| 摘要 |
<p>This device, in which the deflector includes deflection coils (2) connected to the output of means (3) for control of their supply and including means (4) for correcting this supply so as to adjust the value of the magnetic field produced by the coils (2) as a function of a reference value, is characterised in that the correcting means comprise at least one coil (5) for measuring the actual magnetic field produced by the coils of the deflector, and incorporated in the deflector (1), and the output of which is connected to the input of integration means (6), the output of these integration means (6) being connected to means (7) of comparing the value of the actual field with the reference value, the error output from these means of comparison (7) being connected to the input of amplifying means (9) whose output is connected to means (10) for correcting the current flowing in the coils. <IMAGE></p> |
