Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1992-05-13
1993-10-26
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
H01J 2962
Patent
active
052569349
ABSTRACT:
Picture display device comprising a display tube with an electron gun having a hollow tubular structure with an inner surface on which a resistance structure of a material having a high electrical resistance is provided, which structure constitutes a focusing lens. The resistance structure is connected to at least two axially spaced electric contacts for connecting an anode voltage and at least one electric contact located in between for applying a focusing voltage. An electrode means of low-ohmic material for controlling the focusing lens by means of a dynamic correction signal is arranged in the region of the connection for the focusing voltage. Upon energization, the low-ohmic electrode means particularly exercises a non-rotationally symmetrical effect on the electron beam.
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patent: 3286114 (1966-09-01), Schlesinger
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patent: 4853589 (1989-08-01), Vrijssen
patent: 4961022 (1990-10-01), Hellings et al.
patent: 4988928 (1991-01-01), Vrijssen et al.
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Goorhuis Ger-Wim J.
Hellings Gerardus J. A.
Spanjer Tjerk G.
Van Engelshoven Jeroen
Vrijssen Gerardus A. H. M.
DeMeo Palmer C.
Kraus Robert J.
U.S. Philips Corporation
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