Organic lens coating high difficulty than glass lenses. Glass can withstand temperatures above 300 ° C, while the organic lens in more than 100 ° C, will be yellow, and then quickly break down. Glass lenses can be used for antireflection coating materials commonly used magnesium fluoride (MgF2), but magnesium fluoride coating process must be above 200 ° C in the environment, which otherwise can not be attached to the lens surface, so the organic lens does not use it.
After the 1990s, with the vacuum coating technology, the use of ion beam bombardment technology, making the film and lens combination, the combination between the film has been improved. And the like to extract titanium dioxide, zirconium oxide high-purity metal oxide materials can be coated by the evaporation process on the surface of the resin lens, to achieve a good antireflection effect. Following the organic antireflection film lens coating technology for a description.
In an interview before the lens coating must be pre-cleaning, this cleaning requirement is very high, at the molecular level. Were placed in the cleaning tank of cleaning fluid, and the use of ultrasound to enhance the cleaning effect, when the lens after cleaning, into the vacuum chamber, in the process should pay special attention to avoid the air of dust and garbage and then adhered to the lens surface. The final cleaning is in a vacuum chamber, Magnesia in the process should pay special attention to avoid the dust and garbage in the air and then adhered to the lens surface. Final cleaning is carried out before plating in a vacuum chamber, and placed in the vacuum chamber of the ion gun to bombard the surface of the lens (for example argon ion), complete the cleaning process after its road antireflection film coating.
Vacuum evaporation process to ensure the quality of the pure coating material coated on the surface of the lens, while the evaporation process, the chemical composition of the coating material can be tightly controlled. Vacuum evaporation process for the film thickness can be precisely controlled, precision.
Of the glasses, the film is vital to the firm, is an important indicator of quality lenses. Lens quality indicators, including anti-wear lenses, anti-cultural centers, anti-temperature and so on. So now have a number of specific physical and chemical test methods, Barium titanate those wearing glasses in a simulated use conditions, the coating quality of the lens to film fastness test. These test methods include: salt water test, steam test, deionized water test, steel wool friction test, dissolution test, adhesion test, temperature test and humidity test, and so on. Source: