Abstract: A light-transmitting layer is formed on a transparent glass panel, the light-transmitting layer having a larger refractive index than that of the glass panel, and a light-absorbing layer having a light-transmitting region is formed on the light-transmitting layer. The light reflected from the interface of the glass panel and the light-absorbing layer is effectively attenuated by the light-transmitting layer, so that it is possible to obtain an excellent image having a considerably strong contrast.

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: In a phosphor screen of cathode ray tube produced by forming a lacquer film between phosphor layers and a metallic film, when the lacquer film is formed by using a composition comprising a resin component, an organic solvent and a plasticizer in an amount of about 12 to 60% by weight based on the weight of the resin component, the resulting phosphor screen is excellent in adhesive strength of the metallic film and can prevent color mixing and halation.

Abstract: Disclosed herein is a method of producing a phosphor screen of color picture tube wherein a light absorbing material is applied onto the inner surface of a panel, a shadow mask is provided, the surface of film of the light absorbing material is scanned and irradiated with a laser beam via the shadow mask so that portions of the light absorbing material irradiated with the laser beam are heated and burned, thereby to form a black matrix. According to this method, the number of steps for forming the black matrix is decreased, and the quality and yield of the phosphor screen are increased.

Abstract: Light exposure apparatus comprises a light source, a spectral filter perivious to light of a prescribed wavelength range, a glass member whose cut-off frequency in the prescribed wavelength range is variable with temperature, and a temperature control for controlling the temperature of the glass member. Intensity of the light from the light source, passing through the spectral filter and glass member, and impinging upon the surface subject to light-exposure is controlled by the temperature control.

Abstract: An extra-high pressure mercury discharge lamp comprising an end-sealed glass tube shaped to provide a long arc type tube, mercury contained in the both ends respectively of the glass tube, a pair of electrodes provided in the both ends respectively of the glass tube, each of the electrodes including one end portion extending toward the exterior from the associated end of the glass tube, an intermediate portion immersed in the mercury, and the other end portion extending toward the interior beyond the surface of the mercury facing toward the middle of the glass tube, and a power source connected between the externally extending portions of the electrode pair to supply power thereacross, the other or internally extending portions of the electrode pair having a length so selected that the mercury discharge lamp emits light of a sharp emission profile suitable for the exposure of a very fine pattern.

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: 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: The photosensitive resin which exhibits stickiness by photo-reaction is added with a binder which does not substantially raise dark reaction, and a resultant mixture is applied onto the inner surface of face panel of the color picture tube to form a film. Portion of the film where powdery material is going to be applied is exposed to light and rendered sticky. Phosphor powder, when used as the powdery material, is applied to the sticky portion and adhered thereto to form a fluorescent screen.

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: In a method of forming a fluorescent screen on the inner surface of a face plate of a color picture tube wherein a film of photosensitive composition consisting essentially of a diazonium salt, the portions of the films to be deposited with phosphors are exposed to light through a color selection electrode so as to impart sticky property to the portions by a photoreaction and moisture in atmosphere and then a powder of phosphors is deposited by utilizing the sticky property, a photosensitive binder is incorporated into photosensitive film which undergoes a cross-linkage reaction with the photosensitive composition, thus rendering the mixture insoluble in water.

Abstract: A light exposing prism system for use in light exposure process for forming a phosphor plane of a color picture tube is disclosed. The prism system is arranged between a panel of the color picture tube and a linear exposing light source and includes a plurality of small prisms which are arranged transversely to an axial line extending through a center of the panel and a center of the light source and to a longitudinal axis of the light source. The prism system is adapted to be oscillated in the direction of arrangement of the small prisms. Pitch of the arrangement of the small prisms is within a range of 0.05 mm to 3.0 mm, preferably 1.0 mm to 3.0 mm.

Abstract: An exposure method and apparatus for forming phosphor stripes or black matrix stripes on the inner surface of a face plate of a stripe phosphor screen type color picture tube or CRT (cathode-ray tube), in which a single linear light source is used as the exposure light source, and a prism device including many juxtaposed prisms is disposed between the linear light source and the face plate. The taper angle of the prisms is continuously changed so that the single linear light source can be observed as a plurality of discontinuous virtual linear light sources at whatever point on the inner surface of the face plate, and the virtual linear light sources have a most suitable center-to-center distance at individual positions on the face plate.

Abstract: A method of forming a stripe type phosphor screen on inner surface of a face plate of a color picture tube or CRT through the irradiation with light stripes. A single linear light source is employed in combination with a plurality of juxtaposed prisms between the face plate and the linear light source with the taper angles of the prisms being continuously varied so that a plurality of virtual linear light sources may be observed from any points on the inner surface of the face plate with the distances between mid-points of the virtual linear light sources taking optimum values at respective positions on the inner surface of the face plate. With such arrangement, an improved phosphor screen composed of phosphor stripes of three colors having uniform stripe width can be formed over the whole inner surface of the face plate by using a single linear light source without requiring driving apparatus for moving the light source to different positions.

Abstract: A method for manufacturing a fluorescent screen of a color picture tube by the steps of forming a coating of opto-hardening material on the inner surface of the faceplate of the panel of a color picture tube and exposing to a light and hardening selectively the coating thereby to form a matrix of stripes of the opto-hardening material, in which the selective exposure is performed by projecting a light derived from a light source having a predetermined width from each of at least two positions which are separated from the inner surface of the faceplate by a predetermined distance and also separated from each other onto the coating of the opto-hardening material formed on the faceplate through a slot of a predetermined width of a mask located between the inner surface of the faceplate and the light source, whereby the width of the stripe changes little even when the luminous intensity of the light source changes.