The present invention provides an electron gun for a cathode ray tube that
forms a main focus lens of a maximum diameter within a neck of a limited
diameter to thereby realize high focus performance and resolution
characteristics. The electron gun includes a single cathode emitting
electrons; first and second grid electrodes forming a triode portion with
the cathode; a third grid electrode provided subsequent to the second grid
electrode; a fourth grid electrode provided subsequent to the third grid
electrode and to which a focus voltage is applied, the fourth grid
electrode including an input section positioned opposing the third grid
electrode and an output section connected to the input section; a fifth
grid electrode mounted surrounding part of the fourth grid electrode with
a predetermined gap therebetween and to which an anode voltage is applied;
and a connector interconnecting the third grid electrode and the fifth
grid electrode, wherein the output section of the fourth grid electrode is
exposed.
