Whether it is made of inorganic or organic materials, in daily use, friction with dust or grit (silicon oxide) will cause the lens to wear and scratches on the surface of the lens. Compared with glass sheet

　　, the hardness of organic materials is lower and it is more prone to scratches. Through the microscope, we can observe that the scratches on the lens surface are mainly divided into two types. One is the scratches caused by grit, which are shallow and small, and it is not easy for the wearer.

　　Perception; the other is the scratches produced by larger grit, which are deep and rough in the periphery, and the central area will affect vision.

　　 The most fundamental way to judge and test the abrasion resistance of the optical lens anti-wear film is clinical use. Let the wearer wear the lens for a period of time, and then observe and compare the lens with a microscope. Wear and tear. Of course, this is usually the method used before this new technology is promoted.

　　-style promotion, the current quicker and more intuitive test method we commonly use is:

　　1. The relationship between anti-reflection coating and anti-wear coating

　　 The anti-reflection coating on the surface of the lens is a very thin inorganic metal Oxide material (thickness less than 1 micron), hard and brittle. When it is plated on a glass lens, since the base is relatively hard and the grit is scratched on it, the film

　　 is relatively less prone to scratches on the optical lens; but the anti-reflection film When it is plated on an organic lens, since the base is relatively soft, the grit is scratched on the film, and the film is easily scratched.

　　2, frosting test

　　 Put the lens in a publicity material containing gravel (specify the grain size and Hardness), rub back and forth under certain control. After the end, use a haze meter to test the amount of diffuse reflection of light before and after the lens is rubbed, and compare it with the standard

　　 quasi-lens.

　　3) Steel wool test

　　 Use a specified steel wool, under a certain pressure and speed, The number of times of rubbing on the surface of the lens, then use a haze meter to test the amount of diffuse reflection of light before and after the focusing lens is rubbed, and compare it with the standard lens.

　　Of course, we can also do it manually, rub the two lenses with the same pressure the same number of times, and then observe and compare with the naked eye.

　　 can change the direction of light propagation, and can change the relative spectral distribution of ultraviolet, visible or infrared light. According to optical characteristics, optical glass can be divided into: colorless optical glass, anti-radiation optical glass, radiation resistant optical glass, colored optical glass, ultraviolet and infrared optical glass, and optical quartz glass.

　　 lenses can be widely used in security, automotive, digital cameras, lasers, optical aspheric mirrors and other fields. As the market develops from time to time, lens technology is becoming more and more The application is universal. (Lens) The lens is made according to the law of light refraction. A lens is an optical element made of transparent materials (such as glass, crystal, etc.).

　　 Lens is a refracting lens, and its refractive surface is a transparent body with two spherical surfaces (spherical surface and one part), or one spherical surface (spherical surface and one part) and one plane. The images it forms have real and virtual images.

　　Convex lens: thick in the middle, thin at the edge, there are three kinds of biconvex, plano-convex, and concave-convex;

　　 concave lens: middle Thin, thick edge, there are three kinds of double-concave, flat-concave, convex-concave.