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 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 said fluorescent screen side in the axial direction of the tube;
• said focusing electrode includes at least a first division electrode and a second division electrode which are electrically connected to one another and having the same potential, said first and second division electrodes being arranged with a gap in the axial direction of the tube;
• 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;
• said first division electrode is opposed to said second division electrode and has, in the opposed surface thereof, individual electron beam passing openings for the respective electron beams;
• a length of said first division electrode in the axial direction of the tube is longer than a length of said second division electrode in the axial direction of the tube;
• a diameter of said individual electron beam passing openings in the surface of said first division electrode opposed to said second division electrode is smaller than the diameter of said single opening in the surface of said second division electrode opposed to said anode in a direction at right angles with the in-line direction;
• and
• the length of said second division electrode in the axial direction of the tube is not smaller than the diameter of said single opening in a direction at right angles with the in-line direction.