Patent ID: 6629868
Filing Date: 2003-10-07
Classification: H01J

Abstract:
A method of manufacturing a cathode ray tube including a funnel-shaped part connected to a neck part, the tunnel-shaped part having an inner surface and a high-voltage connection element, by arranging the tube with its neck part in a downward position and covering the inner surface of the funnel-shaped part with a carrier liquid comprising a conductive material, the method comprising:supplying the carrier liquid through a pipe positioned near an edge of the funnel-shaped part and close to the inner surface of the funnel-shaped part; moving the pipe and the funnel-shaped part with respect to each other to obtain a first trajectory which is a non-closed loop, a projection of the pipe on the inner surface thereby describing a second trajectory on the inner surface of the funnel-shaped part which is substantially parallel to the edge of the funnel-shaped part, and allowing the carrier liquid to drain downwardly, thereby leaving a coating formed by a residue of the conductive material on the inner surface, the first trajectory being such that the high-voltage connection element is not completely provided with the coating.