Color cathode ray tube apparatus

A color cathode ray tube apparatus comprising:

• a valve including a face panel and a funnel;
• a phosphor screen disposed on an inner surface of the face panel;
• an electron gun disposed inside the valve and including an electron beam generating portion for generating three electron beams consisting of a center electron beam and a pair of side electron beams that are arranged in a horizontal direction, a focusing electrode and an anode electrode that are disposed in this order from the electron beam generating portion side along a traveling direction of the three electron beams, a first field correction electrode disposed inside the focusing electrode, and a second field correction electrode disposed inside the anode electrode;
• and
• a deflector disposed at an outer circumference of the funnel for deflecting the three electron beams emitted from the electron gun,
• wherein the focusing electrode comprises a tubular structure including, at an end portion on the anode electrode side, a noncircular aperture common to the three electron beams and having a major axis in the horizontal direction and a minor axis in a vertical direction,
• wherein the anode electrode comprises a tubular structure having, at an end portion on the focusing electrode side, a noncircular aperture common to the three electron beams and having a major axis in the horizontal direction and a minor axis in the vertical direction, and
• wherein the focusing electrode, the first field correction electrode, the anode electrode and the second field correction electrode form a main lens having a focusing force in the vertical direction stronger than its focusing force in the horizontal direction inside the focusing electrode, and a diverging force in the vertical direction stronger than its diverging force in the horizontal direction inside the anode electrode, by applying a focus voltage to the focusing electrode and the first field correction electrode and applying an anode voltage higher than the focus voltage to the anode electrode and the second field correction electrode, the main lens focusing the three electron beams on the phosphor screen.