公开(公告)号：US10791615B2

公开(公告)日：2020-09-29

申请号：US16086440

申请日：2017-03-21

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Lester Donald Miller ,  Nirmal Soni ,  Rolf Karl Otto Behling ,  Roland Proksa ,  Dionys Van De Ven

IPC: H05G1/32 ,  H05G1/58 ,  H01J35/06 ,  H01J35/10 ,  H01J35/04 ,  G01V5/00 ,  H05G1/10

Abstract: The present invention relates to an apparatus for generating X-rays. It is described to produce (210) with a power supply (40) at least two voltages between at least one cathode (20) and an anode (30), wherein the at least two voltages comprises a first voltage and a second voltage. The at least one cathode is positioned relative to the anode. Electrons are emitted (220) from the at least one cathode. Electrons emitted from the at least one cathode are interacted (230) with the anode with energies corresponding to the at least two voltages. X-rays are generated (230) from the anode, wherein the electrons interact with the anode to generate the X-rays. First X-rays are generated when the power supply produces the first voltage and second X-rays are generated when the power supply produces the second voltage. The power supply is controlled (250), such that a ratio between the first X-rays and the second X-rays is controllable.

公开(公告)号：US10770256B1

公开(公告)日：2020-09-08

申请号：US16814192

申请日：2020-03-10

Applicant: Siemens Healthcare GmbH

Inventor： Florian Seperant

IPC: H01J35/06 ,  H01J1/18

Abstract: A flat emitter, in an embodiment, includes an emitter surface to emit electrons when a filament current is applied; a first end region including at least one first connection leg; and a second end region including at least one second connection leg. According to an embodiment, at least one connection leg is embodied as a band-type connection leg and is torsioned at an angle in a longitudinal axis. According to an embodiment, the first connection leg and the second connection leg are embodied as band-type connection legs and in each case are torsioned at a definable angle in a longitudinal axis. As a result, a simply constructed flat emitter in terms of design is achieved, with a longer service life and a high level of electron emission.

公开(公告)号：US20200273656A1

公开(公告)日：2020-08-27

申请号：US16281716

申请日：2019-02-21

Applicant: Varex Imaging Corporation

Inventor： Wayne R. Hansen ,  Vance S. Robinson ,  Kasey O. Greenland ,  Gangqiang Wang

IPC: H01J35/06 ,  H01J35/10 ,  H01J35/18 ,  H01J35/14

Abstract: An emitter for a closed x-ray tube includes an emitter body formed of a low work function emitter material, the emitter body having a major surface and a secondary surface. The major surface is adapted for emission of electrons from the low work function material. The emitter assembly is adapted to reduce an emission current density emitted from the secondary surface of the emitter body, as compared to the major surface.

公开(公告)号：US20200245442A1

公开(公告)日：2020-07-30

申请号：US16842925

申请日：2020-04-08

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Hiroshi Hirayama ,  Sanae Harada ,  Takenori Mizuno ,  Masahiro Karahashi

IPC: H05G1/32 ,  H01J35/06 ,  H05G1/10 ,  H01J35/08 ,  H05G1/58 ,  H01J35/04

Abstract: According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube, a high voltage power supply, and focus size control circuitry. The X-ray tube includes a cathode, an anode, and a deflector configured to deflect the electrons from the cathode. The high voltage power supply generates a tube voltage to be applied between the cathode and the anode. The focus size control circuitry controls a focus size formed in the anode by applying to the deflector a deflecting voltage of a deflecting voltage value based on a tube voltage value of the tube voltage and a predetermined size, in order to form a focus of the predetermined size in the anode during the period where the tube voltage is applied by the high voltage power supply.

公开(公告)号：US10705030B2

公开(公告)日：2020-07-07

申请号：US14221319

申请日：2014-03-21

Applicant: NIKON CORPORATION

Inventor： Takashi Watanabe

IPC: G01N23/04 ,  G01N23/046 ,  G01N23/18 ,  H01J35/06 ,  H01J35/08 ,  H01J35/12 ,  H01J35/14 ,  H01J35/16 ,  H05G1/04 ,  H05G1/06 ,  H05G1/02 ,  H01J35/04

Abstract: Provided is an x-ray device capable of suppressing reduction in detection precision. The X-ray device irradiates x-rays on an object and detects X-rays that pass through the object. The X-ray device comprises: an X-ray source that emits X-rays; a stage that holds the object; a detection device that detects at least some of the x-rays that have been emitted from the X-ray source and have passed through the object; a chamber member that forms an internal space wherein the X-ray source, the stage, and the detection device are arranged; and a partitioning section that separates the internal space into a first space wherein the X-ray source is arranged and a second space wherein the detection device is arranged.

公开(公告)号：US20200185184A1

公开(公告)日：2020-06-11

申请号：US16775361

申请日：2020-01-29

Applicant: Canon Electron Tubes & Devices Co., Ltd.

Inventor： Takayuki Ito

IPC: H01J35/14 ,  H01J35/06 ,  H01J35/16

Abstract: According to one embodiment, an X-ray tube includes an anode including a target surface, and a cathode including a first filament and a focusing electrode. The focusing electrode includes a valley bottom portion, a first inclined plane sloping up from the valley bottom portion in a direction of the anode, a first focusing groove, and a first storage groove. θ1 is greater than 0°. The first focusing groove has a longitudinal axis. One end portion on the first extension line side of the first focusing groove is closer to a first reference surface than the other end portion of the first focusing groove.

公开(公告)号：US20200168426A1

公开(公告)日：2020-05-28

申请号：US16627527

申请日：2018-06-01

Applicant: Nuctech Company Limited ,  TSINGHUA UNIVERSITY

Inventor： Chengjun TAN ,  Wenhui HUANG ,  Chuanxiang TANG ,  Qingxiu JIN ,  Dongsheng ZHANG ,  Qun LUO ,  Donghai LIU ,  Luming ZHANG ,  Peidong WU

IPC: H01J35/14 ,  H01J35/06 ,  H01J35/16 ,  H01J35/12

Abstract: An anode target comprises: a plurality of target structures, used for receiving an electron beam emitted by a cathode to generate a ray, the plurality of target structures being of three-dimensional structures having bevels; a copper cooling body, used for bearing the target structures and comprising an oxygen-free copper cooling body; a cooling oil tube, used for cooling the anode target; and a shielding layer, used for achieving a shielding effect and comprising a tungsten shielding layer. The anode target, the ray light source, the computed tomography scanning device, and the imaging method in the present application are able to enable all target spots on the anode target to be distributed on a straight line, imaging quality of a ray system is improved, and complexity of an imaging system is reduced.

公开(公告)号：US20200154553A1

公开(公告)日：2020-05-14

申请号：US16612783

申请日：2018-05-30

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： ANAND KUMAR DOKANIA ,  ROLF KARL OTTO BEHLING

IPC: H05G1/52 ,  H01J35/06 ,  H01J35/08 ,  H05G1/32

Abstract: The present invention relates to an apparatus (10) for generating X-rays. It is described to produce (210) with at least one power supply (40) a voltage between a cathode (20) and an anode (30). The cathode is positioned relative to the anode, and the cathode and anode are operable such that electrons emitted from the cathode interact with the anode with energies corresponding to the voltage, and wherein the electrons interact with the anode at a focal spot to generate X-rays. The at least one power supply provides (220) the cathode with a cathode current. An electron detector (50) is positioned (230) relative to the anode, and a backscatter electron signal is measured (240) from the anode. The measured backscatter electron signal is provided (250) to a processing unit (60). The processing unit determines (260) a cathode current correction and/or a correction to the voltage between the cathode and the anode, wherein the determination comprises utilization of the measured backscatter electron signal and a correlation between anode surface roughness and backscatter electron emission. The cathode current correction and/or the correction to the voltage between the cathode and the anode is provided (270) to the at least one power supply.

公开(公告)号：US10651000B2

公开(公告)日：2020-05-12

申请号：US15409888

申请日：2017-01-19

Applicant: Beijing University of Technology

Inventor： Wei Liu ,  Mingchaung Tian ,  Jinshu Wang ,  Fan Zhou ,  Yiman Wang ,  Liran Dong ,  Yunfei Yang ,  Quan Zhang

IPC: B22F3/105 ,  H01J9/04 ,  B22F9/02 ,  B22F9/22 ,  C22B34/36 ,  B22F9/30 ,  H01J1/28 ,  H01J19/22 ,  H01J35/06

Abstract: The present disclosure discloses a preparation method of pressed Scandia-doped dispenser cathode using microwave sintering. Embodiments of the present disclosure include dissolving some nitrates and ammonium metatungstate with deionized water to prepare a homogeneous solution. Precursor powder with uniform size is obtained by spray drying, the precursor powder is decomposed, and two-step reduction may be proceeded to form doped tungsten powder with uniform element distribution. The cathode is prepared by one-time microwave sintering. One-time forming of cathode sintering is realized, and sintering shrinkage and sintering time are reduced significantly. The method has excellent repeatability, and the cathode has a homogeneous structure and excellent emission performance at 950° C.

公开(公告)号：US10573484B2

公开(公告)日：2020-02-25

申请号：US15689326

申请日：2017-08-29

Applicant: General Electric Company

Inventor： Edward Emaci ,  Ian Strider Hunt ,  Alexander Ryan ,  Michael Gorrilla

IPC: H01J35/10 ,  H01J35/06 ,  F16C17/06 ,  F16C35/02 ,  F16C23/04 ,  F16C39/06

Abstract: A structure and method of operation of a journal bearing is disclosed that minimizes contact of the shaft with the sleeve during start up and slow down of rotation of the shaft relative to the sleeve, or vice versa. The bearing assembly includes a gravitational load reduction mechanism with magnets disposed on the sleeve and on the shaft in alignment with one another. The magnet(s) on the shaft interacts with the magnet(s) disposed on the sleeve to provide a force against the pressure of the shaft towards the sleeve generated by gravity on the rotating component. The magnets enable centering of the rotating component within the stationary component during low rotation and non-rotation. This prevents rubbing of the rotating journal bearing component surfaces, e.g., sleeve, against the stationary journal bearing component, e.g., shaft, during assembly, ramp-up, and coast-down when the journal bearing fluid provides minimal or no bearing centering capability.