公开(公告)号：US2664516A

公开(公告)日：1953-12-29

申请号：US23811451

申请日：1951-07-23

Applicant: THEODOR ZIMMER ,  ECKHARD FENNER

Inventor： THEODOR ZIMMER ,  ECKHARD FENNER

IPC: H01J35/04 ,  H01J35/10

CPC classification number: H01J35/101 ,  H01J35/04

公开(公告)号：US2110604A

公开(公告)日：1938-03-08

申请号：US3769735

申请日：1935-08-24

Applicant: WESTINGHOUSE ELECTRIC & MFG CO

Inventor： WILLIAM LANGHANS OTTO

IPC: H01J35/04 ,  H05G1/04

CPC classification number: H01J35/04 ,  H05G1/04

公开(公告)号：US1659133A

公开(公告)日：1928-02-14

申请号：US75681324

申请日：1924-12-18

Applicant: GEN ELECTRIC

Inventor： COOLIDGE WILLIAM D

IPC: H01J35/04

CPC classification number: H01J35/04

公开(公告)号：US1596405A

公开(公告)日：1926-08-17

申请号：US49591021

申请日：1921-08-27

Applicant: DECHEND HERMANN V

Inventor： DECHEND HERMANN V

IPC: H01J35/04

CPC classification number: H01J35/04

公开(公告)号：US1590971A

公开(公告)日：1926-06-29

申请号：US49701221

申请日：1921-08-30

Applicant: OTTO GOETZE

Inventor： OTTO GOETZE

IPC: H01J35/04

CPC classification number: H01J35/04

公开(公告)号：US20180228011A1

公开(公告)日：2018-08-09

申请号：US15888219

申请日：2018-02-05

Applicant: Canon Medical Systems Corporation

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

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

CPC classification number: H05G1/32 ,  H01J35/04 ,  H01J35/06 ,  H01J35/08 ,  H05G1/10 ,  H05G1/38 ,  H05G1/58

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：US20180144902A1

公开(公告)日：2018-05-24

申请号：US15820899

申请日：2017-11-22

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Sergio Lemaitre

IPC: H01J35/14 ,  H01J35/06 ,  H01J35/08

CPC classification number: H01J35/14 ,  H01J35/04 ,  H01J35/06 ,  H01J35/08 ,  H01J35/16 ,  H01J2235/168

Abstract: In the present invention, a cathode is formed with one or more emitters energized to emit electrons that are accelerated towards an anode or target spaced from the cathode. Between the cathode and the target is disposed an ion barrier electrode defining an aperture therein disposed in alignment with the emitters to enable the electron beam to pass through the electrode. The barrier electrode is operably connected to a voltage supply to positively bias the barrier electrode, and the barrier electrode is shaped to minimize the required supply voltage. This positive voltage bias creates a positive potential barrier across the electrode sufficient to repel positive ions generated by the electron beam, protecting the cathode from contact with the ions and increasing the stability of the focal spot generated by the tube by maintaining the ions within the drift region between the ion barrier and the target.

公开(公告)号：US09966217B2

公开(公告)日：2018-05-08

申请号：US15717388

申请日：2017-09-27

Applicant: NIKON METROLOGY NV

Inventor： Roger Hadland

IPC: H01J35/10 ,  H01J35/02 ,  H01J35/16 ,  F16J15/16 ,  H01J29/48 ,  F16C35/04 ,  F16C33/76 ,  H02M1/32 ,  H05G1/12 ,  H02M7/10 ,  H01J35/04

CPC classification number: H01J35/025 ,  F16C33/768 ,  F16C35/042 ,  F16J15/16 ,  H01J29/48 ,  H01J35/04 ,  H01J35/06 ,  H01J35/101 ,  H01J35/106 ,  H01J35/108 ,  H01J35/16 ,  H01J37/065 ,  H01J2235/0236 ,  H01J2235/083 ,  H01J2235/086 ,  H01J2235/087 ,  H01J2235/1046 ,  H01J2235/1204 ,  H01J2235/1262 ,  H01J2235/20 ,  H01J2237/2482 ,  H02M1/32 ,  H02M7/106 ,  H05G1/12

Abstract: Disclosed herein are a high-voltage generator for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target, and an x-ray source. These various aspects may separately and/or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode electrically connected intermediate of a first voltage multiplier and a second voltage multiplier. The electron beam apparatus includes control photodetectors and photo emitters having a transparent conductive shield arranged therebetween. The rotary vacuum seal includes a pumpable chamber at a position intermediate between high-pressure and low-pressure ends of a bore for a rotating shaft. The rotary target assembly is configured such that when a torque between a bearing housing and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target has a plurality of target plates supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x-ray gun is provided with a shield electrode maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.

公开(公告)号：US09947501B2

公开(公告)日：2018-04-17

申请号：US15717372

申请日：2017-09-27

Applicant: NIKON METROLOGY NV

Inventor： Roger Hadland

IPC: H01J35/06 ,  H01J35/02 ,  H01J35/16 ,  F16J15/16 ,  H01J29/48 ,  F16C35/04 ,  F16C33/76 ,  H02M1/32 ,  H05G1/12 ,  H02M7/10 ,  H01J35/10 ,  H01J35/04 ,  H01J37/065

CPC classification number: H01J35/025 ,  F16C33/768 ,  F16C35/042 ,  F16J15/16 ,  H01J29/48 ,  H01J35/04 ,  H01J35/06 ,  H01J35/101 ,  H01J35/106 ,  H01J35/108 ,  H01J35/16 ,  H01J37/065 ,  H01J2235/0236 ,  H01J2235/083 ,  H01J2235/086 ,  H01J2235/087 ,  H01J2235/1046 ,  H01J2235/1204 ,  H01J2235/1262 ,  H01J2235/20 ,  H01J2237/2482 ,  H02M1/32 ,  H02M7/106 ,  H05G1/12

Abstract: Disclosed herein are a high-voltage generator for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target, and an x-ray source. These various aspects may separately and/or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode electrically connected intermediate of a first voltage multiplier and a second voltage multiplier. The electron beam apparatus includes control photodetectors and photo emitters having a transparent conductive shield arranged therebetween. The rotary vacuum seal includes a pumpable chamber at a position intermediate between high-pressure and low-pressure ends of a bore for a rotating shaft. The rotary target assembly is configured such that when a torque between a bearing housing and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target has a plurality of target plates supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x-ray gun is provided with a shield electrode maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.

公开(公告)号：US09941090B2

公开(公告)日：2018-04-10

申请号：US15717402

申请日：2017-09-27

Applicant: NIKON METROLOGY NV

Inventor： Roger Hadland

IPC: H01J35/10 ,  H01J35/02 ,  H01J35/16 ,  F16J15/16 ,  H01J29/48 ,  F16C35/04 ,  F16C33/76 ,  H02M1/32 ,  H05G1/12 ,  H02M7/10 ,  H01J35/04

CPC classification number: H01J35/025 ,  F16C33/768 ,  F16C35/042 ,  F16J15/16 ,  H01J29/48 ,  H01J35/04 ,  H01J35/06 ,  H01J35/101 ,  H01J35/106 ,  H01J35/108 ,  H01J35/16 ,  H01J37/065 ,  H01J2235/0236 ,  H01J2235/083 ,  H01J2235/086 ,  H01J2235/087 ,  H01J2235/1046 ,  H01J2235/1204 ,  H01J2235/1262 ,  H01J2235/20 ,  H01J2237/2482 ,  H02M1/32 ,  H02M7/106 ,  H05G1/12

Abstract: Disclosed herein are a high-voltage generator for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target, and an x-ray source. These various aspects may separately and/or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode electrically connected intermediate of a first voltage multiplier and a second voltage multiplier. The electron beam apparatus includes control photodetectors and photo emitters having a transparent conductive shield arranged therebetween. The rotary vacuum seal includes a pumpable chamber at a position intermediate between high-pressure and low-pressure ends of a bore for a rotating shaft. The rotary target assembly is configured such that when a torque between a bearing housing and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target has a plurality of target plates supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x-ray gun is provided with a shield electrode maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.