BEADING DEVICE FOR ELECTRON GUN

PURPOSE:To prevent the flawing and burring of the surface of a grid at the time of assembling an electron gun, and enhance withstand voltage. CONSTITUTION:When an electron gun 10 is assembled, each part 11-17 is placed on the receiving part 21 of a support base 2. A fist spacer 22 is inserted between a G2 grid 13 forming low voltage side and a G3 grid 14 forming high voltage side. The second grid 13 side of the first spacer 22 is molded by a highly hard resin excellent in heat resistance and wear resistance. Each part 11-17 of the electron gun 10 is pressed by a fixing lever 3, and a beading 19 is fixed in this state. In such a beading device 1, since one surface side of the first spacer 22 is formed of the resin, the surface of the G2 grid 13 can be prevented from being flawed or burred at assembling. Thus, the withstand voltage of the electron gun is improved, and characteristic such as brightness of a cathode-ray tube can be improved.