The application of pvd coating machine coating technology on optical lenses, the earliest lenses did not have optical coatings, and some even did not even have the internal extinction of the lens barrel and the blackening of the lens edges, and then a single-layer coating appeared, but this is mainly used. It is used in military telescopes to achieve lens extinction and reduce the possibility of being discovered by the enemy (for example, the T* coating of Zeiss Dingdingming was first developed for military use)

        The coatings on modern lenses can be divided into two types, one is called anti-reflection coating, which increases the light transmittance, while the other coating changes the color spectrum transmission characteristics of the lens, such as a lens Although the optical material used in a certain lens has a good index of refraction, but there is a yellowing phenomenon, then coat it with a spectral blocking film to correct the color cast (the three Pentax princesses all use high refraction. glass, so they are slightly yellowish), and now the development of coating technology can compensate for the inadequacies of some cheaper optical materials, the design of the lens does not have to be done with expensive special formula optical glass as in the past, so the new Most of the lenses generally have multi-layer coatings on the air contact surface of each lens, which also highlights the important role of coatings for lenses on the other hand. Nowadays, the application of coating machine on optical lenses is generally called optical pvd coating machine or optical lens coating machine.
       When many people wear glasses, they are required to add a film to the lenses. There are two main types of optical pvd coating machines for adding films to lenses: one is anti-reflection film, that is, by coating the front surface of the lens with multiple layers of transparent materials with different refractive indices and different thicknesses, the principle of light interference is used to reduce the excess on the surface of the lens. reflected light. After the lens is added with an anti-reflection film, the transparency of the light will increase, the wearer will feel that the glare is reduced, and the vision will be more vivid and bright. The other is to add hard film, mainly used for resin lenses. It is generally added to the front surface of the lens to enhance the anti-wear ability of the resin lens, and at the same time, the permeability of light is also enhanced. When cleaning the hard-coated lens, the user should first wash the front and back surfaces of the lens with clean water, and then dry it with a clean soft cloth. Be careful not to wipe the lens when it is dry. If the ordinary lens can be seen clearly, there is no need to add the film. If it is necessary, the resin lens can be added with an anti-reflection film or a hard film, and the glass lens generally only has an anti-reflection film.