| 摘要 |
<p>TITLE OFF-AXIS ELECTRON GUN INVENTORS Ronald M. Hutcheon The purpose of the off-axis electron gun is to generate a beam of electrons and to deflect the beam onto the axis of a device which utilizes the beam. The off-axis electron gun includes an arcuate wire electron emitting source, a non-intercepting azimuthally asymmetric electrode located at and around the electron source, and an anode plate with a beam exit hole. The non-intercepting electrode has an arcuate slot subtending a predetermined angle at a predetermined radius from the beam axis. The arcuate wire electron source is mounted within the slot in the electrode, but is electrically isolated from the electrode. The electrode is asymmetric in shape such that when selected voltages are applied between the wire source, the non-intercepting electrode and the anode, an electric field is produced which directs the electrons towards the axis and simultaneously focusses the beam and deflects it onto the axis.</p> |
