Abstract:
A vacuum electron tube comprises at least one electron-emitting cathode and at least one anode arranged in a vacuum chamber, the cathode having a planar structure comprising a substrate comprising a conductive material, a plurality of nanotube or nanowire elements electrically insulated from the substrate, the longitudinal axis of the nanotube or nanowire elements substantially parallel to the plane of the substrate, and at least one first connector electrically linked to at least one nanotube or nanowire element so as to be able to apply a first electrical potential to the nanowire or nanotube element.
Abstract:
An electronic device including a first conducting layer, a second conducting layer, and an insulating layer provided between the conducting layers. At least one side wall extends from the first conducting layer to the second conducting layer and includes at least a portion of the first conducting layer, the second conducting layer and the insulating layer. A bias voltage is applied between the first and second conducting layers, wherein responsive to the bias voltage, a two dimensional electron system is induced at least in one of the first conducting layer and the second conducting layer, and wherein electrons from the two dimensional electron system are emitted from the side wall side wall as a result of Coulombic repulsion and travel in air from the one of the first conducting layer and the second conducting layer to the other of the first conducting layer and the second conducting layer.
Abstract:
A method of making a field emitter includes following steps. A carbon nanotube layer is provided, and the carbon nanotube layer includes a first surface and a second surface opposite to each other. A carbon nanotube composite layer is formed via electroplating a first metal layer on the first surface and electroplating a second metal layer on the second surface. A first carbon nanotube layer and a second carbon nanotube layer is formed by separating apart the carbon nanotube composite layer, wherein a fracture surface is formed in the carbon nanotube composite layer, a number of first carbon nanotubes in the first carbon nanotube layer are exposed from the fracture surface, and a number of second carbon nanotubes in the second carbon nanotube layer are exposed from the fracture surface.
Abstract:
A field emission device may comprise: an emitter comprising a cathode electrode and an electron emission source supported by the cathode electrode; an insulating spacer around the emitter, the insulating spacer forming an opening that is a path of electrons emitted from the electron emission source; and/or a gate electrode comprising a graphene sheet covering the opening. A method of manufacturing a gate electrode may comprise: forming a graphene thin film on one surface of a conductive film; forming a mask layer having an etching opening on another surface of the conductive film, wherein the etching opening exposes a portion of the conductive film; partially removing the conductive film through the etching opening to partially expose the graphene thin film; and/or removing the mask layer.
Abstract:
A method for producing an electron-emitting device includes forming a first conductive film on a side surface of an insulation layer including the side surface and a top surface connected to the side surface; forming a second conductive film from the top surface to the side surface and on the first conductive film; and etching the second electrically conductive film.
Abstract:
A production method of an electron emitting device is provided, which reduces occurrence of a leak current between a gate and a cathode to which a voltage for driving an electron source is applied. The electron emitting device includes an insulating member having a concave portion on a surface thereof, a gate electrode formed on the insulating member and located opposing the concave portion, a cathode formed on an edge of the concave portion and having a protrusion protruding to the gate electrode. The production method includes steps of forming the concave portion and of forming the cathode after forming the convex portion protruding to the gate electrode at the edge of the concave portion. These steps are performed in this order.
Abstract:
A device includes a substrate, an insulating member disposed on a surface of the substrate, a gate, and a cathode. The insulating member has an upper surface apart from the surface of the substrate, and a side surface rising from the surface of the substrate between the upper surface and the surface of the substrate. The gate is disposed on the upper surface of the insulating member. The cathode is disposed on the side surface of the insulating member and has a portion opposing the gate. The side surface of the insulating member on which the cathode is disposed has a protruding portion protruding from an imaginary line connecting a position where the portion opposing the gate lies and a position where the insulating member rises from the surface of the substrate.
Abstract:
A method of manufacturing an electron-emitting device includes a first step of forming a conductive film on an insulating layer having an upper surface and a side surface connected to the upper surface via a corner portion so as to extend from the side surface to the upper surface and cover at least a part of the corner portion, and a second step of etching the conductive film. At the first step, the conductive film is formed so that film density of a portion on the side surface of the insulating layer becomes lower than film density of a portion on the corner portion of the insulating layer.
Abstract:
A method of manufacturing a field emission device having emitter shapes, comprise the steps of forming a first original plate having a major surface provided with emitter shapes, by cutting a surface portion of a base material, forming a first material layer on the major surface of the first original plate on which the emitter shapes are provided; separating the first material layer from the first original plate, thereby obtaining a second original plate having recesses onto which the emitter shapes on the first original plate are transferred, forming a second material layer on a major surface of the second original plate on which the recesses are provided; and separating the second material layer from the second original plate, thereby to obtain a substrate having projections portions onto which shapes of the recesses of the second original plate are transferred.
Abstract:
A method of operating and process for fabricating an electron source. A conductive rod is covered by an insulating layer, by dipping the rod in an insulation solution, for example. The rod is then covered by a field emitter material to form a layered conductive rod. The rod may also be covered by a second insulating material. Next, the materials are removed from the end of the rod and the insulating layers are recessed with respect to the field emitter layer so that a gap is present between the field emitter layer and the rod. The layered rod may be operated as an electron source within a vacuum tube by applying a positive bias to the rod with respect to the field emitter material and applying a higher positive bias to an anode opposite the rod in the tube. Electrons will accelerate to the charged anode and generate soft X-rays.