整体铁心磁桥连接主极的后极尖和相邻的不带线圈的横轴磁极；
Solid iron flux bridges are inserted between the lagging tips of the main poles and the adjacent auxiliary poles without windings.
测试结果表明，沉积六硼化镧薄膜后的二极管发射性能与纯硅尖相比具有明显增强。
The results show that thin film with deposition of LaB6 in the diode can markedly improve the emission properties compared with pure silicon tip.
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