| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulse mode electron generator having a field emission cathode, reducing power consumption and simply controlled by an electric pulse generator easy to realize. SOLUTION: This pulse mode electron generator includes a field emission cathode 1 having electron emission micro-points 6-11 connected to a grid 13 biased by a biasing means 20 positively biasing the grid 13 and an anode 3 attracting the electrons emitted from the cathode 1. The grid 13 is biased by a fixed positive preliminary bias voltage generator 21 feeding a stop voltage slightly lower than the emission threshold voltage of the cathode 1, and it is connected in series to a positive pulse voltage generator 22 feeding the pulse component with a value sufficient to exceed the emission threshold voltage of the cathode 1. An electron pulse mode is easily generated, and power consumption required for generating electrons is reduced.
|
