| 摘要 |
1,141,594. Electron beam furnaces. AIR REDUCTION CO. Ltd. 19 May, 1966 [11 June, 1965], No. 22233/66. Heading H1D. In an electron beam furnace a plurality of electron beams are first deflected laterally by a plurality of individually controllable magnetic fields and then transversely to the first direction of deflection by a magnetic field common to all the beams. As shown ribbonshaped beams generated by a plurality of guns 14 are focused by a coil 21 to pass through a plurality of slits 22, 23. Magnetic core members, 40 42, 44 having separately energized coils on side limbs (not shown) provide the first set of deflection fields (parallel to the plane of the paper). The core members may be provided with cooling coils. The common magnetic field (perpendicular to the plane of the paper) is set up by a rectangular core having separately energized coils on its side limbs 58, 62 and triangular top and bottom plates 70. The plates 70 are triangularly shaped so as to concentrate the magnetic flux in the central plane of the rectangular core. By suitable adjustment of the currents through the various coils the impact pattern on the heated material 26 may be varied and, if desired, in a cyclically repetitive manner. |
