Abstract:
PROBLEM TO BE SOLVED: To provide an electrophotographic screening method manufacturing a uniform luminescent screen by providing a substantially uniform OPC layer during 8 seconds or less. SOLUTION: The manufacturing method of a luminescent screen assembly includes a step overcoating an interior surface of a faceplate for forming a volatile organic conductive (OC) layer, and a step coating the OC layer for forming a volatile organic photoconductive (OPC) layer. The step of overcoating the OC layer is improved by grounding the OC layer, providing an OPC solution comprising a resin, an electron donor material, an electron acceptor material, and a mixture of two solvents having different boiling points, and spraying electrostatically-charged droplets of the OPC solution onto the OC layer, with at least one electrostatic spray gun, to provide an OPC layer, having uniform thickness, overlying the OC layer. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
A spray module 40 for manufacturing a cathode-ray tube (CRT) 10 comprises an enclosure 42 having sidewalls 44, a base 46 attached to the sidewalls 44, for closing one end thereof, and a panel support 48 having an opening, 50 therethrough. The panel support 48 is attached to an opposite end of the sidewalls 44. The spray module 40 has at least one electrostatic spray gun 36 therein for spraying charged screen structure material through the opening 50 in the panel support 48 and onto an interior surface of a faceplate panel 12 of the CRT 10. The spray module 40 includes a primary shield assembly 55 disposed within the enclosure 42 and extending through the opening 50 in the panel support 48. A secondary shield assembly 56 also is disposed within the enclosure 42 The primary and secondary shield assemblies 55 and 56, respectively, direct the charged screen structure material toward the interior surface of the panel 12, thereby increasing the transfer efficiency of the spray gun 36. A collecting tray 54 also is utilized to catch the spent spray which falls to the bottom of the spray module 40. The tray 54 is inclined toward a drain 100 that directs the spent material out of the spray module 40.
Abstract:
The method involves coating the interior surface of the viewing faceplate to form a volatilizable organic conductive (OC) layer. The OC layer is overcoated to form a volatilizable organic photoconductive (OPC) layer. the OPC layer is electrostatically charged. Selected areas of the OPC layer light are exposed to form a charge image. The charge image is developed with phosphor material.
Abstract:
The method involves coating the interior surface of the viewing faceplate to form a volatilizable organic conductive (OC) layer. The OC layer is overcoated to form a volatilizable organic photoconductive (OPC) layer. the OPC layer is electrostatically charged. Selected areas of the OPC layer light are exposed to form a charge image. The charge image is developed with phosphor material.
Abstract:
In accordance with the present invention, a method of electrophotographically manufacturing a luminescent screen assembly for a color CRT 10 on an interior surface of a faceplate panel 12 is described. A volatilizable organic conductive (OC) layer 32 is provided on the interior surface of the panel and a volatilizable organic photoconductive (OPC) layer 34 overlies the OC layer 32. The method includes the steps of: establishing a substantially uniform electrostatic charge on the OPC layer; exposing selected areas of the OPC layer to visible light to affect the charge thereon; developing the selected areas of the OPC layer with a triboelectrically charged, dry-powdered, first color-emitting phosphor; sequentially repeating the charging, exposing and developing sequence for triboelectrically charged, dry-powdered, second and third color-emitting phosphors to form a luminescent screen comprising picture elements of triads of color-emitting phosphors; fixing the phosphors to the underlying OPC layer with a suitable fixative; filming the phosphors; and aluminizing the filmed phosphors. The present method is an improvement over prior methods because the fixing step utilizes an electrostatic spray to uniformly contact the phosphors and the underlying OPC layer with the fixative, without moving the phosphors.
Abstract:
Rozprašovací modul (40) pro výrobu obrazovky (10)obsahuje obal (42) opatrený bocními stenami (44),základnou (46), pripojenou k bocním stenám (44) pro uzavrení jednoho jeho konce, a nosník (48) panelu s pruchodem (50). Nosník (48) panelu je pripevnen k opacnému konci bocních sten (44). Rozprašovací modul (40) má alespon jednu elektrostatickou rozprašovací trysku (36) pro rozprašování nabitého materiálu struktury stínítka skrz pruchod (50) v nosníku (48) panelu a na vnitrní plochu celního panelu (12) obrazovky (10). Rozprašovací modul (40) zahrnuje primární stínicí soustavu (55) usporádanou vobalu (42) a táhnoucí se pruchodem (50) v nosníku(48) panelu. Sekundární stínicí soustava (56) je rovnež usporádána v obalu (42). Primární a sekundární stínicí soustavy (55 a 56) smerují nabitý materiál struktury stínítka smerem k vnitrní ploše celního panelu (12) a tím zvyšují úcinnost prenosu elektrostatické rozprašovací trysky (36). Sberací prostredek (54) se rovnež používá pro zachycení spotrebovaného rozprášeného materiálu, který dopadá nadno rozprašovacího modulu (40). Sberací prostredek (54) je sklonen ke kanálku (100), který smeruje spotrebovaný materiál ven z rozprašovacího modulu (40).
Abstract:
The method involves coating the interior surface of the viewing faceplate to form a volatilizable organic conductive (OC) layer. The OC layer is overcoated to form a volatilizable organic photoconductive (OPC) layer. the OPC layer is electrostatically charged. Selected areas of the OPC layer light are exposed to form a charge image. The charge image is developed with phosphor material.
Abstract:
A method of manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 for a color CRT 10 includes the steps of uniformly applying a solution of a material to form an organic conductive (OC) layer and overcoating the OC layer with a solution to form an organic photoconductive (OPC) layer, on the interior surface of the faceplate panel. The OPC layer 34 is conditioned by directing a stream of dry gas thereon to warm the OPC layer to a preheat temperature, while maintaining the panel at a panel temperature less than the preheat temperature. The OPC layer is exposed to IR radiation to rapidly increase the temperature of the OPC layer to a curing temperature, greater than the preheat temperature, to remove some of the volatilizable constituents from the OPC layer, without substantially increasing the temperature of the panel. The OPC layer is then cooled by directing at least one stream of cool gas onto the surface thereof, to lower the temperature of the OPC layer to a subsequent processing temperature.
Abstract:
A method of manufacturing a luminescent screen assembly on an interior surface of a faceplate panel 12 for a color CRT 10 includes the steps of uniformly applying a solution of a material to form an organic conductive (OC) layer and overcoating the OC layer with a solution to form an organic photoconductive (OPC) layer, on the interior surface of the faceplate panel. The OPC layer 34 is conditioned by directing a stream of dry gas thereon to warm the OPC layer to a preheat temperature, while maintaining the panel at a panel temperature less than the preheat temperature. The OPC layer is exposed to IR radiation to rapidly increase the temperature of the OPC layer to a curing temperature, greater than the preheat temperature, to remove some of the volatilizable constituents from the OPC layer, without substantially increasing the temperature of the panel. The OPC layer is then cooled by directing at least one stream of cool gas onto the surface thereof, to lower the temperature of the OPC layer to a subsequent processing temperature.
Abstract:
Un método para fabricar un conjunto de pantalla luminiscente en una superficie interior de un panel de placa frontal para un CRT de color incluye los pasos de aplicar uniformemente una solucion de un material, a fin de formar una capa orgánica conductiva (OC) y sobrecubrir la capa OC con una solucion, con el proposito de formar una capa fotoconductiva orgánica (OPC), en la superficie interior del panel de placa frontal. La capa OPC es acondicionada dirigiendo una corriente de gas seco en la misma para calentar la capa OPC a una temperatura de precalentamiento, manteniendo al mismo tiempo el panel a una temperatura del panel menor que la tempea a radiacion infrarroja para incrementar rápidamente la temperatura de la capa OPC a una temperatura de curado, mayor que la temperatura de precalentamiento, a fin de remover parte de los constituyentes volatilizables de la capa OPC, sin incrementar sustancialmente la temperatura del panel. Entonces, la capa OPC es enfriada dirigiendo por lo menos, una corriente de gas frío a la superficie de la misma, a fin de disminuir la temperatura de la capa OPC a una temperatura de procesamiento subsecuente.