15results about "X-ray tube cold cathodes" patented technology

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.

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.

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.

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.

An X-ray tube includes a tube body that encloses a tube volume in a gas-tight manner. An emitter electrode, a gate electrode, and an anode are arranged within the tube volume. The emitter electrode is an unheated electrode having emitter needles in an area facing the gate electrode, which are themselves arranged on a substrate. The arrangement of the emitter electrode and the gate electrode are coordinated such that applying an emission voltage between the emitter electrode and the gate electrode causes electrons to be emitted from the multitude of emitter needles due to the resulting electrical field. The gate electrode is connected with thermal conductivity via a connecting element to a heat sink arranged outside the tube volume.

This invention relates to cathode devices and X-ray sources. A cathode device for an X-ray source according to the invention comprises: - an electron emitter; and - an emitter holder, wherein the electron emitter comprises: - a plurality of parallel-oriented field-effect emitter elements constituting an emitting surface, - a gate electrode disposed above the emitting surface, - and a plurality of first contact elements, characterized in that: - the emitter holder has a plurality of second contact elements, the second contact elements being connectable to the plurality of first contact elements to close a current path, - the plurality of first contact elements being disposed on the side of the plurality of parallel-oriented field-effect emitter elements opposite to the emitting surface.

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.

A chip mounted field emitter array method for their fabrication by applying sintering to bind a substrate die to other die layers. Metal powder is applied to the bonding surface of the die, covered with the chip carrier or chip and compressed between two heated plates. The bonding pads of the die may be conductively coupled to corresponding bonding pads of the other die layers.

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.

X-ray systems, X-ray sources, field emitters, and structures for supporting and providing electrical connections to field emitters are disclosed. An apparatus can include a support substrate, a field emitter device disposed on the support substrate, a conductive plate, and a clamp coupled to the support substrate and the conductive plate. The field emitter device can include a gate and a contact electrically connected to the gate. The conductive plate can include an opening such that the conductive plate is electrically connected to the contact of the field emitter device at the opening. The conductive plate can electrically connect to the contact of the field emitter device.

The present invention relates to a method for preparing a high-density carbon structure-based thin film, comprising the steps of: providing a carbon structure-based thin film; a step for obtaining a high-density carbon structure-based thin film, in which the carbon structure-based thin film is immersed in a polar solvent and then immersed in an acidic aqueous solution to obtain a high-density carbon structure-based thin film; or dipping the carbon structure-based thin film into an acidic aqueous solution, and then dipping into a polar solvent to obtain the high-density carbon structure-based thin film.