Abstract: An electrode assembly for an electrostatic lens of the in-line type electron gun for a color cathode ray tube, includes a pair of tubular electrodes arranged in axially opposing relation. Each of the tubular electrodes includes a main tubular electrode member closed at its one end by an end wall which has an aperture of the configuration obtained by partially overlapping a plurality of circular openings arranged in an in-line manner. An auxiliary electrode member is fitted into the main electrode member. The auxiliary electrode member has an end wall positioned separately from the end wall of the main electrode member by a predetermined distance. The end wall of the auxiliary electrode member is formed with a plurality of independent collars projecting therethrough in parallel to the axial direction of the respective circular openings of the overlapped-multicircle aperture and to superpose the corresponding circular openings of the overlapped-multicircle aperture in an axial direction.

Abstract: For use in an in-line electron gun of a cathode ray tube, a cup member comprises a planar plate having three apertures aligned with one another and a collar portion protruded from the planar plate. A height of the collar portion is between 2 mm and 6 mm, both inclusive. The collar portion may be either uniform in height or divided into a first pair of protrusions transversely of a predetermined straight line passing through the three apertures and a second pair of protrusions contiguous to the first pair of protrusions and lower in height than the first pair of protrusions.

Abstract: A color cathode ray tube has a three beam, in-line electric gun in one end of the tube focused on a phosphor screen on the other end of the tube. A common magnetic deflection field controls all three beams, thereby causing a coma distortion, if not corrected. The three beams pass through three aligned apertures in the bottom of a shield cup which corrects the distortion. As a result, eddy currents might form around the apertures to defeat its corrective functions. These eddy currents are eliminated by slender cuts formed in the shield cup and radiating from the two outside apertures.