| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a reduced size of a magnetic path and stable behavior of an electron gun in a double-gap magnetic field immersion type electron gun. <P>SOLUTION: The magnetic field immersion type electron gun has a double-gap magnetic path with three magnetic poles arranged on a coaxial line in which a magnetic lens has a hole in its central axis, wherein a permanent magnet is arranged in a gap of two gaps made up among the three magnetic poles, the gap on the side where there exists no electron source. <P>COPYRIGHT: (C)2011,JPO&INPIT |
