| 摘要 |
PURPOSE:To prevent the deterioration in the electric field intensity applied to the tip of an emitter by a heat reflecting tube and improve the ion generation efficiency by applying the potential different from an extracting electrode to the heat reflecting tube. CONSTITUTION:The extracting voltage of 30KV is applied across an emitter 1 to generate ions and an extracting electrode 6, and the auxiliary voltage of about 20KV is applied across the emitter 1 and a heat reflecting tube 12. Thereby, a potential difference of 10KV exists between the extracting electrode 6 and the heat reflecting tube 12, thus the electric field formed between the emitter 1 and the extracting electrode 6 enters deeply to the emitter 1 side. Accordingly, the electric field strength applied to the tip of the emitter 1 is not weakened by the heat reflecting tube 12, thus the ion generation efficiency can be improved.
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