| 摘要 |
FIELD: physics.SUBSTANCE: device for protecting the inspection window of a vacuum chamber has a belt stretched along the window by driving and driven rollers. A thin elastic metal belt is made wider and 2.5 times longer than the window. The belt is laid and fastened in the groove of each roller. A rectangular frame with removable glass whose width is three times shorter than its length is inserted into the belt on its width. Grooves are made on the edges of each roller, with two cables not shorter than the length of the window and made in form of a spring being fastened in said grooves and stretched between the rollers below the belt. A support for the frame is placed near each roller. When the frame rests on the support near the driven roller, the cables are wound on the driving roller and the belt is wound on the driven roller. When the frame rests on the support near the driving roller, the cables are wound on the driven roller and the belt is wound on the driving roller. At least two guides are mounted on each side of the belt.EFFECT: protecting an elongated inspection window of a vacuum chamber from dust during visual monitoring of thermal evaporation processes.1 dwg, 1 ex |
