Abstract: A color cathode-ray tube having a fluorescent screen of red-, blue- and green-emitting phosphors as image elements of a fluorescent layer, wherein at least one of said phosphors is coated with a double oxide of zinc and aluminum.

Abstract: The present invention provides a pigment-attached blue-emitting phosphor having attached a blue pigment which has fastness and chemical stability and is excellent in reflection spectrum characteristics, and a color cathode-ray tube having a blue-emitting fluorescent layer containing the blue pigment formed on the inner surface of a face plate.The present invention also provides a pigment-attached blue-emitting phosphor having a CoO.ZnO.SiO.sub.2 type blue pigment attached thereto, and a color cathode-ray tube provided with a blue-emitting fluorescent layer containing the blue pigment particles on the inner surface of a face plate.

Abstract: The following steps are performed in a method of lacquering the luminophore layer of a color picture tube:the luminophore layer is first prewetted,a first aqueous dispersion of a lacquer is applied to the prewetted luminophore layer,this first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film,a second aqueous dispersion is applied directly to the first lacquer film, where the said second aqueous dispersion has exactly the same components as the first dispersion and the concentration of the components in the second dispersion corresponds at least to a large extent to the concentration of these components in the first dispersion, andthis second dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a second lacquer film.

Abstract: This invention relates to a method of coating an inner surface of a funnel of a cathode ray tube with lining graphite acting as an inner conductive film between a screen portion and a high voltage side, i.e., an electron gun of the cathode ray tube. According to the method, the lining graphite is coated on the entire inner surface of the funnel with the exception of only an area of the portion of the surface, on which a getter or a frittable getter is located.

Abstract: Disclosed is an apparatus for applying a viscous liquid material and a method of controlling the discharge of the viscous liquid material. The apparatus has a movable nozzle having a port for discharging the viscous liquid material in a predetermined discharging direction. The nozzle is movably arranged to controllably trace a predetermined track. A shutter for controllably closing the port of the nozzle includes a shiftable member arranged on the port to move relative to the port between a first position and a second position along a plane which crosses the discharging direction of the nozzle so that the shiftable member release and covers the port of the nozzle. The present invention is suitable for application on a loop track or a closed path. In the method, it is preferred that the first position is located on the front side of the second position facing toward a direction in which the nozzle advances at termination of tracing with the viscous liquid material.

Abstract: A method for manufacturing a cathode ray tube is provided which comprises (a) spraying on the inner surface of a phosphor layer of a phosphor coated panel, an organic composition for forming a heat labile film, the organic composition being free of flammable or explosive organic solvents and including an initiator capable of forming a radical or cation when exposed to ultraviolet or electron rays and at least one resin containing at least one group consisting of acrylate, vinyl and diazo functional groups to form a heat labile film thereon; (b) exposing the heat labile film to ultraviolet or electron rays to from a hardened film layer; (c) forming an aluminum layer on a surface of the hardened film layer to form a screen; (d) sealing with heat the panel and a funnel to form a bulb with a mount including an electron gun and a stem, wherein the step of sealing to form a bulb decomposes the hardened film layer.

Abstract: A method of forming a phosphor screen in which a color filter layer is formed between a phosphor layer and an inner surface of a panel having a slurry in which a fine particle pigment and transparent particles are dispersed into a photosensitive liquid coated on the inner surface of the panel. Then, the color filter layer is formed by exposure and development. When the color filter layer that constitutes one portion of a phosphor screen of a color cathode ray tube is formed in this manner, an adhesive force with which the color filter layer is bonded onto the panel can be increased and a transmittance of the color filter layer can be improved.

Abstract: A cathode-ray tube phosphor is manufactured by coating, on the surfaces of phosphor particles, a mixture of a metal alginate containing at least one type of a metal selected from the group consisting of Zn, Al, and an alkali earth metal and at least one type of a water-soluble binder selected from the group consisting of gum arabic, gelatin, polymethacrylamide, and polyvinyl alcohol.

Abstract: The following steps are performed in a method of lacquering the luminophore layer of a colour picture tube:the luminophore layer is first prewetted,a first aqueous dispersion of a lacquer is applied to the prewetted luminophore layer,this first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film,a second aqueous dispersion is applied directly to the first lacquer film, where the said second aqueous dispersion has exactly the same components as the first dispersion and the concentration of the components in the second dispersion corresponds at least to a large extent to the concentration of these components in the first dispersion, andthis second dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a second lacquer film.

Abstract: A cathode ray tube having an antistatic and non-glare coating with a controlled and uniform degree of unevenness, can be produced by the process which comprises the steps of mixing an alcohol solution of an acid and a partially hydrolyzed alkylsilicate monomer with an amount of water being of at least four times greater than the number of moles of the alkylsilicate; applying the mixed solution to the outer surface of the panel by spin coating; followed by heating the resulting coating to a temperature in the range of 150.degree. to 200.degree. C. to form an antistatic and non-glare coating.

Abstract: A method of reclaiming a phosphor from a recovered phosphor slurry containing carbon, a bichromate, and polyvinyl alcohol, comprises, (a) a decomposition treatment step of adding an alkali to the recovered phosphor slurry after the slurry is heated to prepare a phosphor suspension having an alkali concentration of 0.5N or less in the slurry, and adding an oxidizing agent in an amount of 1.0 to 20.0 wt % with respect to a dry solid component of the suspension, (b) a weak acid treatment step of separating a phosphor from the suspension, and adding a weak acid to a suspension obtained by adding water to the separated phosphor, thereby adjusting a pH to be 3.0 to 5.0, and (c) a surface treatment step of treating the surface of the phosphor separated from the suspension.

Abstract: The present invention discloses a phosphor slurry composition for color Braun tubes comprising deionized water, phosphor powder, polyvinyl alcohol, sodium dichromate, ethyl silicate and zinc sulfate. A color Braun tube manufactured using a phosphor slurry composition of the present invention shows an excellent mirror reflection effect and high luminescent brightness.

Abstract: The present invention discloses a phosphor slurry composition for color Braun tubes comprising deionized water, phosphor powder, polyvinyl alcohol, sodium dichromate, ethyl silicate and zinc sulfate. A color Braun tube manufactured using a phosphor slurry composition of the present invention shows an excellent mirror reflection effect and high luminescent brightness.

Abstract: The present invention is directed to a cathode ray tube (CRT) having a surface with improved antistatic and antiglare properties and to a method for providing such improved properties. In the method of the invention, a solution of a silane and an epoxyalkylsilane in a solvent system comprising an alcohol, an acid and water is provided. The solution is applied to the surface of a cathode ray tube to impart antiglare and antistatic 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 a siloxane.

Abstract: A glare reducing coating for reflective-transmissive surfaces such as the glass screen of a television or CRT including a resin binder, plasticizer, solvent, and flatting agent. The resin binder is nitrocellulose or an acrylic resin or a mixture of nitrocellulose and acrylic resin, and the particular plasticizer used depends upon the choice of resin binder. Preferred plasticizers are polyesters, phthlates, and alkyds, the amount of plasticizer utilized being determined by the degree of flexibility desired for the dried coating. Silica is the preferred flatting agent, and any of a large number of common organic solvents are utilized.

Abstract: First and second robots function to hold first and second nozzles, respectively, which are supplied with respective fluid coating materials. The robots move the nozzles along respective different paths over a surface to which the fluid coating materials are to be applied. The fluid coating materials are uniformly and efficiently applied over the surface, without any irregularities, using the combination of nozzles and robots. In addition, the first robot has a nozzle transfer function to hold the second nozzle as well. As a result, the first robot may hold both nozzles for application of the coating materials.

Abstract: A method of forming a phosphor layer on the screen panel of a cathode-ray tube include the steps of charging phosphor slurry on the inside of the screen panel, rotating the screen panel to spread the phosphor slurry forming the phosphor layer, and exposing the screen panel to a light disposed in front of the inside of the screen panel and a plurality of lights disposed in front of the outside of the screen.

Abstract: A method of coating the bulb wall of a low-pressure mercury vapour discharge lamp with a luminescent layer, whereby a monomer and an initiator are added to a suspension comprising at least a luminescent material and a binder before a layer of this suspension is provided, which monomer is polymerized after drying of the suspension layer in order to fix the luminescent material and the binder.

Abstract: An antistatic coating composition, a manufacturing process thereof, and an antistatic and non-glare picture display screen are disclosed. The manufacturing process for the antistatic coating composition comprises steps of forming a silicate solution by partially hydrolysing a silicate substance, forming a conductive solution containing a conductive material which is formed by doping a molecular water-containing oxide or hydroxide of a soluble inorganic compound with an inorganic second compound, the second inorganic compound and the soluble inorganic compound being different, mixing the silicate solution and the conductive solution, and subjecting the mixture to a hydrolysis and to a polycondensation. According to the present invention, the antistatic and non-glare effects are greatly promoted.

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: A copper- and/or manganese-activated zinc sulfide electroluminescent phosphor is made by coating particles of a ferroelectric material with a very thin coating of the phosphor. The phosphor is made by reacting zinc- and copper- and/or manganese-containing species with hydrogen sulfide and hydrogen chloride gases in a low-temperature vapor state reaction.

Abstract: The present invention discloses a filming liquid composition for color Braun tubes comprising deionized water, an acrylic emulsion, ammonium oxalate, ethyl silicate, and titanium oxide, aluminium oxide or a mixture thereof. The color Braun tube manufactured using the filming liquid composition shows the characteristics of high reflection efficiency of the aluminium vacuum evaporation film and excellent luminescent brightness of the color Braun tube.

Abstract: A method of forming a partial protective coating on phosphor particles to improve initial power output and maintenance of fluorescent lamps made with the phosphor. The phosphor particles are fluidized in a bed and at least partially enveloped by a coating precursor material. Residence time of the phosphor particles in the fluidized bed is short so that the phosphor particles are only partially coated with the coating precursor material. The coating precursor material is reacted to form a protective coating over at least a portion of the surface of the phosphor particles. The partially-coated phosphor particles are then annealed to cause the protective coating to selectively cover at least a portion of certain sites on the surface of the phosphor particles.

Abstract: A method for manufacturing a phosphor screen used in a color CRT takes the steps of multilayering a red phosphor layer, a green phosphor layer, a blue phosphor layer, and a non-luminescent layer being laid between the adjacent color phosphor layer, cutting the multilayered block into filmy pieces toward the thickness, adhering or pressurizing the filmy cut pieces on a glass plate for front panel of the color CRT, and burning the cut pieces. This method makes it possible to efficiently manufacture a high-definition and high-resolution color phosphor screen and form fine RGB stripes. This method, thus, may apply to a small-sized CRT about which the realization of the high-definition and high-resolution color phosphor screen has been difficult.

Abstract: The present invention is directed to a cathode ray tube (CRT) having a surface with improved antistatic and antiglare properties and to a method for providing such improved properties. In the method of the invention, a solution of an alkoxyilane in a solvent system of an alcohol, chloride ion and water is provided. The solution is applied to the surface of a cathode ray tube to impart antiglare and antistatic properties to the surface. Thereafter, the CRT with the saline applied is cured at an elevated temperature for a period of time sufficient to cause the saline to react and be converted to a siloxane.

Abstract: The present invention is directed to a cathode ray tube (CRT) having a surface with improved antistatic and antiglare properties and to a method for providing such improved properties. In the method of the invention, a solution of a silane selected from a chlorinated silane and an alkoxysilane in a solvent system of on alcohol and chloride ion is provided. The solution is applied to the surface of a cathode ray tube to impart antiglare and antistatic 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 a siloxane.

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: A coating apparatus for coating a sensitizing solution onto a surface of an elongated metal plate includes a transfer roller and a coating nozzle for coating the sensitizing solution on a circumferential surface of the roller. The circumferential surface of the transfer roller is in contact with the surface of the metal plate running in the longitudinal direction under a predetermined tension. The transfer roller is rotated in a direction opposite to that in which the metal plate is run, so that the coated sensitizing solution is transferred from the circumferential surface of the transfer roller on the surface of the metal plate.

Abstract: Low porosity titania forms containing only a small amount of hydroxyl groups and possessing a high refractive index which are property stable regardless of humidity level and which prohibit electrical and gas leakage and optical loss, are obtained in a sol-gel process by rapidly heating to curing temperature, e.g. at a rate of 8000.degree. C./min. One application provides more stable, longer-lasting sol-gel prepared optical interference filters. Other applications provide capacitors with high capacitance and optical planar waveguides.

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: Phosphor particles are coated with a continuous, non-particulate, conformal coating of a metal oxide by suspending the phosphor particles in a gel solution containing a metal alkoxide. The gel suspension is then gelled after which the gelled suspension is dried, during which process the metal alkoxide is converted to metal oxide which coats the particles. Such coated phosphor particles can improve maintenance of lamps in which they are employed.

Abstract: A luminescent storage screen, in which a latent x-ray image is stored, is read-out using stimulating radiation at a first wavelength, which causes light at a second wavelength to be emitted by the screen. The stimulable phosphor is transparent in the range of the two wavelengths. The stimulable phosphor is a doped alkali halide, such as a thallium-doped rubidium-bromide.

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: Method and apparatus for producing separated columns of scintillation layer material, for use in detection of X-rays and high energy charged particles with improved spatial resolution. A pattern of ridges or projections is formed on one surface of a substrate layer or in a thin polyimide layer, and the scintillation layer is grown at controlled temperature and growth rate on the ridge-containing material. The scintillation material preferentially forms cylinders or columns, separated by gaps conforming to the pattern of ridges, and these columns direct most of the light produced in the scintillation layer along individual columns for subsequent detection in a photodiode layer. The gaps may be filled with a light-absorbing material to further enhance the spatial resolution of the particle detector.

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 method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the alumina protective coating of a phosphor is described. The method involves the heating a fluidized alumina coated phosphor in a fluidized bed at a temperature and for a period of time sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After heating the fluidized phosphor is cooled and then added to a water-based suspension. The conditions for treating a manganese activated zinc silicate phosphor having a protective alumina coating are heating the fluidized phosphor at a temperature between about 700.degree. C. and about 850.degree. C. for a period of time from about 15 minutes to about 20 hours.A fluorescent lamp containing the phosphor prepared by the above described method is also described.

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: 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: Anti-veiling-glare glass input window for an optical device. The window has throughout a shallow surface layer over its peripheral surfaces radiation absorbent free-metal-induced color centers. A method for preparation of such a window, such is particularly suited to be used as an input window for an image intensifier, involves pre-shaping the window from clear glass and forming color centers in a shallow surface layer over at least the peripheral surfaces of the window. If the clear glass contains reduceable metal oxides the color centers are formed by subjecting at least the peripheral surfaces of the clear glass to a reducing atmosphere at a temperature high enough to cause the reducing atmospheres reducing component to diffuse into a shallow surface layer of the window and to reduce the metal oxides to free metal atoms.

Abstract: A high-quality projection cathode ray tube is for projecting the image, displayed on a fluorescent surface, as an enlarged image on a screen in front of the fluorescent surface through a projection lens disposed at a given distance ahead. On the inner surface of a face panel, a multilayer optical interference film including optical thin film layers of alternately superimposed high refractive and low refracte index material is provided. The outermost surface of the multilayer optical interference film is coated with a film of an inorganic material such as silicon dioxide which is optically transparent and stable with respect to the impact of an electron beam. The thickness of the transparent film is not less than 1.0 .mu.m. Even an electron beam having a high energy which has passed through the gaps of the phosphor layer loses the energy in this protective film.

Abstract: A method has been found which reduces substantially the degradation of the red phosphor, Y.sub.2 O.sub.3 :Eu, in water base fluorescent lamp suspension, thereby prolonging the shelf life of triphosphor suspensions. The method of the invention comprises forming a protective coating around individual particles of europium-doped yttrium oxide phosphor to inhibit degradation of europium-doped yttrium oxide phosphor in a water base phosphor coating suspension, the protective coating comprising an inorganic material and being of sufficient thickness to prevent the europium-doped yttrium oxide phosphor from reacting with the coating suspension. A preferred coating material is gamma-alumina.

Abstract: A uniform and dense (non-porous) thin film of metal sulfide with excellent electric characteristics can be prepared by making into a fine mist an organic compound alone or dissolved in a solvent the organic compound containing at least one metal-sulfur bond in the structure thereof, and spraying the organic compound on a heated substrate.

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 providing intelligible markings that are virtually invisible to the unaided eye on the surface of an article, comprises: applying onto the surface, by a jet printing process, a marking medium comprising a compatible liquid or viscous substance containing an organic laser dye (typically IR-125 in a concentration of about 0.005 to 0.05 percent by weight of the medium) that is poorly absorptive of radiation in the visible range of about 400 to 700 nanometers, is highly absorptive of radiation in the near infrared range of at least about 750 nanometers in wavelength (typically about 750 to 900 nanometers), and fluoresces in response to radiation excitation in the said near infrared range to produce fluorescent radiation of wavelengths longer than the wavelength of the excitation (typically in the range of about 800 to 1100 nanometers). Other useful laser dyes may comprise DTTCI, DNTTCI, HDITCI, DDTTCI, IR-140, DDCI-4, or IR-132.

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: Anti-veiling-glare glass input window for an optical device. The window has throughout a shallow surface layer over its peripheral surfaces radiation absorbent free-metal-induced color centers. A method for preparation of such a window, which is particularly suited to be used as an input window for an image intensifier, involves preshaping the window from a clear glass and forming color centers in a shallow surface layer over at least the peripheral surfaces of the window. If the clear glass contains reduceable metal oxides the color centers are formed by subjecting at least the peripheral surfaces of the clear glass to a reducing atmosphere at a temperature high enough to cause the reducing atmospheres reducing component to diffuse into a shallow surface layer of the window and to reduce the metal oxides to free metal atoms.