Originally Posted by
hean
Reply to mauroventura
The shape of defects is whole surface with the spider web shape cracks. it happens to positive and negative lens.
AR question.
1. The AR material involved in the process is SiO2, ZrO2, ITO and hydrophobic.
2. Ion source use argon for precleaning, after that during the coating of the ITO layer, it is coat along with argon, oxygen and ion source.
3. I have monitored the temperature of the vacuum chamber, it stay around 70 celcius during the process. during the coating process, the peak temperature climbs to 74 celcius.
4. Yes, the vacuum coater are using cyropump as well.
Hardcoat question.
1. The hardcoat thickness is about 3.3um
2. the RH% in the hard coat room is around 40% humid.
Besides, I found that the concave surface tends to be smoother than the convex though i am using the same hydrophobic material and thickness for both side.
The curing time for the hardcoat is 3 hours 85 celcius. But during the curing time, the ovens is open frequently for putting lens inside. this is what i am worried about, will be this the cause of the crack?
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