Optical lens processing is the main processing product of Evita, and one of the important applications is optical ultraviolet optical lens. As we all know, light ultraviolet rays are divided into near ultraviolet (UV-A, 320nm-400nm), ultraviolet (UV-B, 280nm-320nm) and ultraviolet (UV-C, 200nm-280nm) according to their wavelengths. UV-A easily causes corneal burns, vitreous opacity and cataracts; UV-B: easily causes keratitis, corneal dryness, conjunctival congestion and redness; UV-C: easily causes eye fatigue. The anti-ultraviolet function of the lens is very important. The processing process of optical lens manufacturers differs depending on the processing method.
1. Factors affecting the surface shape of optical lenses;
1. If the surface of the grinding tool is higher, the lens is lower. On the contrary, it is higher.
2. If you put the thimble out, the face shape will become lower, otherwise, the face shape will become higher.
3. The swing mainly ensures the wear area of the lens, so that the overall surface change is small.
4. When the angle is large, the surface shape is easy to become smaller, otherwise, it becomes larger (but it will be different with the change of other parameters). Therefore, it depends on whether the operator has experience.
Ultraviolet transparent optical lenses play a very important role in lens applications. The lens must be pre-cleaned before coating. The cleaning requirements are very high, reaching the molecular level. Various cleaning liquids are placed in the cleaning tank, and ultrasonic waves are used to enhance the cleaning effect. After cleaning the lens, place it in the vacuum chamber. In this process, special attention should be paid to avoid dust and garbage in the air from adhering to the surface of the lens. The final cleaning is carried out in a vacuum chamber. In this process, astronomical telescope manufacturers reminded to pay special attention to prevent dust and garbage in the air from adhering to the surface of the lens. The final cleaning is carried out before electroplating in the vacuum chamber. The ion gun placed in the vacuum chamber will bombard the lens surface (eg argon ions). After the cleaning process is completed, an anti-reflective coating is applied.
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