Cathode ray tube of the index tube type

摘要

A picture display device comprises a cathode ray tube of the index type for producing at least one electron beam and having a pattern of index elements and parallel phosphor lines. An index signal is produced during operation. In response to the index signal the position of the electron beam is changed by a deflector means. The cathode ray tube comprises an electron gun having a main lens portion and the deflector means comprises at least two electrostatic deflectors (41, 42) positioned in front of the main lens portion (DML), the deflectors having opposite effects.