| 摘要 |
PURPOSE: To provide a thin image display device which does not have changes in brightness by including a local electron duct having the wall of an electrically insulating material and a means for taking out each electron flow at a predetermined position and for directing it toward a desired position on a fluorescent screen. CONSTITUTION: An electron duct comprises slender cavities 14 defined by the walls 8 of an electric material having a secondary emission coefficientδ. The walls have electric fields in the longitudinal direction of the cavities 14, the electric fields have strength E, and the wall of each cavity 14 facing a fluorescent screen has a plurality of openings 15 in such a manner that all the openings 15 together constitute an array of columns and lines.δand E take respective values such that electrons are carried in the cavities. In order to produce the electrons carried in the vacuum in the electron duct, a line cathode 16 portion comprising a plurality of electron emitters parallel to the fluorescent screen can be used.
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