Abstract: A heater for a hollow cathode and a method for manufacturing the heater for the hollow cathode are provided. An example heater includes a tube and a thickening located at an edge of the tube. The tube has a side wall of a predetermined thickness and a cut in the side wall. The thickening is configured for attaching two electrical current leads. The tube and the thickening are made of a carbon fiber composite.

Abstract: Electron emitters for x-ray tubes. In one example embodiment, an electron emitter for an x-ray tube includes an electron filament and a plurality of electrical leads. The electron filament defines a plurality of openings. Each lead is positioned so as to extend through one of the openings and each lead is mechanically and electrically connected to the filament proximate the opening without the presence of braze material.

Abstract: A steak tube 1 has a container 2 with an entrance plate 2a and an output plate 2b; a photocathode 7 disposed in the container 2 and configured to emit electrons according to light to be measured, the light having been incident through the entrance plate 2a; a mesh electrode 3, a first focusing electrode 4, and an aperture electrode 5 forming an axially symmetric electron lens for focusing the electrons emitted from the photocathode 7, toward the output plate 2b; a sweep electrode 6 disposed in the container 2 and configured to sweep the electrons focused by the axially symmetric electron lens, in a sweep direction along the output plate 2b; and a second focusing electrode 9 disposed between the entrance plate 2a and the output plated 2b and forming a one-dimensional electron lens for focusing the electrons in the sweep direction.

Abstract: A low-voltage, multi-beam, multi-MW RF source that operates at a voltage less than or equal to approximately 60 kV and generates at least one MW. The RF source includes a cathode configured to generate a plurality of beamlets. An input cavity and output cavity are common to the plurality of beamlets. A plurality of gain cavities are provided between the input and output cavities, each having a plurality of openings corresponding to the plurality of beamlets. The power source may further include a plurality of cathodes, each cathode generating a plurality of beamlets, wherein the input and output cavities are common to the plurality of beamlets from each of the plurality of cathodes, and a separate set of gain cavities are provided for each cathode. A single cathode version generates approximately 2.5 MW, and a four cathode version having four independent cavity systems and a common magnetic system generates approximately 10 MW.

Abstract: In an accelerating tube which uses a conductive insulator, there is a possibility that the dopant concentration on a surface of the conductive insulator becomes non-uniform so that the surface resistance of the conductive insulator becomes non-uniform. Accordingly, a circumferential groove is formed on the inner surface of the conductive insulator accelerating tube in plural stages, and metal is metalized along inner portions of the grooves. When the resistance of a specific portion on the surface of the accelerating tube differs from the resistance of an area around the specific portion, the potential of the metalized region on the inner surface of the accelerating tube becomes a fixed value and hence, the potential distribution on the inner surface of the accelerating tube in the vertical direction can be maintained substantially equal without regard to the circumferential direction.

Abstract: A multi-beam electron gun provides a plurality N of cathode assemblies comprising a cathode, anode, and focus electrode, each cathode assembly having a local cathode axis and also a central cathode point defined by the intersection of the local cathode axis with the emitting surface of the cathode. Each cathode is arranged with its central point positioned in a plane orthogonal to a device central axis, with each cathode central point an equal distance from the device axis and with an included angle of 360/N between each cathode central point.

Abstract: A high-definition CRT is provided having an electron gun to produce high beam current without increasing spot size and to provide lower electrical power requirements at high beam-modulation frequencies. The electron gun includes beam-forming electrodes and a lens. Each beam-forming electrode has several aperture clusters operable to form several collimated beams of electrons. In addition, the lens is operable to focus the several collimated beams of electrons onto a display screen.

Abstract: An active electronically steered cathode (AESC) applies one or more electromagnetic modes to an input cavity, similar to that used in an inductive output tube. The structure and superposition of these modes creates local electric field maxima, causing the electron emission site or sites to move or be distributed across the surface of the cathode. Changing the amplitude, phase, or frequency of the modes provides time-variable control of the electric field profile, thereby generating electronically steered electron beams. One embodiment employs a pair of orthogonal TM modes driven out of phase, causing the electric field maximum to rotate around an annular cathode, producing a helical beam. Slots in the control grid may be used to segment the helical beam into discrete bunches to provide additional density modulation.

Abstract: A fluorescent tube 30 of the present invention includes a glass tube 31 and electrodes 32 opposed to each other on both end portions 31a of the glass tube 31, characterized in that the electrode 32 has a closed-end hollow shape opened on the opposite side from the end portion 31a of the glass tube 31, and the electrode 32 constituting the closed-end hollow shape has an inner surface 35 configured to be tapered toward the end portion 31a of the glass tube 31. With this configuration, it is possible to contain accelerated electrons not only in the bottom face 33 of the electrode 32 but also in the inner surface 35 of the electrode 32, thereby suppressing sputtering. Consequently, it is possible to increase the life of the fluorescent tube 30.

Abstract: An electron tube includes a microwave structure, an electron gun having a cathode-wehnelt assembly, with axis for providing a linear electron beam along the same axis in a circular cylindrical passage with axis of the microwave structure, the cathode comprising a centre of rotation of the beam on the said axis of the cathode. The electron gun and the microwave structure each comprise portions of spherical surfaces in contact inscribed on one and the same sphere of radius centred on the centre of the cathode so as to form a swivel for angular adjustment of the axis of the cathode and to make the axis of the electron beam coincide with the axis of the circular cylindrical passage of the microwave structure. Applications include microwave electron tubes such as travelling wave tubes and klystrons.

Abstract: Deformation of a gate by Coulomb force generated when operating an electron-emitting device is inhibited by appropriately maintaining relationship between film thickness h of the gate and distance L from an outer surface of an insulating member to an inner surface of a concave portion. According to this, in an electron beam apparatus provided with a laminate-type electron-emitting device, the deformation of the gate is prevented to reduce variation in electron emission characteristics, thereby preventing the element from being broken.

Abstract: An indirectly heated cathode assembly is presented. The indirectly heated cathode assembly includes at least one electron source for generating a first electron beam, an emitter for producing a second electron beam when heated by the first electron beam and a focusing electrode for controlling, and directing the first electron beam towards the emitter.

Abstract: A high-definition CRT is provided having an electron gun to produce high beam current without increasing spot size and to provide lower electrical power requirements at high beam-modulation frequencies. The electron gun includes three electrodes having clusters of apertures to allow collimation of the electron beam from a cathode. The main lens is operated to focus a parallel beam of electrons on a display screen. Methods for manufacturing by mechanical or semiconductor methods are also provided.

Abstract: Systems and methods are provided for field emission device. An array of carbon nanotubes is arranged in a variable height distribution over a cathode substrate. An anode is provided to accelerate the emitted electrons toward an x-ray plate. Voltage is supplied across the array of carbon nanotubes to cause emission of electrons. The pointed height distribution may be linear or parabolic, and a peak height of the variable height distribution may occur in a center of the array. A side gate may also be provided adjacent the array of carbon nanotubes to provide improved electron emission and focusing control.

Abstract: Deformation of a gate by Coulomb force generated when operating an electron-emitting device is inhibited by appropriately maintaining relationship between film thickness h of the gate and distance L from an outer surface of an insulating member to an inner surface of a concave portion. According to this, in an electron beam apparatus provided with a laminate-type electron-emitting device, the deformation of the gate is prevented to reduce variation in electron emission characteristics, thereby preventing the element from being broken.

Abstract: In an image display apparatus having a plurality of electron emitting parts 12, in which a gate 4 and a cathode 6 are arranged in confrontation with each other, in an X-direction, electron beam control electrodes 13a and 13b are arranged, respectively on the external side of an electron emitting part 12 positioned at an end in the X-direction end portion, the electron beam control electrode 13a having the gate 4 arranged between it and the electron emitting parts 12 is connected to the cathode, and the electron beam control electrode 13b having the cathode 6 between it and the electron emitting parts 12 is connected to the gate 4, respectively.

Abstract: An electron beam apparatus is provided having an electron emitting device which has a simple configuration, exhibits high electron emission efficiency, operates stably, and in which emitted electrons are effectively converged. The electron beam apparatus includes: an insulator having a notch on its surface; a gate positioned on the surface of the insulator; at least one cathode having a protruding portion protruding from an edge of the notch toward the gate, and positioned on the surface of the insulator so that the protruding portion is opposed to the gate; and an anode arranged to be opposed to the protruding portion via the gate, wherein the gate is formed on the surface of the insulator so that at least a part of a region opposed to the cathode is projected outward and recessed portions are provided in which ends of the gate are recessed and interpose the projected region.

Abstract: The present invention relates to an alkali metal generating agent and others for formation of a photo-cathode or a secondary-electron emitting surface capable of stably generating an alkali metal. The alkali metal generating agent is used in formation of a photo-cathode for emitting a photoelectron corresponding to incident light, or in formation of a secondary-electron emitting surface for emitting secondary electrons corresponding to an incident electron. Particularly, the alkali metal generating agent contains at least an oxidizer comprising at least one vanadate with an alkali metal ion as a counter cation, and a reducer for reducing the ion. An alkali metal generating device comprises at least the alkali metal generating agent and a case housing it, and the case is provided with a discharge port for discharging the vapor of the alkali metal.

Abstract: A thermionic emission device includes an insulating substrate, and one or more grids located thereon. Each grid includes a first, second, third and fourth electrode down-leads located on the periphery thereof, and a thermionic electron emission unit therein. The first and second electrode down-leads are parallel to each other. The third and fourth electrode down-leads are parallel to each other. The first and second electrode down-leads are insulated from the third and fourth electrode down-leads. The thermionic electron emission unit includes a first electrode, a second electrode, and a thermionic electron emitter. The first electrode and the second electrode are separately located and electrically connected to the first electrode down-lead and the third electrode down-lead respectively. The insulating substrate comprises one or more recesses that further insulate the thermionic electron emitters from the substrate.

Abstract: An electron beam gun with an arched shaped beam former as an integral part of a massive cathode block which conducts heat away from the beam former and with a filament mounted to the cathode block for improved alignment.

Abstract: The present invention provides an electron source that can produce a stable electron beam even if an apparatus employing the electron source receives vibration from the outside. An electron source comprising an insulator, a pair of conductive terminals attached to the insulator, a filament tensed between the pair of conductive terminals, a rod-shaped cathode having a sharp end portion performing as an electron emitting portion and joined with the filament, wherein the cathode has another end portion different from the electron emitting portion, fixed to the insulator. It is preferred that said another end portion of the cathode other than the electron emitting portion, is fixed to the insulator via a metal pin brazed with the insulator.

Abstract: An insulator of an electron beam generator is placed in vacuum, and will be electrically charged upon bombardment of electrons on the surface thereof, whereby a high electrical field is generated. In addition, when fine impurity particles are present on the surface of the insulator, such fine particles will move due to electrostatic force. These could be a cause of electrical discharge, resulting in an unstable accelerating voltage of an electron beam. An electron beam generator is provided in which an electron beam is generated from a cathode upon application of a voltage across the cathode and an anode. An insulator placed in vacuum has a ceramic substrate and a low-resistivity film formed on the surface of the substrate. The electrical volume resistivity of the low-resistivity film is less than or equal to one-hundredth of that of the substrate (see FIG. 2).

Abstract: A method of producing a cathode for use in an x-ray tube assembly is provided including machining an emission aperture into a cup emission surface portion of a cup structure. The cup structure is comprised of a cup base portion opposite the cup emissions surface portion. Electro-discharge machining is used to form an electro-discharge machining slot into the cup structure to provide access to the interior of the cup structure. Electro-discharge machining is used to form a transverse coil chamber within the interior by way of the electro-discharge machining slot such that the transverse coil chamber is formed between the cup base portion and the cup emissions surface portion while retaining an essentially contiguous emissions surface perimeter surrounding the emission aperture.

Abstract: Cathode structure for cathode ray tube comprising an eyelet in two separate parts positioned such that one of the parts covers, in the longitudinal direction and at least partially, the second part. The two parts are linked to each other at the shouldered ends. This structure reduces the heat losses of the cathode and reduces its consumption while it is operating.

Abstract: A cathode ray tube has an electron gun oriented along an axis (Z), comprising a quadrupolar device which comprises three electrodes (5, 6, 7). Each electrode possesses a central aperture, a right lateral aperture and a left lateral aperture all three substantially rectangular. The centers (c5.1, c7.1) of the central apertures of the three electrodes are aligned along the axis (Z) of the gun. The centers (c6.1, c6.3) of the left and right lateral apertures of the second electrode (6) are situated along respectively a first axis (z1) and a second axis (z3) that are parallel to the axis (Z) of the gun. The centers (c5.1, c7.1) of the left and right lateral apertures (5.1, 5.3, 7.1, 7.3) of the first and/or of the third electrode (5,7) are offset with respect to the axes (z1, z3) passing through the centers of the apertures of the second electrode. Such an arrangement makes it possible to correct the MODEC defects.

Abstract: An in-line type electron gun using a field superimposing type main lens system is provided that can attain good focusing properties by decreasing the size of the electron beam spot on the entire surface of the phosphor screen without being formed to be mechanically large. A field superimposing type main lens is formed by disposing two tubular electrodes opposite to each other and disposing a plate-like field correction electrode on each of the tubular electrodes on the sides not opposite to each other. On each of the opposite sides of the two tubular electrodes, an opening is formed by an edge portion and a folded portion. The shape of the opening may be an elongated flat-sided oval shaped aperture (laterally elongated aperture) that is formed by straight lines and semicircles and has a major diameter in the horizontal direction and a minor diameter in the vertical direction.

Abstract: An electrode for an electron gun and an electron gun using same are provided which make use of stable carbon material having small work function and which permit orientation control to be achieved and which can be manufactured at a low cost. An electrode for an electron gun uses carbon electrode(s) formed from amorphous carbon and carbon nanotubes or carbon nanofibers and molded in linear shape. The carbon electrode is obtained by mixing a resin composition such as chlorinated vinyl chloride resin, furan resin, etc., which forms non-graphitizing carbon after carbonizing, with a carbon powder such as carbon nanotubes or carbon nanofibers and, after extrusion, molding and carbonizing the molding obtained.

Abstract: A cathode in an indirectly heated cathode ion source is supported by at least one rod or pin. The cathode is preferably in the form of a disk, and the support rod is smaller in diameter than the disk to limit thermal conduction and radiation. In one embodiment, the cathode is supported by a single rod at or near its center. The support rod may be held by a spring-action clamp for simple and reliable clamping and unclamping. The disk shaped cathode and the support rod may be fabricated as a single piece. A filament that emits electrons thermionically may be disposed around the rod in close proximity to the cathode.

Abstract: A cathode-ray tube has an electron gun with a main focusing lens, wherein each electrode comprises a rectangular aperture whose large dimension is along the horizontal axis (Ox) and terminating at its two ends in two identical semi-ellipses of order n that are symmetric with respect to the axis of the gun (Z).

Abstract: The present invention relates in general to a cathode ray tube, more particularly, to a structure of an electron gun for enhancing resolution of a cathode ray tube. The structure of an electron gun for a cathode ray tube of the invention is effective for enhancing the resolution of the screen without an application of a dynamic voltage.

Abstract: An electron gun for a color CRT includes a main focusing lens unit that focuses the electron beams generated by a triode unit. The main focusing lens unit includes a first and a second electrostatic screen grid having three electron beam through holes linearly-arranged for passing three electron beams, two of the holes being external and an oval shaped hole that passes all three electron beams. The oval shaped holes being spaced a distance, d1 and d2, respectively, from the through holes. Furthermore, the first grid external holes have an external distance HL1 and an internal distance HR1 and the second grid external holes have an external distance HL2 and an internal distance HR2; and wherein HL1 is greater than HR1, HL2 is greater than HR2, d1 is greater than d2, HL2 is greater than HL1, and HL2+HR2 is greater than HL1+HR1.

Abstract: An electron gun assembly that emits three electron beams, which are arranged in line, toward a phosphor screen includes three cathodes arranged in line, three first grids arranged to face the associated cathodes, and a second grid with an integral structure that is disposed to face a phosphor screen side of the first grids. Each of the first grids is formed of a cup-shaped electrode body having an electron beam passage hole. The electron gun assembly further includes an insulation member through which the three first grids penetrate, the insulation member thus integrally holding the three first grids, a cylindrical member that surrounds the insulation member and has an implant part, and an insulating support member that supports the implant part of the cylindrical member.

Abstract: The indirectly heated cathode structure includes a base metal having a thermal electron emitting material layer, a cylindrical sleeve holding the base metal at one end portion thereof and housing a heating heater in the inside thereof, an support having a large-diameter portion and g a small-diameter portion, and a cathode disc having a large-diameter portion at the leg-portion-side of the heating heater and having a small-diameter portion at the heater-main-portion side of the heating heater, wherein an outer surface of another end portion of the sleeve and an inner surface of the small-diameter portion of the support are fixed to each other, and an outer surface of the large-diameter portion of the support and an inner surface of the small-diameter portion of the cathode disc are fixed to each other.

Abstract: Low-cost electron emission device and field emission display using a cold cathode electron source having a high electron beam utilization efficiency and capable of controlling the spread of the electron beam. Under the condition Ea?Eg, the electric field strength near the gate electrode forming an electron emission control unit is varied between a central portion and a peripheral portion in the plane of a single pixel (or sub-pixel), thereby controlling the spread of the electron beam. A device using a field emission-type electron source array capable of achieving a high emission current density at low voltage can be realized at low cost.

Abstract: Axially symmetric magnetic fields are provided about the longitudinal axis of each beam of a multi-beam electron beam device. The magnetic field symmetry is independent of beam voltage, beam current and applied magnetic field strength. A flux equalizer assembly is disposed between the cathodes and the anodes and near the cathodes of a multi-beam electron beam device. The assembly includes a ferromagnetic flux plate completely contained within the magnetic focusing circuit of the device. The flux plate includes apertures for each beam of the multi-beam device. A flux equalization gap or gaps are disposed in the flux plate to provide a perturbation in the magnetic field in the flux plate which counters the asymmetry induced by the off-axis position of the beam. The gaps may be implemented in a number of ways all of which have the effect of producing a locally continuously varying reluctance that locally counters the magnetic field asymmetry.

Abstract: A cathode sleeve structure for housing a heater. The cathode sleeve structure includes: a case member that is cylindrical and an end thereof is open; a plurality of supporting members that extend radially from vicinities of the end of the case member; and a linkage member that connects the plurality of supporting members. The case member, the plurality of supporting members, and the linkage member are formed as one piece.

Abstract: A cathode structure for an electron gun of a cathode-ray tube having a reduced size and providing a fast cathode start-up time and excellent thermal efficiency. The cathode comprises a closed chamber consisting of a cap supporting an emitting part of the cathode and a dish-shaped skirt having an internal surface which is concave so as to reflect, by radiation, the thermal energy stored in the skirt walls, towards that region of the cap supporting the emitting part. The cathode structure also comprises filament supply leads which pass through the side walls of the skirt and connect to the filament heater contained in the closed chamber.

Abstract: The present invention is to provide an electron gun of a monochromic CRT comprising at least two electron emission sources (e.g., cathodes) for emitting beams having a small beam spot size and being adapted to impinge on the same spot of a screen of the monochromic CRT after having been focused by a focusing lens or common lens in the electron gun. As an end, the resolution, focusing quality and brightness of the screen of the monochromic CRT are improved.

Abstract: The CRT device comprises a cold cathode electron gun that includes cathodes, a peripheral focusing electrode, and an accelerating electrode. The cathode has a structure in which an emitter electrode and a gate electrode are joined together with an insulating layer interposed therebetween. The electric potential difference from the emitter electrode is 60V for the gate electrode, 0V for the peripheral focusing electrode, and 4.6 kV for the accelerating electrode.

Abstract: Cathode comprising a substrate (2) supporting a cathode emissive coating, comprising what is called an emissive central zone (12) and what is called a nonemissive peripheral zone (11); according to the invention: the average density and the emissive zone (12) is greater than that in said nonemissive zone (11), the average thickness in the emissive zone (12) is less than that in the nonemissive zone (11). In this way it is possible to significantly limit the drift in cut-off voltage, while still maintaining good maximum emission performance in DC mode and in pulse mode.

Abstract: An electron gun for a monochrome cathode ray tube to be used in a projection display device includes a cathode for emitting thermal electrons, and first and second electrodes forming a triode portion together with the cathode. A third electrode is adjacent the second electrode. A fourth electrode is adjacent the third electrode to receive a focus voltage. A fifth electrode partially surrounds the fourth electrode while being adjacent the fourth electrode to receive an anode voltage together with the third electrode. The second electrode has a bottom portion with a stepped portion surrounding a hole for guiding the electron beams while being protruded toward the first electrode, and a sidewall portion extended from the periphery of the bottom portion toward the third electrode. The first and the second electrodes are structured to satisfy the following condition: 0.54?T/G?1.

Abstract: An electron gun includes an electron emission cathode, a control electrode, and an extractor and the electron emission cathode is made of rare earth hexaboride. A tip of the electron emission cathode is located between the control electrode and the extractor, and the electron emission surface of the electron emission cathode is spherical or flat.

Abstract: A cathode assembly includes an insulation member, three holders arranged inline in the insulation member, and a support member having a rim portion in which the insulation member is inserted and supported. When a thickness of the insulation member is D millimeters (mm) and a height of the support member is F millimeters (mm), values of D and F are set to satisfy the following inequality: F/D<170%.

Abstract: An electron source includes a vacuum chamber within which a vacuum is maintained by a vacuum pump. An insulated receptacle is mounted within the vacuum chamber and has a receptacle mounting flange. The receptacle mounting flange is used to establish a coordinate system having an electron beam axis and a lateral plane, wherein the lateral plane is transverse to the electron beam axis. An adapter is mounted to the receptacle and is adjustable in five degrees of freedom with respect to the coordinate system. A cathode and focus electrode are adjustable in at least four degrees of freedom and are pre-aligned with respect to one another prior to being installed on the adapter. An anode is mounted in the vacuum chamber and is aligned at a predetermined distance from the cathode with respect to the coordinate system.

Abstract: This invention provides a multielectron gun which generates a plurality of electron beams having uniform characteristics. A multielectron gun (2) is formed of a plurality of electron guns (2a-2c). The electron gun (2a) has, in addition to an electron source (21a), Wehnelt electrode (22a), and anode electrode (23), a shield electrode (24) between the Wehnelt electrode (22a) and anode electrode (23). The shield electrode reduces field interference among the electron guns.

Abstract: Color CRTs, used in large display screens, have a plurality of three color electron beams that are strongly focused so that they crossover and become divergent in both the X and Y axes if the CTR's face. The strength of the focusing determines the size of the illuminated area on the face of the CRT. A shadow mask, aperture grill, or slotted mask and the red, green and blue phosphor dots or stripes are located at predetermined positions such that the red electron beams only hit the red phosphors, the green electron beams only hit the green phosphors, and the blue electron beams only hit the blue phosphors. No raster scanning with the electron beams are required.

Abstract: Axially symmetric magnetic fields are provided about the longitudinal axis of each beam of a multi-beam electron beam device. The magnetic field symmetry is independent of beam voltage, beam current and applied magnetic field strength. A flux equalizer assembly is disposed between the cathodes and the anodes and near the cathodes of a multi-beam electron beam device. The assembly includes a ferromagnetic flux plate completely contained within the magnetic focusing circuit of the device. The flux plate includes apertures for each beam of the multi-beam device. A flux equalization gap or gaps are disposed in the flux plate to provide a perturbation in the magnetic field in the flux plate which counters the asymmetry induced by the off-axis position of the beam. The gaps may be implemented in a number of ways all of which have the effect of producing a locally continuously varying reluctance that locally counters the magnetic field asymmetry.

Abstract: An electron gun for a cathode-ray tube comprises a dish-shaped control electrode. The electrode is made from three separate components: a substantially plane component drilled with apertures so as to allow the passage of electron beams, and two identically shaped components intended to make a skirt, serving as support for the cathode modules. The three components are welded together. This structure allows the construction of a control electrode serving as support for cathode modules by virtue of inexpensive components that are simple to manufacture.

Abstract: A transfer film comprising a base film (11), a parting-agent layer (12), a protective film (13), and a metal film (14), the latter three being formed on the base film (11) in order, wherein the protective film (13) contains a softening agent such as a phosphate, an aliphatic monobasic acid ester, an aliphatic dibasic acid ester, or a dihydric alcohol ester. By using such a transfer film, a metal back layer is formed. Since the transfer layer of the transfer film has a surface resistivity of as high as 102-108 ?/, the surface resistivity of the formed metal back layer is high, and discharge is suppressed.

Abstract: In a control grid for an electron tube, the grid has first bars that are evenly spaced out on a skewed surface and extend substantially as circle pseudo-involutes about a central hub.