Optical lens coating，Mainly divided into three layers，They are wear-resistant coating layers、Anti reflective coating layer、Anti pollution coating layer，These three coating layers，It will make the vision brighter，Even in dim environments, there will be no gray haze，It can also effectively alleviate visual fatigue in the eyes。Principle of Optical Lens Coating: Wear resistant Coating Layer：Located in the inner layer of the lens，Can effectively prevent lens wear and tear、Scratch off。Utilizing anti-wear film technology，Various process conditions are applied to the surface of the lens，Form a very hard wear-resistant film layer，Make the lens less susceptible to external impacts，Rupture occurs、Scratches and other phenomena。Anti reflective coating layer：The fluctuation of light and

The basic principle of magnetron sputtering is to change the direction of electron motion with a magnetic field，Restricting and prolonging the motion path of electrons，Improved the ionization probability of electrons and effectively utilized their energy。therefore，In the formation of high-density plasma glow discharge，The sputtering of the target material caused by positive ion bombardment is more effective，Electrons bound by orthogonal electromagnetic fields can only deposit on the substrate when their energy is about to be depleted。This is what magnetron sputtering has“low temperature”、“high speed”The mechanism of two major characteristics。The main advantages of magnetron sputtering are as follows：（1）Various materials used to prepare target materials can be used as thin film materials，Including various metals、

ITOConductive glass is based on sodium calcium or silicon boron substrate glass，Utilizing sputtering、Coating a layer of indium tin oxide using various methods such as evaporation（be commonly calledITO）Made by membrane processing。Dedicated for LCD displaysITOConductive glass，It will also be platedITOBefore the layer，Plating a layer of silicon dioxide barrier layer，To prevent sodium ions on the substrate glass from diffusing into the liquid crystal inside the cell。Dedicated for high-end LCD displaysITOGlass is splatteredITOBefore the layer, the substrate glass needs to be polished，To achieve more uniform display control。Dedicated for LCD displaysITOGlass substrates are generally super float glass，All coated surfaces are made of glass

Principle of lens coating Why do lenses and lenses need coating？This is because any object has a reflection effect on light，Even colorless and transparent glass is no exception，The difference lies in whether the angle of the light will create a reflection effect。For ideal lenses，Light can completely pass through the lens，And correctly on the film or CCD Fully focused on。however，In fact, it is，Each type of lens is limited by its own physical factors，Causing the generation of aberrations（See previous lecture for details），therefore，There are many『problem』The lens formed by the combination of lenses cannot theoretically allow all kinds of angles of light to pass through completely

Coated glass（Reflective glass）Also known as reflective glass。Coated glass is a type of glass that is coated with one or more layers of metal on its surface、Alloy or metal compound thin film，To change the optical properties of glass，Meet a specific requirement。Coated glass according to different characteristics of the product，It can be divided into the following categories：Heat reflective glass、Low radiation glass（Low-E）、Conductive film glass, etc。Heat reflective glass is generally coated with one or more layers such as chromium on the surface of the glass、Thin films composed of metals such as titanium or stainless steel or their compounds，Make the product appear in rich colors，Appropriate transmittance for visible light，Has a high sensitivity to infrared radiation

at present，The commonly used method for producing vacuum collector tubes in China is still multi-layer aluminum-nitrogen/Manufacturing technology of aluminum solar selective absorption coating。This technology was developed by Professor Yin Zhiqiang and his colleagues at Tsinghua University1984Annual Invention，1985Annual application for national patents，1987Approved annually（Patent number：ZL851001424）。The basic principle of this technology is inside the coating machine，Setting up a magnetron sputtering system for a single cylindrical aluminum target。Loading dozens of glass tubes into the coating machine as inner tubes for heat collection tubes at once，stay“planet”Under the transmission of the mechanism，Glass tubes undergo revolution and rotation。Vertical cylindrical aluminum target at the center position，In argon gas