Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1984-07-05
1987-09-01
Nelms, David C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313431, H01J 2950, H01J 2970
Patent
active
046911391
ABSTRACT:
A display tube comprising an evacuated envelope having a display window, a conical portion and a neck, and an electron gun in the neck for generating an electron beam which is focused to form a spot on a display screen on the display window, the electron beam being deflected over the display screen in mutually perpendicular directions by pin-cushion-shaped deflection fields produced by a system of deflection coils. Field shapers are provided at the gun end of the tube which comprise two mutually perpendicular pairs of flat plates of ferromagnetic sheet material, the respective pairs of plates being arranged coaxially around the electron beam and respectively extending in the respective deflection directions. The plates are supported so that the gun ends thereof are at substantially the same distance from the electron gun, and cause the edge fields of the deflection fields to be barrel-shaped so as to prevent defocusing of the beam by the pin-cushion deflection fields.
REFERENCES:
patent: 3866080 (1975-02-01), Barkow
patent: 4609847 (1986-09-01), Ashizaki et al.
Gerritsen Jan
Mensies Otto
Briody Thomas A.
Nelms David C.
Oen William L.
Oisher Jack
Streeter William J.
LandOfFree
Display tube having ferromagnetic field shapers to prevent beam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Display tube having ferromagnetic field shapers to prevent beam , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display tube having ferromagnetic field shapers to prevent beam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1266864