Abstract:
PURPOSE: A non-gelling, stable composition for forming a fluorescent film of a picture tube, employing a highly luminescent CaS fluorescent material, which is prepd. by dispersing a specified photosensitive resin and a CaS fluorescent powder having the surface coated with an org. resin film in an aq. medium. CONSTITUTION: A photosensitive resin contg. repeating units (1) and (2) respectively of formulas I and II (wherein R is H, alkyl or lower hydroxyalkyl; X - is an anion of a strong acid) and a CaS fluorescent powder having the surface coated with an org. resin film are dispersed in an aq. medium. It is pref. for said photosensitive resin to have 0.5W10mol% repeating unit (1) and the balance primarily consists of the repeating unit (2). In forming a fluorescent film with said composition, a fluorescent film with a desired pattern is formed by applying the composition to the inner surface of the faceplate panel of a picture tube and exposing it in the desired pattern followed by development and printing. COPYRIGHT: (C)1984,JPO&Japio
Abstract:
PURPOSE:To enable a sufficiently small resist pattern as well as a black matrix pattern having a small dot diameter or stripe diameter to be formed even if the diameter of a light source is small, and to prevent generation of exfoliated part of graphite powder by performing as an intermediate treatment a process which forms a water-soluble high molecular film containing metal oxide at the recess of a horn pattern-like photoresist film. CONSTITUTION:A slurry which is prepared by dispersing the predetermined amount of water-soluble resin and metal oxide into water is spread onto the internal surface of a face plate panel 3 and then dried in order to form a water-soluble high molecular film. In this case, consequently, the recess of the horn pattern-like photoresist film 6 and the internal surface of the face plate panel are covered with the water-soluble high molecular film. The amount of these water-soluble resins to be mixed is preferred to be 1-10wt% basing on the total amount of the slurry. Next, the water-soluble high molecular film is developed in order to remove said film. After this developing treatment, only the water-soluble high molecular film which is formed in the recess of said horn pattern-like photoresist film remains without being removed. Consequently, non- luminous absorptive substance to be spread in next process is never stuck directly onto the internal surface of the face plate panel in the recess.
Abstract:
PURPOSE:To check a docking phenomenon of a phosphor stripe by a method wherein a photosensitive resin film having a reciprocity law failure characteristic is formed, a photocrosslinking agent in the film is exposed without photocrosslinking a resin component in the film and the film of a noncolor black substance is formed after being developed. CONSTITUTION:A photosensitive resin having a reciprocity law failure is thinly applied to the inside panel face of a picture tube while being dried to form a resin film. Next, a light source position is displaced through a shadow mask in order to irradiate only the position, whereon a black stripe is to be formed, by light followed by being exposed. Then the shadow mask is removed in order to expose totally the panel inside and after performing development in order to selectively remove a part of the resin film located in the position where a photoabsorbing layer to be formed, the film of a noncolor black substance is formed on the resin film located in the position desired to be applied by a phosphor. Subsequently, exfoliation is performed by a sulfamic acid water solution or the like in order to form a black stripe.
Abstract:
PROBLEM TO BE SOLVED: To prevent damage to the filter layer by the mist of colloidal silica solution upon coating the silica solution over a filter layer and eliminating the fall-out of phosphors over the filter layer whose luminescent colors are the same as those of residual of phosphors having different luminescent colors. SOLUTION: This forming method comprises: a step of forming a filter pattern composed of a pigment layer, including plural colors such as blue, green, and red on the inner surface of a panel; a step of coating and drying acidified colloidal silica solution 7 over the panel by spin coat method or the like while sucking a portion near the coated portion or positioning it in the suction atmosphere by a duct, etc., and exhausting/removing the mist of the silica solution 7; and a step of forming a phosphor layer having luminescent color corresponding to a pigment layer in the lower layer over the silica layer thus formed.
Abstract:
PROBLEM TO BE SOLVED: To prevent deterioration of brightness, mixed color, or white uniformity of a color image receiving tube provided with its fluorescent substrate surface having a phosphor layer with a color filter. SOLUTION: A color image receiving tube is provided with phosphor surface 3 having three-color phosphor layers 12B, 12G, and 12R for emitting blue, green, and red on the inner surface of a panel 1 and is composed of a phosphor layer having a filter for which at least the blue phosphor layer 12B of these three- color phosphor layers selectively absorbs the light in a specific wave length area to an external light. For each phosphor constituting its three-color phosphor layer, the average particulate diameter for the blue phosphor is 6.4±0.3μm, and the average particulate diameter for the green and red phosphors is 5.5±0.5μm.
Abstract:
PURPOSE:To form a metal film with no coming off on a fluorescent screen and high evenness. CONSTITUTION:A fluorescent screen forming method for a color cathode ray tube is provided in such a way that a resin film 30 whose main component is acrylic resin is formed on fluorescent layers 9B, 9G, 9R formed on the inner surface of a panel 2, a metal film 32 is formed on the resin film 30, then a black heat absorbing layer 11 is formed on the metal film 32. The resin film 30 is formed by applying a solution prepared by dissolving 1.0-3.2wt% acrylic resin in a solvent mainly comprising toluene.
Abstract:
PURPOSE:To reduce the elastic reflection of electron beams on a shadow mask surface and to prevent the heating expansion of a shadow mask, by using the oxide of Co and Ni as a black system inorganic pigment being contained in a porous layer being formed on the surface of the shadow mask. CONSTITUTION:Electron beams are radiated to and struck against a phosphor through transmission holes 7a in the shadow mask 7 of a color image receiving tube for causing light emission. A solution prepared by dispersing a black system inorganic pigment into a metal alkoxide system solvent, is applied to the surface of the shadow mask 7 for being dried to form a porous layer 13 thereon. On this occasion, a pigment made of (Fe, Mn, Co, Ni) O having the oxide of Co and Ni contained therein as the inorganic pigment, is used. This structure enables the elastic reflection of the electron beams on the surface of the shadow mask to be reduced so that the heating expansion of the shadow mask is suppressed, further with the improvement of residual emission characteristic in an electron gun.
Abstract:
PURPOSE:To provide a cathode ray tube with high luminance, giving color picture tubes causing no contrast reduction, having a fluorescent surface containing a zinc sulfide green luminescent fluophor containing Ni and copper as an activating agent each in specified amount. CONSTITUTION:The objective cathode ray tube having a fluorescent surface containing a zinc sulfide green luminescent fluophor, etc., containing 0.1-5ppm of Ni and yppm {y=aX[a is -80 to -60; X is mean particle size of fluophor (mum)]} of copper as an activating agent (at least Ni). For said fluophor, in case its mean particle size is 5-10 (pref., 7.5-9.5)mum, the optimum activating concentration of the copper is 70-350 (pref., 100-150)ppm.
Abstract:
PURPOSE:To acquire a cathode ray tube excellent in heat and water resistance, an reliable against heat shocks by connecting the metal band of the cathode ray tube conductively to a conductive layer, applying a solution containing a particular silane compound to the surface of the conductive layer, and there after producing the conductive layer consisting of a conductive ceramic membrane composed of a binder containing amorphous silicon dioxide or silicon hydride. CONSTITUTION:The interior of the external envelop 2 of an cathode ray tube 1 is evacuated, and a neck 3 and a cone 4 are connected to the external envelop 2. Also the external surface of the faceplate 5 of the cathode ray tube 1 is covered with a antistatic membrane 7, and the antistatic membrane 7 is con nected through a conductive layer 8 to a metal band 6. The surface on which this conductive membrane 7 is formed is coated with a solution that contains a silane compound with at least an -N=C=O or -SH radical as its end radical, and thereafter the conductive layer made of a conductive ceramic membrane consisting of a binder containing amorphous silicon dioxide or silicon hydride is formed so that sufficiently reliable resistance against heat shocks may be secured.
Abstract:
PURPOSE:To obtain a color picture tube of a high brightness, a high contrast, and a high picture quality, by adding a green paint to green phosphors, a blue paint to blue phosphors, and a red paint to red phosphors of the phosphors at specific amounts respectively. CONSTITUTION:Of three color phosphor layers 11R, 11G, and 11B of a phosphor screen, at least the green phosphor layer 11G is formed of a green phosphor covered with a filter substance consisting of a blue paint, and the phosphor and the filter substance are furnished in the phosphor layer 11G, The adding amount of the blue paint is less than 1% to the phosphor. The blue phosphor layer may be composed of a phosphor a very small amount of a blue paint is added to adjust the body color of the phosphor screen, and its adding amount is less than 1% to the phosphor. Moreover, the red phosphor layer is also added with a very small amount of a red paint, and its amount is less than 0.1%. In such a way, an yellowish color phenomenon of the body color is suppressed, and a color picture tube of a high brightness, a high contrast, and with no blackish level of inharmonious feeling can be obtained.