94results about "X-ray tube cold cathodes" patented technology

The invention relates to a field effect emitter microstructure, an electron emitter device, an X-ray tube and a method for generating X-rays by means of an X-ray tube. The field effect emitter microstructure comprises an emitter needle, a gate electrode with a gate opening, the gate opening connects the lower side and the upper side of the gate electrode, and the longitudinal central axis of the emitter needle is vertical to the gate electrode in the emission direction and is aligned with the gate opening; a first insulating layer in which free electrons can be generated by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section, the field-effect emitter microstructure being characterized in that a second insulating layer, the lower side of which adjoins the upper side of the gate electrode at least in part, is provided, and an electrically conductive focusing layer, the focusing layer being provided in which the free electrons can be generated in the field-effect emission section by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section. The upper side of the second insulating layer is at least partially adjacent to the lower side of the focusing layer, and the second insulating layer and the focusing layer each have a through-opening for free electrons that can be generated in the field-effect emission section.

Provided is an emitter. The emitter according to an aspect of the present disclosure is formed in a form of a sheet including carbon nanotube, and the emitter includes at least one of a part curved to form a ridge in a direction of electron emission and a part bent to form a ridge in the direction of electron emission.

The present invention provides a multi-directional connection hub including a plurality of openings to which an anode adapter made of a metal material is connected through an insulation tube and an electron gun which emits electrons to the anode adapter to generate X-rays is connected, wherein the openings include a plurality of side openings to which the electron gun is connected and an upper opening through which the X-rays generated by the electrons, which are provided from the electron gun through the side opening and collide with the anode adapter, are emitted, and an emission direction of the X-rays is changed toward another side opening of the plurality of side openings or the upper opening according to a type of the anode adapter and a type or installation location of the electron gun.

One or more example embodiments relates to a cathode device and an X-ray source. The cathode device for an X-ray source has an electron emitter including a plurality of field effect emitter elements aligned in parallel to form an emission surface on the upper side of the plurality of field effect emitter elements aligned in parallel a gate electrode, arranged above the emission surface, a multiple first contact elements for at least two independently current-carrying current paths of the electron emitter, electrons from at least one of the current paths are emittable depending on an emission voltage between the gate electrode and the emission surface via the field effect emitter elements; and an emitter seat including multiple second contact elements, the multiple second contact elements connectable with the multiple first contact elements for closing the current paths.

The present disclosure relates to an X-ray generating apparatus capable of providing an X-ray image and an X-ray system using the same, including: a field emitting part having a plurality of electron beam emitting regions arranged; an X-ray generating part generating X-rays by collision with electrons emitted from the field emitting part; and, a collimator transmitting X-rays generated from the X-ray generating part in a specific direction, in which a plurality of through-holes are arranged on the collimator to transmit the X-rays in a specific direction, and the X-ray can be blocked in a region other than the through-hole.

The invention relates to an electron emitter for a rotary piston X-ray tube, a cathode for a rotary piston X-ray tube, a rotary piston X-ray tube, a rotary piston X-ray source, a method for emitting electrons by means of an electron emitter, and an associated computer program. The electron emitter according to the invention for a rotary piston X-ray tube has a segmented emitter surface, wherein the segmented emitter surface has a plurality of emitter needles and is configured to activate a subset of the segments of the segmented emitter surface as an activated emission surface for the field-effect emission of electrons from the activated emission surface such that activated emission surfaces can be rotated pairwise about a pivot point by changing the subset.

One or more example embodiments relates to an X-ray source comprising a grid voltage unit including an interface configured to receive a control signal. The grid voltage unit is configured to regulate, via regulation of a first grid voltage at a first grid and via regulation of a second grid voltage at a second grid, a charge quantity available in a capacitor and a generator current as a function of the control signal.

The present invention provides an X-ray source comprising: an anode electrode on which a target is formed; a tubular-shaped first housing which is made of an insulating material and at one end of which the anode electrode is provided; a tubular-shaped second housing which is made of a conductive material and one end of which is connected to the first housing; and a cathode electrode which is provided at the other end of the second housing and has an emitter formed opposite to the target.

The invention relates to a rotary piston X-ray emitter. The rotary piston X-ray emitter according to the invention has - a case, - a rotary piston X-ray tube and - a distraction unit, wherein the rotary piston X-ray tube is mounted inside the housing around a rotational axis with a rotational frequency relative to the housing, wherein the rotary piston X-ray tube has a cathode, a rotary piston and an anode, wherein the anode is connected to the rotary piston in a rotationally fixed manner, wherein the cathode is arranged inside the rotary piston on the axis of rotation, characterized in that the deflection unit is set up to generate an inhomogeneous field between the cathode and the anode inside the rotary piston, wherein the inhomogeneous field influences the emitted electrons on their different paths towards the anode and is designed in such a way that path length differences of the emitted electrons along the different paths within the inhomogeneous field are taken into account.

A device and method for creating beam formed X-Ray radiation using radio frequency (RF) modulated field emission X-ray sources is described. A radio frequency RF source generates a RF control signal which is supplied to an array of phase delay elements to generate multiple individually controlled phase delayed RF signals. These are then directly provided to each of a plurality of field emission sources (via a matching circuit) to generate a plurality of RF modulated electron current, or beam, each at the same frequency and phase delay of the phase delayed RF signals. Each of the electron beams impacts a target anode to generate X-rays also at the same frequency and phase delay of the phase delayed RF signals. By controlling each of the phase delay elements a beamformed X-ray radiation pattern can be generated.

The present application provides a functionalized carbon nanocone tip, the front end of a tip base being modified by a carbon nanocone. The carbon nanocone is a cone-shaped nanocarbon material composed of a layered graphite structure; the tip base is made of metal selected from one or more of tungsten, iron, cobalt, nickel, and titanium; and the carbon nanocone has a tail end connected to the interface of the tip base on which a covalent bond is formed, and a tip end in an orientation consistent with the orientation of the central axis of the whole tip. The present application also provides a preparation method for the functionalized carbon nanocone tip. In the present application, the orientation of the carbon nanocone tip end coincides with the orientation of the central axis of the whole tip, thereby ensuring the controllability of an active emission site of the carbon nanocone tip during electron emission. The prepared functionalized carbon nanocone tip has a carbon nanocone tip end with a clean and complete layered graphite structure. The structure feature of the tip prevents damages or even failure of the tip structure caused by electron emission noise and uncontrollable emission current due to the contamination on the tip end surface.

The current stability of a field emission electron source and a Schottky electron source where a {100} plane of a hexaboride single crystal is used as an electron emission surface is improved. The electron source includes a tip of a hexaboride single crystal with a <100> axis, in which a top facet of a {100} plane that is surrounded by side facets including at least four {n11} planes and at least four {n10} planes where n represents an integer of 1, 2, or 3 is formed at a front end of the tip of the hexaboride single crystal, and a total area of the side facets of the {n11} planes is more than a total area of the side facets of the {n10} planes.

The present disclosure relates to a field emission device that generates X-rays by emitting an electron beam, and an X-ray generating apparatus using the same, including a semiconductor substrate; a bottom electrode disposed below the semiconductor substrate; an insulating layer disposed above the semiconductor substrate; a gate electrode disposed on the insulating layer; and, a top electrode disposed on the gate electrode; wherein the gate electrode is composed of a material satisfying at least one of a first condition for work function, a second condition for Gibbs free energy of a redox reaction with the insulating layer, a third condition for sublimation energy, and a fourth condition for electron mean free path.

A production method for producing an anode for a cold cathode X-ray source, including the following steps: producing an element referred to as target from a first material adapted to generating X-rays from the absorption of an electron beam, the first material having a first thermal expansion coefficient Ce,1(Tu) at a predetermined temperature Tu of use of the anode in the X-ray source, producing an element referred to as target support from a second material having a second thermal expansion coefficient Ce,2(Tu) at the predetermined temperature Tu, joining the target to the target support by hard soldering using a solder material at a soldering temperature higher than the predetermined temperature Tu and higher than a melting point of the solder material, so as to form a film of solder interposed between the target and the target support.

The present invention relates to an X-ray electron emission control device which senses anode current and controls the anode current at a constant level, the device comprising: an electron emission unit which emits electrons; an anode which collects the electrons; a gate voltage source connected to a gate of the electron emission unit; a cathode current source connected to a cathode of the electron emission unit; a current sensing unit which is connected to the cathode current source and senses the anode current; and a current control unit which generates a current control signal on the basis of the sensed anode current and outputs same to the cathode current source. One side of the gate voltage source may be connected to the gate of the electron emission unit, and the other side may be connected to a branch point of a line connecting the cathode current source and the current sensing unit.

Some embodiments include a method comprising: providing a substrate, the substrate comprising a nanotube layer, the nanotube layer comprising nanotubes; the nanotube layer is heated; and destroying at least a portion of the nanotube layer by heating such that the nanotubes in the at least a portion of the nanotube layer are activated for electron emission. Other embodiments include an X-ray device including a substrate including nanotubes formed by the method.

Some embodiments include an x-ray source, comprising: an anode; a field emitter configured to generate an electron beam; a first grid configured to control field emission from the field emitter; a second grid disposed between the first grid and the anode; a third grid disposed between the first grid and the anode; and a middle electrode disposed between the first grid and the anode wherein the second grid is either disposed between the first grid and middle electrode or between the middle electrode and the anode; wherein the third grid is a mesh grid.

Proposed is a field emission X-ray source device including an insulating housing, an anode electrode, a cathode electrode, a gate electrode, an electronic emitter, and a target. The insulating housing extends in a tube shape. The anode electrode covers a first side of the insulating housing. The cathode electrode is placed at a second side of the insulating housing and faces the anode electrode. The gate electrode covers the second side of the insulating housing, and has an opening formed in the direction of the second side. The electronic emitter is provided on the cathode electrode and is configured to emit an electron beam toward the anode electrode. The target is provided on the anode electrode and is placed to face the electronic emitter, and enables X-rays to be generated by collision with the electron beam.

Electron source (2) for generating an electron beam (8) with a cathode (1) and an anode (4) arranged on the same silicon carbide substrate (5), wherein the cathode (1) has a graphene layer (12) arranged directly on the same substrate (5), characterized in that the electron source (2) has an acceleration section between the cathode and the anode to extract electrons from the cathode due to an electrical potential difference between the cathode and the anode and to accelerate them from the cathode towards the anode, wherein the potential difference is greater than 1 kV.

To provide a field emission X-ray source device.SOLUTION: A field emission X-ray source device comprises: an insulating housing extending in a tube shape; an anode electrode covering one side of the insulating housing; a cathode electrode placed at the other side of the insulating housing and facing the anode electrode; a gate electrode covering the other side of the insulating housing and having an opening formed in the direction of the other side; an electronic emitter provided on the cathode electrode and configured to emit an electron beam toward the anode electrode; and a target which is provided on the anode electrode and placed to face the electronic emitter, and enables X-rays to be generated by collision with the electron beam.SELECTED DRAWING: Figure 2

The present disclosure relates to an X-ray generating apparatus capable of providing an X-ray image and an X-ray system using the same, including: a field emitting part having a plurality of electron beam emitting regions arranged; an X-ray generating part generating X-rays by collision with electrons emitted from the field emitting part; and, a collimator transmitting X-rays generated from the X-ray generating part in a specific direction, in which a plurality of through-holes are arranged on the collimator to transmit the X-rays in a specific direction, and the X-ray can be blocked in a region other than the through-hole.

The invention relates to a cathode device and an X-ray source. The cathode device according to the invention for an X-ray source has - an electron emitter and - an emitter seat, where the electron emitter - a plurality of parallel aligned field effect emitter elements to form an emission surface, - a gate electrode arranged above the emission surface, - and has a plurality of first contact elements, characterized by - that the emitter seat has a plurality of second contact elements which can be connected to the plurality of first contact elements at the end of the current paths, - that the plurality of first contact elements are arranged on a side of the plurality of parallel aligned field effect emitter elements facing away from the emission surface.

The invention relates to a silicon field effect emitter. The invention relates to an X-ray tube, an X-ray apparatus, a method for generating X-ray radiation with a predefined spatial distribution on an anode, and a related computer program product. The X-ray tube according to the invention has: - an anode, - a first switching device, - a second switching device, - a control unit, and - an emitter with a plurality of field effect emitter needles, wherein at least one of the plurality of field effect emitter needles has a diameter of less than 1 pm and is made of silicon, wherein a first group of the plurality of field effect emitter needles can be switched on or off by means of the first switching device, wherein a second group of the plurality of field effect emitter needles can be switched on or off by means of the second switching device, wherein the first group is different from the second group, and wherein the control unit is configured to control the first switching device and the second switching device.

The present application relates to a method for manufacturing a densified carbon structure-based film, the method comprising: a step for providing a carbon structure-based film; and a carbon structure-based film densification step for obtaining a densified carbon structure-based film by immersing the carbon structure-based film in a polar solvent and then in an acidic aqueous solution, or obtaining a densified carbon structure-based film by immersing the carbon structure-based film in an acidic aqueous solution and then in a polar solvent.

The present invention relates to large area field emission devices based on the addition of macroscopic, microscopic and nanoscale field enhancement features and designed forced current sharing matrix layers to achieve stable high current density long life field emission devices. The present invention relates to a wide range of field emission sources and is not limited to a specific field emission technology. The present invention is described as an X-ray electron source, but can be applied to any application requiring a high current density electron source.

A field effect emitter microstructure comprises: an emitter needle having a field effect emitter portion on a first end; a gate electrode with a gate opening connecting an underside of the gate electrode facing the emitter needle to an upper side of the gate electrode facing away from the underside, wherein a central axis of the emitter needle is perpendicular to the gate electrode toward the gate opening in the emitting direction; and a first insulating layer adjoining the emitter needle under the field effect emitter portion and at least partially adjoining the gate electrode underside. An emission voltage is applied to produce free electrons in the field effect emitter portion. The first end of the emitter needle has a protrusion greater than or equal to zero relative to the gate electrode upper side and / or the first insulating layer adjoins the inner wall of the gate opening.

The present invention provides an X-ray source including: an anode electrode having a target; a tube-shaped first housing made of an insulating material and having the anode electrode installed at one end; a tube-shaped second housing made of a conductive material and having one end connected to the first housing; and a cathode electrode having an emitter installed at the other end of the second housing and facing the target.

One or more example embodiments relates to a cathode device and an X-ray source. The cathode device for an X-ray source has an electron emitter including a plurality of field effect emitter elements aligned in parallel to form an emission surface on the upper side of the plurality of field effect emitter elements aligned in parallel a gate electrode, arranged above the emission surface, a multiple first contact elements for at least two independently current-carrying current paths of the electron emitter, electrons from at least one of the current paths are emittable depending on an emission voltage between the gate electrode and the emission surface via the field effect emitter elements; and an emitter seat including multiple second contact elements, the multiple second contact elements connectable with the multiple first contact elements for closing the current paths.

The invention relates to an electron emitter for a rotary piston X-ray tube, a cathode for a rotary piston X-ray tube, a rotary piston X-ray tube, a rotary piston X-ray emitter, a method for emitting electrons by means of an electron emitter and an associated computer program product. The electron emitter according to the invention for a rotary piston X-ray tube has a segmented emitter surface, wherein the segmented emitter surface has a plurality of emitter needles and is configured to activate a subset of the segments of the segmented emitter surface as an activated emission surface for field-effect emission of electrons from the activated emission surface in such a way that activated emission surfaces can be rotated pairwise about a pivot point by changing the subset.

Apparatuses and methods for prolonging longevity of cold cathode X-ray emission tubes by reducing a leakage current between a gate electrode and a cathode electrode of an electron emitter array chip. Sputterproofing elements, such as barrier notches within cavity walls or isolation layers of insulating materials encapsulating cavity walls and the gate electrode, prevent a conductive path forming on interlevel dielectric layer (ILD) cavity walls over time due to deposition of conducting material sputtered from the emitter tips upon the ILD wall surface.