| 摘要 |
The invention relates to a cathode ray tube having an envelope 1 comprising a screen 2 and an electron gun 3 which is situated inside the envelope 1 opposite to the screen and which has three electrodes 4, 5 and 6, which electrodes are provided coaxially on the inner wall of a glass tube 7 in adjoining places having diameters differing for each electrode. In order to obtain, for example, smaller dimensions and a better alignment of the electron gun and a higher resolution, a focusing lens associated with the electron gun 3 is a high-ohmic resistance layer 8 having a spiral shape 9.
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