Abstract:
Se describe una composicion de pasta para la estampacion de la pantalla de una máscara de sombra para tubo de rayos catodicos, compuesta de 12-32% en peso de un vehículo, 34-87% en peso de un material reflector de electrones y 0.7-44% en peso de un fundente alcalino y un método de estampacion de la pantalla que utiliza la composicion de pasta. En el método de estampacion de la pantalla que utiliza la composicion de pasta, el material reflector de electrones y el material irradiante térmicamente se recubre sobre la superficie de la máscara de sombra del tubo de rayos catodicos para hacer disminuir el fenomeno de formacion de domo debido a la expansion térmica de la máscara de sombra, para suprimir mediante esto el deterioro de la calidad de la imagen provocado por el fenomeno de formacion de domos.
Abstract:
Un tubo de rayos catodicos que tiene una pistola de electrones, la cual incluye un lente de enfoque principal hecho de un material helicoidal de alta resistencia, y un proceso para producirlo. El método para formar un cuerpo helicoidal de alta resistencia sobre la superficie interna de un tubo de vidrio comprende los pasos de hacer (31) un orificio en la porcion central del tubo de vidrio, y unir un anillo sellador mediante fritacion, para realizar la conexion eléctrica con ambos extremos del tubo de vidrio; recubrir (35) el tubo de vidrio con una pasta de un material de alta resitencia obatenido mediante la mezcla de polvo de vidrio que tiene un punto de reblandecimiento más bajo que la temperatura de templado del tubo de vidrio, con oxido de rutenio; formar (37) el producto resultante a una temperatura de 420 degree C a 550 degree C, mediante la cual, se forma un cuerpo helicoidal de alta resistencia que tiene un valor de resistencia de 0.8 Gmega a 100 Gmega.
Abstract:
A method for manufacturing a mask for a color CRT. The mask comprises a plurality of mask members (1, 3) having a number of apertures for passing electron beems (33), and being spaced apart. The mask is produced by the steps of bringing the mask members (1, 3) into tight contact with an insulator (13) interposed between their peripheries; fixing them by an adhesive; press forming the entire composite; melting the adhesive; and shifting apart and fixing the mask members (1, 3) at a predetermined distance.
Abstract:
An article and a method of making a line of sight opening in an article wherein the line of sight opening in the article is partially defined by material on one surface of the article and partially defined by material on the opposite surface of the article and an application of the hole technology comprising a television tube (30) having an electron gun and an aperture mask with a plurality of line of sight openings in the aperture mask wherein the line of sight openings (47), in the aperture mask (48), are partially defined by material on the cone side surface of the aperture mask (48) and partially defined by material on the grade side surface of the aperture mask (48) with the aperture mask located in the television tube with the cone side of the aperture mask facing the electron guns.
Abstract:
A color cathode-ray tube (20) in which, opposing to a color fluorescent screen (5) so configured that stripes (9) of luminescent materials each capable of emitting light of a color are arranged in parallel to each other in a predetermined order, an aperture grille (10) in which a number of slits (4) extending in the longitudinal direction of the stripes (9) are made in parallel to each other is provided, the aperture grille (10) is so configured as to stretch a thin plate (1) having the slits (4) on a frame (3) with a required tension in the longitudinal direction of the slits (4). The thin plate (1) is a thin high purity iron plate having a thickness of 0.05 mm or less. Since the controllability of the widths of the slits in manufacturing is improved by virtue of the specified thickness of the thin plate, the precision and productivity of the aperture grille can be improved and the weight thereof can be reduced. Further, a fine structure screen for color cathode-ray tubes can be manufactured.
Abstract:
Method of fabricating an improved multiple grid electrode having a plurality of discs by simultaneously forming a dimpled segment in a sandwich structure consisting of metallic discs (42, 43, 44) separated by spacer material (46, 47). The dimpled sandwich structure is then machined, forming a series of vanes on the dimpled portion by an appropriate method, such as electrical discharge. After machining, the spacer material (46, 47) is etched away, leaving only the vaned discs, (42, 43, 44) forming grid electrodes.
Abstract:
The present invention relates to a method for pre-stressing a CRT tension mask (24) to induce creep. The method includes the steps of applying a suitable force to the mask material to induce stress therein; heating the mask material to an ultimate temperature, for a sufficient time, while under stress, to induce creep; and cooling the material.
Abstract:
A flat configuration image display apparatus (30) comprising a electron beam generator equipped with cold cathodes (14) for generating a plurality of electrom beams in response to image signals fed from an image signal supply circuit, electron beam control electrodes (15) for selectively energizing the cold cathodes of the electron beam generator in accordance with a scanning line selection signal. The electron beam generator is further equipped with at least an array of n base electrodes (13) extending in vertical directions of a screen of the image display apparatus where n is an integer equal to or greater than 3, and a predetermined number of the cold cathodes (14) are disposed on each of the base electrodes (13). The image signals are independently applied through terminal leaders to the base electrodes (13), the terminal leaders being led up to outsides of a vacuum housing of the image display apparatus (30). The electron control electrodes (15) are divided into a plurality of groups each of which are responsive to the scanning line selection signal through a common bus.
Abstract:
Spherically convex microgrids may be prepared from a flat microgrid structure by using a process depending on the differential thermal expansion between the material of the flat structure and a layer of other material applied thereto. A flat process blank 2 is etched with grid apertures in a microgrid area to which a curvature is to be added during fabrication. The blank is then subject to the deposition of a thin layer 4 of aluminium nitride (or other differential thermal expansion material having a positive thermal expansion mismatch with the material of the microgrid substrate) over at least the microgrid area (Step A). The differential thermal expansion layer is coextensively with the grid area, so as to confine the warping substantially to the grid area where curvature is desired. Curvature (Step B) is accomplished by a controlled heat warping step in an inert atmosphere (for a silicon microgrid structure of 250 micrometers thickness, heating at 1200C to soften the silicon). Permanent deformation, occuring as a result of the differential thermal expansion, is controlled by selection of temperature and time of heat treatment to achieve the desired curvature. The aluminium nitride layer (Step C) is removed prior to cooling.