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    • 76. 发明专利
    • DEVICE FOR IRRADIATING CHARGED PARTICLES
    • JPS61165941A
    • 1986-07-26
    • JP641086
    • 1986-01-17
    • HITACHI LTD
    • TAMURA HIFUMIISHITANI SUSUMUSHIMASE AKIRA
    • H01J37/252H01J37/141H01J37/145H01J37/147
    • PURPOSE:To enable the focal distances of an electron beam and an ion beam to be arbitrarity varied by using a charged particle source from which both the electron beam and the ion beam can be produced and appropriately reducing the diameters of these beams by the combination of electrostatic lenses and magnetic field lenses. CONSTITUTION:A scanning electron microscope-secondary ion mass spectrography complex device or a similar device includes a charged particle source 1 for simultaneously producing electrons and ions, electrostatic lenses 3 and 8, magnetic field lenses 4 and 9, a diaphragm 7 and a deflecting electrode 10. An ion beam 6 is focused by a two-step lens system consisting of electrostatic lenses 3 and 8 without being influenced by the lens effect of the magnetic field lenses 4 and 9. The diameter of the electron beam is reduced to a very small level by a complex four-step lens system consisting of the lenses 3, 4, 8 and 9. Secondary electrons 16 are detected and the detection result is displayed on a CRT 15. Secondary ions 17 are analyzed by a mass spectrometer 18. Accordingly, it is possible to irradiate both the ion beam 6 and the electron beam upon a sample 11 by the combination of the electrostatic and the magnetic field lenses.