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公开(公告)号：US11621139B2
公开(公告)日：2023-04-04
申请号：US17523080
申请日：2021-11-10
Inventor： Jin-Woo Jeong
Abstract: An X-ray tube according to an embodiment of the inventive concept includes a cathode structure; an anode structure spaced vertically from the cathode structure, a gate electrode structure disposed between the cathode structure and the anode structure, an emitter array disposed between the cathode structure and the gate electrode structure, a tube sheath configured to connect the cathode structure and the anode structure, and a fixing unit connected with the gate electrode structure. The cathode structure includes a first rotation shaft and a cathode connected with the first rotation shaft as one body. The gate electrode structure includes a second rotation shaft and a gate electrode connected with the second rotation shaft through a bearing, and the second rotation shaft is connected with the first rotation shaft by a coupling unit. The gate electrode includes a gate electrode substrate and a protruding part that protrudes from the gate electrode substrate toward an emitter. The protruding part of the gate electrode includes a gate hole that vertically overlaps the emitter. The fixing unit includes a ferromagnetic structure attached to one surface of the gate electrode substrate and disposed on an outer portion of the substrate and a permanent magnet disposed adjacent to the ferromagnetic structure with the tube sheath therebetween.
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公开(公告)号：US10804062B2
公开(公告)日：2020-10-13
申请号：US16777547
申请日：2020-01-30
Inventor： Jin-Woo Jeong
Abstract: Provided is a field emission device. The field emission device includes a cathode electrode having a first surface and a second surface facing the first surface, the cathode electrode including grooves that are recessed from the first surface toward the second surface, the grooves extending in a first direction parallel to the first surface and emitter structures which are disposed within the grooves and each of which includes a core extending in the first direction and a conductive wire configured to surround the core. The grooves may be arranged in a second direction crossing the first direction, and the emitter structures may be disposed at vertical levels different from each other.
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公开(公告)号：US11791123B2
公开(公告)日：2023-10-17
申请号：US17712639
申请日：2022-04-04
Inventor： Yoon-Ho Song , Jun-Tae Kang , Jae-Woo Kim , Jin-Woo Jeong
CPC classification number: H01J35/16 , H01J35/045 , H01J35/064
Abstract: Provided is an X-ray tube which includes a first electrode, a second electrode spaced apart from the first electrode, a target disposed in a lower portion of the second electrode, an emitter on the first electrode, a third electrode which is positioned between the first electrode and the second electrode and includes an opening at a position perpendicularly corresponding to the emitter, and a spacer provided on the third electrode and surrounding the second electrode. The spacer includes a first section located adjacent to the third electrode and a second section disposed on the first section. The spacer includes a ceramic insulator and conductive dopants dispersed within the ceramic insulator. A concentration of the conductive dopants in the first section of the spacer is greater than a concentration of the conductive dopants in the second section. The third electrode is in contact with the first section of the spacer.
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公开(公告)号：US20230036147A1
公开(公告)日：2023-02-02
申请号：US17872782
申请日：2022-07-25
Inventor： Yoon-Ho SONG , Jun-Tae Kang , Jae-Woo Kim , Sora Park , Jin-Woo Jeong
Abstract: Provided is an X-ray tube including a cathode structure, an anode spaced apart from the cathode structure, a spacer structure disposed between the cathode structure and the anode, and an external power supply connected to each of the cathode structure, the anode, and the spacer structure. Here, the spacer structure includes a first spacer disposed adjacent to the cathode structure and a second spacer disposed on the first spacer and disposed adjacent to the anode. The first spacer includes a first portion adjacent to the cathode structure and a second portion adjacent to a contact point of the first spacer and the second spacer. The second spacer includes a third portion adjacent to the contact point and a fourth portion adjacent to the anode. Each of the first portion and the third portion has a volume resistivity less than that of the second portion.
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公开(公告)号：US10600605B2
公开(公告)日：2020-03-24
申请号：US16123540
申请日：2018-09-06
Inventor： Jin-Woo Jeong , Yoon-Ho Song
Abstract: The inventive concept relates to an apparatus for aging a field emission device configured to emitting electrons based on an electric field between a first electrode and a second electrode, and an aging method thereof. The apparatus according to an embodiment of an inventive concept includes a voltage generator and a current controller. The voltage generator increases the voltage applied to the first electrode to the target voltage level during the first time. The current controller increases the field emission current for the second time to the target current level and increases the pulse width of the field emission current for the third time to the target pulse width. According to the inventive concept, the performance of a large field emission device may be improved with high efficiency and low cost.
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Patent Agency Ranking
公开(公告)号：US10438764B2
公开(公告)日：2019-10-08
申请号：US15835073
申请日：2017-12-07
Inventor： Young Chul Choi , Yoon-Ho Song , Hyo Jin Jeon , Jun Tae Kang , Sora Park , Jeong Woong Lee , Eunsol Go , Min-Sik Shin , Jae-Woo Kim , Jin-Woo Jeong , Ji-Hwan Yeon , Sunghee Kim
Abstract: Disclosed is a field emission apparatus. The apparatus comprises a cathode electrode and an anode electrode spaced apart from each other, an emitter on the cathode electrode, a gate electrode between the cathode and anode electrodes and including at least one gate aperture overlapping the emitter, and an electron transmissive sheet on the gate electrode and including a plurality of fine openings overlapping the gate aperture.
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公开(公告)号：US10283311B2
公开(公告)日：2019-05-07
申请号：US15230276
申请日：2016-08-05
Inventor： Jin-Woo Jeong , Yoon-Ho Song
IPC: H01J37/065 , H01J35/06 , H01J35/04 , H01J35/16
Abstract: Disclosed is an X-ray source, including: a cathode; an anode positioned on the cathode so as to face the cathode; emitters formed on the cathode; a gate electrode positioned between the cathode and the anode and including openings at positions corresponding to those of the emitters; an insulating spacer formed between the gate and the anode; and a coating layer formed on an internal wall of the insulating spacer, and including a material having a lower secondary electron emission coefficient than that of the insulating spacer.
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公开(公告)号：US11538651B2
公开(公告)日：2022-12-27
申请号：US17562801
申请日：2021-12-27
Inventor： Ki Nam Yun , Yoon-Ho Song , Jun-Tae Kang , Jeong-Woong Lee , Jin-Woo Jeong
Abstract: Provided is a method for manufacturing an electric field emission device. The method for manufacturing the electric field emission device includes winding a carbon nanotube yarn around outer circumferential surfaces of a metal plate in a first direction, pressing both side surfaces of the metal plate through a pair of metal structures, wherein a top surface of the metal plate is exposed from the metal structures, and an area of the top surface of the metal plate is less than that of each of both the side surfaces of the metal plate, and cutting the carbon nanotube yarn at an edge portion of the top surface of the metal plate in the first direction to form a plurality of emitters.
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公开(公告)号：US10910190B2
公开(公告)日：2021-02-02
申请号：US16734632
申请日：2020-01-06
Inventor： Jin-Woo Jeong
Abstract: An embodiment of the inventive concept provides an X-ray tube including a chamber having a hollow pillar shape using a first axis as a central axis, a cathode electrode disposed on a bottom surface of the chamber, an emitter provided at a position at which the cathode electrode meets the first axis, an anode electrode including a through-hole using the first axis as a central axis and a target layer inclined to the first axis, a gate electrode disposed between the cathode electrode and the anode electrode and having an opening exposing the emitter, a focusing electrode disposed between the gate electrode and the anode electrode, a window spaced apart from the target layer of the anode electrode, and a window electrode provided on a top surface of the chamber to fix a side surface of the window. Here, the window electrode is grounded.
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公开(公告)号：US10381189B2
公开(公告)日：2019-08-13
申请号：US15414455
申请日：2017-01-24
Inventor： Jin-Woo Jeong , Yoon-Ho Song
Abstract: The present disclosure relates to an X-ray tube, and more particularly, to an X-ray tube having a simple structure from which an element necessary for focusing an electron beam, such as a magnetic lens, and having generating an X-ray having a focal spot of a nanometer-scale. The present disclosure includes: a electron beam generation unit emitting an electron beam; a limiting electrode unit limiting the electron beam emitted from the electron beam generation unit; and a target unit including a target material emitting an X-ray when the limited electron beam collides with the target material, wherein the limiting electrode includes of an electron beam limiting electrode allowing a portion of the emitted electron beam to pass therethrough and to be delivered to the target unit.
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