The antifouling film is mainly made of fluoride, and there are two processing methods, one is immersion method, the other is vacuum coating, and the most common method is vacuum coating. After the antireflection coating is completed, fluoride can be coated on the reflective coating by evaporation process. The antifouling film can cover the porous antireflection film layer, and reduce the contact area between water and oil and the lens, so that oil and water droplets are not easy to adhere to the lens surface, so it is also called waterproof film.
For organic lenses, the ideal surface system treatment should be a composite film including anti-wear film, multi-layer antireflection film and top film antifouling film. Generally, the thickness of the anti-wear film coating is the thickest, about 3-5 mm, the thickness of the multilayer antireflection film is about 0.3 mm, and the thickness of the top anti fouling wax coating is the thinnest, about 0.005-0.01 mm. Take the crystal and composite film of the French Isilo Company as an example, the wear-resistant film with organic silicon is first coated on the lens substrate; Then, IPC technology is used to conduct pre cleaning before antireflection coating with ion bombardment; After cleaning, high hardness zirconia (ZrO2) and other materials are used for vacuum plating of multilayer antireflection coatings; Finally, a waterproof membrane with a contact angle of 110 is coated. The successful development of diamond composite film technology shows that the surface treatment technology of organic lens has reached a new height.
The waterproof and dust-proof film reduces the contact area of water, dust and other dirt with the lens to an angle of 110 degrees, which makes it difficult to adhere to the lens surface. Therefore, the filter surface will be more smooth and clean, adding the functions of water, fog, dust, fingerprint and other anti pollution. It can be widely used on camera lens, window piece of electronic digital products, touch screen and other window products, such as dust-proof film and other optical products. Usually, the waterproof and dust-proof film is used together with the antireflection film on the window products, which can also increase the hardness of the lens surface and prevent scratches. Here, scratch prevention is not 100% scratch prevention. Here, it refers to conventional small scratches that protect windows. This kind of coating can also be used together with reflective film in vehicle rear-view mirror products. When the water falls on the surface of the filter, it can slide off quickly, just like the water falls on the lotus leaf, so that the optical window can maintain a clear view.
