Abstract:
PROBLEM TO BE SOLVED: To provide an electronic discharge hot-cathode with a prolonged product life.SOLUTION: A hot-cathode includes: a crystal emitter or a sinter emitter having an emitter upper part 20 and an emitter main part 30; and a carbon coating part having a lower side coating part 42 and an upper side coating part 41. The lower side coating part 42 is coated with a carbon material on the outer circumference of the emitter main body side surface. The upper side coating part 41, formed continuously from the lower side coating part, surrounds the emitter upper part with a clearance.
Abstract:
Provided are an electron source which allows a high-angle current density operation even at a low extraction voltage, and reduces excess current that causes vacuum deterioration; and an electronic device using the electron source. The electron source has a cathode composed of single-crystal tungsten, and a diffusion source provided in the intermediate portion of the cathode. In the cathode, the angle between the axial direction of the cathode and orientation of the cathode is adjusted so that electrons to be emitted from the vicinity of the boundary between (100) surface and (110) surface formed on the tip of the cathode, are emitted substantially parallel to the axis of the cathode. The electronic device is provided with the electron source. The electron source has a cathode composed of single-crystal tungsten, wherein the angle between the axial direction of the cathode and orientation of the cathode is adjusted so that electrons to be emitted from the vicinity of the boundary between (100) surface and (110) surface formed on the tip of the cathode, are emitted substantially parallel to the axis of the cathode; and a diffusion source provided in the intermediate portion of the cathode.