| 摘要 |
PROBLEM TO BE SOLVED: To provide an electron beam tube equipped with a long lifetime by preventing breakage of the peripheral part (rim) of a thin film part of a window member. SOLUTION: The electron beam tube is equipped with a tubing 5 furnished internally with an electron beam generator 4, a lid 6 installed in such a way as covering the opening of the tubing 5 and having an aperture 7 to admit passage of an electron beam, and a window member 8 sealing the aperture 7 and having an electron beam emitting window part 81 consisting of a thin film formed by an etching process, wherein a shielding means 61 is installed between the beam generator 4 and the window member 8 so that the electron beam emitted from the beam generator 4 is not incident to the edge 83 of the window part 81. COPYRIGHT: (C)2003,JPO
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