Patent ID: 6857927

Claim:
A method of manufacturing a cathode ray tube, comprising the step of welding a color selecting electrode to a first and a second two opposite sides of a frame along a predetermined welding route, wherein a termination of the welding route is located at a center portion of each of the first and the second sides, the welding is conducted from one end portion of the first side toward the center portion of the first side, and after moving a welding head toward the other end portion of the first side, the welding is conducted from the other end portion of the first side toward the center portion of the first side, and the welding is conducted from one end portion of the second side toward the center portion of the second side, and after moving the welding head toward the other end portion of the second side, the welding is conducted from the other end portion of the second side toward the center portion of the second side.