| 摘要 |
The invention relates to a web monitoring beam (10) comprising at least one camera (11) placed therein and being equipped with a camera lens cleaning system with means for generating compressed air. The camera (11) placed inside the web monitoring beam (10) is a pinhole camera with a chamber area (13) between the lens (12) and the pinhole (14) of the pinhole camera. Compressed air is blown into the chamber area (13), which compressed air exits via the pinhole of the pinhole camera, removing the impurities from the chamber area. The invention also relates to a pinhole camera (11) comprising a cleaning system. |
