Watch glass coating and precautions
Any glass will have a reflective, including flat and have a curved glass, so, like many lens optical instruments (including glasses), the increase in order to reduce reflection and transmission ratio, you need to vacuum coating equipment to do the above in the glass coating processing. Especially glass diameter compare Japanese radian watches, need to increase the coating processing, can not completely eliminate the reflective coating, can only be reduced.
In the optical film material is currently available, a magnesium fluoride (MgF2) of refractive index of about the minimum, only 1.38, the magnesium fluoride coating can make use of light reflection rate of 4% to 1.8% while also increasing the transmission than, of course, in order to improve the transmission rate, it can also be used for multi-layer antireflection coating that both sides are coated inside and outside of the glass.
After the glass coating process above, will be showing a hint of violet color, typical is a camera or telescope lens, are usually treated with magnesium fluoride coating (MgF2), the refractive index of magnesium fluoride is 1.38, both much lower than the refractive index of ordinary glass, even lower than the sapphire glass (ordinary glass refractive index of 1.52, sapphire 1.76), where the higher the refractive index, the reflection is stronger. Therefore, the effect of the watch sapphire glass coating will be better after.
Some watches will create a flag to indicate that the watch glass is processed through the coating, such as Omega watches, the watch on the card or tag, with a circle inside a A letter to represent, while the AA said watch both inside and outside the glass coating on both sides. Originally reflex points on the watch, the more, including the case, dial, hands, not Guangcan gold, silver Guangcan is, therefore, the coating is more convenient to use one of the measures to wear watches, watch glass coating also does not like the camera lens Which obviously, some hard to see.
Some watches will create a flag to indicate that the watch glass is processed through the coating, such as Omega watches, the watch on the card or tag, with a circle inside a A letter to represent, while the AA said watch both inside and outside the glass coating on both sides. Originally reflex points on the watch, the more, including the case, dial, hands, not Guangcan gold, silver Guangcan is, therefore, the coating is more convenient to use one of the measures to wear watches, watch glass coating also does not like the camera lens Which obviously, some hard to see.
As noted in the information, magnesium fluoride (MgF2) crystal Mohs hardness of 6, is the general hardness, but because of the thickness of the thin film, so it is easy to be worn out. Common coating on the glasses are also very easy to be worn, this also depends on the specific use, such as glasses usually only add water wash detergent behind, we should be much longer than the direct use a cloth to wipe the hold time The watch glass is the same.
Coating the inside of the watch glass will not be worn when glass coating damage, there will be a careful look mottled pattern of cases, while attention is required, watches in the long-term storage under storage, be sure to pay attention to moisture, long time in the humid environment the glass surface will be moldy, but also undermines the coating layer.
Coating the inside of the watch glass will not be worn when glass coating damage, there will be a careful look mottled pattern of cases, while attention is required, watches in the long-term storage under storage, be sure to pay attention to moisture, long time in the humid environment the glass surface will be moldy, but also undermines the coating layer.
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