| 摘要 |
<p>PURPOSE:To provide an electron beam source narrowing an energy width and further generating a stable electron flow even against a voltage fluctuation. CONSTITUTION:A plurality of layers of coating films 2, 3 are provided on a conductor 1 of a needle-shaped cathode, to apply voltage 6 to across the films and opposed anodes 5. In this way, a quantum well layer 3 and capacitor layers 2, 7 of energy barrier of interposing this layer 3 are formed in a cathode point end part, and a stable monochromatic electron beam is emitted by a resonance tunnel phenomenon through a quantum level 8.</p> |
