Single beam tracking tube
OwnerMarcellinus Petrus Carolus Michael Krijn, Oscar Hendrikus Willemsen +1inventors
InventorsMarcellinus Petrus Carolus Michael Krijn, Oscar Hendrikus Willemsen, Nijs Cornelis Van Der Vaart
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Abstract
Single beam color CRT of the beam tracking type having a display screen comprising a plurality of parallel phosphor lines, the CRT being equipped with a Distributed Main Lens type electron gun. The distributed main lens has a plurality of oblong grids which each have a single, oblong, beam passing aperture. The longitudinal axes of the grids and of the apertures are transverse to the direction of the phosphor lines. Correction means are provided to compensate for the astigmatism introduced by the main lens.
Claims10
Display device comprising a color cathode ray tube of the beam Index type having a display screen with a plurality of parallel phosphor lines and an electron gun, characterized by a single beam electron gun which comprises a main focus lens, said main focus lens including a plurality of oblong grids, each grid having a single, oblong, beam passing aperture, the longitudinal axes of the grid aperture and the grid being parallel and extending transverse to the direction of the phosphor lines.
Dependencies are inferred from the claim text.