Cathode-ray tube

[0051] In the electron gun assembly each of the first grids G1 is formed of a cup-shaped electrode body having an electron beam passage hole. The bottom face of each cup-shaped electrode body has one electron beam passage hole. The second grid G2 is formed of a plate electrode body and has three electron beam passage holes. Each of the third to seventh grids G3 to G7 is formed of a plurality of cup-shaped electrode bodies that are combined. The bottom face of each cup-shaped electrode body has three electron beam passage holes. The cathodes K, heaters H and grids are integrally fixed by a pair of insulating support members 27 that are formed of glass.

[0052] A stem section 19 is provided at an end portion of the neck 16. The stem section 19 seals the envelope 10 in a vacuum state. A plurality of stem pins 20 penetrate the stem section 19 in the state in which the envelope 10 is kept airtight. The stem pins 20 are electrically connected to the respective electrodes of the electron gun a

[0081] Furthermore, in the second embodiment, the first grids G1 are constructed as follows. The three first grid support members 41 are made to penetrate the insulation member 33. The cylindrical member 32 is then fixed so as to surround the insulation member 33. Thereafter, the three first grid discs 40 are fixed by welding to the associated three first grid support members 41. It is easy, therefore, to correct non-uniformity in attachment precision, such as the pitch, flatness and linearity of the three first grid support members 41, which will occur when the first grids G1 are fixed. The precision in assembly of the three first grid discs 40 can be enhanced.

[0082] Hence, in the electron gun assembly with the above-described structure, each of the IK values can quickly be set at the predetermined fixed value from the time immediately after power-on. In addition, as regards the color cathode-ray tube that incorporates this electron gun assembly, when the color cathode-ray tube is ass