Color cathode ray tube having an improved electron gun

A color cathode ray tube comprising:

• at least an electron gun, constituted by a cathode for forming a plurality of electron beams arranged in line and a plurality of electrodes, and
• a fluorescent screen, wherein
• said plurality of electrodes including an anode are arranged in the axial direction of the tube and have dissimilar potentials, and a main lens is constituted of said anode and another electrode neighboring said anode;
• said electrode neighboring said anode includes at least a first division electrode and a second division electrode having the same potential and arranged with a gap in the axial direction of the tube, and said second division electrode is opposed to said anode and has, in the opposed surface thereof, a single opening for passing said plurality of electron beams in common;
• and
• the length of said first division electrode in the axial direction of the tube is longer than the length of said second division electrode in the axial direction of the tube, and the length of said second division electrode in the axial direction of the tube is from about 1.0 to about 1.6 times as great as the diameter of said single opening in a direction at right angles with the in-line direction.

A color cathode ray tube comprising:

• at least an electron gun, constituted by a cathode for forming a plurality of electron beams arranged in line, a focusing electrode, and an anode constituting a main lens for focusing and accelerating said electron beams, and
• a fluorescent screen;
• wherein
• said focusing electrode and said anode are arranged with a gap in order from said cathode side toward the side of said fluorescent screen side in the axial direction of the tube;
• said focusing electrode is constituted by at least two division electrodes having the same potential along the axis of the tube to form at least one gap, and the division electrode opposed to said anode has, in the opposed surface thereof, a single opening for passing said plurality of electron beams in common;
• and
• said division electrode opposed to said anode has a length in the axial direction of the tube that is from about 1.0 to about 1.6 times as great as the diameter of said single opening in a direction at right angles with the in-line direction.