Cathode-ray tube with improved electron gun

H - Electricity – 01 – J

Patent

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H01J 31/15 (2006.01) H01J 29/50 (2006.01) H01J 29/58 (2006.01)

Patent

CA 2103981

An improved cathode-ray tube includes a viewing screen and an electron gun for generating and directing three electron beams toward the screen. The tube includes a horizontal axis, a vertical axis and a longitudinal axis. A horizontal plane of said tube includes the horizontal and longitudinal axes. The gun includes a plurality of electrodes spaced in order from three cathodes, with the furthest electrode from the cathodes being interconnected to a tube anode. The plurality of electrodes form a beam forming region, a first quadrupole lens, a main focus lens and a second quadrupole lens in the path of each electron beam. The improvement comprises the placement of the second quadrupole lens on the anode side of the main focus lens, with the first quadrupole lens being diverging for defocusing the beams in the horizontal plane, and the second quadrupole lens being converging for focusing the beams in the horizontal plane.

Un tube cathodique amélioré qui comprend un écran d'affichage et un canon à électrons pour la génération et l'orientation de trois faisceaux d'électrons vers l'écran. Le tube comporte des axes horizontal, vertical et longitudinal. Un plan horizontal du dit tube comporte les axes horizontal et longitudinal. Le canon à électrons comprend une pluralité d'électrodes disposés en séquence par rapport à trois cathodes, l'électrode le plus éloigné des cathodes étant lié à un anode de tube. La pluralité d'électrodes créent une région de formation de faisceau, une première lentille quadrupôle, une lentille à focale principale, ainsi qu'une deuxième lentille quadrupôle dans la trajectoire de chaque faisceau d'électrons. L'amélioration vient de l'emplacement de la deuxième lentille quadrupôle du côté anode de la lentille à focale principale, la première lentille quadrupôle étant du type divergent pour la défocalisation des faisceaux sur le plan horizontal, et la deuxième lentille quadrupôle étant du type convergente pour la focalisation des faisceaux sur le plan horizontal.

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