| 摘要 |
To increase the measuring accuracy during the traversing of the thread (15), a diffusing disc (13) is inserted into the light barrier between the thread (15) and the light source and, as measured parallel to the thread (15), has a width decreasing towards the middle of its surface. However, the diffusing disc can also possess a diaphragm which is segment-like, triangle-like, diamond-like or limited by a line resembling a conical section. <IMAGE>
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