Cathode-ray tube employing a separate grid structure to stabilize cathode current

A cathode-ray tube comprising an electron gun assembly that emits three electron beams, which are arranged in line, toward a phosphor screen,

• wherein the electron gun assembly comprises three cathodes arranged in line, three first grids arranged to face the associated cathodes, and a second grid with an integral structure that is disposed to face a phosphor screen side of the first grids,
• each of the first grids comprises a grid disc having an electron beam passage hole, and a cup-shaped grid support member that supports the grid disc, and
• the electron gun assembly comprises:
• an insulation member through which the three grid support members penetrate, the insulation member thus integrally holding the three grid support members;
• a cylindrical member that surrounds the insulation member and has an implant part;
• and
• an insulating support member that supports the implant part of the cylindrical member.