Application of vacuum coating machine on optical lens
The application of vacuum coating machine coating technology to optical lenses, the earliest lenses did not have optical coating, and some even did not have the matting inside the lens barrel and the blackening of the lens edge, and then a single layer coating appeared, but this is mainly used It is used in military telescopes to achieve lens matting and reduce the possibility of being discovered by the enemy (for example, Zeiss’s T* coating was first developed for military use). In the field of civilian cameras, 1941 Kodak produced the first coated lens Camera Ektra, but the great development of coating technology should start with Pentax's SMC-coated too bad horse lens in the early 70s.
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The coating on modern lenses can be divided into two types. One is called antireflection 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 refractive index and other indicators of the optical material used in a certain lens are very good, but there is a yellowish phenomenon, then coat it with a spectrum blocking film to correct the color cast back (the three Princesses of Pentax use high refractive index Glass, so it is slightly yellowish), and the development of coating technology can compensate for the shortcomings of some relatively cheap optical materials. The design of the lens does not have to be completed with expensive special formula optical glass as in the past, so the new The lenses of the lens generally have multiple layers of coating on the air contact surface of each lens, which also highlights the important role of coating for the lens from another aspect.
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When many people wear glasses, they require a film on the lenses. There are two main types of lens coating: one is anti-reflective coating, which means that by coating the front surface of the lens with multiple layers of transparent materials with different refractive indexes and different thicknesses, the principle of light interference is used to reduce the excess reflected light on the lens surface. After the anti-reflection film is added to the lens, the light permeability will increase, the wearer feels that the glare is reduced, and the vision is more real and bright. The other is hard coating, which is mainly used for resin lenses. It is generally added on the front surface of the lens to enhance the abrasion resistance of the resin lens and at the same time enhance the light permeability. When cleaning the hard-coated lens, the user should first wash the front and back surfaces of the lens with clean water, and then blot it dry with a clean soft cloth. Be careful not to wipe the lens when it is dry. If ordinary lenses can be seen clearly, there is no need to add film. If you want to add, resin lenses can be added with anti-reflective film or hard film. Glass lenses generally only add anti-reflective film.