Abstract: A photosensitive composition comprising (1) at least one diazonium compound selected from among salts and double salts of diazonium ions represented by the general formulas: ##STR1## wherein A stands for a substituent selected from among ##STR2## wherein R.sub.1 and R.sub.2 each stand for an alkyl or benzyl group with the proviso that the total number of carbon atoms of R.sub.1 and R.sub.2 is 8 to 16, and (2) at least one nitrate selected from the group consisting of calcium nitrate and magnesium nitrate and a pattern forming process using such a composition.This composition gets sticky upon exposure to light.

Abstract: A fluorescent screen of a color picture tube is manufactured by the steps of forming a film of substance which becomes sticky when exposed to light on an inner surface of a panel of the tube, exposing predetermined portion of the film through a shadow mask to render sticky the exposed portions, repeatedly applying powders of phosphors of respective colors onto the portions which became sticky so as to form phosphor picture elements of respective colors, exposing portions of the film other than the predetermined portions to render them sticky, and applying a powder of graphite to the portions other than the predetermined portions to form a black matrix film.

Abstract: In an index type color picture tube including a stripe type fluorescent screen having stripe-shaped phosphor layers for green, blue and red color and a stripe-shaped phosphor layer for index detection, the phosphor for red color phosphor layer comprises a Y.sub.2 O.sub.2 S:Eu phosphor containing 0.01 to 3 ppm of either one or both of Tb and Pr.

Abstract: A method of forming a color picture tube fluorescent screen by so-called dry process. After a photosticky substance mainly containing a diazonium compound is coated on a panel inner face, phosphor is adhered to portions of the compound which have been exposed to light through a color selection electrode and rendered sticky, and surplus phosphor applied on unexposed portions of the compound is removed, the above steps being consecutively repeated for phosphors of three colors to form picture elements of triads of three color phosphors on the panel inner face. The panel inner face is then treated with an aqueous solution containing at least polymer coagulant.

Abstract: A method of manufacturing a cathode-ray tube is provided, wherein in forming a phosphor screen on the inner surface of a faceplate of the cathode-ray tube, the inner surface of the faceplate faces downward while the faceplate is rotated about the axis of the cathode-ray tube, and a liquid material for forming a film is sprayed from a supply nozzle arranged to be substantially perpendicular to the inner surface of the faceplate so as to spray the liquid material on the inner surface of the faceplate along all directions, thereby forming a uniform film throughout the inner surface of the faceplate.

Abstract: A water-soluble, positive-working photoresist composition is disclosed which comprises water-soluble aromatic diazonium salt, water-soluble phenolic compound, and water-soluble polymeric compound. When the film of this composition is irradiated with a pattern of actinic ray and then brought into contact with an alkaline gas or solution, the coating of unexposed areas hardens to become water-insoluble. Preferably, when the film is brought into contact with a suspension of powder or dry powder after being hardened, a positive pattern of powder is obtained by the development with water.

Abstract: In a curved tube type ultra high pressure mercury discharge lamp device of the type comprising an arcuate glass tube, a quantity of mercury contained in both ends of the glass tube and electrodes projecting into the glass tube beyond surfaces of the mercury for creating electric discharge between the electrodes, throttles are formed on an inner surface of the glass tube near the electrodes. The throttles have diameters smaller than an inner diameter of the glass tube and the mercury is contained in spaces between the throttles and the both ends of the glass tube.

Abstract: For formation of a cathode-ray tube phosphor screen by causing a fluorescent material to adhere to a particle-accepting sticky surface formed uniformly on the inner surface of a face plate, phosphor particles are placed on the inner surface of the face plate and caused to slide physically over the particle-accepting sticky surface so as to be stuck thereto.

Abstract: An amphoteric surfactant is added to a photosensitive composition consisting essentially of an aromatic diazonium salt and used to prepare a fluorescent screen of a color picture tube.

Abstract: A pattern forming method comprising a step of disposing a substrate with a coated film of photosensitive composition and a mask having a predetermined pattern in a first liquid which does not dissolve said coated film of photosensitive composition, and a step of exposing said coated film to light through said mask. An apparatus for attaining this method is also disclosed. The influence of dust can be readily avoided and an image with high resolution is obtained.

Abstract: A fluorescent screen of a cathode ray tube is prepared by forming a film of photosensitive sticky substance, for example, an aqueous solution of a copolymer of a complex salt of diazonium salt and zinc chloride, on an inner surface of a face plate of the tube, exposing the film to light to render portions thereof sticky, applying a powdery substance, for example, phosphors of three colors, onto the film to cause the powdery substance to adhere to the portions of the film rendered sticky, removing excess powder to form a film pattern of the powdery substance, causing the substance responsible for stickiness to ooze out onto the film pattern, applying another powdery substance, for example, graphite onto the film pattern and removing an excess of another powder substance, thus forming the fluorescent screen. The invention is applicable to the manufacture of a fluorescent screen for use in a color picture tube, a monochromatic picture tube and a penetration tube.

Abstract: When a low molecular weight dihydric or trihydric alcohol is added to a photoresist composition comprising a water-soluble polymer substance and a diazide photo-crosslinking agent, the fluidity of the composition is improved and the drying speed is moderately retarded and it enables the formation of a photoresist layer having a uniform film thickness and uniform drying degree. The said alcohol is exemplified by ethylene glycol, glycerol, etc. and is preferably added in an amount of 5-300 parts by weight per 100 parts by weight of the water-soluble polymer substance.

Abstract: In a method of forming a fluorescent screen of a color picture tube by a dry process, the method comprises a first step of precoating an emulsion containing a powder of acryl resin on an inner surface of a face plate of the color picture tube to form a primary coating, a second step of coating on the primary coating a photosensitive composition consisting essentially of a diazonium salt to form a thin film, a third step of exposing to light a selected portion of the thin film to render the same to become adhesive, a fourth step of depositing a powder of a phosphor on the selected portion to form a phosphor layer of a first color and a fifth step of repeating the third and fourth steps to form phosphor layers of second and third colors.

Abstract: In forming a fluorescent screen for a color picture tube having triads of phosphor materials of the three primary colors arranged in a predetermined pattern on the inner surface of a panel, a photosensitive film which exhibits stickiness when exposed to a threshold amount of light is formed on the inner surface of the panel. Locations of the photosensitive film where the three color phosphor materials respectively occupy are exposed to light from a light source through a shadow mask mounted to the panel. The amount of exposure light for a first color phosphor material is the threshold or above and that for second and third phosphor materials is below the threshold. After completion of the light exposures for the first to third color phosphor materials through the shadow mask, the shadow mask is dismounted from the panel and the first color phosphor material is deposited onto the photosensitive film.

Abstract: A process for forming a phosphor screen of a color picture tube comprising forming a thin layer using a photosensitive composition which contains an aromatic diazonium salt as a photosensitive component and produces tackiness by exposure to actinic light on the surface of the substrate and contacting the tackified thin layer after exposure to light with phosphor particles to form each phosphor layer for emitting color is improved by using as the phosphor particles those coated with at least one surface coating material selected from the group consisting of Zn(OH).sub.2, Zn.sub.3 (PO.sub.4).sub.2 and AlPO.sub.4 in shortening the contact time between the thin layer and the phosphor particles.

Abstract: A patternwise coated powder layer can be formed by a process comprising the steps of coating a photosensitive composition, which contains an aromatic diazonium salt as a photosensitive component and becomes sticky by exposure, onto the surface of a substrate to form a thin layer, subjecting the thin layer to patternwise exposure with actinic radiation to produce stickiness at the exposed area, and then contacting powder particles with the thin layer after exposure to make the thin layer to accept the powder particles according to the powder acceptability of the thin layer. According to this process, for example, the phosphor screen of a color picture tube can simply be produced.LIST OF PRIOR ART (37 CFR 1.56 (a))The following reference is cited to show the state of the art:Japanese Patent Laid-Open Publication No.

Abstract: In the manufacture of a striped phosphor screen for a black matrix type color picture tube, a pattern of stripes of a light-absorbing material is first formed on the faceplate of a glass envelope to define transparent striped windows thereon by a known process and then phosphor materials are applied to the striped windows by the use of a nozzle assembly having at least one nozzle capable of discharging a phosphor material, without owing to the photolighography. The coating apparatus comprises a nozzle assembly including one or more nozzles, drivers for effecting relative movement between the nozzle and the faceplate of the glass envelope in a first direction in the plane of the faceplate and perpendicular to the stripes, in a third direction perpendicular to the faceplate and in a second direction longitudinal of the stripes, sensors for detecting the position of the nozzle, generators for producing a positional error signal and control for controlling the position of the nozzle.

Abstract: A photosensitive film applied onto the inner surface of a faceplate of color picture tube is exposed to light through a shadow mask. The exposed portions of the photosensitive film are further hardened by the photo-cross linking property until they exhibit hydrophobic property. Since these further hardened portions repel a light absorbing material, for example graphite, the graphite adheres to only the portions of the faceplate between the exposed portions. The surplus light absorbing material deposited on the further hardened portions is removed by development, whereby a black matrix surface can be obtained having a pattern of the light absorbing material adhered to the faceplate.

Abstract: When a low molecular weight dihydric or trihydric alcohol is added to a photoresist composition comprising a water-soluble polymer substance and a bisazide photo-crosslinking agent, the fluidity of the composition is improved and the drying speed is moderately retarded and it enables the formation of a photoresist layer having a uniform film thickness and uniform drying degree. The said alcohol is exemplified by ethylene glycol, glycerol, etc. and is preferably added in an amount of 5-300 parts by weight per 100 parts by weight of the water-soluble polymer substance.

Abstract: A fluorescent screen of a cathode ray tube is prepared by forming a film of photosensitive sticky substance, for example, an aqueous solution of a copolymer of a complex salt of diazonium salt and zinc chloride, oN an inner surface of a face plate of the tube, exposing the film to light to render portions thereof sticky, applying a powdery substance, for example, .[.phosphors of three colors.]. .Iadd.graphite.Iaddend., onto the film to cause the powdery substance to adhere to the portions of the film rendered sticky, removing excess powder to form a film pattern of the powdery substance, causing the substance responsible for stickiness to ooze out onto the film pattern, applying another powdery substance, for example, .[.graphite.]. .Iadd.titanium oxide .Iaddend.onto the film pattern and removing an excess of another powder substance, thus forming the fluorescent screen.