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Let's understand why the mirror surface of the watch should be coated

Let's understand why the mirror surface of the watch should be coated

2022-06-23

Let's understand why the mirror surface of the watch should be coated





The mirror surface of the watch is coated for dazzling light. In short, anti glare mirror is to electroplate multilayer film on the lens to make it stick to the lens to prevent light refraction. Similar to automobile insulating paper, also known as multi-layer film or multi-color coating, it is commonly used in professional aviation, diving watches or watches with large mirror curvature. There are two kinds of anti glare glass: double-layer anti glare glass and single-layer anti glare glass. The difference is that the former is electroplated on both inside and outside of the lens, while the latter is only coated on the inside of the glass. There is little difference between the two.


Among the currently available optical thin film materials, the refractive index of magnesium fluoride (MgF2) is about the smallest, only 1.38. The reflectivity of light can be reduced from 4% to 1.8% by coating magnesium fluoride. At the same time, the transmittance is also increased. Of course, in order to improve the transmittance, multi-layer coating can also be used to increase the transmittance, that is, the inner and outer sides of the glass are coated. In particular, watches with large glass diameter and radian need to be coated. The coating can not completely eliminate reflection, but can only reduce reflection.


Some watches will be marked to indicate that the glass of the watch is coated, such as omega watches. On the card or label of a watch, it is indicated by a circle with the letter A. AA indicates that the watch glass is coated inside and outside. There are many reflective spots on the watch, including the case, dial and pointer, or gold or silver. Therefore, coating is a more convenient measure for wearing watches.


The coating of watch mirror should be completed by vacuum coating equipment.


The workpiece to be vacuum coated shall be carefully cleaned before entering the coating room. The surface pollution comes from various dust, lubricating oil, engine oil, polishing paste, grease, perspiration, etc. Adhere to the workpiece during processing, transportation and packaging. In order to avoid defects caused in the processing process, vacuum coating manufacturers can basically remove them by degreasing or chemical cleaning.


The cleaned surface shall not be stored in the atmospheric environment, but shall be stored in a closed container or cleaning cabinet to reduce dust pollution. The adsorption of hydrocarbon vapors can be minimized by storing glass substrates in newly oxidized aluminum containers. Because these vessels preferentially adsorb hydrocarbons. Vacuum coating treatment of highly unstable and water vapor sensitive surfaces shall normally be stored in a vacuum drying oven.


The vacuum coating process removes the dust in the coating room, establishes a high cleanliness workshop, and keeps the room highly clean. These are the basic requirements of the coating process for the environment. In areas with high air humidity, in addition to carefully cleaning the substrates and parts in the vacuum chamber before electroplating, baking and degassing are also required. To prevent oil from being brought into the vacuum chamber, pay attention to the oil return of the oil diffusion pump, and take oil blocking measures for the diffusion pump with high heating power.

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