Electron-emitting device, electron source, image forming apparatus, and electron-emitting apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazushi Nomura
Life of this patent
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Abstract
Disclosed is an electron-emitting device, an electron source, and an image-forming apparatus that have uniform electron-emitting characteristics, emit electron beams whose diameters are small, have simple constructions, and are easy to be manufactured. The electron-emitting device comprising: a first electrode arranged on a surface of a substrate; an insulating layer arranged on the first electrode; a second electrode arranged on the insulating layer; and an electron-emitting film arranged on the second electrode, where the second electrode has two side surfaces that oppose each other in a direction parallel to the surface of the substrate, and the electron-emitting film is arranged so as to be shifted toward one of the two side surfaces.
Claims30
An electron-emitting apparatus comprising:
- an electron-emitting device including a first electrode, a second electrode that is provided so as to be insulated from the first electrode, and an electron-emitting film attached to the second electrode and insulated from the first electrode;
- and
- an anode provided at a predetermined distance from the electron-emitting film,
- wherein the first electrode, the second electrode, and the electron-emitting film oppose the anode,
- such that a distance between the anode and the electron-emitting film is longer than a distance between the anode and the second electrode, and
- a distance between the anode and the first electrode is longer than the distance between the anode and the electron-emitting film.
An electron-emitting device comprising:
- a first electrode arranged on a surface of a substrate;
- an insulating layer arranged on the first electrode;
- a second electrode arranged on the insulating layer;
- and
- a plurality of carbon fibers arranged on the second electrode,
- wherein each carbon fiber has a plurality of graphenes which are stacked so as not to be parallel to an axis direction of the fiber, and
- wherein the second electrode has two side surfaces that oppose each other in a direction substantially parallel to the surface of the substrate, and the plurality of carbon fibers are arranged so as to be shifted close to one of the two side surfaces.
An electron-emitting apparatus comprising:
- a first electrode arranged on a surface of a substrate;
- an insulating layer arranged on the first electrode;
- a second electrode arranged on the insulating layer;
- and
- a plurality of carbon fibers arranged on the second electrode;
- an anode disposed at a distance from the plurality of carbon fibers, the first electrode, the insulating layer, the second electrode and the substrate;
- a first power source for applying a necessary electric field, to cause an electron emission from the plurality of carbon fibers, at least between the anode and the second electrode;
- and
- a second power source for applying a necessary electric field, to stop the electron emission from the plurality of carbon fibers, between the first electrode and the second electrode.
An electron-emitting apparatus comprising:
- a substrate having a first electrode and a second electrode;
- an anode disposed at a distance from the substrate;
- an electron-emitting film, facing the anode, attached to a surface of the second electrode;
- a first power source for applying a necessary electric field, to cause an electron emission from the electron-emitting film, at least between the anode and the second electrode;
- and
- a second power source for applying a necessary electric field, to stop the electron emission from the electron-emitting film, between the first electrode and the second electrode,
- wherein a distance between the first electrode and the anode is larger than a distance between the second electrode and the anode.
An electron-emitting device comprising:
- a first electrode arranged on a surface of a substrate;
- an insulating layer arranged on the first electrode;
- a second electrode arranged on the insulating layer;
- and
- a plurality of carbon fibers arranged on the second electrode,
- wherein each carbon fiber comprises a plurality of graphenes stacked in a direction that is not perpendicular to an axis direction of the fiber, and
- wherein the plurality of carbon fibers are arranged on the second electrode so that the plurality of carbon fibers are close to a part of an outer periphery of the second electrode.
Dependencies are inferred from the claim text.