57results about "Cathode ray tubes/electron beam tubes" patented technology

1. A method for controlling a density distribution of electrons provided by an electron source for use in hard x-ray, soft x-ray and / or extreme ultraviolet generation, the method comprising: generating a plurality of electrons from a pattern of ultra-cold excited atoms inside a cavity using an ionizing laser, the electrons having a density distribution determined by at least one of the pattern of excited atoms and the ionizing laser; and accelerating the electrons exiting the cavity using a non-static acceleration profile, the acceleration profile controlling the density distribution of the electrons as they exit the cavity.

An object of the disclosure is to provide an insulator capable of shortening conditioning time and reducing withstand voltage failure when a voltage difference between electrodes is approximately several tens of kV. The insulator according to the disclosure includes an insulating material portion and a glass layer, and a boundary between the insulating material portion and an end portion of a cathode on a side facing an anode is covered with the glass layer.

Charged-particle beam (CPB) optical systems can include a beam acceptance aperture plate defining a first acceptance aperture and at least one second acceptance aperture, situated with respect to a CPB source so that a first CPB is transmitted by the first acceptance aperture and a second CPB is transmitted by a second acceptance aperture. A CPB lens is situated to receive the first and second CPBs from the beam acceptance aperture plate and direct the first and second CPBs towards a filter aperture plate to transmit selected spectral portion of the second CPB. The selected spectral component of the first CPB can be selectively directed to a workpiece by a beam steering deflector along the same axis. In some examples, the first and second CPBs have different beam currents and only one is directed to a workpiece.

Electron source (2) for generating an electron beam (8) with a cathode (1) and an anode (4) arranged on the same silicon carbide substrate (5), wherein the cathode (1) has a graphene layer (12) arranged directly on the same substrate (5), characterized in that the electron source (2) has an acceleration section between the cathode and the anode to extract electrons from the cathode due to an electrical potential difference between the cathode and the anode and to accelerate them from the cathode towards the anode, wherein the potential difference is greater than 1 kV.

The invention discloses a high-adhesion anode fluorescent screen and a manufacturing method thereof, and relates to the technical field of low-light-level image intensifier core component manufacturing, the high-adhesion anode fluorescent screen comprises a fluorescent screen, the fluorescent screen is made of glass or a sapphire substrate, the fluorescent screen is provided with a micropore array structure, the micropore array structure comprises a plurality of micropores arranged in an array, the aperture of each micropore is 5-10 [mu] m, and the diameter of each micropore is 5-10 [mu] m. The hole depth is 3-5 microns, the hole pitch is 1-2 microns, fluorescent powder is filled in each micropore, and the fluorescent powder is made of P43 or P45 fluorescent powder. According to the invention, the micropore array can form an anchoring structure, the fluorescent powder slurry is coated, the holes are filled with the particles and the binder, and the fluorescent powder layer and the substrate are locked; the stripping tendency of the fluorescent powder layer caused by thermal expansion and cold contraction, vibration or external stress is resisted through geometric constraint, and interaction force is generated with internal stress of the fluorescent powder layer, so that adhesion is enhanced; a narrow-band efficient fluorescent material is selected to cooperate with the micropore light regulation effect, the efficient light-emitting characteristic of the fluorescent powder is enhanced, a mature manufacturing process combination is combined, and breakthrough improvement of the performance of the fluorescent screen is achieved.

Indolo[3.2.1-jk]carbazole-6-carbonitrile derivatives of the formula (I) as blue fluorescent emitters in organic electroluminescent devices, more particularly OLEDs.

Embodiments include an apparatus, comprising: a conductive base; an insulating substrate; an electron emitter disposed on the insulating substrate; a grid disposed adjacent to the electron emitter, the grid including a first conductive side and a second conductive side separate from the first conductive side; a plurality of posts; wherein: the first conductive side is attached to the insulating substrate through a first group of the posts; the second conductive side is attached to the insulating substrate through a second group of the posts; and the conductive base is attached to the insulating substrate through a third group of the posts.

A phosphor in which at least some of an element M in a phosphor host crystal represented by Mα(L, A)βXγ is substituted with Eu as an activation material. M represents one or more (including at least Sr) of Mg, Ca, Sr, Ba, and Zn, L represents one or more of Li, Na, and K, A represents one or more of Al, Ga, B, In, Sc, Y, La, and Si, X represents one or more (except that X represents only N) of O, N, F, and Cl, α, β, γ, and δ satisfy 8.70≤α+β+γ+δ≤9.30, 0.00<α≤1.30, 3.70≤β≤4.30, 3.70≤γ≤4.30, and 0.00<δ≤1.30. In a fluorescence spectrum obtained by irradiation with light having a wavelength of 260 nm, when a fluorescence intensity at a wavelength of 569 nm is represented by I0 and a fluorescence intensity at a wavelength of 617 nm is represented by I1, I1 / I0 is 0.01 or more and 0.4 or less.

The invention discloses a super second-generation image intensifier tube based on a cold indium seal structure and a preparation method thereof, and the super second-generation image intensifier tube comprises a polyalkali photoelectric cathode assembly, a metal ceramic tube shell, an indium layer, a fixed ring, a micro-channel plate, an air suction wire, and a fluorescent screen. The metal ceramic tube shell comprises an upper sealing ring, a straight ceramic ring I, a sealing ring I, a straight ceramic ring II, a sealing ring II, a straight ceramic ring III, a sealing ring III, a straight ceramic ring IV and an isolating ring; the indium layer is melted in the upper sealing ring through a vacuum indium process; the air suction wire is arranged between the third sealing ring and the isolating ring in a spot welding mode. The preparation method comprises the steps of polyalkali photoelectric cathode manufacturing, tube shell assembly processing, cold pressing indium sealing and sampling. According to the invention, the preparation of the super-second-generation image enhancement tube is decomposed into different ultrahigh vacuum chambers, so that the mutual interference among the processing processes of all parts is effectively avoided, the processes of photoelectric cathode assembly manufacturing, tube shell assembly processing and indium sealing integration are optimized to the greatest extent, and the performance of the device is improved.

The embodiment of the present application relates to a fluorescent screen, comprising: a fluorescent screen part; a first structure layer, the first structure layer is arranged on the fluorescent screen part; the first structure layer comprises a fluorescent powder layer and a filling oxide; the fluorescent powder layer comprises fluorescent powder and bonding oxide, the bonding oxide is used for bonding together between the particles of the fluorescent powder and the surface of the fluorescent screen part; the filling oxide is inorganic material; at least part of the filling oxide is filled in the internal pore of the fluorescent powder layer.

The utility model discloses a CRT (Cathode Ray Tube) graphic display device, which relates to the field of electronic equipment and comprises a device shell, a CRT imaging device is arranged in the device shell, a cooling device is arranged around the CRT imaging device, the imaging device comprises a kinescope, one end of the kinescope is provided with a display surface, and one end of the kinescope far away from the display surface is provided with a data connection port. And the data connection port extends out of the device shell. The efficient cooling device is integrated in the device shell, the device not only comprises the fixing plate attached to the outer surface of the kinescope and the heat dissipation outer ring surrounding the data connection port, but also realizes liquid cooling circulation through the infusion tube and the through groove, so that the temperature around the kinescope and the data connection port is effectively reduced, and meanwhile, the heat dissipation effect of the kinescope and the data connection port is improved. And through the design of mechanical structures such as the sliding blocks and the connecting rods, flexible adjustment and stable supporting of the heat dissipation outer ring are achieved, the heat dissipation efficiency is improved, and the stability of the structure is enhanced.

Described herein are systems and methods for positioning a radiation source with respect to one or more regions of interest in a coordinate system. Such systems and methods may be used in emission guided radiation therapy (EGRT) for the localized delivery of radiation to one or more patient tumor regions. These systems comprise a gantry movable about a patient area, where a plurality of positron emission detectors, a radiation source are arranged movably on the gantry, and a controller. The controller is configured to identify a coincident positron annihilation emission path and to position the radiation source to apply a radiation beam along the identified emission path. The systems and methods described herein can be used alone or in conjunction with surgery, chemotherapy, and / or brachytherapy for the treatment of tumors.

A method of operating a charged particle gun (102) is described. The method includes: providing an emitter (122) at a first emitter potential within the charged particle gun, and providing a capture electrode (142) at a first electrode potential within the charged particle gun, wherein the first emitter potential and the first electrode potential are configured to have a substantially zero electric field at the emitter and at the capture electrode; switching the capture electrode from the first electrode potential to a second electrode potential different from the first electrode potential to generate an electrostatic capture field at the capture electrode; and after switching the capture electrode from the first electrode potential to the second electrode potential, turning on the electrostatic emission field at the emitter.

SOLUTION: Charged-particle beam (CPB) optical systems can include a beam acceptance aperture plate defining a first acceptance aperture and at least one second acceptance aperture, situated with respect to a CPB source so that a first CPB is transmitted by the first acceptance aperture and a second CPB is transmitted by a second acceptance aperture. A CPB lens is situated to receive the first and second CPBs from the beam acceptance aperture plate and direct the first and second CPBs towards a filter aperture plate to transmit a selected spectral portion of the second CPB.EFFECT: The selected spectral component of the first CPB can be selectively directed to a workpiece by a beam steering deflector along the same axis. In some examples, the first and second CPBs have different beam currents, and only one is directed to a workpiece.SELECTED DRAWING: Figure 1A

The invention relates to a device for applying accelerated electrons to fluids and the inner walls of hollow bodies, comprising a cylindrical electron exit window (102) as part of a cylindrical housing (101) having a cylindrical axis (103) and enclosing an evacuable space; at least one wire-shaped, strand-shaped, rod-shaped, annular, helical, or cylindrical cathode (104a) arranged within the evacuable space and enclosed by the cylindrical electron exit window (102) and by a cylindrical control grid (104b), wherein the cylindrical control grid (104b) has a diameter smaller than the diameter of the cylindrical electron exit window (102), and wherein a first power supply device is electrically conductive between the wire-shaped, strand-shaped, rod-shaped, annular,a helical or cylindrical cathode (104a) and the cylindrical electron exit window (102) is connected, such that electrons can be emitted from the wire-shaped, strand-shaped, rod-shaped, ring-shaped, helical or cylindrical cathode (104a) and accelerated radially away from the cylinder axis (103) of the cylindrical housing (101) in the direction of the cylindrical electron exit window (102), wherein , a) a first hollow cylinder (107; 307) encloses the cylindrical electron exit window (102) and the first hollow cylinder (107; 307) and the electron exit window (102) are spaced apart from each other, so that a first annular free space is formed between the first hollow cylinder (107; 307) and the electron exit window (102); b) The first support elements (105) of the cylindrical control grid (104b) and the second support elements (106) of the concentrically arranged cylindrical electron exit window (102) run centrally symmetrically to each other along the respective lateral surfaces and are arranged azimuthally within equal angular segments with an angle ω.

Embodiments include an apparatus, comprising: a conductive base; an insulating substrate; an electron emitter disposed on the insulating substrate; a grid disposed adjacent to the electron emitter, the grid including a first conductive side and a second conductive side separate from the first conductive side; a plurality of posts; wherein: the first conductive side is attached to the insulating substrate through a first group of the posts; the second conductive side is attached to the insulating substrate through a second group of the posts; and the conductive base is attached to the insulating substrate through a third group of the posts.

A photocathode epitaxial structure. The photocathode epitaxial structure includes an improved substrate stack. The improved substrate stack includes a GaAs substrate and one or more additional layers formed on the GaAs substrate. The one or more additional layers are configured to provide an improved substrate stack surface with predetermined characteristics for forming a semiconductor device on the improved substrate stack surface. The photocathode epitaxial structure further includes an InGaAs p-type photocathode formed on the improved substrate stack surface. The InGaAs p-type photocathode has a predetermined percentage of In.

A night vision system along with an image intensifier tube having a microchannel plate and method of forming the microchannel plate are provided. The microchannel plate comprises a plurality of spaced channels extending through the microchannel plate, wherein each channel sidewall surface near the input face of the microchannel plate comprises a series of layers formed thereon. The input face of the microchannel plate, as well as the sidewall surfaces of each channel near the input surfaces, are configured with an electron backscatter layer arranged between a contact metal layer and a secondary electron booster layer. When formed partially into the channel openings near the input face, the electron backscatter layer and overlying secondary electron booster layer are configured circumferentially around the sidewall surfaces and extend radially inward toward a central axis of each channel.

Charged-particle beam (CPB) optical systems can include a beam acceptance aperture plate defining a first acceptance aperture and at least one second acceptance aperture, situated with respect to a CPB source so that a first CPB is transmitted by the first acceptance aperture and a second CPB is transmitted by a second acceptance aperture. A CPB lens is situated to receive the first and second CPBs from the beam acceptance aperture plate and direct the first and second CPBs towards a filter aperture plate to transmit selected spectral portion of the second CPB. The selected spectral component of the first CPB can be selectively directed to a workpiece by a beam steering deflector along the same axis. In some examples, the first and second CPBs have different beam currents and only one is directed to a workpiece.

A plasma chamber for a UV light source includes a plasma generation region defining a plasma confinement region. A port that allows generated light to be transmitted out of the chamber is positioned adjacent a side of the plasma generation region. A high voltage region is coupled to the plasma generation region. A ground region is coupled to the high voltage region, the ground region defining an outer surface configured to be coupled to ground and dimensioned to receive an enclosing inductor core. A width of the high voltage region is greater than a width of the ground region.

The creation of virtual particles is advantageous due to the high density of allowed energy states in a vacuum, but is a hindrance due to the relatively small number of allowed states in a normal metallic conductor. This difference can be exploited to create a highly efficient electrical energy generator, which is the object of the present invention.SOLUTION: In an electric energy generating device formed of a conductive hollow casing 2 which is made of metal or quartz containing a conductor and connected to a power source 8 for driving an electron gun 30 made of tungsten-hafnium alloy and in which a grid 25 is provided on the electron gun 30, electrons hit a target on the opposite side, and a magnet 4 makes the electrons linearly run toward the target. The housing 2 is grounded until the hollow is saturated, and when saturated, the MOSFET12 prevents the electrons from going to the ground, and a diode 9 guides the electrons to a capacitor 10 and from the capacitor 10 to a load.SELECTED DRAWING: Figure 1

The present invention relates to a photocathode for a vacuum system, wherein the photocathode is configured to receive electromagnetic radiation having an incident wavelength and to emit electrons in response thereto. The photocathode comprises a conductive structure having a geometry, the geometry comprising a tip portion. The tip portion is adapted to provide a field enhancement β when the conductive structure is illuminated with electromagnetic radiation, wherein β is greater than about 10 2 . The photocathode further comprises a substrate, the substrate being or comprising a dielectric substrate, the substrate supporting the conductive structure.

To provide an electron gun that can prevent peeling of insulating material on a surface of a filament, an X-ray tube, an inspection device, and a method for manufacturing an electron gun.SOLUTION: An electron gun comprises: a housing that exhibits a cylindrical shape; a first stem pin that is provided inside the housing on a side of a first end; a focusing electrode that is provided inside the housing on a side of a second end opposite to the side of the first end; an indirectly heated cathode that is provided on the focusing electrode; a first end that is provided on a side of the focusing electrode provided with the indirectly heated cathode with an insulating part therebetween; a tab that is electrically connected to the first end and a lead of a heater provided on the indirectly heated cathode; and a first lead wire that is provided inside the housing, electrically connected to the first stem pin on a side of one end, and electrically connected to the first end on a side of the other end.SELECTED DRAWING: Figure 1

The disclosure relates to minimization and energy extension of Coulomb interactions in focused ion beam (FIB) systems. A charged particle beam (CPB) optical system may include a beam acceptance aperture plate defining a first acceptance aperture and at least one second acceptance aperture, the beam acceptance aperture plate positioned relative to a CPB source such that a first CPB is transmitted by the first acceptance aperture and a second CPB is transmitted by the second acceptance aperture. The CPB lens is positioned to receive the first CPB and the second CPB from the beam receiving aperture plate and to direct the first CPB and the second CPB toward the filter aperture plate to transmit a selected spectral portion of the second CPB. Selected spectral components of the first CPB may be selectively directed to the workpiece along the same axis by a beam steering deflector. In some examples, the first CPB and the second CPB have different beam currents, and only one is directed to the workpiece.

The present disclosure presents systems and methods for performing direct patterning of a material on a substrate with high fidelity relative to a desired pattern. The aperture pattern of the shading mask is compensated to accommodate a range of propagation angles in a vapor plume for deposition of material onto the substrate through the shading mask. A shading mask according to the present disclosure includes a pattern of apertures in which an aperture location is shifted inward toward a center of the shading mask by an amount based on a distance of an aperture from the center of the shading mask. As a result, the evaporated material passing through the aperture at an illegal directional angle is deposited onto the substrate at its appropriate desired location.

A plasma chamber for a UV light source includes a plasma generation region defining a plasma confinement region. A port that allows generated light to be transmitted out of the chamber is positioned adjacent a side of the plasma generation region. A high voltage region is coupled to the plasma generation region. A ground region is coupled to the high voltage region, the ground region defining an outer surface configured to be coupled to ground and dimensioned to receive an enclosing inductor core. A width of the high voltage region is greater than a width of the ground region.