Abstract: 1. A photoconductive target for a pickup tube comprising a layer of porous lead telluride on a transparent conductive layer, said porous lead telluride having a resistivity of approximately 10.sup.-11 ohm cm when maintained at a temperature substantially equal to liquid nitrogen temperature.

Abstract: Photocathode having a transparent conductive undercoating to provide a radial voltage distribution across the cathode surface. The conductive undercoating is in the form of radially spaced rings made of chromium deposited on a glass substrate. Over the substrate and the conducting undercoating is provided a resistive layer comprising chromium having a thickness of about 50 Angstroms. Over the resistive chromium layer is deposited a photoemissive layer of antimony, potassium, sodium and cesium. The radially spaced conductive rings are connected to sources of different voltage to produce a desired voltage distribution across the resistive chromium layer.

Abstract: The method comprises the steps of providing a camera tube having an evacuated envelope, a photoconductive layer primarily of lead monoxide, an activated getter and an unactivated getter within the envelope. After a period of operation or storage the tube exhibits a deterioration in spectral photosensitivity of the layer. The characteristic ratio of blue light photosensitivity is measured and when the ratio is less than about 80% the unactivated getter is activated to regenerate the tube.

Abstract: A substrate, such as a ceramic body, carries a layer of glaze consisting essentially of (a) an inorganic oxide glass matrix that is essentially free from ions which migrate in a high-electric field, (b) about 1 .times. 10.sup.19 to 50 .times. 10.sup.19 antimony cations distributed in each cubic centimeter of the glass matrix, and (c) about 4 to 30 weight percent with respect to the weight of said glaze of discrete tin-oxide particles in the antimony-containing glass matrix. The method comprises dissolving antimony, as a compound thereof, in a glass, mixing together particles of said glass and tin-oxide particles, coating the mixture on a substrate, heating the coated substrate to melt the glass particles while retaining tin oxide in discrete particulate form, and then solidifying the molten coating.

Abstract: Method comprises (a) applying to a supporting surface a coating comprised of a photosensitizable water-soluble polymer, a soluble dichromate photosensitizer for the polymer, a soluble vanadate, and particles of the pattern material; (b) exposing the coating to a pattern of actinic radiation until exposed portions of the coating are rendered insoluble; (c) and flushing the exposed coating with an aqueous solvent to remove soluble portions of the coating, while retaining the insoluble portions of the coating in place.

Abstract: An evacuated envelope includes front and back walls and a plurality of spaced, parallel supports between, and perpendicular thereto which form a plurality of parallel channels. A gun structure at one end of the channels directs one or more electron beams along each of the channels. In each of the channels is at least one beam guide which confines the electrons of the beam but permits selective deflection of the electron beam out of the guide toward a phosphor screen on the inner surface of the front wall. The beam guide includes electrodes on the inner surface of the back wall and either a single grid plate or a pair of spaced, parallel grid plates spaced from and parallel to the back wall. The beam guide also includes means for laterally confining the electrons of the beam which may include spaced parallel wires between the back wall and the grid plates and extending along the channel or a special configuration of the electrodes on the back wall.

Abstract: A nickel oxide surface layer of a nickel mesh supporting structure is coated with a layer of chromium. The nickel oxide layer has a thickness of between about 500 to 750A. The layer chromium is at least about 100A thick. The chromium coated nickel oxide-nickel mesh is particularly suitable for use in vidicon tubes.

Abstract: A phototube includes a cup-shaped apertured electrode interposed between a substantially flat cathode and an electron collection electrode. Anapertured electrode is coaxially secured within the recess of the cup-shaped electrode in parallel spaced-apart facing relation to the cathode.

Abstract: Method comprises heating the viewing window of a cathode-ray tube to temperatures above 35.degree. C, dispensing from a storage container onto a surface of said window a quantity of slurry comprised of particulate material mixed with a liquid vehicle, the quantity of slurry being in excess of that required to coat said surface, spreading the quantity of slurry over the surface whereby the slurry is heated by the window, collecting the excess slurry from the surface and returning it to the storage container, and removing the heat transferred to the excess slurry from the window.

Abstract: The base comprises a tubular housing adapted to fit over the exhaust tubulation of an electron tube stem, and a wafer flange extending outwardly from the open end thereof. The flange is apertured to receive an array of conductors of the stem. A recess is provided in the wafer flange facing the stem and a passageway communicating therewith is provided through the base separate from the housing cavity for the purpose of injecting a dielectric material into the recess around some of the stem conductors. The passageway may, e.g., be through the flange or in the housing wall.A shoulder is provided on the recessed face of the wafer flange to provide relief for random protuberances on the periphery of the stem to permit non-tilted mounting of the base on the stem.

Abstract: In inspecting a cathode-ray-tube window having a light-scattering inner surface, a pattern, which approximates the structure of the video images to be viewed through the window, is placed close to or against the inner surface. The pattern is observed through the window, and those local regions where the pattern appears to be distorted are identified.

Abstract: A cermet film includes metal particles in an insulator with the metal particles having an average diameter of from about 30A to about 120A. The cermet film has a high resistivity, and low temperature coefficient of resistivity, and is stable under electric fields of up to 10.sup.5 volts/cm. The cermet film can be formed by co-sputtering the metal and the insulator onto a substrate. The sputtered cermet film is then annealed in a reducing atmosphere whereby its resistivity is increased without a corresponding change in its temperature coefficient of resistivity.

Abstract: An in-line electron gun assembly for a color television picture tube has a center cathode disposed between two outer cathodes. The cathodes are substantially coplanar and each is supported at a predetermined distance from a control grid by a separate cathode support structure. Each cathode support structure includes a cathode eyelet. The center cathode eyelet is formed of a material having a smaller coefficient of thermal expansion than that of the two outer cathode eyelets so that the variations in carthode-to-grid spacing due to temperature changes during warm-up are kept substantially equal from cathode to cathode.

Abstract: The method comprises applying to a surface to be etched a coating of a liquid composition comprising an acid-precipitated casein, alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.

Abstract: An electron discharge tube comprises a photocathode, a dynode, a mesh having openings of non-uniform sizes on the dynode, and an anode, all in an evacuated tube. The mesh comprises a plurality of spaced first elongated elements of electrically conducting material and a plurality of spaced second elongated elements of electrically conducting material, intersecting to form openings of non-uniform sizes.

Abstract: Prior to mounting the mask in its prescribed position spaced from the inner surface of the panel, the panel surface is coated with a film of an organic material to improve the resistance of that surface to abrasion and bruising. The film is volatilizable when heated in air at temperatures up to about 400.degree. C so that it is easily removable by baking.

Abstract: A thin coating of carbon is used as a mask to define regions of a crystalline material of the group III-V compounds. A carbon mask is coated on portions of a surface of a substrate and the masked substrate contacted with the group III-V material to deposit the crystalline material only on the portions of the surface of the substrate not covered with the masking coating. The group III-V material will not be deposited on the carbon coating, since it is incapable of nucleating the growth of the crystalline material. Accordingly, a defined region of the crystalline material is formed. The carbon masking coating can also be used as a mask for etching cavities or recesses in a substrate of the group III-V material.

Abstract: Method comprises adsorbing colloidal particles of a latex onto phosphor particles, providing filter particles in a liquid medium, optionally adsorbing colloidal particles of a latex onto the filter particles and combining the phosphor particles and filter particles into a single mixture. The foregoing steps, which are conducted in aqueous media, may be carried out in any order. Thereafter, the combined mixture of phosphor particles with adsorbed colloidal particles thereon and filter particles is coagulated while in an aqueous medium.

Abstract: In the method disclosed, a supporting surface, such as the inner surface of the faceplate of the tube, is coated with a photosensitive polymeric film containing about 5 to 80 weight percent of at least one member of the group consisting of certain diol ethers and diol alkanes. Then the film is exposed to a light image to produce regions of greater solubility and regions of lesser solubility. The film regions of greater solubility are removed, and then the entire faceplate with its regions of less solubility is overcoated with a layer containing particles of screen structure material. The retained film regions and the overcoating thereon are removed leaving the screen structure adherent in the areas of greater solubility. By including a diol ether or diol alkane in the film, the exposure time may be shortened significantly without substantial loss of adherence.

Abstract: A family of cathodoluminescent phosphors which consist essentially of oxy-chalcogenides of lanthanum and/or lutetium containing, for each mol of phosphor, between 0.0002 and 0.2 mol of dysprosium, erbium, europium, holmium, neodymium, praseodymium, samarium, terbium, or thulium. Up to 15 mol percent of the lanthanum and lutetium may be replaced with yttrium or gadolinium. The phosphors may be prepared by reacting the constituent elements as compounds thereof at temperatures between 900 and 1300.degree. C. for 0.2 to 5.0 hours and then cooling the reaction product.