| 摘要 |
In a cathode ray tube wherein an electron beam emitted from a cathode electrode is focused by an electron lens and deflected by a deflecting device upon a flourescent screen, a character forming means is provided across the path of the electron beam comprising an insulating substrate and electrode elements formed on the opposite sides of the substrate which are arranged in a matrix. The substrate and electrode elements are formed with aligned perforations at respective cross points of the matrix and the perforations of the electrode elements at selected cross points are caused to create positive field to permit passage of the electron beam to display a selected character, numeral or pattern.
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