HEAT TREATMENT DEVICE BY LINEAR ELECTRON BEAM

摘要

PURPOSE:To fix length of a linear section of an electron beam and to uniformalize distribution of the beam current density by providing a the part slit having a linear section of an electron beam with a slit such as to cut both ends of said linear section in the path of an electron beam. CONSTITUTION:An electron beam 7 forming a linear section part 6 (crossover) with a control electrode 3, which has a rectangular beam path hole 2 surrounding a coil emitter 1, and a positive pole 5 provided with a similarly rectangular beam path hole 4 is focused by the first electron lens for forming an image of the crossover in the position of a slot 9. Both end parts the linear section part 10 forming the crossover image are cut by the slit 9 for being projected on a work 12 by the second lens 11.