| 摘要 |
An installation (5') for irradiating objects with an electron stream is proposed according to the invention, wherein the electron ray is caused to scan the object while this is moved forward. In order to make the irradiation more homogeneous and more efficient an extra magnetic lense (21) is located immediately beneath the region to be irradiated. This magnetic lense (21) deflects the electron ray in such a way that the different parts of the electron ray will be essentially parallel or a little convergent after said lense. The magnetic lense used consists of a two elongated permanent magnets located close to each other at a small distance. With an appropriate adjustment of the strength and distance of said magnets a suitable deflecting effect is obtained. In addition the permanent magnets are advantageously constructed of magnet elements having a plate-shape, between which a softmagnetical material is located. |
