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:
IN ACCORDANCE WITH THE PRESENT INVENTION, A METHOD FOR MANUFACTURING A COLOR CRT (10) HAVING A FACEPLATE PANEL (12) IS DISCLOSED. THE METHOD INCLUDES THE STEPS OF FORMING A PHOTORECEPTOR (36) ON AN INTERIOR SURFACE OF A VIEWING FACEPLATE (17); ESTABLISHING A SUBSTANTIALLY UNIFORM ELECTROSTATIC CHARGE ON THE PHOTORECEPTOR (36); AND EXPOSING SELECTED AREAS OF THE PHOTORECEPTOR (36) TO VISIBLE LIGHT TO FORM A LATENT CHARGE IMAGE. THE PROCESS FURTHER INCLUDES THE STEPS OF DEVELOPING THE LATENT CHARGE IMAGE ON THE PHOTORECEPTOR (36) BY DEPOSITING (212, 213, 214) THEREON CHARGED PHOSPHOR PARTICLES; MONITORING THE WIDTH (218) OF THE DEPOSITION OF THE CHARGED PHOSPHOR PARTICLES; AND TERMINATING THE DEPOSITION (226, 227, 228) OF THE CHARGED PHOSPHOR PARTICLES WHEN PREDETERMINED PROCESS PARAMETERS (222, 224) ARE SATISFIED. A PHOSPHOR DEPOSITION MONITOR (PDM) APPARATUS (90) FOR MONITORING THE DEPOSITION OF THE CHARGED PHOSPHOR PARTICLES ON THE LATENT CHARGE IMAGE, FORMED ON THE PHOTORECEPTOR (36), ALSO IS DESCRIBED. THE PDM APPARATUS (90) INCLUDES MONITORING MEANS (96, 99, 123) EXTERNAL TO THE VIEWING FACEPLATE (17) FOR MEASURING THE WIDTH (218) OF THE DEPOSITION OF THE CHARGED PHOSPHOR PARTICLES. CONTROL MEANS (122) RESPONSIVE TO THE MONITORING MEANS (96, 99,123) IS UTILIZED FOR TERMINATING THE DEPOSITION (226, 228) OF THE CHARGED PHOSPHOR PARTICLES WHEN THE PREDETERMINED PROCESS PARAMETERS (222, 224) ARE SATISFIED.
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:
De conformidad con la presente invencion, un método para la fabricacion eletrofotográfica de un ensamble de pantalla luminiscente sobre una superficie interior de un panel de placa frontal (12) de un CRT de color (10) que comprende las etapas de recubrir la superficie interior del panel con un material conductor orgánico, volatilizable para formar una capa conductora orgánica (OC) (32) y, sobrecubrir la capa orgánica OC con un material fotoconductor volatilizable para formar una capa fotoconductora (OPC) orgánica (34). Después se establece un voltaje substancialmente uniforme sobre a capa OPC, y las áreas seleccionadas de la capa se exponen a la luz visible para afectar el voltaje sobre la misma, sin afectar el voltaje sobre el área no expuesta de la capa OPC. En seguida, se deposita el material de estructura de pantalla absorbedor de luz, triboeléctricamente cargado sobre el área no expuesta de la capa OPC para formar una matriz substancialmente continua (23) de material absorbedor de luz que tiene áreas abiertas en la misma. El presente método es una mejorar sobre los métodos anteriores en que el presente método incluye las etapas adicionales de formar una capa de planarizacion (35, 135) sobre la capa OPC; sobrecubrir la capa de planarizacion con un segundo recubrimiento del material conductor orgánico, volatilizable para formar una segunda capa OC (132) y después, sobrecubrir la segunda capa OC con un segundo recubrimiento del material fotoconductor orgánico, volatilizable para formar una segunda capa OPC (134). Los materiales de fosforo se depositan sobre una segunda capa OPC expuesta y adecuadamente cargada de manera que los fosforos se sobreponen completamente a las aberturas en la matriz y sobresalen por lo menos una porcion de la matriz adyacente a las aberturas.
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:
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:
An apparatus (200) for developing a latent image formed on a photoreceptor, which is deposited on an interior surface of a faceplate panel (12) of a CRT display device (10), is disclosed. The developing apparatus includes a developing chamber (202), having a support surface (204) for supporting the panel, a screen structure material reservoir (222) for storing, deagglomerating and feeding the screen structure material (226), and a triboelectric gun assembly (236) communicating with the reservoir. The gun assembly triboelectric charges and imparts a desired charge polarity to the screen structure material. The gun assembly further includes at least one material dispersing nozzle (238) spaced from the support surface, for distributing the charged material for deposition onto the latent image.