The optical vacuum coating machine consists of a vacuum system, an evaporation system, a cooling system, and an electrical system. 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 and the exhaust system are connected by a connecting valve. In order to prevent the influence of air molecules on the sputtered ions and improve the quality of the film layer, the optical components and ion source must be placed in a vacuum environment during operation.
The exhaust system mainly consists of a mechanical pump, a Roots pump, and a vacuum pump, which is responsible for exhausting the gas in the vacuum tank and forming a vacuum environment in the tank. The evaporation system mainly refers to the film forming device. There are many types of film forming devices in the coating machine, such as resistance heating, electron gun evaporation, magnetron sputtering, radio frequency sputtering, ion plating, etc.
Optical vacuum coating machines apply thin films to optical components through vacuum sputtering, modifying the reflectivity and transmittance of incident light. To minimize reflection losses on the component surface and improve image quality, multiple layers of thin films are often applied. After coating an optical component, light reflects and transmits multiple times on the surface of the multilayer film, forming multiple beams of interference. By controlling the thickness and refractive index of the film layers, varying intensity distributions can be achieved. This principle can be used to manufacture polarizing reflective films, color splitting films, cold light films, and interference filters to meet more complex needs.
