WO2020136912A1 - 電子銃、x線発生装置およびx線撮像装置 - Google Patents
電子銃、x線発生装置およびx線撮像装置 Download PDFInfo
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- WO2020136912A1 WO2020136912A1 PCT/JP2018/048608 JP2018048608W WO2020136912A1 WO 2020136912 A1 WO2020136912 A1 WO 2020136912A1 JP 2018048608 W JP2018048608 W JP 2018048608W WO 2020136912 A1 WO2020136912 A1 WO 2020136912A1
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- 238000003384 imaging method Methods 0.000 title claims description 9
- 238000004891 communication Methods 0.000 claims abstract description 30
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 239000000284 extract Substances 0.000 abstract 1
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 8
- 238000010894 electron beam technology Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
- H01J35/064—Details of the emitter, e.g. material or structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/46—Control electrodes, e.g. grid; Auxiliary electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/14—Arrangements for focusing or reflecting ray or beam
- H01J3/18—Electrostatic lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
- H01J35/066—Details of electron optical components, e.g. cathode cups
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
- H01J35/147—Spot size control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/16—Vessels; Containers; Shields associated therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
- H01J37/10—Lenses
- H01J37/12—Lenses electrostatic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/20—Sources of radiation
- G01N2223/204—Sources of radiation source created from radiated target
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2235/00—X-ray tubes
- H01J2235/20—Arrangements for controlling gases within the X-ray tube
Definitions
- the present invention relates to an electron gun, an X-ray generator, and an X-ray imaging device.
- the electron gun is used, for example, in an X-ray generator that generates X-rays.
- the electron gun may include, for example, an extraction electrode for extracting electrons and a focusing electrode for focusing the electrons extracted by the extraction electrode.
- Patent Document 1 describes an X-ray tube incorporating an electron gun.
- the X-ray tube described in Patent Document 1 includes a cathode, a target, a first control grid arranged between the cathode and the target, and a second control arranged between the first control grid and the target. Including grid and.
- the cathode, the first control grid and the second control grid are understood as components of the electron gun.
- the second control grid has an aperture limiting element. A minute beam size can be obtained by providing an aperture limiting element.
- the aperture limiting element when the aperture limiting element is provided, a space where the movement of gas is limited is formed between the aperture limiting element and the cathode.
- gas When electrons collide with the aperture limiting element, gas may be released from the aperture limiting element. The gas may stay in the space between the aperture limiting element and the cathode for a long time.
- the electrons from the cathode collide with the gas the gas is ionized. The ions thus generated can be accelerated towards the cathode and strike the cathode. This can degrade the cathode.
- the present invention aims to provide an advantageous technique for suppressing the deterioration of the cathode.
- a first aspect of the present invention relates to an electron gun, wherein the electron gun has a cathode having an electron emission portion, an extraction electrode for extracting an electron emitted from the electron emission portion, and an electron extracted by the extraction electrode. And a focusing electrode for focusing.
- the converging electrode includes an outer electrode having a tubular shape, and an inner electrode arranged inside the outer electrode, the inner electrode defining a columnar first space, and a first surface on the cathode side. And a second surface opposite to the first surface, and the inner surface of the outer electrode and the second surface of the inner electrode define a second space.
- the inner electrode has an electron passage hole that allows electrons to pass therethrough, and a communication portion that communicates the first space and the second space.
- a second aspect of the present invention relates to an X-ray generator, wherein the X-ray generator emits X-rays by colliding electrons from the electron gun according to the first aspect of the present invention with the electron gun.
- a third aspect of the present invention relates to an X-ray imaging apparatus, and the X-ray imaging apparatus transmits the X-ray generation apparatus according to the second aspect of the present invention and an object emitted from the X-ray generation apparatus. And an X-ray detection device that detects X-rays.
- an advantageous technique for suppressing the deterioration of the cathode is provided.
- Sectional drawing which shows typically the structure of the electron gun of 1st Embodiment of this invention.
- the figure which shows the 1st example of the B-B' cross section in FIG. The figure which shows the 2nd example of the AA' cross section in FIG.
- FIG. 2 is a diagram illustrating a cross section taken along the line A-A′ in FIG. 1.
- Sectional drawing which shows the structure of the electron gun of 2nd Embodiment of this invention typically.
- Sectional drawing which shows the structure of the electron gun of 4th Embodiment of this invention typically. Sectional drawing which shows typically the structure of the modification of the electron gun of 1st Embodiment of this invention.
- FIG. 1 schematically shows the configuration of the electron gun EG according to the first embodiment of the present invention.
- FIG. 2 illustrates the B-B′ cross section in FIG. 1.
- FIG. 3 illustrates a first example of the A-A′ cross section in FIG. 1.
- FIG. 4 illustrates a second example of the A-A′ cross section in FIG. 1.
- FIG. 5 illustrates a third example of the A-A′ cross section in FIG. 1.
- the electron gun EG can be used by being arranged in a vacuum container (not shown).
- the electron gun EG is not limited to a specific application, but can be used as a component of an X-ray generator described later, and can also be used in other electron beam application devices such as an electron microscope and an electron beam drawing device.
- the electron gun EG includes a cathode 10 having an electron emitting portion for emitting electrons, an extraction electrode 30 for extracting the electrons emitted from the electron emitting portion, and a focusing electrode 40 for converging the electrons extracted by the extraction electrode 30.
- the cathode 10 may have, for example, a filament as an electron emitting portion. Electrons can be emitted by heating the filament.
- the extraction electrode 30 has a passage hole 32 through which electrons pass.
- the electron gun EG may include a gate electrode 20 between the cathode 10 and the extraction electrode 30.
- the gate electrode 20 has a passage hole 22 that allows electrons to pass therethrough.
- the focusing electrode 40 may include an outer electrode 41 having a tubular shape and an inner electrode 42 arranged inside the outer electrode 41.
- the inner electrode 42 may have an inner side surface located on the cathode 10 side and an outer side surface opposite to the inner side surface.
- the inner side surface of the inner electrode 42 may have a first inner side surface LW1 (first surface) and a second inner side surface LW2 having an angle with the first inner side surface LW1.
- the outer surface of the inner electrode 42 is a first outer surface UP1 (second surface) opposite to the first inner surface LW1 (first surface), and a first outer surface UP1 opposite to the second inner surface LW2. And a second outer surface UP2 having an angle with.
- the first space SP1 may be defined by the inner side surfaces LW1 and LW2 of the inner electrode 42.
- a part of the first space SP1 may be defined by the first inner side surface LW1 or the second inner side surface LW2 of the inner electrode 42.
- the inner electrode 42 (the inner side surfaces LW1 and LW2 thereof) may define a columnar (eg, columnar) first space SP1 inside the inner electrode 42.
- the second space SP2 may be defined by the first outer surface UP1 of the inner electrode 42 and the inner surface IS1 of the outer electrode 41.
- the third space SP3 may be defined by the second outer surface UP2 of the inner electrode 42 and the inner surface IS1 of the outer electrode 41.
- the inner electrode 42 may include an electron passage hole 422 that allows electrons to pass therethrough, and a communication portion 431 that allows the first space SP1 and the third space SP3 to communicate with each other.
- the communication part 431 includes an inner space (first space SP1) of the inner electrode 43, an outer space UP1 and UP2 of the inner electrode 43, and an inner space IS1 of the outer electrode 41 (first space SP1).
- the second space SP2 and the third space SP3 are communicated with each other.
- the inner electrode 42 may have a plate portion 421 having an electron passage hole 422 and a tubular portion 43 having a tubular shape. In another aspect, one end of the tubular portion 43 may be connected to the plate portion 421.
- the focusing electrode 40 may further include a connecting portion 44 that connects the other end of the tubular portion 43 and the outer electrode 41.
- the connection portion 44 may be made of a conductive member or an insulator.
- the communication part 431 of the inner electrode 42 can communicate the first space SP1 and the second space SP2 via the third space SP3.
- the communication portion 431 may be provided in the tubular portion 43.
- the outer electrode 41 and the inner electrode 42 may be configured to have a coaxial structure with respect to the axis AX.
- the outer electrode 41 may include a cylindrical portion having the axis AX as a central axis.
- the inner electrode 42 may include a cylindrical portion having the axis AX as a central axis.
- the outer electrode 41 can be arranged so as to surround the inner electrode 42 laterally over the entire circumference.
- the outer electrode 41 may be arranged so as to surround the inner electrode 42 over the entire circumference in any cross section orthogonal to the axis AX so as to cut the inner electrode 42.
- the outer electrode 41 may be arranged so as to surround the communication portion 431 of the inner electrode 42.
- the outer electrode 41 may be arranged so as to surround the communication portion 431 of the inner electrode 42 in any of the cross sections orthogonal to the axis AX so as to cut the communication portion 431 of the inner electrode 42.
- the configuration as described above is effective for suppressing discharge between the inner electrode 42 of the focusing electrode 40 and a member (not shown) that may be disposed outside the focusing electrode 40. This works particularly advantageously when the inner electrode 42 has a portion with a small radius of curvature (a portion with a large curvature) that can induce discharge.
- the first space SP1 can be defined by the extraction electrode 30 in addition to the inner electrode 42.
- the first space SP1 is not a closed space but communicates with the second space SP2 via the electron passage hole 422 and the communication portion 431.
- the first space SP1 communicates with the space on the cathode 10 side via the passage hole 32.
- the outer electrode 41 and the inner electrode 42 can be electrically connected to each other and given the same potential.
- the outer electrode 41, the inner electrode 42, and the connecting portion 44 may be electrically connected to each other and given the same potential.
- the extraction electrode 30 may be electrically connected to the inner electrode 42, or may be electrically insulated from the inner electrode 42 and given a potential different from the potential given to the inner electrode 42.
- the extraction electrode 30 is fixed to the focusing electrode 40.
- FIG. 10 shows a modification of the first embodiment. In the example shown in FIG. 10, the extraction electrode 30 is supported by the focusing electrode 40 (outer electrode 41) via the insulator 39.
- the plate portion 421 provided on the inner electrode 42 of the focusing electrode 40 limits the diameter of the electron beam reaching the second space SP2. Only the electrons that have passed through the electron passage holes 422 provided in the plate portion 421 form an electron beam that reaches the second space SP2. Other electrons collide with the plate portion 421 and are absorbed by the plate portion 421.
- the inner electrode 42 With the plate portion 421 having the electron passage hole 422, the electron beam emitted from the electron gun EG can be converged into a smaller area.
- the gas from the plate 421 may be released by the collision of the electrons from the cathode 10 with the plate 421.
- the probability that electrons from the cathode 10 collide with the gas increases.
- the collision of electrons with the gas can ionize the gas.
- the ions thus generated can be accelerated toward the cathode 10 and collide with the cathode 10. This can cause the cathode 10 to deteriorate. Therefore, in the electron gun EG of the first embodiment, the inner electrode 42 is provided with a communication portion 431 that connects the first space SP1 and the second space SP2.
- the communication part 431 can be arranged at a position where electrons do not enter it, or at a position where electrons are unlikely to enter it. From another point of view, the communication part 431 can be arranged at a position where electrons cannot pass.
- the communication part 431 allows the gas that may be generated in the first space SP1 to be quickly discharged from the first space SP1 to the second space SP2, which functions to suppress the deterioration of the cathode 10.
- the converging electrode 40 may be configured such that there is a linear path between the region of the plate portion 421 where electrons can collide and the inner side surface IS1 of the outer electrode 41 via the communication portion 431.
- the converging electrode 40 may be configured such that there is a linear path via the communication portion 431 between the electron passage hole 422 provided in the plate portion 421 and the inner side surface IS1 of the outer electrode 41.
- a plurality of communicating portions 431 can be provided in the inner electrode 42, but only a single communicating portion 431 may be provided in the inner electrode 42.
- a cross section (AA' cross section) orthogonal to the axis AX so as to cut the communication part 431 the ratio of the area of the communication part 431 to the area of the inner electrode 42 (the part other than the communication part 431) is arbitrarily determined. Can be done.
- the presence of the communication portion 431 has a small effect on the function of converging the electrons from the cathode 10.
- the area of the communication part 431 is the inner electrode 42 (the part other than the communication part 431). Can be larger than the area. This is advantageous for prompt discharge of gas from the first space SP1 to the second space SP2.
- the outer electrode 41 has a first end E1 on the electron emitting portion side of the cathode 10 and a second end E2 opposite to the first end E1, and the second end E2 is [01]. It may be configured to have no corners. Such a configuration is effective in suppressing discharge between the outer electrode 41 and a member that can be arranged outside thereof.
- FIG. 6 schematically shows the configuration of the electron gun EG according to the second embodiment of the present invention. Matters not mentioned in the second embodiment can comply with the first embodiment.
- the first space SP1 and the second space SP2 are directly connected by the communication portion 431.
- the communication part 431 in the cross section parallel to the axis AX, the communication part 431 constitutes a curved exhaust path. From another viewpoint, in the second embodiment, in the cross section parallel to the axis AX, the communication part 431 constitutes an exhaust path that is neither parallel nor perpendicular to the axis AX.
- FIG. 7 schematically shows the configuration of the electron gun EG according to the third embodiment of the present invention. Matters not mentioned as the third embodiment can comply with the first or second embodiment.
- the extraction electrode 30 defines a part of the first space SP1.
- the extraction electrode 30 separates the first space SP1 and the fourth space SP4 on the cathode 10 side.
- the extraction electrode 30 has a through hole 33 that is separated from the passage hole 32, in addition to the passage hole 32 that allows electrons to pass therethrough.
- the through hole 33 enables the gas that may be generated by the collision of electrons to the plate portion 421 to be discharged to the fourth space SP4.
- the shortest distance between the through hole 32 and the through hole 33 is preferably 5 times or more the radius of the through hole 33.
- the shortest distance between the through hole 32 and the through hole 33 is preferably 50 times or less the radius of the through hole 33. Therefore, the shortest distance between the through hole 32 and the through hole 33 is preferably 5 times or more and 50 times or less the radius of the through hole 33.
- the extraction electrode 30 can have a plurality of through holes 33.
- the plurality of through holes 33 may be arranged rotationally symmetrical with respect to the axis AX.
- FIG. 8 schematically shows the configuration of the electron gun EG according to the fourth embodiment of the present invention. Matters not mentioned as the fourth embodiment may be according to each of the first to third embodiments or a combination of two of them.
- the first space SP1 includes a first portion SP11 and a second portion SP12 between the first portion SP11 and the extraction electrode 30.
- the first portion SP11 and the second portion SP12 can be distinguished from each other by the size of the focusing electrode 40 in the direction orthogonal to the axis AX.
- the dimension of the second portion SP12 in the direction orthogonal to the axis AX of the focusing electrode 40 is larger than the dimension of the first portion SP11 in the direction orthogonal to the axis AX.
- the portion of the inner electrode 42 that defines the second portion SP12 is separated from the outer electrode 41, but may be in contact with the outer electrode 41. Such a configuration is advantageous for increasing the distance between the through hole 33 and the passage hole 32.
- FIG. 9 schematically shows the configuration of the electron gun EG according to the fifth embodiment of the present invention. Matters not mentioned as the fifth embodiment may be according to each of the first to fourth embodiments or a combination of two or more thereof.
- the first space SP1 includes a first portion SP11 and a second portion SP12 between the first portion SP11 and the extraction electrode 30.
- the first portion SP11 and the second portion SP12 can be distinguished from each other by a dimension in a direction orthogonal to the axis AX of the focusing electrode 40.
- the dimension of the second portion SP12 in the direction orthogonal to the axis AX of the focusing electrode 40 is larger than the dimension of the first portion SP11 in the direction orthogonal to the axis AX.
- the dimension of the second portion SP12 in the direction orthogonal to the axis AX of the converging electrode 40 increases toward the cathode 10 side.
- the through hole 33 and the passage hole 32 are formed. This is advantageous for increasing the distance.
- FIG. 11 schematically shows the configuration of the X-ray generation tube 1 according to the embodiment of the present invention.
- the X-ray generation tube 1 can include the electron gun EG of the first to fifth embodiments and an anode 93 having a target 933 that generates X-rays when electrons from the electron gun EG collide.
- the X-ray generation tube 1 includes a cathode 91, and the cathode 91 can be electrically connected to the cathode 10 of the electron gun EG.
- the X-ray generation tube 1 includes an insulating tube 92, an anode 93 is arranged so as to close one of the two open ends of the insulating tube 92, and a cathode so as to close the other of the two open ends of the insulating tube 92. 91 may be arranged.
- the anode 93 may include a target 933, a target holding plate 932 that holds the target 933, and an electrode 931 that holds the target holding plate 932.
- the electrode 931 is electrically connected to the target 933 and gives a potential to the target 933.
- the target 933 generates X-rays when electrons from the electron gun EG collide with the target 933.
- the generated X-rays pass through the target holding plate 932 and are radiated to the outside of the X-ray generation tube 1.
- the anode 93 can be maintained at, for example, the ground potential, but may be maintained at another potential.
- the target 933 can be made of a material having a high melting point and a high X-ray generation efficiency, for example, tungsten, tantalum, or molybdenum.
- the target holding plate 932 can be made of, for example, a conductive material that transmits X-rays, such as beryllium and diamond.
- FIG. 12 shows the configuration of the X-ray generator 100 according to the embodiment of the present invention.
- the X-ray generation device 100 may include the X-ray generation tube 1 described above and a drive circuit 3 that drives the X-ray generation tube 1.
- the X-ray generation device 100 may further include a booster circuit 2 that supplies a boosted voltage to the drive circuit 3.
- the X-ray generation device 100 may further include a storage container 4 that stores the X-ray generation tube 1, the drive circuit 3, and the booster circuit 2.
- the storage container 4 may be filled with insulating oil.
- FIG. 13 shows the configuration of the X-ray imaging apparatus 200 according to the embodiment of the present invention.
- the X-ray imaging apparatus 200 may include the X-ray generation apparatus 100 and an X-ray detection apparatus 110 that detects the X-rays 104 emitted from the X-ray generation apparatus 100 and transmitted through the object 106.
- the X-ray imaging apparatus 200 may further include a control device 120 and a display device 130.
- the X-ray detection device 110 may include an X-ray detector 112 and a signal processing unit 114.
- the control device 120 can control the X-ray generation device 100 and the X-ray detection device 110.
- the X-ray detector 112 detects or images the X-rays 104 emitted from the X-ray generator 100 and transmitted through the object 106.
- the signal processing unit 114 may process the signal output from the X-ray detector 112 and supply the processed signal to the control device 120.
- the control device 120 causes the display device 130 to display an image based on the signal supplied from the signal processing unit 114.
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Abstract
Description
Claims (12)
- 電子放出部を有するカソードと、前記電子放出部から放出された電子を引き出す引出電極と、前記引出電極によって引き出された電子を収束させる収束電極とを備える電子銃であって、
前記収束電極は、管形状を有する外側電極と、前記外側電極の内側に配置された内側電極とを含み、前記内側電極は、柱状の第1空間を規定し、前記カソードの側の第1面と前記第1面の反対側の第2面とを有し、前記外側電極の内側面および前記内側電極の前記第2面は、第2空間を規定し、
前記内側電極は、電子を通過させる電子通過孔と、前記第1空間と前記第2空間とを連通させる連通部とを有する、
ことを特徴とする電子銃。 - 前記外側電極は、前記連通部を取り囲んでいる、
ことを特徴とする請求項1に記載の電子銃。 - 前記内側電極は、前記電子通過孔を有する板部と、管形状を有する管形状部とを有し、前記管形状部の一端が前記板部に接続され、
前記連通部は、前記管形状部に設けられている
ことを特徴とする請求項1又は2に記載の電子銃。 - 前記管形状部の外側面と前記外側電極の前記内側面との間に第3空間が規定され、前記内側電極の前記連通部は、前記第3空間を介して前記第1空間と前記第2空間とを連通させる、
ことを特徴とする請求項3に記載の電子銃。 - 前記引出電極は、電子を通過させる通過孔と、前記通過孔から離隔して配置された貫通孔とを有する、
ことを特徴とする請求項1乃至4のいずれか1項に記載の電子銃。 - 前記第1空間は、第1部分と、前記第1部分と前記引出電極の間の第2部分とを含み、前記収束電極の軸に直交する方向における前記第2部分の寸法は、前記収束電極の軸に直交する方向における前記第1部分の寸法より大きい、
ことを特徴とする請求項5に記載の電子銃。 - 前記第2部分の前記寸法は、前記カソードの側に向かって大きくなる、
ことを特徴とする請求項6に記載の電子銃。 - 前記通過孔と前記貫通孔との最短距離は、前記貫通孔の半径の5倍以上かつ50倍以下である、
ことを特徴とする請求項5乃至7のいずれか1項に記載の電子銃。 - 前記引出電極は、前記収束電極に固定されている、
ことを特徴とする請求項1乃至8のいずれか1項に記載の電子銃。 - 前記引出電極は、前記収束電極に電気的に接続されている、
ことを特徴とする請求項1乃至9のいずれか1項に記載の電子銃。 - 請求項1乃至10のいずれか1項に記載の電子銃と、
前記電子銃からの電子が衝突することによってX線を発生するターゲットを有するアノードと、
を備えることを特徴とするX線発生装置。 - 請求項11に記載のX線発生装置と、前記X線発生装置から放射され物体を透過したX線を検出するX線検出装置と、を備えることを特徴とするX線撮像装置。
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JP2019536613A JP6571907B1 (ja) | 2018-12-28 | 2018-12-28 | 電子銃、x線発生装置およびx線撮像装置 |
EP18944979.6A EP3905299A4 (en) | 2018-12-28 | 2018-12-28 | ELECTRON GUN, X-RAY GENERATION DEVICE AND X-RAY IMAGING DEVICE |
CN201880100506.6A CN113316833B (zh) | 2018-12-28 | 2018-12-28 | 电子枪、x射线产生装置以及x射线成像装置 |
PCT/JP2018/048608 WO2020136912A1 (ja) | 2018-12-28 | 2018-12-28 | 電子銃、x線発生装置およびx線撮像装置 |
TW108146822A TWI730553B (zh) | 2018-12-28 | 2019-12-20 | 電子槍、x射線產生裝置及x射線攝像裝置 |
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TWI730553B (zh) | 2021-06-11 |
EP3905299A1 (en) | 2021-11-03 |
EP3905299A4 (en) | 2022-04-06 |
CN113316833B (zh) | 2022-10-04 |
CN113316833A (zh) | 2021-08-27 |
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