In daily life, we often see various electronic products with gorgeous appearance. Many people are curious about how the gorgeous appearance is made. In fact, it is coated with one or more layers of film on the surface of the components by physical methods through an optical vacuum coating machine. Process, optical coating changes the optical properties of the surface of electronic products to meet the market demand. Optical coating machines are not only used for coating electronic products, but also widely used in solar cells, projectors, LEDs, optical pickups, lenses, etc., with a wide range of applications. The following introduces the structure and principle of the optical vacuum coating machine, hoping to help you:

       The optical vacuum coating machine consists of a vacuum system, an evaporation system, a cooling system and an electrical system, wherein the vacuum system consists of a vacuum tank and an exhaust system. The vacuum tank is the main body of the coating machine, and the coating process is completed in the vacuum tank. The vacuum tank is connected to the exhaust system through a connecting valve. In order to prevent the influence of air molecules on sputtering ions and improve the quality of the film, the optical components and ion source must be placed in a vacuum environment during operation. The exhaust system is mainly composed of a mechanical pump, a Roots pump and a vacuum pump, which is responsible for discharging the gas in the vacuum tank and forming a vacuum environment in the tank. The evaporation system mainly refers to the part of the film forming device. There are many kinds of film forming devices in the coating machine, such as resistance heating, electron gun evaporation, magnetron sputtering, radio frequency sputtering, ion plating, etc.
      The optical vacuum coating machine coats the thin film on the optical element by vacuum sputtering, so as to change the reflectivity and transmittance of the element to the incident light. At the same time, in order to reduce the reflection loss on the surface of the element as much as possible and improve the image quality, multi-layer films are often coated. After the optical element is coated, the light is reflected and transmitted multiple times on the surface of the multilayer film to form multi-beam interference. By controlling the thickness and refractive index of the film, different intensity distributions can be obtained. Using this principle, polarized reflective films, color splitting films, luminescent films and interference filters can be manufactured to meet more complex needs.