Abstract: A projection cathode ray tube has an interference filter which is disposed at a boundary between a face plate and fluorescent layers. The interference filter is designed to be thinnest at the central area of the CRT and to become gradually thicker toward the peripheral area of the CRT, so that the CRT can produce a uniformly bright image over the central and peripheral areas. The fluorescent layers include a first layer composed of small fluorescent particles and a second layer composed of large fluorescent particles. With this first fluorescent layer, light beams emitted by the second fluorescent layer can be prevented from being reflected in multiple directions, thereby minimizing halo due to such multi-direction reflection of the light beams.

Abstract: A method of preparing a pigment-coated phosphor is provided which comprises the steps of:(a) preparing a pigment dispersion by adding pigment particles in an amount of 0.05 to 10% by weight, based on the amount of phosphor, to one of (i) a solution comprising adipic acid in the range of 0.05 to 2% by weight, based on the amount f phosphor, or (ii) a solution comprising 1,6-hexanediamine in the range of 0.05 to 2%, based on the amount of phosphor, and(b) mixing the pigment dispersion with the other of the solutions not used to form the pigment dispersion and with a phosphor dispersion comprising a phosphor dispersed in distilled water to form a pigment-coated phosphor. A pigment coated phosphor prepared according to this method is also provided.

Abstract: To reduce reflection at a surface of a cathode ray tube display window, the surface is provided with a pattern of irregularities formed by ultraviolet laser radiation. Preferably the inside surface of the display window of the cathode ray tube is treated with the pattern of irregularities followed by a phosphor pattern over the treated surface. In one embodiment, a transmission grating is used to pass ultraviolet radiation to form the irregularities.

Abstract: A luminescent screen assembly for a CRT is made by first coating the interior surface of a faceplate panel with a photoconductive layer which overlies a conductive layer. A multiplicity of red-, green- and blue-emitting phosphor screen elements are then deposited in color groups, in a cyclic order, onto the interior surface of the panel. A substantially uniform charge is established on the photoconductive layer. The charge is weakened in the areas where the photoconductive layer underlies the phosphor screen elements, but unaffected in the open areas separating the phosphor screen elements. The charged open areas of the photoconductive layer are directly developed by depositing thereon particles of light-absorptive matrix material having a triboelectric charge opposite in polarity to the charge established on the photoconductive layer.

Abstract: An apparatus for fusing a polymer powder deposited on a surface of a faceplate panel of a cathode-ray tube comprises a housing having a faceplate support surface and enclosing a chamber. A shutter adjacent to the panel support surface separates the faceplate panel from the chamber. A reservoir for holding a solvent is within the chamber and at least one piezoelectric transducer communicates with the reservoir for atomizing the solvent to create a fog. A fan within the chamber distributes the fog onto the polymer powder. A method for fusing the polymer powder onto the faceplate panel also is described.

Abstract: The covering (13) of a printing roller (10) for transferring hot glue printing material from a printing block to the front panel of a display consists of cast silicone rubber without any silicone fluid. The use of silicone-fluid-free silicone rubber ensures that the printing materials will adhere well to the panel even in a sequence of printings, because the adhesion properties of the panel will not have been reduced by silicone fluid that would otherwise have been transferred from the roller to the panel. Although the roller covering is devoid of silicone fluid as stripping agent, the printing material nevertheless separates readily from the covering, because the latter is cast and therefore has a very smooth surface.

Abstract: A method of producing a fluorescent screen of a cathode-ray tube inclusive of a process to form carbon stripes by coating an inner surface of a panel with a carbon film and then drying, exposing and developing such a carbon film. The method comprises the steps of perceiving the carbon stripes on the inner surface of the panel as video information by optical means, then inputting the video information to an image processor to calculate the line widths of the carbon stripes, and controlling the exposure during the carbon stripe exposure process on the basis of the line widths thus calculated. According to this method, the line widths of the carbon stripes can be maintained constant to enhance the quality stability, and the measuring operation is remarkably simplified by a completely automated mechanical system.

Abstract: A red pigment coated phosphor comprises a phosphor for color cathode ray tube and red pigment attached to said phosphor by an organic binder, wherein said organic binder is gellatin and casein. A process for preparation of a red pigment coated phosphor comprises the steps of: preparing three dispersions of red phosphor particles, red pigment particles and organic binder, respectively; uniformly mixing said three dispersions and agitating them sufficiently; adjusting pH of the mixture obtained; and adding a curing agent thereto, washing said mixture and then drying it. The red pigment coated phosphor of the present invention has a good dispersion and a good affinity for phosphor slurry.

Abstract: A process is described for the formation of an undercoat which is in turn useful in forming a CRT metal back layer. According to the process, a pretreatment composition is coated on a glass panel having a fluorescent layer overlaid thereon, so that a water film is formed. The pretreatment composition is composed of 2-20 wt. % of an alkyl monoalcohol having a C.sub.1-3 alkyl group, 0.05-1 wt. % of a water-soluble, high molecular compound and 79-97.95 wt. % of water. An undercoating composition is then coated on the water film by a wet-on-wet coating method, whereby a coating layer is formed. The undercoating composition is composed of 1-7 parts by weight of an acrylic resin, which has been obtained by polymerizing 90-100 wt. % of an alkyl methacrylate having a C.sub.1-4 alkyl group other than tertbutyl methacrylate and 0-10 wt. % of an ethylenically unsaturated monomer copolymerizable therewith, and 99-93 parts by weight of a solvent containing at least 80 wt. % of toluene.

Abstract: The invention is method of forming a multi-color luminescent display including the steps of depositing on an insulator substrate a smooth single layer of host material which itself may be a phosphor with the properties to host varying quantities of different impurities and introducing one or more of said different impurities into selected areas of the single layer of host material via an appropriately positioned mask as by thermal diffusion or ion-implantation to form a pattern of phosphors of different colors in the single layer of host material such that the top surface of the host layer remains smooth. Red phosphors are formed by adding impurities selected from the group consisting of Sm, SmF.sub.3, Eu, EuF.sub.3, and ZnS:MnTbF.sub.3 to a ZnS host; green phosphors by adding impurities selected from the group consisting of Tb and TbF.sub.3 to a ZnS host; and blue phosphors by adding impurities selected from the group consisting of Tm, Al, Ag and Mg to a ZnS host.

Abstract: The invention relates to a method for manufacturing a phosphor screen on an inner surface of a CRT panel, having a faceplate, a blend radius, and a sidewall. The method includes the steps of depositing at least one phosphor layer (R, G, B), containing a binder, on the inner surface of the faceplate, and then coating the phosphor layer, the blend radius, and at least a portion of the sidewall with a filming material. The coating of the filming material is dried to form a film. The film, or at least that portion thereof overlying the blend radius and the side wall, is contacted with an adhesion-promoting, blister-reducing solution which contains operable quantities of silica particles, a low vapor pressure alcohol and deionized water. A metal layer is deposited on the film, and the film and the binder contained in the phosphor layer are volatilized.

Abstract: A an europium doped yttrium oxide red phosphor in a water base phosphor coating suspension is checked for degraded phosphor by (a) centrifuging the suspension, (b) separating an aqueous portion from a solids portion, (c) exposing a surface portion of said solids to UV radiation at 254 nm or 365 nm, (d) observing the presence or absence of fluorescence from said top layer of solids wherein the absence of fluorescence is indicative of a degraded phosphor.

Abstract: A phosphor comprising a phosphor and zinc oxide formed in a suspension of the phosphor and attached to the surface of the phosphor.

Abstract: A cathode ray tube (CRT) having a surface with reduced gloss and reflectivity and a method for providing such reduced gloss and reflectivity. In the method of the invention, a solution of a silane and a saturated hydrocarbon in a solvent system of an alcohol and water is provided. The solution is applied to the surface of a cathode ray tube to impart antiglare properties to the surface. Thereafter, the CRT with the silane applied is cured at an elevated temperature for a period of time sufficient to cause the silane to react and be converted to siloxane.

Abstract: A method for manufacturing a metallic, luminescent screen for a CRT includes the steps of: depositing at least one phosphor layer on an inner surface of a faceplate of a panel, to form the luminescent screen; preheating the panel containing the screen to a temperature in excess of a minimum film-forming temperature; and depositing an aqueous emulsion of at least one acrylic film-forming resin onto a screen and drying said emulsion to form the film. Then, a metallic coating is deposited onto the film and the panel bearing the metallized screen is sealed to a funnel by heating the panel and funnel through a sealing cycle. The sealing cycle has predetermined rates of temperature increase and includes a temperature range within which the film is volatilized. The rate of temperature increase within the volatilization range is less than the rate of temperature increase in other portions of the sealing cycle.

Abstract: This invention proposes methods of effectively forming a metal-backed layer and an anode using a metal film transferring sheet in which micro-holes are formed. that is, the metal film transferring sheet is structured by forming a metal film on a mold-releasable, highly characteristic sheet. Then, the metal film having micro-holes of the metal film transferring sheet is transferred onto a phosphor screen. Or, on the metal film of the above-mentioned metal film transferring sheet, is formed a phosphor screen and the metal film, the phosphor screen, etc. are all transferred onto a face plate form an anode of a cathode-ray tube. Then the methods proposed by this invention are applied for making phosphor products of, for example, a cathode-ray tube or a plasma display. According to these methods, there is no need to use a large-scaled manufacturing facility and high quality, low cost products can be obtainable.

Abstract: The method of electrophotographically manufacturing a luminescent screen assembly on a substrate for use within a CRT, according to the present invention, includes the steps of: forming a conductive layer on the substrate; overcoating the conductive layer with a photoconductive solution comprising an organic polymeric material, a suitable photoconductive dye, a plasticizer and a solvent to form a photoconductive layer; and, then, establishing an electrostatic charge on the photoconductive layer. Selected areas of the photoconductive layer are exposed to visible light to affect the charge thereon, and the photoconductive layer is developed with charged screen structure material. The improved method utilizes a dialkyl phthalate plasticizer which is selected from the group consisting of dibutylphthalate (DBP), dioctylphthalate (DOP), and diundecylphthalate (DUP).

Abstract: A phosphor paste composition is disclosed, which uses as an organic binder an acrylic polymer obtained by copolymerizing an alkyl methacrylate as a principal component with a specific amount of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates. Also disclosed is a phosphor paste composition making use of a phosphor having a volume average particle size in a range of 1-7 .mu.m, with particles having a particle size of 1-9 .mu.m accounting for at least 60 wt. %. These phosphor paste compositions have excellent firing characteristics and provide phosphor coatings excellent in both light-emitting characteristics and resolution.

Abstract: There is provided a process for treating the surface of a fluorescent material comprising the steps of adding a suitable amount of water glass (K.sub.2 O.SiO.sub.2) to a dispersion of a fluorescent material, the mixture of the dispersion and water glass being stirred, adding silica particulates to the mixture, and finally adding a suitable amount of metal salt to the mixture containing the silica particulates, whereby the silica particulates adhere to the surface of the fluorescent material.

Abstract: A phosphor comprising a phosphor and zinc oxide formed in a suspension of the phosphor and attached to the surface of the phosphor.

Abstract: A color reference CRT of the type employing a screen of a pattern of individual phosphor elements of different color components, is produced by adjusting the screen weights of the different color components to achieve the desired reference color when the screen is scanned by an electron beam of predetermined beam current and anode potential.

Abstract: Apparatus for applying a conductive coating of DAG material to the inner surface of a cathode ray tube (CRT) funnel includes a stationary DAG spray gun and a movable DAG rotating slinger. The CRT funnel is rotated to allow the stationary spray gun to deposit a first DAG coating on an intermediate flared portion of the inner surface of the funnel, including the location of its anode button. The DAG slinger, which includes a rotating disc for radially discharging the DAG, is then displaced through the neck portion of the CRT funnel toward the open, enlarged end of the funnel to deposit a second DAG coating which overlaps the first DAG coating. The apparatus includes a variable DAG flow control arrangement for depositing a DAG coating of uniform thickness over the inner surface of the CRT funnel, as well as a DAG cleaning and recovery arrangement for preventing DAG not deposited on the CRT funnel from escaping to the environment and for recovering this DAG for re-use.

Abstract: The invention is a multi-color luminescent display 10 comprising an insulator substrate 11 and a single layer of host material 13 which may be a phosphor deposited thereon that hosts one or more different impurities 14, therein forming a pattern of selected and distinctly colored phosphors such as blue, green and red phosphors in the single layer of host material 13. Transparent electrical conductor means 12 may be provided for subjecting selected portions of the pattern of colored phosphors to an electric field thereby forming a multi-color, single layer electroluminescent display.

Abstract: A thin film phosphor screen structure includes a light-transmitting substrate layer, a phosphor layer on the substrate layer formed with a plurality of parabolic-shaped cells containing phosphor material, and a reflective layer coated over the parabolic phosphor cells for reflecting light generated in the cells for transmission externally through the substrate layer. The parabolic cells are configured corresponding to the desired resolution of the display and to critical angle of diffraction for the phosphor/substrate interface. An anti-reflection coating may be applied at the phosphor/substrate interface. The phosphor layer may have a graded dopant structure or an impressed electric field for causing generated electrons to migrate toward the focal plane of the parabolic phosphor cells.

Abstract: A method for making a dark, adherent coating on exposed metal surfaces of a color-selection electrode assembly of a CRT includes the steps of applying a first solution of aqueous phosphoric acid to the metal surfaces of the assembly; contacting the metal surfaces with a second solution of selenium dioxide and methanol; rinsing the assembly; and then, applying a sealing solution to the surfaces of the assembly.

Abstract: A process for preparation of pigment coated phosphor comprises: preparing a phosphor solution by mixing an acryl emulsion and phosphor particles; preparing a pigment solution by mixing polyvinyl alcohol and pigment particles; mixing the two solutions; adding an acid solution to adjust the mixture to a pH of 3 to 7; and adding oxalic acid as a curing agent, thereby attaching the pigment particles to the phosphor particles.

Abstract: A method of manufacturing a phosphor screen for a cathode ray tube comprises the step of forming a suspension of a phosphor material and a resin particle having an average particle size of 0.5 to 20 micrometers in an aqueous solution containing a photosensitive resin, a dispersing agent and a binder; coating an inner surface of a cathode ray tube with the suspension to form a phosphor screen; then forming an intermediate layer on the phosphor screen; then forming a metal back layer on the intermediate film; and finally baking the whole product so that the brightness of the phosphor screen of the cathode ray tube can be increased.

Abstract: The bulls-eye effect produced by projection television cathode ray display tubes with convexly curved faceplates and multi-layer interference filters is compensated by increasing the optical absorption of one of the filter layers having a decreasing center-to-edge thickness gradient. Since the layer is thicker in the center, more attenuation of the light output occurs there than at the edges of the display window, resulting in improved luminance uniformity of the display.

Abstract: A device for the internal graphitization of the surface of the neck in the cone of cathode ray tubes.A device of this type comprises a frame bearing two arms, such as, capable of rotating around an axis, such as, each bearing a collar, for example, each adapted to a given type of cone. This collar has two functions: that of providing for centering along an axis (xx) of the neck of the cone and that of defining a reference line (L.sub.r).With these arms there cooperate, firstly, a supporting table on which the cone is laid and centered in a horizontal plane and, secondly, a graphitization system such that the brush in its top position reaches a determine upper limit (Lg) and, finally, a combination of means providing for the upward translational motion of the supporting table and of the graphitization system, the regulated descent of the latter, the supporting table remaining still during this stage of descent of the brush.

Abstract: A method of forming a film of metal fluoride in which there is combined a metallo-organic compound solvent solution and an organic fluoride to form a casting liquid. The casting liquid is then coated by a method such as dip coating or spin coating to form a coating on a substrate. The coated substrate is then heated to decompose the metallo-organic compound and organic fluoride resulting in recovery of a metal fluoride coated substrate. The metal fluorides formed may be fluorides of lithium, sodium, potassium, magnesium, calcium, strontium, or barium, lanthanum, yttrium, or the oxifluoride of europium, erbium and other rare earths.

Abstract: The method of making a bi-layer coating on phosphor particles is disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.

Abstract: Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of an aluminum oxide coating on individual particles of a phosphor powder while the particles are suspended in a fluidized bed. The particles in the fluidized bed are exposed to vaporized coating precursor material, preferably aluminum isopropoxide at a temperature above 300.degree. C. The bed is kept at as nearly an isothermal condition as possible. Prior to entering the fluidized bed the aluminum isopropoxide is vaporized and kept at a temperature less than the decomposition temperature of aluminum isopropoxide. Mechanical means are used to help increase the fluidization efficiency of the fluidized bed. After coating the phosphor particles for approximately 30 minutes the vaporized precursor material is shut off from the bed entrance and the oxygen flow rate to the fluidized bed is increased.

Abstract: A method of manufacturing a phosphor screen of a cathode ray tube having processes of forming a phosphor material on an inner surface of a cathode ray tube, forming a first intermediate film on the phosphor material, forming a second intermediate film having a baking temperature different from that of the first intermediate film on an upper surface of the first intermediate film, forming a metal back layer on an upper surface of the second intermediate layer, and baking a product at a predetermined baking temperature. Also, a method of manufacturing a phosphor screen of a cathode ray tube is disclosed, which has processes of forming a phosphor material on an inner surface of a cathode ray tube, forming an organic acid film on the phosphor material, forming an intermediate film on an upper surface of the organic acid film, forming a metal back layer on an upper surface of the intermediate layer, and baking a product at a predetermined baking temperature.

Abstract: Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of an aluminum oxide coating on individual particles of a phosphor powder while the particles are suspended in a fluidized bed. The particles in the fluidized bed are exposed to vaporized coating precursor material, preferably aluminum isopropoxide at a temperature above 300.degree. C. The bed is kept at as nearly an isothermal condition as possible. Prior to entering the fluidized bed the aluminum isopropoxide is vaporized and kept at a temperature less than the decomposition temperature of aluminum isopropoxide. Mechanical means are used to help increase the fluidization efficiency of the fluidized bed. After coating the phosphor particles for approximately 30 minutes the vaporized precursor material is shut off from the bed entrance and the oxygen flow rate to the fluidized bed is increased.

Abstract: A method for the metallizing of a luminescent screen comprises the following steps:the depositing of at least one luminophor coat, comprising at least one binder, on the inner face of the screen;the depositing of a sub-layer, consisting of at least one aqueous emulsion of a water-insoluble film-forming resin;the drying of the sub-layer and the heating of this screen to a temperature greater than the minimum temperature for the formation of the film;the depositing of a finishing layer;the drying of the finishing layer;the depositing of a metallic coating on the finishing layer, and,the volatilizing of the binders of the luminiphor screen, the sub-layer and the finishing layer, wherein the sub-layer and the finishing layer are made from the same aqueous emulsions of water-insoluble film-forming resins, said emulsions having a film-forming temperature of below 45.degree. C. and giving a continuous, thin, resistant, reflective and hydrophobic film.

Abstract: According to the present invention, there is provided a method for forming a color tube phosphor screen comprising the steps of forming a light-absorbing matrix having holes on a faceplate, coating a silica colloidal solution or an alumina colloidal solution containing a multivalent metal ion in said holes and washing said holes, and forming phosphor layers of three colors in said washed holes. The color tube phosphor screen formed through the method of the present invention has no phosphor residual, especially pigment residual.

Abstract: Disclosed is a radiation image storage panel, which comprises a support, a flame-sprayed layer and a stimulable phosphor layer formed by a vapor phase build-in method in succession and method for preparing the same. According to this invention, radiation images which are high in radiation sensitivity and sharpness can be obtained.

Abstract: A method for the metallization of a luminescent screen comprises the following steps:the depositing, in a known way, of a layer of at least one luminophor containing, among others, a binder on a transparent face panel;the depositing, on said layer, of a sub-layer consisting of an aqueous emulsion of a water-insoluble resin, the emulsion being neutral or alkaline and being capable of forming a hydrophobic film;the drying of the sub-layer;the depositing, on said sub-layer, of a coating consisting of an aqueous emulsion of a water-insoluble film-forming resin, said emulsion containing 0.1% to 4.0% by weight of hydrogen peroxide, 0.25% to 2.5% by weight of a water-soluble polymer and 0.1% to 1.0% by weight of colloidal silica,the drying of the coating;the depositing of a metallic layer, andthe volatilizing of the binder, the sub-layer and the coating.

Abstract: A method for regenerating a carbon slurry used to produce a black matrix-type phosphor screen of a cathode ray tube is disclosed, in which excess carbon slurry is collected after the completion of a carbon-coating process onto a cathode ray tube panel. This collected carbon slurry is regenerated by means of an ion-exchange resin.

Abstract: A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: The method of electrophotographically manufacturing a luminescent screen assembly on a substrate of a CRT, according to the present invention, includes the steps of coating the substrate with a conductive layer and overcoating the conductive layer with a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then, the selected areas of the photoconductive layer are developed with triboelectrically charged, dry-powdered, surface-treated screen structure materials. The improved process increases the adherence of the surface-treated materials to the photoconductive layer by contacting the surface-treated materials with a solvent to render the photoconductive layer and the materials tacky.

Abstract: An output phosphor film used in an output screen of an image intensifier is made of ZnS or (Zn, Cd)S host material and at least one activator element selected from the group consisting of Cu, Ag, Au, Al, and Cl. The phosphor film is formed on a face plate by means of chemical vapor-deposition, or physical vapor deposition in an inert-gas atmosphere having a pressure of 1 Pa or more, and is heat-treated. The formed phosphor film has hexagonal (Wurtzite-type) crystal and/or cubic (sphalerite-type) crystal structure. These crystals are orientated such that the (002) planes of the hexagonal crystals and/or the (111) planes of the cubic crystals are substantially parallel to the face plate.

Abstract: A color cathode ray tube includes an automatic convergence unit employing index elements on the reverse surface of a color-selective electrode. The paste used for forming the index elements has a composition consisting essentially of index phosphors, an inorganic adhesive and water to assure the adhesive force of the index elements onto the color selective electrode to prevent peeling of the index elements while facilitating the coating operation for formation of the index elements.

Abstract: A process is disclosed for pigmenting and coating a silver activated zinc sulfide phosphor and for imparting stir-in capabilities to the phosphor. The process comprises deagglomerating the phosphor, forming an aqueous slurry of phosphor particles, pigment particles, a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and a silica-based compound to produce a silica based coating on the phosphor particles, and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them and wherein the pigmented phosphor particles are coated with the silica-based coating. The process comprises also pigmenting the phosphor and imparting stir-in capabilities thereto by the process as described above without adding the coating agent to the slurry.

Abstract: A process is disclosed for binding pigment particles to phosphor particles which involves forming an aqueous slurry of phosphor particles, pigment particles, and a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them.

Abstract: A method for manufacturing a phosphor screen is disclosed, which includes the steps of coating a photo-sensitive phosphor paste on a necessary portion, exposing the coated photo-sensitive phosphor paste through a photo-mask, and developing the exposed phosphor paste thereby to form a phosphor stripe. Also, a photo-sensitive phosphor paste is disclosed, in which at least one glycol selected from glycol groups of 1, 2-propanediol, 1, 3-propanediol, 1, 3-butanediol, 2-methyl-2, 4-pentanediol and so on is contained with a weight ratio of 0.1 to 2.0 relative to a solid component of polyvinyl alcohol.

Abstract: A method of manufacturing a phosphor screen of uniform thickness on an inner surface of a panel of a cathode ray tube, comprising the steps of forming a powder-receptive adhesive pattern on the inner surface of a substantially rectangular panel having a skirt portion at the periphery, forming a sealed vessel consisting essentially of a container for containing phosphor powder and the panel by combining integrally the container and the panel so that the openings of both are opposed, and rotating the sealed container about an axis parallel to the inner surface of the panel.

Abstract: By adjusting the exposure dosages for the three primary color phosphors in the photolithographic process used to produce color CRTs for color television, standard whites of desired color temperatures are obtained. The aperture mask used in the photolithographic process is then discarded, and the CRT is operated as a monochrome tube in a standard receiver. Stable, rugged and portable color references are thus produced.

Abstract: In a color-picture tube, the conductive coating on the inside of the cone is a suspension without organic constituents. The conductive coating on the inside of the neck, which is contiguous to the conductive coating on the inside of the cone, consists of the aforementioned suspension with an addition of organic constituents. A sharp and scratch-resistant boundary between the conductive coating in the neck and the uncoated area of the neck is thus obtained.

Abstract: A color cathode ray tube is disclosed having a front assembly with a shadow mask characterized by having circular apertures at the mask center, and apertures at least in the mask periphery increasingly elongated radially outwardly as a function of distance from the center. The elongation of the apertures is effective to reduce or eliminate the distortion of the deposits on the mask periphery produced by diffraction effects during photoscreening, and to form phosphor deposits compatible in size and shape with the electron beamlets. The screen of the tube according to the invention may have circular or near-circular phosphor deposits thereon. Tube types to which the invention can be applied include the conventional curved-screen/curved-mask tube, and the substantially flat faceplate tube that has a foil shadow mask suspended in tension a predetermined distance from the screening surface.