Display tube including a helical focusing lens with a non-rotationally symmetrical lens element

Display tube including a helical focusing lens with a non-rotationally symmetrical lens element

A display tube comprising an electron gun having a beam-shaping part and a focusing structure. The focusing structure comprises an elongate hollow structure with a high-ohmic resistive layer provided on the inner and/or outer surface and comprises means for forming a non-rotationally symmetrical len...

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Bibliographische Detailangaben
Hauptverfasser: VAN ENGELSHOVEN, JEROEN, VAN DER HEIJDEN, ANTONIUS WILHELMUS FRANCISCUS, HIMMELBAUER, ERICH EDUARD, VRIJSSEN, GERARDUS ARNOLDUS HERMAN MARIA, HELLINGS, GERARDUS JACOBUS ARCADIUS, SPANJER, TJERK GERRIT, VAN ALPHEN, WILLEM MEIJNDERT
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Beschreibung
Zusammenfassung:A display tube comprising an electron gun having a beam-shaping part and a focusing structure. The focusing structure comprises an elongate hollow structure with a high-ohmic resistive layer provided on the inner and/or outer surface and comprises means for forming a non-rotationally symmetrical lens element in the area of the focusing structure. This may be a structure generating an electric multipole (for example, dipole or quadrupole) which may be incorporated particulary in the high-ohmic resistive layer.