Elektronenbundel-opweksysteem met hoge-stroom kathode

PURPOSE: To improve the temperature stability of a high current electrode and stably form a precise image by forming an electron beam system for a TV picture tube with a cathode device, having a high current cathode and the first electrode of a lattice type in a specified structure. CONSTITUTION: An electron beam system 10 for a TV picture tube is formed with an electron beam generating cathode device 11 and the first electrode 12 of a lattice type having a pin hole opening. The cathode device 11 is a high current cathode, and the adjacent lattice electrode 12 is provided with an electron beam passing opening 22. The lattice electrode 12 is arranged in parallel with the electron beam emission surface 21 of the high current cathode 13 to connect the terminal part 26 of a cladding surface 24 to the side face of a region 23 facing the emission surface. In this case, the cladding surface is inclined at α, 95-175 deg., to a region including the electron beam passing opening 22 and the region 23 including the electron beam passing opening 22 of the high current cathode 13, the cladding surface 24 and a part of the lattice electrode 12 are formed with a high alloy steel foil 19 containing 25-55% Ni.