ELECTRON GUN FOR COLOR CRT AND COLOR CRT

摘要

PROBLEM TO BE SOLVED: To prevent beam from striking a field correction electrode in a focusing electrode and an accelerating electrode having the field correction electrode with electron beam passing holes.;SOLUTION: The focusing electrode 2a and the accelerating electrode 2b are formed of the field correction electrode 8 and a cylindrical electrode 9. A first bar ring part 5a is projectedly formed on the inner surface of the cylindrical electrode 9 at a position corresponding to a center beam passing hole 7G, and a second bar ring part 5a is projectedly formed thereon at a position corresponding to side beam passing holes 7R and 7B. In a main lens 6 formed of the focusing electrode 2a and the accelerating electrode 2b, the lens strength of a center beam passing part 16G is increased by increasing the length of the first bar ring part 5a in Z-axis direction more than that of the second bar ring part 5b. Whereas the area of the center beam passing hole 7G is increased to lower the lens strength of an electron lens 10 formed in the center beam passing hole 7G.;COPYRIGHT: (C)2003,JPO