Abstract: The present disclosure may provide a micro X-ray tube with a filter tube to filter X-rays and at the same time to serve as an insulator. For this, the X-ray tube may include a filter tube between a second electrode and a gate electrode, hence separating from each other. The second electrode may have a target and the gate electrode may accelerate an electron-beam to collide with the target. The filter tube includes an alumina (Al2O3). The target is inclined to allow the X-rays to be directed toward the filter tube.

Abstract: Provided herein is a field emission device. The field emission device includes a cathode which is connected to a negative power supply and emits electrons, an anode which is connected to a positive power supply and includes a target material receiving the electrons emitted from the cathode, and a ground electrode which is formed to face the anode and has an opening through which the electrons emitted from the cathode pass. The ground electrode is grounded so that when an arc discharge occurs due to high voltage operation of the anode, electric charge produced by the arc discharge is emitted to a ground.

Abstract: The present disclosure may provide a field emission device with an enhanced beam convergence. For this, the device may include a gate structure disposed between a cathode electrode and an anode electrode, wherein the gate structure includes a gate electrode and an atomic layer sheet disposed on the gate electrode, the gate electrode facing an emitter and having at least one aperture formed therein.

Abstract: A field emission device and a method of driving the multi-electrode field emission device having a single driving power source are disclosed. The field emission device includes a cathode electrode, one or more gate electrodes, a voltage division unit, and a power source unit. The cathode electrode is figured such that at least one emitter is formed thereon. The gate electrodes are disposed between an anode electrode and the cathode electrode, and each have one or more openings through which electrons emitted from the emitter can pass. The voltage division unit has one or more divider resistors, and divides a voltage applied from the power source unit using the divider resistors and then applies partial voltages to the one or more gate electrodes. The power source unit includes a single power source, and applies the voltage to the voltage division unit.

Abstract: Provided is an X-ray tube including an anode, a target on the anode, a cathode disposed separate from the target and the anode and comprising an emitter providing an electron beam to the target, and a side wall disposed between the cathode and the anode, and surrounding the target and the emitter. The side wall reflects a light generated by collision of the electron beam with the target to the cathode, and electrically insulates the cathode from the anode.

Abstract: Provided is a manufacturing method of a CNT emitter with density controlled CNT, comprising: (i) fabricating a CNT paste by dispersing a carbon nanotube (CNT) powder, two kinds or more of inorganic fillers which have a lower melting temperature than the CNT and different oxidation degrees of the CNT, and an organic binder in a solvent; (ii) coating the CNT paste on an electrode formed above a substrate; (iii) sintering the substrate coated with the CNT paste to selectively oxidize the CNT around one kind of inorganic filler among two kinds or more of the inorganic fillers; and (iv) treating the surface of the CNT paste so that the surface of the CNT paste is activated.

Abstract: An X-ray tube is provided. The X-ray tube includes a first housing including an X-ray window formed therein, a second housing being rotatable about a rotational shaft installed within the first housing, an anode installed on the rotational shaft within the second housing and positioned in one side of the rotational shaft in an extending direction of the rotational shaft, an emitter installed on the rotational shaft within the second housing, positioned in the other side of the rotational shaft in the extending direction of the rotational shaft, and emitting electron beams, a lens unit installed between the anode and the emitter and focusing the electron beams emitted from the emitter to the anode, and an electron beam deflection unit installed on the rotational shaft to deflect an angle of electron beams moving toward the anode from the lens unit.

Abstract: Provided is a field emission X-ray tube. The field emission X-ray tube includes a cathode electrode provided on one end of a vacuum container, including a field emission emitter; a gate electrode provided inside the vacuum container to be adjacent to the cathode electrode, including a first opening; a focusing electrode electrically connected to the gate electrode and provided on one surface of the gate electrode to be farther from the cathode electrode than the gate electrode while including a second opening with a greater width than that of the first opening; and an anode electrode provided inside the vacuum container on another end thereof in a direction where the vacuum container is extended. A height of the focusing electrode is identical to the width of the second opening, and wherein the width of the first opening is ? or less of the second opening.

Abstract: An X-ray tube is provided. The X-ray tube includes a cathode electrode which is disposed in one end of a vacuum container and includes an emitter emitting an electron; a gate electrode which is disposed in the vacuum container to be adjacent to the cathode electrode; an anode electrode which is disposed in the vacuum container of the other end of a direction in which the vacuum container extends and inclines with respect to the cathode electrode; and a focusing electrode which is disposed in the vacuum container along an inner circumference surface of the vacuum container between the gate electrode and the anode electrode. The focusing electrode has an opening of which a plan cross section has a maximum width and a minimum width different from each other.

Abstract: Provided is a method of driving multi electrical field emission devices. The method includes: respectively connecting first current control circuit devices for current path formation to a plurality of electric field emission devices; commonly connecting a second current control circuit device to the first current control circuit devices to commonly control the first current control circuit devices; and driving the first current control circuit devices at different timings when the second current control circuit device is driven.

Abstract: The present disclosure relates to a stacked x-ray tube apparatus using a spacer, and more particularly, to a stacked x-ray tube apparatus using a spacer that makes it possible to reduce the size of an x-ray tube by forming a stacked structure, with electric insulation and predetermined gaps maintained for each electrode, by forming a stacked x-ray tube by inserting insulating spacers (for example, ceramic) between a exhausting port, a cathode, a gate, a focusing electrode, and an anode and bonding them with an adhesive substance, and then inserting a spacer between a field emitter on a cathode substrate and a gate hole connected with a gate electrode.

Abstract: Provided are a field emission device and a method of manufacturing the same. The field emission device includes an anode electrode and a cathode electrode which are opposite to each other, a counter layer provided on the anode electrode, and a field emitter provided on the cathode electrode and facing the counter layer. Herein, the field emitter includes a carbon nanotube emitting cold electrons and a photoelectric material emitting photo electrons.

Abstract: The present disclosure relates to an electric field emission x-ray tube apparatus equipped with a built-in getter, and more particularly, to an electric field emission x-ray tube apparatus equipped with a built-in getter that makes it possible to reduce the size of an x-ray tube by forming a stacked structure, with electric insulation and predetermined gaps maintained for each electrode, by manufacturing an x-ray tube having a stacked structure by inserting insulating spacers (for example, ceramic) between an exhausting port, a cathode, a gate, a focusing electrode, and an anode and bonding them with an adhesive substance, and then inserting a spacer between a field emitter on a cathode substrate and a gate hole connected with a gate electrode.

Abstract: Provided is an X-ray tube. The X-ray tube includes an electrode on which an electron beam impacts to generate an X-ray, and a window on which the electrode is disposed and through which the X-ray generated from the electrode is transmitted. The electrode includes a channel passing through the electrode, and the electron beam is provided into the channel to generate the X-ray.

Abstract: The present disclosure relates to a field emission X-ray tube apparatus for facilitating cathode replacement, and more particularly, to a field emission X-ray tube apparatus for facilitating cathode replacement in which gates and cathodes are easily arranged through a joining member and a rotation preventing guide when gates and insulating spacers are rotated and joined with the cathodes while the cathodes and respective gates maintain electrical insulation, thereby easily replacing the cathodes.

Abstract: A method and apparatus for generating X-rays that can acquire an X-ray image of a subject at a high speed are provided. When a CT system checks a subject, the CT system can acquire an X-ray image of the subject through rotating X-rays that are emitted from the X-ray generating apparatus and thus an X-ray image of the subject can be obtained in various angles. Further, because it is unnecessary for the X-ray generating apparatus or the subject to move relative to each other, an X-ray image can be acquired at a high speed and thus a subject can be rapidly checked.

Abstract: A field emission device and a method of driving the multi-electrode field emission device having a single driving power source are disclosed. The field emission device includes a cathode electrode, one or more gate electrodes, a voltage division unit, and a power source unit. The cathode electrode is figured such that at least one emitter is formed thereon. The gate electrodes are disposed between an anode electrode and the cathode electrode, and each have one or more openings through which electrons emitted from the emitter can pass. The voltage division unit has one or more divider resistors, and divides a voltage applied from the power source unit using the divider resistors and then applies partial voltages to the one or more gate electrodes. The power source unit includes a single power source, and applies the voltage to the voltage division unit.

Abstract: Disclosed is a tomosynthesis system in which the maintenance is easily performed. The tomosynthesis system of the present disclosure includes a vacuum chamber, a plurality of X-ray sources configured to be coupled to the vacuum chamber so as to protrude from the vacuum chamber to generate X-rays in a direction of a subject, and an image sensor configured to detect an X-ray projection image that passes through the subject.

Abstract: Provided is a field emission X-ray tube. The field emission X-ray tube includes a cathode electrode provided to one end of a vacuum vessel and including a field emission emitter, an anode electrode provided to the other end of the vacuum vessel in an extending direction of the vacuum vessel, and a gate electrode provided on an outer surface of the vacuum vessel adjacent to the cathode electrode.

Abstract: An X-ray tube is provided. The X-ray tube includes a first housing including an X-ray window formed therein, a second housing being rotatable about a rotational shaft installed within the first housing, an anode installed on the rotational shaft within the second housing and positioned in one side of the rotational shaft in an extending direction of the rotational shaft, an emitter installed on the rotational shaft within the second housing, positioned in the other side of the rotational shaft in the extending direction of the rotational shaft, and emitting electron beams, a lens unit installed between the anode and the emitter and focusing the electron beams emitted from the emitter to the anode, and an electron beam deflection unit installed on the rotational shaft to deflect an angle of electron beams moving toward the anode from the lens unit.