How to control the uniformity of vacuum coating
Let's first understand how to debug the coating machine, because mastering the debugging coating machine is the key to using the coating machine How to debug the coating machine
1. test the vacuum speed of the equipment, check the leakage situation and the performance of each vacuum pump during the test.
2. Test the sealing performance of the equipment, that is, hold the pressure for 1 hour after pumping to the limit to see whether the pressure drop is up to standard, and exclude small leaks.
3. product trial, test other performance, such as transmission, heating, insulation and so on.
4. if there is a process guarantee, continue to make samples and test.
5. All tests should be recorded, signed by the recorder and confirmed by the user department or engineering department.
Because of the different principles of the lamp coating machine is divided into many types, just because it requires a high vacuum and has a unified name. Therefore, for different principles of vacuum coating, the factors affecting the uniformity are not the same. And the concept of uniformity itself will also have different meanings depending on the coating scale and film composition, as follows:
Uniformity is mainly reflected in three aspects:
1. the thickness of the uniformity, can also be understood as roughness, in the scale of the optical film (that is, 1/10 wavelength as a unit, about 100A), the uniformity of vacuum coating has been quite good, you can easily control the roughness in the visible light wavelength of 1/10 range, that is to say, for the optical characteristics of multi-arc ion coating machine, There are no obstacles to vacuum coating. However, if it refers to the uniformity on the atomic layer scale, that is to say, to achieve 10A or even 1A surface flatness, is now the main technical content and technical bottleneck in vacuum coating.
2. the uniformity of chemical components: that is, in the film, the atomic group of the compound is easy to produce uneven due to the small scale
Automobile Lamp Vacuum Coating Machine
Resistance Evaporation Vacuum Coating Machine(PVD Coating Machine)
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