41results about "X-ray tube electrical arrangements" patented technology

An x-ray system is disclosed that includes a bipolar x-ray tube. The bipolar x-ray tube includes two insulators that are separated by an intermediate electrode in an embodiment, wherein each insulator forms a portion of an outer wall of a vacuum envelope of the bipolar x-ray tube surrounding at least a portion of a path of an electron beam within the vacuum envelope. In further embodiments, the bipolar x-ray tube includes a first electrode at a positive high voltage potential with respect to a reference potential, a second electrode at a negative high voltage potential with respect to the reference potential, and an x-ray transmissive window that is at the positive high voltage potential.

An field emitter array system (10) includes a housing (50). An emitter array (80) generates an electron beam and has multiple emitter elements (81) that are disposed within the housing (50). Each of the emitter elements has multiple activation connections (92).

In a miniature x-ray tube, which may be on the order of approximately 1 mm in diameter or even less, a high voltage cable is provided in various embodiments for conducting current to the cathode of the x-ray tube and for conducting high voltage to the cathode and anode of the tube. In various embodiments of the cable, two conductors occupy a center region of the cable, packed as closely together as possible, in various shapes that are compact and present as smooth as possible an external shape for maximizing dielectric properties against the exterior high voltage ground, surrounding and generally concentric with the inner conductors. The inner conductors, which carry high voltage in opposition to the outer ground, can be in opposed D shapes, coaxial, two flattened conductors side by side, or simply a pair of cylindrical wires positioned as closely as possible. The space between the inner conductors and the outer ground can be occupied by a glass insulator, polymer, successive layers of polymers and adhesive, air, gas, vacuum or other dielectrics. A partially conductive region can surround the inner conductors.

Systems, methods, and devices with improved electrode configuration for downhole nuclear radiation generators are provided. For example, one embodiment of a nuclear radiation generator capable of downhole operation may include a charged particle source, a target material, and an acceleration column between the charged particle source and the target material. The acceleration column may include an intermediate electrode that remains floating at a variable potential, being electrically isolated from the rest of the acceleration column.

The invention provides an external thermionic cathode distributed X-ray device, comprising a vacuum box which is sealed all around and is highly vacuum inside, a plurality of electronic emission units, an anode, and a power and control system. Each electronic emission unit is independent to each other and the electronic emission units are arranged in a linear array and are installed on the side wall of the vacuum box. The anode is installed in the middle part of the vacuum box. On the length direction, the anode is parallel to the arrangement line of the electronic emission units, and on the width direction, an included angle in a preset angle is between the anode and the installation plane of the electronic emission units. The power and control system is provided with a high-voltage power supply, a focusing power supply, an emission control device and a control system. The electronic emission unit is provided with a heating filament, a cathode connected with the heating filament, an insulating support piece which surrounds the cathode and a filament, a focusing electrode which is configured on the top end of the insulating support piece in a manner of being above the cathode, and a connecting fixing piece which is configured above the focusing electrode and is connected with the box wall of the vacuum box in a sealed manner. The filament lead passes through the insulating support piece and is connected with the emission control device.

In one embodiment, an X-ray tube is provided. The X-ray tube comprises at least one thermionic cathode configured to generate an electron beam, a target assembly configured to generate X-rays when impinged with the electron beam emitted from the thermionic cathode, a high voltage supply unit for establishing an output voltage across the thermionic cathode and the target assembly for establishing an accelerating electric field between the thermionic cathode and the target assembly and a mesh grid disposed between the thermionic cathode and the target assembly, the mesh grid configured to operate at a voltage so as to lower the electric field applied at the surface of the thermionic cathode. Further, the voltage at the mesh grid is negatively biased with respect to the voltage at the thermionic cathode.

A high frequency X-ray generator includes an anode voltage generator, a cathode voltage generator and a X-ray tube. The anode voltage generator is configured to generate a first high voltage. The cathode voltage generator is configured to generate a second high voltage having a same waveform as the first high voltage. The second high voltage has a different phase by 180 degrees compared to the first high voltage. The X-ray tube is configured to generate a X-ray by the first high voltage and the second high voltage. The first high voltage is applied through an anode terminal. The second high voltage is applied through a cathode terminal.

A transmissive-type target includes a target layer, and a transmissive substrate configured to support the target layer. The transmissive substrate has a pair of surfaces facing each other and is formed of polycrystalline diamond. In the transmissive substrate, one of the pair of surfaces includes polycrystalline diamond having a first average crystal grain diameter which is smaller than a second average crystal grain diameter of polycrystalline diamond included on the other surface opposing thereto. The target layer is supported by any one of the pair of surfaces.

The invention discloses an anode target, a ray light source, computed tomography equipment and an imaging method thereof, and relates to the technical field of ray processing. The anode target comprises a first anode target, a second anode target and a ceramic plate, wherein the first anode target is used for enabling an electron beam emitted by a cathode to generate a first ray on a target spot of the first anode target through first voltage carried on the first anode target; the second anode target is used for enabling an electron beam emitted by the cathode to generate a second tray on a target spot of the second anode target through second voltage carried on the second anode target; and the ceramic plate is used for isolating the first anode target and the second anode target. The anode target, the ray light source, the computed tomography equipment and the imaging method thereof can provide dual-energy distributed ray imaging data and improve the imaging quality of a ray system.

The invention provides an X-ray tube device. In an embodiment, the X-ray tube device comprises an outer barrel assembly (10), an anode end cover assembly (20), a cathode end cover assembly (30) and a spring needle connection assembly (40), wherein the outer barrel assembly (10) is provided with an anode end (120) and a cathode end (130); the anode end cover assembly (20) is arranged at the anode end of the outer barrel assembly and comprises an X-ray tube (202); the cathode end cover assembly (30) is arranged at the cathode end of the outer barrel assembly and comprises a high-voltage socket (320) to be externally connected with a power supply; and the spring needle connection assembly (40) is arranged in the outer barrel assembly and a lamp filament lead of an X-ray tube is connected to the high-voltage socket. The invention further provides a spring needle for the X-ray tube device. According to the closed X-ray tube device and the spring needle provided by the invention, the structure is simplified, operation is stable and the conductive effect is reliable.

Disclosed is a portable X-ray generation device, which uses an electric field emission X-ray source, and is thus advantageous in reducing weight and volume and has excellent reliability in X-ray emission performance. The portable X-ray generation device according to the present invention includes an electric field emission X-ray source, which includes a cathode electrode having an electron emitter, an anode electrode having an X-ray target surface, and a gate electrode between the cathode electrode and the anode electrode; and a driving signal generator configured to generate at least three driving signals applied to the cathode electrode, the anode electrode, and the gate electrode, respectively, by direct current power having a predetermined voltage, wherein the driving signal generator includes a current controller maintaining a tube current between the anode electrode and the cathode electrode to have a constant value during X-ray emission.

An X-ray generating tube includes: an anode including a target and an anode member electrically connected to the target; a cathode including an electron emitting source and a cathode member electrically connected to the electron emitting source; and an insulating tube joined at one end to the anode member and joined at the other end to the cathode member so that the target and the electron emitting portion face each other, in which an inner circumferential conductive film is formed on an inner surface of the insulating tube; an end surface conductive film extends from one edge of the inner circumferential conductive film on the one end side onto a surface of the one end of the insulating tube; and the end surface conductive film is sandwiched between the end surface and the anode member to be electrically connected to the anode member.

According to one embodiment, an X-ray tube includes a vacuum envelope (15), an anode and a cathode structure (31), which are provided opposite to each other in the envelope. The cathode structure includes a cathode (32) and an insulator (33) which supports the cathode and is attached to the vacuum envelope. The insulator includes a basal portion (39) attached to the vacuum envelope, a support portion (40) which supports the cathode at a distal end projecting from the basal portion, and a tubular projection portion (41) which is provided to project from the basal portion and opposite to a periphery of the support portion.