| 摘要 |
Focusing unit for generating a focusing magnetic field in an arc discharge apparatus designed for the plating of objects (7), said arc discharge apparatus having a cathode (2) and an anode (3) for producing a plasma beam by means of an arc set up between them, an igniter (4) for starting an arc and a cylindrical winding (9) for accelerating the plasma beam. The focusing unit (10) is placed in conjunction with the cathode (2) so that it produces in the region of arc discharge a magnetic field oriented in the direction of the longitudinal axis (11) of the cathode (2) to focus the plasma beam to a desired point in the cross section of the cylindrical winding (9), preferably to its centre. |
