ELECTRON BEAM ADJUSTING DEVICE

PROBLEM TO BE SOLVED: To provide an electron beam adjusting device capable of fine adjustment, by stabilizing running torque given to ring-shaped magnets at the time of a work for making fine adjustment to an electron beam, and capable of securing shielding effect against outer magnetic field, and capable of strengthening fixing force to a neck part of a device. SOLUTION: This device is so composed that locking pawls 11a, 11b,... are formed on one end of a magnet holding part 9 of a cylindrical holder 2, and plural pairs of ring-shaped magnets 3a, 3b, 4a, 4b, 5a, 5b are fitted outside by insertion through spacers 6, 6 between the engaging and fixing pawls 11a, 11b,... and a wall body 8, and that a fixing band 7 is mounted and clamped on a band engaging part 10 of the cylindrical holder 2. In this case, the length of the magnet holding part 9 is set below half of the full length of the cylindrical holder 2, and the thickness of the band engaging part 10 is set between 50% and 70% of the thickness of the magnet holding part 9.