| 摘要 |
The tube includes a magnet system with spring-focus for deflecting and focusing an electron beam. The magnet system includes a carrier (5) forming a yoke (6) with four angularly offset pole projections (7,8,9,10), arranged in opposing pairs. Coils (11,12,13,14) on the carrier are arranged in two pairs between pole projections. The coils of each pair carry a common current such that the electron beam (4) can be deflected by a coil pair in a direction which is different from that of the other coil pair.
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