21results about "X-ray tube cathode assembly" patented technology

The vacuum tube insert assembly includes a flared insert having an annular flange and a stem, each constructed from glass. The stem extends axially from the flange. The flange surrounds an outer periphery of a plug concavity defined by the stem. A feedthrough pin passes axially through the stem and is sealed to the stem. The pin terminates inside the concavity to form a plug. A socket connects to the plug within the concavity and includes a receptacle that removably couples to the pin, with an engagement feature preventing an incorrect plug-socket connection. The method includes axially inserting the pin through the stem in a fixed relative position such that the pin is disposed within the plug concavity, sealing the stem such that the stem is vacuum sealed to the pin, thereby forming a plug, and removably coupling a mating receptacle of the socket to the pin.

Device for generating X-rays (X-ray tube) (40) comprising at least one cathode chamber (chamber) (41), a filament holder (42) with a filament (43) attached to its front face (42a), wherein the filament holder (42a) is connected to a high-voltage generator (44) by a high-voltage cable or originates directly from a high-voltage generator (44), a fastening device (45) for connecting the filament holder (42) or the generator (44) having a filament holder to the chamber (41), preferably designed for a vacuum-tight connection, wherein the front face (42a) of the filament holder (42) projects into the interior of the cathode chamber (41) in the connected state, characterized in that the fastening device (45) comprises a clamping and locking device (45) which has at least a quick-release clamping device (45a) and / or at least one clamping device (45a).which is accessible from the side facing away from the chamber (rear side) (44a) of the filament holder (42) or of the generator (44) having the filament holder (42).

A vacuum tube insert assembly includes a flared insert piece having an annular flange and a stem each constructed of glass. The stem extends axially from the flange. The flange surrounds a perimeter edge of a plug concavity defined by the stem. Feed-through pins pass axially through the stem and are sealed thereto. The pins terminate inside of the concavity to form a plug. A socket connects to the plug within the concavity and includes receptacles that removably couple to the pins, with an engagement feature preventing erroneous plug and socket connections. A method includes axially inserting the pins through the stem at a fixed relative position such that the pins are arranged within the plug concavity, sealing the stem such that the stem is vacuum-sealed to the pins, thereby forming the plug, and removably coupling mating receptacles of the socket to the pins.

Various methods and systems are provided for an emitter assembly for a cathode of an X-ray tube. In one example, an emitter assembly comprises a first end of a substantially flat emitter supported by two rods extending from a two-rod insulator assembly, and a second end of the substantially flat emitter supported by a compliant, single rod insulator assembly.

We provide a vacuum tube insertion assembly that prevents incorrect connections. [Solution] The vacuum tube insertion assembly includes a flared insertion part 40, each constructed from glass, having an annular flange 45 and a stem 46. The stem 46 extends axially from the flange 45, which surrounds the outer edge 47 of a plug recess 44 defined by the stem 46. A feedthrough pin 42 passes axially through the stem 46 and is sealed to the stem 46. The feedthrough pin 42 terminates inside the plug recess 44 to form the plug. The socket includes a receptacle that connects to the plug within the plug recess and is removably coupled to the feedthrough pin.

A filament assembly 10 for an x-ray tube 20 can include a planar filament 11 electrically-coupled between and substantially-encircled by a pair of collector plates C1 and C2. The pair of collector plates C1 and C2 can support the planar filament 11 so that it does not twist or warp and align the filament assembly 10 within a cathode cup 33. The pair of collector plates C1 and C2 can block electrons emitted from a back side of the filament. Without the collector plates C1 and C2, back side electrons can change direction by about 180°, hit the target, and distort a target electron spot. Each collector plate C1 or C2 can include holes H1 and H2. These holes H1 and H2 can aid in alignment of the collector plates C1 and C2 with electrodes 31 and electrode 32, can allow welding at a lower temperature, and can facilitate weld inspection.

Provided is a total reflection X-ray fluorescence spectrometer which has high analysis sensitivity and analysis speed. The total reflection X-ray fluorescence spectrometer includes: an X-ray source that has an electron beam focal point having an effective width in a direction parallel to a surface of a sample, and orthogonal to an X-ray irradiation direction, that is larger than a dimension in the irradiation direction; a reflective optic that has an effective width in the orthogonal direction that is larger than that of the electron beam focal point, and has a curved surface in the irradiation direction; and a plurality of detectors that are arranged in a row in the orthogonal direction, and are configured to measure intensities of fluorescent X-rays emitted from the sample irradiated with primary X-rays focused by the reflective optic.

The invention relates to a flat emitter with compliant support ends. Various methods and systems are provided for an emitter assembly for a cathode (352) of an X-ray tube. In one example, a transmitter assembly includes: a first end (426) of a substantially planar transmitter (424) supported by a dual pole extending from a dual pole insulator assembly (420); and a second end portion (428) of the substantially planar emitter (424), the second end portion being supported by a compliant single pole insulator assembly (414).

An X-ray tube according to an embodiment of the present invention comprises: an outer enclosure; the output window is in a plate shape and is arranged at the end part of the peripheral device; a target which is provided inside the outer enclosure and is opposite to the output window; a focusing electrode which is provided inside the outer enclosure, has a cylindrical shape, and surrounds the target; and the lamp filament is arranged in the periphery device and surrounds the focusing electrode. When a first line that passes through the center of the target-side surface of the output window and is in contact with the output-window-side end of the focus electrode is defined, the center of the filament is positioned on the side where the focus electrode is provided with respect to the first line.

Various methods and systems are provided for an emitter assembly for a cathode (352) of an X-ray tube. In one example, an emitter assembly comprises a first end (426) of a substantially flat emitter (424) supported by two rods extending from a two-rod insulator assembly (420), and a second end (428) of the substantially flat emitter (424) supported by a compliant, single rod insulator assembly (414).

There is provided an X-ray source comprising an electron source for providing an electron beam, the electron source comprising a cathode, a Wehnelt, and an anode; an electron optic arrangement configured to deflect and focus the electron beam towards a target for generation of X-ray radiation; an arrangement for determining a quantity indicative of a width of the electron beam; and a controller operatively connected to the electron source, the electron optic arrangement, and the arrangement for determining the quantity indicative of a width of the electron beam, the controller configured to compute a quantity dependent on a divergence of the electron beam at an entrance of the electron optic arrangement based on the quantity indicative of a width of the electron beam; and apply a bias voltage to the Wehnelt such that the quantity dependent on the divergence of the electron beam at the entrance of the electron optic arrangement is adjusted towards a desired value. A corresponding method is also provided.

To provide an X-ray tube capable of suppressing adhesion of metal atoms separated from a filament to an output window.SOLUTION: The X-ray tube according to the embodiment includes an envelope, an output window having a plate shape and provided at an end portion of the envelope, a target provided inside the envelope and facing the output window, a focusing electrode provided inside the envelope, having a tubular shape, and surrounding the target, and a filament provided inside the envelope and surrounding the focusing electrode. When a first line passing through a center of a surface of the output window on the target side and being in contact with an end portion of the focusing electrode on the output window side is defined, a center of the filament is located on a side where the focusing electrode is provided with respect to the first line.SELECTED DRAWING: Figure 4

An X-ray tube includes a housing; an electron gun that emits an electron beam inside the housing; and a target that generates an X-ray upon the electron beam being incident on the target inside the housing. The electron gun includes a cathode that releases electrons, and a focusing electrode that focuses the electrons onto the target as the electron beam. The focusing electrode has a tubular shape having an inner surface and an outer surface. The inner surface includes a first region, and a second region located on a target side with respect to the first region. An average roughness of the second region is smaller than an average roughness of the first region.

Various methods and systems are provided for an emitter assembly for a cathode of an X-ray tube. In one example, an emitter assembly comprises a first end of a substantially flat emitter supported by two rods extending from a two-rod insulator assembly, and a second end of the substantially flat emitter supported by a compliant, single rod insulator assembly.

An X-ray tube includes an envelope, a plate-shaped output window located at an end of the envelope, a target facing the output window inside the envelope, a tubular focusing electrode surrounding the target inside the envelope, and a filament surrounding the focusing electrode inside the envelope. A first line is defined to pass through a center of a surface of the output window at the target side and to be tangent to an end of the focusing electrode at the output window side; and a center of the filament is positioned at the same side of the first line as the focusing electrode.

An emitter, a field emission assembly, and an electromagnetic wave generator are provided, and the emitter is an emitter for emitting electrons in an electromagnetic wave generator and is in the form of a sheet in which a plurality of yarns including carbon nanotube (CNT) fibers are weaved.

An X-ray tube includes an envelope, a plate-shaped output window located at an end of the envelope, a target facing the output window inside the envelope, a tubular focusing electrode surrounding the target inside the envelope, and a filament surrounding the focusing electrode inside the envelope. A first line is defined to pass through a center of a surface of the output window at the target side and to be tangent to an end of the focusing electrode at the output window side; and a center of the filament is positioned at the same side of the first line as the focusing electrode.

The vacuum tube insert assembly includes a flared insert having an annular flange and a stem, each constructed from glass. The stem extends axially from the flange. The flange surrounds an outer periphery of a plug concavity defined by the stem. A feedthrough pin passes axially through the stem and is sealed to the stem. The pin terminates inside the concavity to form a plug. A socket connects to the plug within the concavity and includes a receptacle that removably couples to the pin, with an engagement feature preventing an incorrect plug-socket connection. The method includes axially inserting the pin through the stem in a fixed relative position such that the pin is disposed within the plug concavity, sealing the stem such that the stem is vacuum sealed to the pin, thereby forming a plug, and removably coupling a mating receptacle of the socket to the pin.

Various methods and systems are provided for an emitter assembly for a cathode (352) of an X-ray tube. In one example, an emitter assembly comprises a first end (426) of a substantially flat emitter (424) supported by two rods extending from a two-rod insulator assembly (420), and a second end (428) of the substantially flat emitter (424) supported by a compliant, single rod insulator assembly (414).

High-voltage connectors and cathode assemblies for x-ray tubes are disclosed. A cathode assembly for an x-ray tube can include a high-voltage shield surrounding a cathode structure and a ceramic plate. The ceramic plate can include a central recess to receive the cathode structure and a vacuum side defining a V-shaped profile radially extending from the central recess, the central recess being defined by a first ridge of the V-shaped profile. The cathode assembly can be configured to limit an electric field at a shortest distance between the vacuum side and the high-voltage shield to 13 MV / m.

To provide an X-ray tube that can ensure sufficient withstand voltage characteristics.SOLUTION: An x-ray tube comprises: a housing; an electron gun that emits an electron beam inside the housing; and a target that generates x-rays in response to receiving the electron beam inside the housing. The electron gun has: a cathode 32 that discharges electrons; and a second grid electrode 34 that focuses the electrons on the target 4 as the electron beam. The second grid electrode 34 is a cylinder that has an inside surface 51 and an outside surface 52. The inside surface 51 includes a first area R1, and a second area R2 that is positioned on the target side 4 with respect to the first area R1. An average roughness of the second area R2 is less than an average roughness of the first area R1.SELECTED DRAWING: Figure 3