Patent ID: 6310344
Filing Date: 2001-10-30
Classification: G03G,H01J

Abstract:
A wire-type corona charger for electrophotographically manufacturing a screen of a CRT, the wire-type corona charger being installed in a corona discharge apparatus and pivoted with a spacing over an entire interior surface of a panel faceplate of the screen along a first curvature which is one of curvatures of a horizontal axis and a vertical axis of the interior surface of the panel faceplate, so as to uniformly charge at least effective surface of a photoconductive layer with a desired voltage, the photoconductive layer being formed on an electro-conductive layer formed on the interior surface of the panel faceplate, the wire-type corona charger comprising:a pair of ground electrode plates each of which has arcuately-shaped upper edge with a curvature substantially equal to a second curvature, the second curvature being a remaining one of the curvatures of the horizontal axis and the vertical axis of the interior surface of the panel faceplate, the pair of ground electrode plates being grounded with being arranged in parallel and spaced with regular intervals apart;an insulating block disposed between the pair of the ground electrode plates and made from electrically insulating material, the insulating block having a plurality of wire electrode supporters so arranged that their upper ends are arranged to have a curvature substantially equal to the second curvature and lower than upper edges of the pair of ground electrode plates; anda wire electrode being supported by the upper ends of the plurality of wire electrode supporters, to which a high voltage is applied, so that at least effective screen of the photoconductive layer is charged uniformly.