Abstract: A magnetic focusing type cathode ray tube includes a magnetic yoke assembly, for magnetically focusing and converging three in-line electron beams, having a pair of magnetic yokes opposing each other with a predetermined gap therebetween. The magnetic cylinders on the cathode side are so formed as to have a strong magnetic shield effect while the magnetic cylinders on the screen side are weak in magnetic shield effect. The radial components in the magnetic field produced in the magnetic gap, which act on the side beams in a direction perpendicular to an in-line direction, are reverse in polarity on the cathode side and screen side so that radial components emerge so as to converge the beams in a tube axis direction.

Abstract: A pyroelectric target made of a pyroelectric material which is anisotropic dielectrically. Electrodes are provided on two plane parallel faces. To raise the pyroelectric figure of merit, the angle between the pyroelectric axis and the normal to the planar faces is greater than substantially 0.degree. but less than 90.degree.. A method of manufacturing such a target includes the step of selecting such an angle and cutting the faces into the material at the selected angle. A pyroelectric vidicon tube incorporating such a pyroelectric target has improved performance. Preferably, the projection of the normal to the planar faces onto a plane perpendicular to the pyroelectric axis is parallel to the axis along which the dielectric constant is lowest.

Abstract: A grid apparatus for use with a color cathode ray tube is described, having a pair of opposing frame members, and a pair of arm portions respectively welded at free ends thereof to the pair of opposing frame members for mechanically connecting the pair of opposing frame members, and for stretching the grid elements with a predetermined tension in cooperation with the pair of opposing frame members, in which each of the pair of arm portions is curved generally as a U-shape in substantially one plane. Both ends of the arm portions are respectively connected to the pair of opposing frame members at positions outside from their Bessel points, and the plane in which each of the pair of arm portions is arranged to respectively widened rearward with an angle from 45.degree. to 65.degree. with respect to a surface perpendicular to an axis of the grid apparatus.

Abstract: An arc-extinguishing ampul and a low-pressure arc discharge lamp, such as a fluorescent lamp, having such ampul on each electrode structure, the ampul comprising a thin-walled glass body enclosing an arc-extinguishing gas, at least one electrically conductive support wire, and a heat-conductive coating covering the outer surface of the ampul and portions of the support wire. Upon depletion of the electron-emissive coating on one electrode filament at the end of the useful life of the lamp, the arc discharge is attracted to the ampul by the support wire. The heat of the arc softens and melts the ampul to the point where the arc-extinguishing gas within the ampul escapes and renders the lamp inoperable without loss of the lamp's hermetic seal.

Abstract: An improved gas discharge display device is provided having an envelope of at least one glass plate with an electrode pattern thereon. The electrode pattern is formed into small surface elements constituting cathode areas, and is provided in facing relationship to another electrode pattern constituting anodes.

Abstract: A gas discharge device containing at least two electrodes is shown, at least one thereof being insulated from the gas by a dielectric member containing a predetermined beneficial amount of a source of at least one Lanthanide Series rare earth including CeO.sub.2 or La.sub.2 O.sub.3. In one embodiment, a multiple gaseous discharge display/memory panel has an electrical memory and is capable of producing a visual display, the panel having an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric charge storage members, each of which is backed by an array of electrodes that are oriented with respect to the array behind the opposing member to define a plurality of discrete discharge volumes constituting a discharge unit.

Abstract: A method of making an electron permeable window is provided which entails depositing a thin film of an inert, high strength material or compound having a low atomic number onto a substrate by chemical vapor deposition (CVD). Following that deposition, a window pattern and window support perimeter are photolithographically defined and the substrate is etched to leave the desired window structure. For a particular class of materials including SiC, BN, B.sub.4 C, Si.sub.3 N.sub.4, and Al.sub.4 C.sub.3, films are provided which are exceedingly tough and pinhole free, and which exhibit nearly zero internal stress. Furthermore, due to their extreme strength, these materials allow fabrication of extremely thin windows. In addition, because of their low atomic number and density, they have excellent electron penetration characteristics at low beam voltages (15 to 30kV), so that most conventional CRT deflection schemes can be used to direct the beam.

Abstract: The electrodes of an electron-gun system of a color-picture tube are heated less as their distance from the cathode of the system increases. The electrode materials are so chosen with respect to their coefficients of expansion that no mechanical stresses are caused in the system structure despite the different temperatures.

Abstract: An electron gun having at least one arc-suppression resistor located in a zero electric field gradient area of the electron gun is described. In the electron gun, at least one cathode is provided for generating an electron beam. A plurality of electrodes are also provided for directing the beam along the beam path. The electrodes include at least one accelerating and focusing electrode which is a split member having two spaced apart sections. The electron gun also includes at least one arc-suppression resistor which interconnects the spaced apart sections of the split electrode and is located in a zero electric field gradient area of the split member.

Abstract: A color cathode picture tube including an envelope having a fluorescent screen therein, a shadow mask assembly having a shadow mask and a mask frame for holding the shadow mask at its peripheral edge, and a shadow mask supporting member for supporting the shadow mask assembly inside the envelope. The shadow mask supporting member comprises a first metal strip having a thermal expansion coefficient substantially equal to that of the mask frame, a second metal strip joined to the first metal strip at one side thereof so that their respective faces may form a continuous face, this second strip having a thermal expansion coefficient higher than that of the first strip, and a third metal strip joined to the first metal strip at the other side thereof so that their respective faces may form a continuous face, the third strip having a thermal expansion coefficient lower than that of the first metal strip.

Abstract: A color television display tube having attached to the cone surface abutments in the form of studs or wedges against which the system of deflection coils is placed. The abutments consist of a glass-ceramic material which enables them to be manufactured in a simple manner and allows attachment by means of a rigid lasting glued joint between the abutments and the cone.

Abstract: To prevent the occurrence of brittle weld junctions upon joining thin intal lead-in wires (3a, 3a') to thicker connecting pin wires (3b, 3b'), an intermediate element of nickel (4) is positioned between the thinner and thicker wire parts, the nickel joining easily with the two parts of the molybdenum wires. The junction molybdenum-nickel-molybdenum, or tungsten-nickel-tungsten in case tungsten wires are used, is preferably located within the region of the press (5) of the lamp (1). In contrast to direct welding of molybdenum to molybdenum, or tungsten to tungsten, the weld does not decay.

Abstract: An ignition plug of extended durability which reduces crack formation in noble metal layer on the center electrode and the ground electrode by joining a noblemental layer consisting of 85 to 70% by weight of Pt and 15 to 30% by weight of Ir to the spark discharge portion of the center electrode and also another noble metal layer consisting of 90 to 70% by weight of Pt and 10 to 30% by weight of Ni to the spark discharge portion of the ground electrode.

Abstract: A getter assembly is provided with a tab and a support means adapted for contacting the wall of an electron tube, preferably a television picture tube, the support means is in the form of a metal strip, integral with the getter assembly, bent into a U-shape and terminating at each end with a rounded support foot.

Abstract: The present invention is an improvement in an electron gun assembly. Such a gun assembly includes a plurality of indirectly heated cathode assemblies and at least two spaced successive electrodes having aligned apertures therein for passage of a plurality of electron beams. The cathode assemblies include a plurality of cathode heaters which are attached to at least two electrically insulating support rods by a plurality of heater bead straps. Each of the heater bead straps includes a main body portion having a distal end and a proximal end. The proximal end has a bifurcated portion comprising a pair of closely spaced apart grasping members for embedment into one of the insulating support rods. At least one member of the pair of grasping members is angulated with respect to the main body portion to increase the retention of the heater bead straps to the insulating support rods.

Abstract: A cathode ray tube has discrete x-ray absorbing means integrally associated with the face region thereof to beneficially attenuate the x-radiation emanating peripherally and forwardly therefrom. Attached to the tube face is a closed frame-like resilient gasket impregnated with x-ray absorbing material. Superposed thereon is a cover plate of x-ray absorbing glass. This is adhered to the tube face by a layer of substantially transparent adhesive confined within the gasket.

Abstract: A cathode-ray tube for a projector, wherein a mesh-like or striped heat conduction member is disposed on an outer surface of a faceplate corresponding to an effective area of a phosphor screen, and the heat conduction member is conductively in contact with a heat radiator which is secured on the outer side of the faceplate.

Abstract: An electron gun assembly includes a plurality of cathode assemblies and a plurality of spaced successive electrodes mounted on at least two electrically-insulating support rods. At least one of the electrodes comprises a deep-drawn substantially rectangular cup-shaped member having a base portion, a supporting flange portion, including a plurality of attachment tabs, and a sidewall extending between said base portion and said supporting flange. The sidewall includes a substantially wedge-shaped shoulder on each of the opposed side thereof that projects outwardly at an acute angle of about 45 degrees from the sidewall. The shoulders extend into the supporting flange adjacent to the attachment tabs. The shoulders form a gusset on each of the opposed sides of the cup-shaped member thereby increasing the structural rigidity of the member.

Abstract: An improved spark plug is provided wherein a part of a ground electrode facing an exposed end part of a central electrode is angled to the vertical and horizontal planes of the spark plug so as to deflect the movement of a flame front into a swirling movement.

Abstract: An electron beam guide assembly for a flat panel display device includes an acceleration electrode having two portions separated by a longitudinal slit. The display device also includes electrodes on support walls which divide the device into channels. By properly voltage biasing the acceleration electrode portions and the support wall electrodes, an electron beam is simultaneously directed to a particular color producing material and transversely scanned across the channels. A color display, therefore, can be produced using one electron beam per channel.