Electron gun for cathode-ray tube and color cathode-ray tube equipped with the same

An inline-type electron gun for use in a cathode-ray tube, the electron gun comprising:

• a triode section in which cathodes, a first electrode, and a second electrode are formed in the stated order;
• and
• a main lens section including at least a third electrode, the main lens section accelerating and converging electron beams emitted from the triode section toward a phosphor screen,
• wherein
• electron beam passage apertures are formed in the second electrode,
• when a current of each electron beam is not more than 0.1 mA, the following relationship is satisfied:
• Ay>0, Ax>0, Ay/Ax<1.0
• and when the current of each electron beam is not less than 2 mA, the following relationship is satisfied:
• Ay>0, Ax>0, 0.9<Ay/Ax
• where
• Ax is a maximum value of an acceleration component perpendicular to a center axis of each electron beam and directed toward the center axis, in an acceleration in an outermost part in an inline direction of the electron beam, in the vicinity of a third electrode side of the electron beam passage apertures of the second electrode, and
• Ay is a maximum value of an acceleration component perpendicular to the center axis of the electron beam and directed toward the center axis, in an acceleration in an outermost part of the electron beam in the direction perpendicular to the inline direction and perpendicular to a traveling direction of the electron beam, in the vicinity of the third electrode side of the electron beam passage apertures of the second electrode.