In the process of preparing flat mirrors, there is often a procedure called optical coating，Lenses are generally divided into two types，Lenses made of inorganic and organic materials，And in daily life use，Any lack of attention to detail can cause lens wear and tear，Make scratches on the surface of the mirror plate，Scratches can be roughly divided into two types，A shallow and small，The other type is deep and rough，Regardless of which type it is，Long term wearing can have a significant impact on vision。in recent years，The development of optical coating technology is becoming increasingly rapid，Below are several generationsPrinciple of Optical Coatinganalysis：

　　1)The principle of the first generation optical coating

　　Anti wear film begins with20century70At the beginning of the year，At that time, it was believed that glass lenses were difficult to grind because of their high hardness，Organic lenses are too soft and therefore prone to wear and tear。Therefore, quartz material is deposited on the surface of organic lenses under vacuum conditions，Form a very hard anti-wear film，However, due to the mismatch between its thermal expansion coefficient and the substrate material，Easy to peel off and cause brittle cracking of the film layer，Therefore, the anti-wear effect is not ideal。

　　2)Principle of second-generation optical coating

　　20century80年代以后，Researchers have theoretically discovered that the mechanism of wear is not only related to hardness，The membrane material has“hardness/deformation”The dual characteristics，Some materials have higher hardness，But the deformation is relatively small，And some materials have lower hardness，But the deformation is significant。The second generation of anti-wear film technology is to coat the surface of organic lenses with a high hardness and non brittle material through immersion process。

　　3)The principle of third-generation optical coating

　　The third-generation anti-wear film technology is20century90Developed after the era，Mainly to solve the wear resistance problem of organic lenses coated with anti reflective film layer。Due to the significant difference in hardness between the organic lens substrate and the anti reflective film layer，The new theory suggests that there needs to be an anti-wear film layer between the two，Enable the lens to provide cushioning when subjected to gravel friction，And it is not easy to produce scratches。The hardness of the third-generation wear-resistant film layer material is between that of the anti reflective film and the lens substrate，Its friction coefficient is low and it is not easily brittle。

　　4)The principle of fourth generation optical coating

　　The fourth generation of anti film technology uses silicon atoms，For example, Dior from the French company Essilo(titus)The hardening solution contains organic matrix，It also contains inorganic ultrafine particles including silicon element，Enhancing the toughness and hardness of the wear-resistant film。The most important modern wear-resistant coating technology is the immersion method，After multiple cleaning processes, the lens，Immerse in hardening solution，After a certain period of time，Lift at a certain speed。This speed is related to the viscosity of the hardening fluid，And it plays a decisive role in the thickness of the wear-resistant film layer。After mentioning it100 °cAggregation in the left and right ovens4-5hour，Coating thickness approximately3-5micron。

　　The market for optical coating productsThere are many types，The development is also particularly rapid，The level of product technology has also been continuously developed，The market competitiveness is relatively increasing。