| 摘要 |
The electron beam forming device uses a field effect electron emitter with a control electrode disposed on the surface thereof for field effect release of electrons. The control electrode can be shaped to produce a selective or segmented field for developing a particular current path. However, the shape of the beam is determined by the shape of the conductor of the backing plate which is external to tube housing instead of the internal control electrode. Thus multiple beams can be obtained from one emitting array and the final configuration of the device can be changed after the device is built.
|
