Abstract: A compact magnet system for use in a high-power microwave tube includes an electromagnetic coil surrounded on three sides by permanent magnets. More particularly, constituent components include a first tubular retaining member; the electromagnetic coil that fits within the first tubular retaining member and that has a central cavity; first permanent magnets positioned to extend radially from the central cavity so that like poles of the first permanent magnets wrap around the central cavity along a first side of the solenoid coil; and second permanent magnets positioned to extend radially from the central cavity so that opposite poles to the first permanent magnets wrap around the central axis along the second side of the solenoid coil. Optional added components include two sets of permanent magnets, one set on each side of the coil and a pole piece located adjacent to an end of the first tubular retaining member.

Abstract: In an electron gun for use in a TWT, klystron, linear accelerator or other electron device, an electron gun header assembly and an input body assembly are coupled using a flexible bellows that allows the distance between the cathode and anode to be varied. As such, the perveance of the electron gun can be tuned, and the cathode magnetic field optimized for efficient operation. In addition, an external magnetic shield is adapted to be translated along the axial dimension of the electron gun to further optimize the cathode magnetic field and focusing characteristics to achieve improved electron gun performance.

Abstract: A lighting tube provides a path from the anode to the cathode in which the kinetic energy of the electrons is maintained substantially within the range of the excitation energies of visible photons, and in particular the excitation energies of yellow light. Magnets are arranged to provide a magnetic field that is substantially perpendicular to the electric field between anode and cathode. The orthogonal electrical and magnetic fields along the path are provided with values that accelerate the electrons but limit the maximum kinetic energy. Low pressure gas may be provided in the tube.

Abstract: In an electron gun for use in a TWT, klystron, linear accelerator or other electron device, an electron gun header assembly and an input body assembly are coupled using a flexible bellows that allows the distance between the cathode and anode to be varied. As such, the perveance of the electron gun can be tuned, and the cathode magnetic field optimized for efficient operation. In addition, an external magnetic shield is adapted to be translated along the axial dimension of the electron gun to further optimize the cathode magnetic field and focusing characteristics to achieve improved electron gun performance.

Abstract: An electron beam source includes a base and a tip fixed to the base and extending from the base. The tip includes a core and a coating applied to the core. The core has a surface that includes a first material. The coating includes a second material which is different from the first material. The second material forms a surface of the tip, and the second coating includes more than 30% by weight of a lanthanide element.

Abstract: The present invention has an object to provide a cold cathode field-emission electron gun with low aberration, to thereby provide a high-brightness electron gun even in the case of a large current. The present invention provides a field-emission electron gun which extracts an electron beam from a cathode and converges the extracted electron beam, the field-emission electron gun including: a magnetic field lens which is provided such that the cathode is disposed inside of a magnetic field of the lens; and an extraction electrode for extracting electrons from the cathode, the extraction electrode being formed into a cylindrical shape without an aperture structure. The present invention can provide an electron gun having a function of converging an electron beam using a magnetic field, the electron gun which is capable of reducing an incidental electrostatic lens action and has small aberration and high brightness.

Abstract: A device which employs an electron beam, for performing a desired function, includes an electron gun for generating the electron beam. The electron gun includes a barrel shaped rotatable structure having a plurality of annularly disposed electron sources. A curvature of a surface portion of the rotatable structure is shaped to optimize electric field concentrations. The rotatable structure further includes end portion protrusions.

Abstract: The present invention provides a multi-beam klystron apparatus. In the above-described multi-beam klystron apparatus, the magnetic field generating element of the electron-gun-unit-side magnetic field generating unit is disposed around the electron gun unit, and a plurality of magnetic gaps are provided in the inner peripheral surface of the magnetic pole, which covers the magnetic field generating element, in the direction of travel of the electron beams. Therefore, lines of magnetic force, which are parallel to the center axis of the radio-frequency interaction unit, can be generated. Thus, even the electron beam, which is generated from the location apart from the center axis of the electron gun unit, can be guided to the radio-frequency interaction unit in the same manner as in the location at the canter axis of the electron gun unit.

Abstract: A color picture tube device has a funnel glass, a pair of horizontal deflection coils, an insulating frame, and a pair of vertical deflection coils. The pair of horizontal deflection coils are opposed to each other in a vertical direction around the outer surface of the funnel glass, and each have a window at the center. The insulating frame covers the horizontal deflection coils, resembles in shape a part of the funnel glass where the horizontal deflection coils are provided, and has openings in areas corresponding to windows of the horizontal deflection coils. The pair of vertical deflection coils are opposed to each other in a horizontal direction around the outer surface of the insulating frame, without overlapping the openings. A pair of correction coils are provided so as to be each at least partially inserted in a different one of the openings.

Abstract: A deflection unit for a cathode ray tube comprises a coil support (5). On its inner surface the coil support 5 comprises protrusions (34) having reference planes in the x-y direction. The coils provided on the inner side of the coil support have lying front flanges (8,9) which have corresponding reference surfaces (31), also extending in the x-y plane, preferably in an inner winding window (51).

Abstract: A cathode ray tube includes an electron gun directing electrons towards a faceplate having an electrode biased at screen potential. The electron beam (three beams in a color tube) is magnetically deflected to scan across the faceplate to impinge upon phosphors thereon to produce light depicting an image or information. A first pair of electromagnetic coils forward of the tube neck and deflection yoke is biased by a substantially constant current level to further deflect the electron beam. As a result, the electrons are deflected over a greater total angle than is obtained from the magnetic deflection yoke alone. A further pair of electromagnetic coils proximate the faceplate is biased by an oppositely poled substantially constant current level to direct electrons towards the faceplate, thereby to increase the landing angle of the electrons thereon.

Abstract: Apparatus for displaying video images including a vacuum envelope which includes a neck portion and a display screen and an electron gun system. The electron gun system producing at least one electron beam, which in response to a magnetic field converges the at least one electron beam onto the display screen causing video images corresponding to the at least one electron beam to be displayed thereon.

Abstract: A cathode ray tube including an electron gun including a cathode and a plurality of electrodes and for generating an electron beam, a phosphor screen and an electron beam deflection device. The cathode ray tube includes a deflection-defocusing correcting member having laminated nonmagnetic and magnetic materials disposed in a deflection magnetic field produced by the electron beam deflection device for establishing at least one non-uniform magnetic field. The magnetic materials are disposed at positions with respect to a path of the electron beam where a magnetic flux density of said deflection magnetic field is more than five per cent of a maximum magnetic flux density of the deflection magnetic field.

Abstract: A cathode ray tube includes a phosphor screen, an electron gun having a plurality of electrodes and a deflection device. Magnetic pieces attached to one of the electrodes and disposed in a magnetic deflection field generated by the deflection device are configured such that a magnetic field distribution having a region of a uniform magnetic field with an axial boundary thereof varying with a distance thereof from a tube axis is established to correct deflection defocusing.

Abstract: A color cathode ray tube includes an electron gun having a plurality of electrodes, an electron beam deflection device and a phosphor screen. A deflection defocusing correcting element is located in a deflection magnetic field produced by the deflection device to locally modify the magnetic field in a path of an electron beam and corrects the deflection defocusing of the electron beam corresponding to deflection of the electron beam. The deflection defocusing element includes the magnetic metal plate providing magnetic pole pieces and a non-magnetic metal support for holding the magnetic metal plate in place. The magnetic metal plate and the non-magnetic metal support are laminated or clad one on another, or joined edge-to-edge.

Abstract: A lamp bulb for a Christmas tree light set including two filaments connected between two lead-in wires thereof at different elevations above a mica disc.

Abstract: In a magnetic field immersion type electron gun for controlling an electron beam emitted by an electron gun (51) with the use of an electric lens (56) and a magnetic field lens formed by permanent magnets (57, 58) of a coaxial ion pump (53), the ion pump magnets are a pair of cylindrical permanent magnets (57, 58) disposed coaxially with an optical axis (52) of the electron gun (51) in such a way as to sandwich a cylindrical ion pump anode (61) of the coaxial ion pump; the two permanent magnets are magnetized in a mutually opposing direction; a hollow cylindrical yoke (60) is disposed also coaxially with the optical axis (52) in such a way as to enclose the two permanent magnets (57, 58) within a hollow portion thereof; and the yoke (60) is formed with an annular yoke gap (63) in a radially inner circumferential surface of the yoke (60) to leak out a magnetic flux flowing through the yoke toward the optical axis.

Abstract: A color display tube is described of the 3-in-line type having a display screen with a stripe-shaped phosphor pattern. The display tube has an internal magnetic shield with a scanning aperture at its gun-sided end for electron beams produced by the electron gun and scanning the display screen. This scanning aperture extends into the short side walls of the shield in a pair of diametrically extreme points at each side to form an oversized scanning aperture with two, and the aperture has a ratio from 1.5 to 1.75 standardized in accordance with the aspect ratio between the long central axis and the short central axis.

Abstract: This disclosure concerns electron guns comprising several electrodes, including a cathode. The gun has a device producing a magnetic field, adjustable if necessary, in the vicinity of the cathode. This device works together with one of the electrodes other than the cathode. It cooperates notably with the anode or the wehnelt. This device is either a solenoid or one or more permanent magnets. This device is placed either inside or outside the gun. It can be applied to high-power, "O" type electron tubes.

Abstract: A cathode ray tube, such as a blue luminescing projection television display tube including, in an evacuated envelope (1), an electron gun (5) for generating an electron beam (6) which is focused to a spot (8) on a display screen (7) by means of an electrostatic focusing lens (27, 30) and which is deflected across this display screen (7) in two mutually perpendicular directions (x, y). A structure (37) magnetized as a four-pole and consisting of a magnetic half-hard material is provided at the area of a focusing lens formed by two electrodes (27, 30) and coaxially around the gun axis (20), the axes of the four-pole being located centrally between the deflection directions. The structure (37) extends the spot in the vertical direction so that phosphor saturation, particularly in blue projection tubes is reduced.

Abstract: A charged particle beam generating apparatus of multi-stage acceleration type includes a charged particle beam source and a multi-stage acceleration tube having a plurality of acceleration electrodes arranged in cascade over a plurality of stages within the tube. A plurality of outer shield electrodes are disposed in concentrical relation on the radially outer side of the multi-stage acceleration tube over the plural stages to be applied with the same potentials as those of the associated acceleration electrodes respectively. Finally, a plurality of dividing resistors are disposed outside of the multi-stage acceleration tube or between the outer shield electrodes and the multi-stage acceleration tube so as to apply predetermined potentials to the acceleration electrodes, respectively.

Abstract: In a field emission electron gun system with a multi-stage acceleration tube comprising a field emission electron source, a field emission electrode for extracting the electrons, a magnetic lens having a magnetic gap between the field emission electron source and the field emission electrode or a magnetic lens having a magnetic pole which also serves as the field emission electrode, and at least two-stages of acceleration electrodes for accelerating the electrons, a magnetization current I for the magnetic lens is changed interlocking with a field emission voltage V.sub.1 applied between the field emission electron source and the field emission electrode so that IN/.sqroot.V.sub.1 (N: the number of windings of the magnetic lens) takes a predetermined value and a first acceleration voltage V.sub.2 applied between the field emission electron source and the first-stage acceleration electrode is changed interlocking with the field emission voltage V.sub.1 so that V.sub.2 /V.sub.1 takes a predetermined value.

Abstract: A magnetic focusing type cathode ray tube comprising a magnetic focusing device positioned in front of a three beam in-line type cathode for focusing the electron beam emitted from the cathode. The magnetic focusing device is constructed of a magnetic yoke assembly having a pair of magnetic yoke members. Each magnetic yoke member has three cylindrical magnetic yoke portions through which an electron beam can pass, and one common cylindrical magnetic yoke portion having a larger diameter which completely surrounds the three electron beam passages. The cylindrical magnetic yoke portions of the yoke members are spaced equidistantly, facing each other in the electron beam passages.

Abstract: An electromagnetic focusing cathode-ray tube in which plural pairs of magnetic material members are arranged within the tube along the tube axis, the magnetic material members in each pair are disposed to oppose each other in the direction of the tube axis with a gap defined therebetween, and the plural magnetic material member pairs and one or more permanent magnet disposed internally or externally of the tube are combined such that magnetic focusing fields having their senses or directions opposite to each other in the direction of the tube axis are formed at the respective gaps associated with the adjacent magnetic material pairs.

Abstract: An enhancer for enhancing the horizontal deflection of an electron beam in a kinescope includes a quadrupole deflector. The quadrupole deflector is orientated so that the convergent action occurs in the same plane as the horizontal deflection. The divergent action is substantially decreased by utilizing additional members to shunt out the magnetic field which causes the divergent action.

Abstract: An astigmatic cross-over of the electron beam produced by an electron gun in a cathode ray tube is effected by a non-circular symmetrical magnetic field produced by a permanent magnet arrangement provided in the vicinity of the grid of the gun. The spot produced by the beam on the display screen of the tube has a minimum of haze surrounding it and has dimensions which do not vary substantially with potential variations at the grid.

Abstract: A multiple electron lens having two axially spaced polepieces defining a space therebetween. The polepieces each have a plurality of axial through openings aligned coaxially defining electron beam paths. A sole anode plate is disposed axially spaced from the polepieces and has openings aligned with the openings defining the beam paths and equal in number thereto. Each beam path has an auxiliary exciting coil and a corresponding stigmator coaxially arranged with the related beam path within the space defined between the polepieces.

Abstract: An improved magnetic lens having a long focal length for the optical imaging of a specimen having a large surface area by means of a charged-particle beam. The lens includes a cylindrical coil including at least one winding which is surrounded by a field-carrying metallic shell member fabricated of magnetic material disposed at the radially outer surface of winding.

Abstract: An improved matrix lens for use in an electron beam optical system of the type having first means for forming a narrow beam of electrons, coarse deflection means associated with the first means for scanning the electron beam to each lenslet of a matrix array of individual lenslets each focussing the beam upon a predetermined portion of a target surface, and fine deflection means cooperating with the matrix lenslet array for scanning the electron beam to each of a plurality of locations in a two dimensional array defined upon the target surface, the improvement herein utilizing a single plate having multiple apertures for forming the matrix lens means and accelerator means utilized with all of the apertures of the lens means for uniform acceleration of the electron beam. An improved fine deflection means utilizes a magnetic deflector positioned adjacent to the under surface of the target and remote from the matrix lens.