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    • 4. 发明专利
    • Electron irradiation apparatus
    • JP3950593B2
    • 2007-08-01
    • JP24814299
    • 1999-09-02
    • 日本電子株式会社
    • 政都 工藤
    • H01J37/063H01J37/20G01N23/227
    • PROBLEM TO BE SOLVED: To radiate a large quantity of low-energy electrons to a sample at uniform density by arranging an earth electrode protrusively from an extracting electrode on the outside of the extracting electrode, so that the electrons extracted by the extraction electrode are decelerated to reach the sample by the electric field formed in cooperation with the extraction electrode. SOLUTION: A filament 2 arranged around a grid 1 is excited and heated, and the thermoelectrons generated from the filament 2 are accelerated toward the grid 1. Since a repeller electrode 3 having the same potential as that of the filament 2 is arranged on the outside of the filament 2, the electrons passing through the grid 1 are again pushed back to the grid 1 side, thereby the space with a high electron density is formed in the cylindrical grid 1 to serve as an electron source. An electron beam from the electron source is generated by extracting the electrons existing in the grid 1 with the electric field formed by the extraction electrode 4, repeller electrode 3, and the grid 1.