Display tube having ferromagnetic field shapers to prevent...

Details Display tube having ferromagnetic field shapers to prevent... Display tube having ferromagnetic field shapers to prevent...

H - Electricity

01

J

313/35.3

H01J 29/70 (2006.01)

Patent

CA 1239975

ABSTRACT: Display tube comprising in the neck of an evac- uated envelope (1) consisting of a display window (2), a cone (3), and the neck (4), an electron gun (5) for generat- ing an electron beam (6) which is focused to form a spot on a display screen (7) provided on the inside of the display window (2), which is deflected over the display screen in two substantially mutually perpendicular directions (x,y) by the deflection fields of a system of deflection coils (9). If in such a tube field shapers are used at the gun end (10), which field shapers comprise four plates (27, 28, 29, 30) of ferromagnetic material arranged around the electron beam and extending away from the electron beam substantially in the deflection directions (x,y) and are connected at the gun end (10) at a substantially equal distance from the gun end (10), a construction is obtained which is easy to make and with which the edge fields (40, 50) of the deflection fields can locally be made barrel-shaped.

480636

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