| 摘要 |
<p>An electron tube comprises a tubular glass envelope portion (10) having a central axis m and an inside diameter D. In the envelope portion (10) an electrode system (13) is inserted, the central axis 1 of which coincides with the central axis m. The electrode system (13) comprises a number of resilient elements (16) extending towards the wall of the envelope portion (10) and each pressing against a respective wall portion (19) thereof. The wall portions (19) are a distance R, <D/2 from the central axis m. In the non-assembled condition of the electrode system, the free ends (18) of the elements (16) are a distance R2 from the central axis 1, the relation R, <R2 <D/2 being satisfied. This measure permits preventing the occurrence of damage to the wall of the envelope portion (10) when the electrode system (13) is inserted into it.</p> |
