wear resistance: adhesion between coating and glass substrate, fine and high uniformity of ultrasonic spray droplets, reducing interface stress concentration.
3. Mass production adaptability: can be integrated into a continuous production line, and batch spraying of large-area substrates (such as lidar lens arrays) can be achieved through a multi-nozzle array. High material utilization, the material utilization rate of ultrasonic atomization is > 90% (conventional spraying is only 50~60%), reducing production costs, especially suitable for the application of precious metal oxides (such as TiO₂).
