发明名称 |
Electron gun operating by secondary emission under ionic bombardment |
摘要 |
The electron gun comprises an ionization chamber, adjacent to a high voltage chamber. In the wall common the both chambers provision is made for an extraction grid. On the opposite side, the ionization chamber comprises an outlet window for the electrons similar in shape to the extraction grid, and accompanied by a fine metallic foil. The high voltage chamber comprises a cathode brought to a high negative voltage. By giving the two grids the shape of similar parallel strips, a masking effect and a focusing effect are obtained at one and the same time which allows the efficiency of the electron gun to be increased.
|
申请公布号 |
US4777370(A) |
申请公布日期 |
1988.10.11 |
申请号 |
US19860932141 |
申请日期 |
1986.11.18 |
申请人 |
OFFICE NATIONAL D'ETUDES ET DE RECHERCHE AEROSPATIALES (ONERA) |
发明人 |
PIGACHE, DANIEL;DANEL, FRANCOIS |
分类号 |
H01J37/06;H01J3/02;H01J33/00;H01S3/097;(IPC1-7):H01J37/06 |
主分类号 |
H01J37/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|