Patent ID: 7071606

Claim:
A color picture tube apparatus with three electron beams arranged in an in-line manner, emitted from an electron gun and being deflected by a self-convergence deflection magnetic field, the color picture tube apparatus comprising: a main lens portion in the electron gun, the main lens potion includes a main lens that has a focusing effect in the in-line direction and a direction perpendicular thereto and an electrostatic lens that is disposed at a stage immediately after the main lens and has a focusing effect in the in-line direction and a diverging effect in the direction perpendicular thereto; wherein when a spot formed in a central portion of a screen is just in focus, the spot in the central portion of the screen has a dimension along the in-line direction that is different from that along the direction perpendicular to the in-line direction, and the main lens portion further includes a four-pole lens that is disposed at a stage immediately before the main lens at a time of deflection in at least the central portion of the screen and has a diverging effect in the in-line direction and a focusing effect in the direction perpendicular thereto.