Cathode ray tube having improved beam convergence

摘要

A cathode ray tube includes an evacuated envelope having a panel portion carrying a phosphor screen, a neck portion housing an electron gun and a funnel portion for connecting the panel portion and neck portion, the electron gun housed in the neck portion and a deflection device mounted in a transition region between the funnel portion and neck portion. The electron gun is provided with an electrode having a single opening common to the three electron beams and having correction electrodes disposed in vicinities of both edges of the single opening in the inline direction and extending substantially parallel with a cathode ray tube axis into a region downstream of an end surface of an anode electrode forming a main lens on a cathode side thereof and provided with electric field produced by the main lens, and the electrode having the single opening is electrically connected to the anode electrode.