公开(公告)号：US11798772B2

公开(公告)日：2023-10-24

申请号：US17292695

申请日：2019-11-07

Applicant: PEKING UNIVERSITY

Inventor： Xianlong Wei

IPC: H01J35/02 ,  H01J35/14 ,  H01J9/18 ,  H01J35/12 ,  H01J35/16 ,  H01J35/18 ,  H01J35/06

CPC classification number: H01J35/025 ,  H01J35/064 ,  H01J35/16 ,  H01J35/186 ,  H01J9/18 ,  H01J35/12 ,  H01J35/147 ,  H01J2235/068

Abstract: Provided are an on-chip miniature X-ray source and a method for manufacturing the same. The on-chip miniature X-ray source includes: an on-chip miniature electron source; a first insulating spacer provided on an electron-emitting side of the on-chip miniature electron source, where the first insulating spacer has a cavity structure; and an anode provided on the first insulating spacer, where a closed vacuum cavity is formed between the on-chip miniature electron source and the anode. The on-chip miniature X-ray source has the advantages of stable X-ray dose, low working requirements for vacuum, fast switch response, capability of integration and batch fabrication, and can be used in various types of small and portable X-ray detection, analysis and treatment devices.

公开(公告)号：US11791123B2

公开(公告)日：2023-10-17

申请号：US17712639

申请日：2022-04-04

Applicant: Electronics and Telecommunications Research Institute

Inventor： Yoon-Ho Song ,  Jun-Tae Kang ,  Jae-Woo Kim ,  Jin-Woo Jeong

IPC: H01J35/16 ,  H01J35/06 ,  H01J35/04

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.

公开(公告)号：US11791122B2

公开(公告)日：2023-10-17

申请号：US17167340

申请日：2021-02-04

Applicant: Han Sung Lee

Inventor： Han Sung Lee

IPC: H01J35/06 ,  H01J35/16

CPC classification number: H01J35/065 ,  H01J35/16 ,  H01J2201/30469 ,  H01J2235/062

Abstract: The present disclosure relates to a CNT X-ray source apparatus, and more particularly, to a CNT X-ray source apparatus configured to maximize utilization of the internal space of a CNT X-ray tube body, having grooves made of an insulating material, and provided with a base portion for supporting a plurality of electrodes. With this configuration, mass production is possible. The CNT X-ray source apparatus of the present disclosure includes a cathode electrode; an emitter provided on the cathode electrode and responsible for emitting electrons; a gate electrode disposed above the cathode electrode and spaced apart from the cathode electrode by a predetermined interval; a focusing electrode for preventing scattering of electrons emitted from the emitter; and a base portion responsible for supporting one or more of the cathode electrode, the gate electrode, and the focusing electrode and formed of an insulating material. In this case, one or more grooves for accommodating at least one of the cathode electrode, the gate electrode, and the focusing electrode are formed in the base portion.

公开(公告)号：US11791121B2

公开(公告)日：2023-10-17

申请号：US16868000

申请日：2020-05-06

Applicant: Massachusetts Institute of Technology ,  Instituto Tecnológico y de Estudios Superiores de Monterrey

Inventor： Luis Fernando Velásquez-García ,  Imperio Perales-Martinez

IPC: H01J1/304 ,  H01J49/08 ,  H01J35/06 ,  H01J9/02 ,  F03H1/00

CPC classification number: H01J1/3042 ,  F03H1/0025 ,  H01J9/025 ,  H01J35/064 ,  H01J35/065 ,  H01J49/08

Abstract: A field emission electron source and a method of manufacturing the same. A field emission electron source comprises an emitting electrode and an extractor gate electrode. The emitting electrode comprising a plurality of particles with nanosharp protrusions. The extractor gate electrode comprises a metal. The extractor gate electrode is formed in a same plane as the emitting electrode. The extractor gate electrode is formed surrounding the emitting electrode. A method of manufacturing a field emission electron source comprises forming an emitting electrode comprising a plurality of particles with nanosharp protrusions using a direct ink writing (DIW) printer. The method comprises forming an extractor gate electrode comprising a metal using the DIW printer.

公开(公告)号：US11728120B2

公开(公告)日：2023-08-15

申请号：US17572132

申请日：2022-01-10

Applicant: Moxtek, Inc.

Inventor： Eric Miller

IPC: H01J35/06

CPC classification number: H01J35/064

Abstract: A planar filament 11f can include multiple materials to increase electron emission in desired directions and to suppress electron emission in undesired directions. The filament 11f can include a core-material CM between a top-material TM and a bottom-material BM. The top-material TM can have a lowest work function WFt; the bottom-material BM can have a highest work function WFb; and the core-material CM can have an intermediate work function WFc(WFt Wb). This shape makes it easier to coat the edges 31e with the bottom-material BM, because the edges 31e tilt toward and partially face the sputter target. This shape also helps direct more electrons to a center of the target 14, and reduce electron emission in undesired directions.

公开(公告)号：US20230154716A1

公开(公告)日：2023-05-18

申请号：US18146438

申请日：2022-12-26

Applicant: SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.

Inventor： Cheng NI ,  Gang PAN ,  Zhangfan DENG ,  Mingyuan SONG ,  Zongrui SUN ,  Haoshan ZHU ,  Feichao FU ,  Jincheng MEI ,  Chengjia YUAN ,  Li WANG ,  Xiaofeng ZHANG ,  Jianxiong ZOU

IPC: H01J1/22 ,  H01J35/06

CPC classification number: H01J1/22 ,  H01J35/064

Abstract: The present disclosure is related to a microwave source. The microwave source may include a cathode heater and a thermionic emitter. The cathode heater may include a first component, and a second component enclosing at least a portion of the first component. The thermionic emitter may be configured to release electrons when the thermionic emitter is heated by the cathode heater. At least a portion of the second component of the cathode heater may be in contact with the thermionic emitter.

公开(公告)号：US11581160B2

公开(公告)日：2023-02-14

申请号：US16800432

申请日：2020-02-25

Applicant: GE Precision Healthcare LLC

Inventor： Andrew Jay Borland ,  Andrew Marconnet

IPC: H01J35/06 ,  A61B6/03 ,  C23F1/02 ,  H01J9/02 ,  B23P9/04

Abstract: Various methods and systems are provided for a cathode cup having a surface texturing to aid in adherence of emitter deposited films. In one embodiment, a method may include chemically and/or mechanically texturing a surface of a cathode cup to form a plurality of features with a higher than threshold depth of each feature, the surface of the cathode cup facing an emitter coupled to the cathode cup.

公开(公告)号：US20230036147A1

公开(公告)日：2023-02-02

申请号：US17872782

申请日：2022-07-25

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Yoon-Ho SONG ,  Jun-Tae Kang ,  Jae-Woo Kim ,  Sora Park ,  Jin-Woo Jeong

IPC: H01J35/06 ,  H01J35/10 ,  H01J35/04

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.

公开(公告)号：US20220392730A1

公开(公告)日：2022-12-08

申请号：US17889787

申请日：2022-08-17

Applicant: AweXome Ray, Inc.

Inventor： Se Hoon Gihm ,  Keun Soo Jeong

IPC: H01J35/06 ,  H01J1/304 ,  H01J9/02

Abstract: The present invention provides an emitter, which comprises carbon nanotubes and is excellent in the efficiency of electron emission, and an X-ray tube comprising the same.

公开(公告)号：US11510306B2

公开(公告)日：2022-11-22

申请号：US17111764

申请日：2020-12-04

Applicant: Hologic, Inc.

Inventor： Guoyun Ru

IPC: H01J35/14 ,  H05G1/02 ,  H01J35/06 ,  H05G1/58

Abstract: An x-ray tube having at least one focusing cup and an anode. The x-ray tube may have a first filament positioned in a first location between the focusing cup and the anode, the first filament having a first size, and a second filament positioned in a second location between the focusing cup and anode, the second filament having a second size that is substantially the same as the first size. The x-ray tube may also include a switching mechanism configured to engage the second filament upon failure of the first filament.