EP0206880A1 - Process and device for illuminating a colour television tube plate to make a screen - Google Patents

Process and device for illuminating a colour television tube plate to make a screen Download PDF

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Publication number
EP0206880A1
EP0206880A1 EP86401187A EP86401187A EP0206880A1 EP 0206880 A1 EP0206880 A1 EP 0206880A1 EP 86401187 A EP86401187 A EP 86401187A EP 86401187 A EP86401187 A EP 86401187A EP 0206880 A1 EP0206880 A1 EP 0206880A1
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EP
European Patent Office
Prior art keywords
screen
light
brush
deflector
computer
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Granted
Application number
EP86401187A
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German (de)
French (fr)
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EP0206880B1 (en
Inventor
Pierluigi Testa
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Videocolor SA
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Videocolor SA
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Publication of EP0206880A1 publication Critical patent/EP0206880A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses

Definitions

  • the invention relates to a method and an apparatus for illuminating a photosensitive material arranged on a panel for forming the cathodo-luminescent screen of a color television tube of the perforated mask type.
  • a color television tube has a front panel on the internal surface of which the screen is deposited, which is usually formed by vertical bands of emitting cathodo-luminescent material, when they are excited by an electron beam produced by a cannon. electron, red, green or blue light.
  • the screen thus comprises a succession of sets of three vertical bands, each set having a red band, a green band and a blue band. Each color is excited by a corresponding electron beam.
  • a matrix two neighboring bands of phosphors are separated by a black band of graphite, which makes it possible to obtain an image of improved contrast.
  • a mask tube for the selection of colors, that is to say so that the beam intended for a color, for example blue, strikes only the phosphor of this color (blue), provision is made in front of the screen a shadow mask whose position and arrangement of the slots ensures said selection.
  • each of the luminescent substances is deposited in the following manner: the internal face of the panel is covered with a solution of this substance in a photosensitive material which hardens when it is illuminated by ultraviolet (UV) radiation, then it is illuminated through the mask this solution covering the internal face of the slab by an optical system which comprises a source of UV radiation and an objective simulating the deflector of the tube.
  • the position of the optical system, in particular of the UV lamp depends on the color of the phosphor in solution. In this way only the photosensitive material located at the locations provided for the determined color is illuminated and can therefore harden. The material in the other locations does not harden or settle on the glass; it can be cleaned by washing with water or using another liquid.
  • the UV source emitting a radiation whose intensity is not constant as a function of the direction of emission, between this source and the screen there is a filter which compensates for this lack of uniformity so that the intensity of the radiation reaching the screen is substantially constant on the surface thereof; indeed, if it were not so, the surface area of the hardened locations would not be constant.
  • the mask is formed of slots arranged in succession along vertical lines while it is desired to form on the screen continuous vertical lines. Without particular precautions, we would therefore obtain on the screen broken lines of phosphors and graphite. To avoid this defect, during illumination the lighting apparatus is moved in a vertical direction.
  • a special lighting device For the manufacture of each type and size of color television tube, a special lighting device must be provided. In other words, an appliance intended for a given type and dimension cannot be used for another dimension or another type. In addition, the exposure times are relatively long.
  • the invention overcomes these drawbacks.
  • the apparatus comprises: a light source emitting a light brush or fine light beam, preferably a laser, a deflector for deflecting the beam so that it scans the surface of the slab, a light modulator and a device programmable, such as a computer, to control, on the one hand, the light modulator so that the light intensity received by the screen is practically constant, and, on the other hand, the scanning to illuminate vertical bands on the screen through the mask holes.
  • the light modulator has a role analogous to the role played by the filter of the prior art illumination apparatus, that is to say that it is controlled in such a way that at each point of the screen the amount of light energy received per unit area is constant.
  • the light brush has a constant intensity whatever the direction whereas it is not the same with the known apparatus; but the compensation to be carried out results from the fact that the intersection section of the light brush by the screen is not the same from a point. another from this screen; this section is larger on the edges than in the center and, thus, the energy density received per unit area is lower on the edges than in the center.
  • the light modulator is controlled so that the intensity is lower in the center than at the edges.
  • the exposure time is of a low value, which reduces the manufacturing time.
  • the programmable device also controls the movement of the center of deflection.
  • This displacement when carried out parallel to the lines of the screen, makes it possible to pass from the illumination of a strip of determined color to a strip of another color.
  • a displacement of this center parallel to the vertical bands of the screen ensures the continuity of the bands of phosphors and possibly of the black bands.
  • a displacement of the center of deflection perpendicular to the screen makes it possible to adapt the lighting apparatus to the manufacture of other types or other dimensions of tubes.
  • FIG. 1 is a - diagram representing an apparatus according to the invention, as well as the date-screen and the mask of a color display tube, in particular a television receiver tube.
  • This device 12 is used to illuminate, in vertical bands 13 ,, 13 2 ... 13 n ..., the internal face of the slab 10 which is covered over its entire surface with a solution of a colored phosphor determined - or graphite - in a photosensitive material.
  • This illumination hardens the photosensitive material on these strips; in this way, the hardened material remains, with the phosphor or the graphite which it contains, on the glass while the uncured material, that is to say which has not been illuminated, can be removed by washing .
  • the illumination is carried out through the holes 14 of the mask 11 which are constituted by vertically elongated slots and arranged according to columns of vertical axis 15, ... 15n ...
  • the role of the shadow mask 11 is to obscure each of the electron beams so that the beam intended to excite the phosphors of one color does not excite the phosphors of another color. This is why this mask 11 has a position determined very precisely with respect to the screen 10, and, therefore, the screen is formed from the holes in the mask.
  • the illumination device 12 comprises, in the example, a light source constituted here by a laser 16 emitting ultra-violet radiation capable of hardening the photosensitive materials placed on the screen 10.
  • the beam 17 of coherent light coming out of the laser 16 may have an intensity which is not necessarily constant at all points in its section, provision is made for an assembly 18 making it possible to diaphragm this beam 17 to produce a beam 19 of more uniform intensity over its section .
  • the assembly 18 comprises a focusing lens 20, a diaphragm 21, the opening of which is at the focal point of the lens 20, and a lens 22, the object focus of which is at the location of the opening of the diaphragm 21.
  • the assembly 18 thus retains only the central part of the laser beam and it increases the section of this central part.
  • the beam 19 enters a light modulator 23 controlled by an electrical signal, applied to a corresponding input 24, which is provided by an interface 25 between the input. 24 of the modulator 23 and the output 26 of a computer 27.
  • the interface 25 includes a two-way switching circuit and, for each channel, a digital-analog converter and an amplifier of the converter output signals.
  • the interface 25 has a second output which delivers a signal to the input 28 for controlling a deflector 29 for the light brush 30 exiting from the light modulator 23.
  • the deflector 29 deflects the beam 30 by refraction and / or reflection so as to produce an output beam 31 which scans the entire surface of the screen 10.
  • the displacement is for example carried out column by column, that is to say that the beam 31 first moves in a first vertical plane, that of the strip 13 ,; then it is moved to scan column 13 2 , etc ...
  • the deflection center 32 of the deflector 29 is also movable in a horizontal direction perpendicular to the beam 30, in the direction of the arrows 35, parallel to the lines of the screen, to pass from the illumination of the locations of a color to the illumination locations of another color or black bands.
  • the deflection center 32 is movable perpendicular to the screen, that is to say in the direction (arrows 34) of the beams 17, 19 and 30, in particular to allow the adaptation of the device 12 to another type of tube to be manufactured.
  • the light modulator 23 is constituted by a Kerr effect cell or by a Pockels effect cell or by a Faraday effect cell.
  • a Kerr effect cell or by a Pockels effect cell or by a Faraday effect cell.
  • the deflector 29 is for example an acousto-optical deflector with Brillouin effect or a mechanical deflector or an electro-optical deflector, for example with Pockels effect. Details of these deflectors are also found in the work cited above.
  • deflector 29 it is possible to combine an electro-acoustic means, to carry out a sweeping with the stationary deflection center 32, with a means of the mechanical type which moves this deflector so as to displace the deflection center 32. It is also possible use a rotating mirror means secured to a support rotating along another axis as described in German patent application 3,035,367.
  • the computer 27 is programmed to deliver in succession on its output 26 appropriate control signals at each instant for the modulator 23 and for the deflector 29.
  • the output 26 of the computer delivers a signal applied to the input 24 of the modulator 23 which represents an amplitude of attenuation of the beam 19 and of the signals, transmitted on the input 28, which represent the position of the center of deflection 32, the position of the scanning plane in which the brush 31 and the angle formed by this brush 31 with a reference direction in this plane.
  • the light source is constituted by a laser, it should be noted that this can also be constituted by an incoherent light source.
  • an excitation of the laser 16 is provided, modulated by the computer 27.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

Appareil d'illumination de matière photosensible durcissable à la lumière pour la fabrication de l'écran (10) d'un tube à rayons cathodiques en couleurs du type à masque perforé (11).Cet appareil comprend un laser (16), un modulateur de lumière (23) et un déflecteur (29) pour dévier le pinceau modulé (30).Le modulateur de lumière (23) et le déviateur - (29) sont commandés par un calculateur (27) afin que l'intensité lumineuse reçue par chaque point de l'écran soit sensiblement constante.Apparatus for illuminating light-curable photosensitive material for manufacturing the screen (10) of a shadow mask type color cathode ray tube (11).The apparatus comprises a laser (16), a modulator of light (23) and a deflector (29) to deflect the modulated brush (30). The light modulator (23) and the deflector - (29) are controlled by a computer (27) so that the light intensity received by each point of the screen is substantially constant.

Description

L'invention est relative à un procédé et à un appareil d'illumination d'un matériau photosensible disposé sur une dalle pour la formation de l'écran cathodo-luminescent d'un tube de télévision en couleurs du type à masque perforé.The invention relates to a method and an apparatus for illuminating a photosensitive material arranged on a panel for forming the cathodo-luminescent screen of a color television tube of the perforated mask type.

Un tube de télévision en couleurs comporte une dalle frontale sur la surface interne de laquelle est déposé l'écran qui est formé habituellement de bandes verticales de matière cathodo-luminescente émettant, lorsqu'elles sont excitées par un faisceau d'électrons produit par un canon à électrons, une lumière de couleur rouge, verte ou bleue. L'écran comprend ainsi une succession d'ensembles de trois bandes verticales, chaque ensemble présentant une bande rouge, une bande verte et une bande bleue. Chaque couleur est excitée par un faisceau d'électrons correspondant. Dans un tube, souvent appelé "matrix", deux bandes de luminophores voisines sont séparées par une bande noire de graphite, ce qui permet d'obtenir une image de contraste amélioré. Dans un tube à masque, pour la sélection des couleurs, c'est-à-dire pour que le faisceau destiné à une couleur, par exemple le bleu, ne frappe que le luminophore de cette couleur (bleu), on prévoit devant l'écran un masque perforé dont la position et la disposition des fentes assure ladite sélection.A color television tube has a front panel on the internal surface of which the screen is deposited, which is usually formed by vertical bands of emitting cathodo-luminescent material, when they are excited by an electron beam produced by a cannon. electron, red, green or blue light. The screen thus comprises a succession of sets of three vertical bands, each set having a red band, a green band and a blue band. Each color is excited by a corresponding electron beam. In a tube, often called a "matrix", two neighboring bands of phosphors are separated by a black band of graphite, which makes it possible to obtain an image of improved contrast. In a mask tube, for the selection of colors, that is to say so that the beam intended for a color, for example blue, strikes only the phosphor of this color (blue), provision is made in front of the screen a shadow mask whose position and arrangement of the slots ensures said selection.

Etant donné que la position du masque par rapport à l'écran déposé sur la dalle doit être déterminée avec précision, le masque est fixé à la dalle du tube antérieurement à la formation de l'écran afin que ce masque puisse être utilisé pour réaliser l'écran. Chacune des substances luminescentes est déposée de la façon suivante : on recouvre la face interne de la dalle d'une solution de cette substance dans un matériau photosensible qui durcit lorsqu'il est illuminé par un rayonnement ultra-violet(UV), puis on illumine à travers le masque cette solution recouvrant la face interne de la dalle par un système optique qui comprend une source de rayonnement UV et un objectif simulant le déviateur du tube. La position du système optique, notamment de la lampe UV, dépend de la couleur du luminophore en solution. De cette manière seule la matière photosensible se trouvant aux emplacements prévus pour la couleur déterminée est illuminée et peut donc durcir. La matière se trouvant aux autres emplacements ne durcit pas et ne se fixe pas sur le verre; elle peut être nettoyée par un lavage à l'eau ou à l'aide d'un autre liquide.Since the position of the mask relative to the screen deposited on the slab must be determined with precision, the mask is fixed to the slab of the tube before the screen is formed so that this mask can be used to make the 'screen. Each of the luminescent substances is deposited in the following manner: the internal face of the panel is covered with a solution of this substance in a photosensitive material which hardens when it is illuminated by ultraviolet (UV) radiation, then it is illuminated through the mask this solution covering the internal face of the slab by an optical system which comprises a source of UV radiation and an objective simulating the deflector of the tube. The position of the optical system, in particular of the UV lamp, depends on the color of the phosphor in solution. In this way only the photosensitive material located at the locations provided for the determined color is illuminated and can therefore harden. The material in the other locations does not harden or settle on the glass; it can be cleaned by washing with water or using another liquid.

La source UV émettant un rayonnement dont l'intensité n'est pas constante en fonction de la direction d'émission, entre cette source et l'écran on dispose un filtre qui compense ce défaut d'uniformité afin que l'intensité du rayonnement atteignant l'écran soit sensiblement constante sur la surface-de ce dernier; en effet, s'il n'en était pas ainsi, la superficie des emplacement durcis ne serait pas constante.The UV source emitting a radiation whose intensity is not constant as a function of the direction of emission, between this source and the screen there is a filter which compensates for this lack of uniformity so that the intensity of the radiation reaching the screen is substantially constant on the surface thereof; indeed, if it were not so, the surface area of the hardened locations would not be constant.

Le masque est formé de fentes disposées en succession selon des lignes verticales alors qu'on désire former sur l'écran des lignes verticales continues. Sans précaution particulière on obtiendrait donc sur l'écran des lignes interrompues de luminophores et de graphite. Pour éviter ce défaut, au cours de l'illumination on déplace l'appareil d'illumination en direction verticale.The mask is formed of slots arranged in succession along vertical lines while it is desired to form on the screen continuous vertical lines. Without particular precautions, we would therefore obtain on the screen broken lines of phosphors and graphite. To avoid this defect, during illumination the lighting apparatus is moved in a vertical direction.

Pour la fabrication de chaque type et de chaque dimension de tube de télévision en couleurs, il faut prévoir un appareil d'illumination particulier. En d'autres termes un appareil prévu pour un type et une dimension déterminés n'est pas utilisable pour une autre dimension ou un autre type. En outre les temps d'exposition sont relativement longs.For the manufacture of each type and size of color television tube, a special lighting device must be provided. In other words, an appliance intended for a given type and dimension cannot be used for another dimension or another type. In addition, the exposure times are relatively long.

L'invention remédie à ces inconvénients.The invention overcomes these drawbacks.

L'appareil selon l'invention comporte : une source lumineuse émettant un pinceau lumineux ou faisceau lumineux fin, de préférence un laser, un déflecteur pour dévier le faisceau afin qu'il balaie la surface de la dalle, un modulateur de lumière et un dispositif programmable, tel qu'un calculateur, pour commander, d'une part, le modulateur de lumière afin que l'intensité lumineuse reçue par l'écran soit pratiquement constante, et, d'autre part, le balayage pour éclairer des bandes verticales sur l'écran à travers les trous du masque.The apparatus according to the invention comprises: a light source emitting a light brush or fine light beam, preferably a laser, a deflector for deflecting the beam so that it scans the surface of the slab, a light modulator and a device programmable, such as a computer, to control, on the one hand, the light modulator so that the light intensity received by the screen is practically constant, and, on the other hand, the scanning to illuminate vertical bands on the screen through the mask holes.

Le modulateur de lumière a un rôle analogue au rôle que joue le filtre de l'appareil d'illumination de la technique antérieure, c'est-à-dire qu'il est commandé de façon telle qu'en chaque point de l'écran la quantité d'énergie lumineuse reçue par unité de surface soit constante. Il est à noter toutefois qu'en principe le pinceau lumineux a une intensité constante quelle que soit la direction alors qu'il n'en est pas de même avec l'appareil connu; mais la compensation à effectuer résulte du fait que la section d'intersection du pinceau lumineux par l'écran n'est pas la même d'un point. un autre de cet écran; cette section est plus importante sur les bords qu'au centre et, ainsi, la densité d'énergie reçue par unité de surface est plus faible sur les bords qu'au centre. Autrement dit le modulateur de lumière est commandé de façon telle que l'intensité soit plus faible au centre que sur les bords.The light modulator has a role analogous to the role played by the filter of the prior art illumination apparatus, that is to say that it is controlled in such a way that at each point of the screen the amount of light energy received per unit area is constant. It should be noted however that in principle the light brush has a constant intensity whatever the direction whereas it is not the same with the known apparatus; but the compensation to be carried out results from the fact that the intersection section of the light brush by the screen is not the same from a point. another from this screen; this section is larger on the edges than in the center and, thus, the energy density received per unit area is lower on the edges than in the center. In other words, the light modulator is controlled so that the intensity is lower in the center than at the edges.

Lorsque la source lumineuse est constituée par un laser le temps d'exposition est d'une valeur faible, ce qui diminue la durée de fabrication.When the light source is constituted by a laser, the exposure time is of a low value, which reduces the manufacturing time.

Dans une réalisation le dispositif programmable commande également le déplacement du centre de déviation. Ce déplacement, lorsqu'il est effectué parallèlement aux lignes de l'écran, permet de passer de l'illumination d'une bande de couleur déterminée à une bande d'une autre couleur. Un déplacement de ce centre parallèlement aux bandes verticales de l'écran assure la continuité des bandes de luminophores et éventuellement des bandes noires. Enfin un déplacement du centre de déviation perpendiculairement à l'écran permet d'adapter l'appareil d'illumination à la fabrication d'autres types ou d'autres dimensions de tubes.In one embodiment, the programmable device also controls the movement of the center of deflection. This displacement, when carried out parallel to the lines of the screen, makes it possible to pass from the illumination of a strip of determined color to a strip of another color. A displacement of this center parallel to the vertical bands of the screen ensures the continuity of the bands of phosphors and possibly of the black bands. Finally, a displacement of the center of deflection perpendicular to the screen makes it possible to adapt the lighting apparatus to the manufacture of other types or other dimensions of tubes.

D'autres caractéristiques et avantages de l'invention-apparaitront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant à la figure unique qui est un - schéma représentant un appareil selon l'invention, ainsi que la datte-écran et le masque d'un tube de visualisation en couleurs, notamment un tube récepteur de télévision.Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the single figure which is a - diagram representing an apparatus according to the invention, as well as the date-screen and the mask of a color display tube, in particular a television receiver tube.

Sur cette figure la dalle-écran 10 et le masque 11 ont été représentés à une échelle plus importante que l'appareil 12 d'illumination.In this figure the screen slab 10 and the mask 11 have been shown on a larger scale than the illumination device 12.

Cet appareil 12 est utilisé pour illuminer, selon des bandes verticales 13,, 132...13n..., la face interne de la dalle 10 qui est recouverte sur toute sa superficie d'une solution d'un luminophore de couleur déterminée -ou de graphite -dans une matière photosensible. Cette illumination durcit la matière photosensible sur ces bandes; de cette manière, la matière durcie reste, avec le luminophore ou le graphite qu'elle contient, sur le verre alors que la matière non durcie, c'est-à-dire qui n'a pas été illuminée, peut être éliminée par lavage.This device 12 is used to illuminate, in vertical bands 13 ,, 13 2 ... 13 n ..., the internal face of the slab 10 which is covered over its entire surface with a solution of a colored phosphor determined - or graphite - in a photosensitive material. This illumination hardens the photosensitive material on these strips; in this way, the hardened material remains, with the phosphor or the graphite which it contains, on the glass while the uncured material, that is to say which has not been illuminated, can be removed by washing .

L'illumination s'effectue à travers les trous 14 du masque 11 qui sont constitués par des fentes allongées verticalement et disposées selon des colonnes d'axe vertical 15,... 15n... Lors du fonctionnement habituel du tube de visualisation en couleurs le rôle du masque perforé 11 est d'occulter chacun des faisceaux d'électrons afin que le faisceau destiné à exciter les luminophores d'une couleur n'excite pas les luminophores d'une autre couleur. C'est pourquoi ce masque 11 a une position déterminée de façon très précise par rapport à l'écran 10, et, de ce fait, l'écran est formé à partir des trous du masque.The illumination is carried out through the holes 14 of the mask 11 which are constituted by vertically elongated slots and arranged according to columns of vertical axis 15, ... 15n ... During the usual operation of the color display tube the role of the shadow mask 11 is to obscure each of the electron beams so that the beam intended to excite the phosphors of one color does not excite the phosphors of another color. This is why this mask 11 has a position determined very precisely with respect to the screen 10, and, therefore, the screen is formed from the holes in the mask.

L'appareil 12 d'illumination selon l'invention comprend, dans l'exemple, une source lumineuse constituée ici par un laser 16 émettant un rayonnement ultra-violet susceptible de durcir les matériaux photosensibles disposés sur l'écran 10. Le faisceau 17 de lumière cohérente qui sort du laser 16 pouvant présenter une intensité qui n'est pas forcément constante en tous les points de sa section, on prévoit un montage 18 permettant de diaphragmer ce faisceau 17 pour produire un faisceau 19 d'intensité plus uniforme sur sa section. A cet effet le montage 18 comprend une lentille 20 de focalisation, un diaphragme 21 dont l'ouverture se trouve au foyer de la lentille 20, et une lentille 22 dont le foyer objet se trouve à l'emplacement de l'ouverture du diaphragme 21. Le monage 18 ne retient ainsi que la partie centrale du faisceau laser et il augmente la section de cette partie centrale.The illumination device 12 according to the invention comprises, in the example, a light source constituted here by a laser 16 emitting ultra-violet radiation capable of hardening the photosensitive materials placed on the screen 10. The beam 17 of coherent light coming out of the laser 16 may have an intensity which is not necessarily constant at all points in its section, provision is made for an assembly 18 making it possible to diaphragm this beam 17 to produce a beam 19 of more uniform intensity over its section . To this end, the assembly 18 comprises a focusing lens 20, a diaphragm 21, the opening of which is at the focal point of the lens 20, and a lens 22, the object focus of which is at the location of the opening of the diaphragm 21. The assembly 18 thus retains only the central part of the laser beam and it increases the section of this central part.

Le faisceau 19 pénètre dans un modulateur de lumière 23 commandé par un signal électrique, appliqué sur une entrée correspondante 24, qui est fourni par un interface 25 entre l'entrée. 24 du modulateur 23 et la sortie 26 d'un calculateur 27. L'interface 25 comporte un circuit d'aiguillage à deux voies et, pour chaque voie, un convertisseur numérique-analogique et un amplificateur des signaux de sortie du convertisseur.The beam 19 enters a light modulator 23 controlled by an electrical signal, applied to a corresponding input 24, which is provided by an interface 25 between the input. 24 of the modulator 23 and the output 26 of a computer 27. The interface 25 includes a two-way switching circuit and, for each channel, a digital-analog converter and an amplifier of the converter output signals.

L'interface 25 comporte une seconde sortie qui délivre un signal à l'entrée 28 de commande d'un déflecteur 29 pour le pinceau lumineux 30 sortant du modulateur de lumière 23.The interface 25 has a second output which delivers a signal to the input 28 for controlling a deflector 29 for the light brush 30 exiting from the light modulator 23.

Le déflecteur 29 dévie le faisceau 30 par réfraction et/ou réflexion de manière à produire un faisceau de sortie 31 qui balaie toute la surface de l'écran 10. Le déplacement est par exemple effectué colonne par colonne, c'est-à-dire que le faisceau 31 se déplace d'abord dans un premier plan vertical, celui de la bande 13,; ensuite il est déplacé pour balayer la colonne 132, etc...The deflector 29 deflects the beam 30 by refraction and / or reflection so as to produce an output beam 31 which scans the entire surface of the screen 10. The displacement is for example carried out column by column, that is to say that the beam 31 first moves in a first vertical plane, that of the strip 13 ,; then it is moved to scan column 13 2 , etc ...

Si dans le déflecteur 29 le centre de déviation 32 restait immobile on obtiendrait sur chaque colonne 13 de la dalle 10 des segments non illuminés correspondant aux intervalles 33 entre fentes 14 du masque 11. C'est pourquoi le centre de déviation 32 est déplacé verticalement, parallèlement à ces colonnes, vers le haut ou vers le bas dans une mesure suffisante pour atteindre les parties des colonnes 13 qui n'ont pas été éclairées lors du premier balayage. Ce déplacement vertical du centre de déviation 32 est effectué colonne par colonne, c'est-à-dire qu'après chaque balayage d'une colonne on déplace (flèches 36) le centre 32 et on effectue un nouveau balayage de cette colonne avec cette nouvelle position du centre 32. En variante on balaie toutes les colonnes de l'écran 10 avec le centre 32 immobile, puis on déplace le centre 32 pour effectuer un nouveau balayage de l'ensemble des colonnes de façon à atteindre les segments de ces colonnes non illuminés lors du premier balayage.If in the deflector 29 the center of deflection 32 remained stationary, we would obtain on each column 13 of the slab 10 non-illuminated segments corresponding to the intervals 33 between slots 14 of the mask 11. This is why the center of deflection 32 is moved vertically, parallel to these columns, up or down to a sufficient extent to reach the parts of the columns 13 which were not lit during the first scan. This vertical displacement of the center of deflection 32 is carried out column by column, that is to say that after each scan of a column the center 32 is moved (arrows 36) and a new scan of this column is carried out with this new position of the center 32. As a variant, we sweep all the columns of the screen 10 with the center 32 stationary, then move the center 32 to carry out a new scan of all the columns so as to reach the segments of these columns which are not illuminated during the first scan.

Le centre de déviation 32 du déflecteur 29 est également déplaçable en direction horizontale perpendiculairement au faisceau 30, selon la direction des flèches 35, parallèle aux lignes de l'écran, pour passer de l'illumination des emplacements d'une couleur à l'illumination des emplacements d'une autre couleur ou des bandes noires.The deflection center 32 of the deflector 29 is also movable in a horizontal direction perpendicular to the beam 30, in the direction of the arrows 35, parallel to the lines of the screen, to pass from the illumination of the locations of a color to the illumination locations of another color or black bands.

Enfin le centre de déviation 32 est déplaçable perpendiculairement à l'écran, c'est-à-dire dans la direction (flèches 34) des faisceaux 17, 19 et 30, notamment pour permettre l'adaptation de l'appareil 12 à un autre type de tube à fabriquer.Finally, the deflection center 32 is movable perpendicular to the screen, that is to say in the direction (arrows 34) of the beams 17, 19 and 30, in particular to allow the adaptation of the device 12 to another type of tube to be manufactured.

Le modulateur de lumière 23 est constitué par une cellule à effet Kerr ou par une cellule à effet Pockels ou encore par une cellule à effet Faraday. Pour plus de précisions sur ce type de modulateur électro-optique ou magnéto-optique on pourra se reporter par exemple à l'ouvrage intitulé "Optoélectronique" de G. Broussaud, Masson et Cie. 1974.The light modulator 23 is constituted by a Kerr effect cell or by a Pockels effect cell or by a Faraday effect cell. For more details on this type of electro-optical or magneto-optical modulator, reference may be made, for example, to the work entitled "Optoelectronics" by G. Broussaud, Masson et Cie. 1974.

Le déflecteur 29 est par exemple un déflecteur acousto-optique à effet Brillouin ou un déflecteur mécanique ou un déflecteur électro-optique, par exemple à effet Pockels. Des précisions sur ces déflecteurs se trouvent également dans l'ouvrage précédemment cité.The deflector 29 is for example an acousto-optical deflector with Brillouin effect or a mechanical deflector or an electro-optical deflector, for example with Pockels effect. Details of these deflectors are also found in the work cited above.

Pour le déflecteur 29 on peut combiner un moyen électro-acoustique, pour effectuer un balayage avec le centre de déviation 32 immobile, avec un moyen du type mécanique qui déplace ce déflecteur de façon à déplacer le centre de déviation 32. Il est également possible d'utiliser un moyen à miroir tournant solidaire d'un support tournant selon un autre axe comme décrit dans la demande de brevet allemand 3 035 367.For the deflector 29 it is possible to combine an electro-acoustic means, to carry out a sweeping with the stationary deflection center 32, with a means of the mechanical type which moves this deflector so as to displace the deflection center 32. It is also possible use a rotating mirror means secured to a support rotating along another axis as described in German patent application 3,035,367.

Le calculateur 27 est programmé pour délivrer en succession sur sa sortie 26 des signaux de commande appropriés à chaque instant pour le modulateur 23 et pour le déflecteur 29. Ainsi à chaque instant la sortie 26 du calculateur délivre un signal appliqué sur l'entrée 24 du modulateur 23 qui représente une amplitude d'atténuation du faisceau 19 et des signaux, transmis sur l'entrée 28, qui représentent la position du centre de déviation 32, la position du plan de balayage dans lequel doit se trouver le pinceau 31 et l'angle que forme ce pinceau 31 avec une direction de référence dans ce plan.The computer 27 is programmed to deliver in succession on its output 26 appropriate control signals at each instant for the modulator 23 and for the deflector 29. Thus at each instant the output 26 of the computer delivers a signal applied to the input 24 of the modulator 23 which represents an amplitude of attenuation of the beam 19 and of the signals, transmitted on the input 28, which represent the position of the center of deflection 32, the position of the scanning plane in which the brush 31 and the angle formed by this brush 31 with a reference direction in this plane.

Pour utiliser l'appareil 12 en vue de la fabrication d'un autre type de tube, notamment d'une autre dimension, il suffit de modifier la programmation du calculateur 27. Une telle programmation et sa modification constituent des opérations courantes pour l'homme de métier.To use the device 12 for the manufacture of another type of tube, in particular another size, it suffices to modify the programming of the computer 27. Such programming and its modification constitute common operations for humans. business.

Bien qu'il soit préférable que la source lumineuse soit constituée par un laser on notera que celle-ci peut également être constituée par une source de lumière incohérente.Although it is preferable that the light source is constituted by a laser, it should be noted that this can also be constituted by an incoherent light source.

En variante encore, à la place du modulateur 23 on prévoit une excitation du laser 16 modulée par le calculateur 27.In another variant, instead of the modulator 23, an excitation of the laser 16 is provided, modulated by the computer 27.

Claims (15)

1. Appareil d'illumination de matière photosensible durcissable à la lumière pour la fabrication de l'écran (10) d'un tube à rayons cathodiques en couleurs du type à masque perforé (11), cet appareil comprenant une source lumineuse (16, 18) émettant un pinceau lumineux (19) et un déflecteur (29) pour dévier ce pinceau afin qu'il balaie l'écran (10) devant lequel est disposé le masque perforé - (11), caractérisé en ce qu'il comprend un modulateur de lumière (23) commandé par un calculateur (27) pour que l'intensité lumineuse reçue par chaque point de l'écran soit sensiblement constante.1. Apparatus for illuminating light-curable photosensitive material for manufacturing the screen (10) of a color cathode ray tube of the perforated mask type (11), this apparatus comprising a light source (16, 18) emitting a light brush (19) and a deflector (29) to deflect this brush so that it scans the screen (10) in front of which the shadow mask is placed - (11), characterized in that it comprises a light modulator (23) controlled by a computer (27) so that the light intensity received by each point of the screen is substantially constant. 2. Appareil selon la revendication 1, caractérisé en ce que le modulateur de lumière (23) est disposé entre la source lumineuse et le déflecteur - (29).2. Apparatus according to claim 1, characterized in that the light modulator (23) is arranged between the light source and the deflector - (29). 3. Appareil selon la revendication 1 ou 2, caractérisé en ce que le modulateur de lumière (23) est du type électro-optique ou magnéto-optique.3. Apparatus according to claim 1 or 2, characterized in that the light modulator (23) is of the electro-optical or magneto-optical type. 4. Appareil selon l'une des revendications 1 à 3, caractérisé en ce que le calculateur (27) commande également le déflecteur (29).4. Apparatus according to one of claims 1 to 3, characterized in that the computer (27) also controls the deflector (29). 5. Appareil selon la revendication 4, caractérisé en ce que le centre de déviation (32) dans le déflecteur (29) est déplaçable, sous la commande du calculateur (27), parallèlement (35) aux lignes de l'écran pour passer de l'illumination des emplacements de luminophore d'une couleur à l'illumination des emplacements de luminophore d'une autre couleur ou de bandes noires entre luminophores.5. Apparatus according to claim 4, characterized in that the deflection center (32) in the deflector (29) is movable, under the control of the computer (27), parallel (35) to the lines of the screen to pass from the illumination of the phosphor locations of one color to the illumination of the phosphor locations of another color or of black bands between phosphors. 6. Appareil selon la revendication 4 ou 5, caractérisé en ce que le centre de déviation (32) est déplaçable verticalement, dans une direction (36) parallèle aux colonnes (13) de luminophores sur l'écran (10), pour permettre l'illumination de chaque point d'une telle colonne (13) malgré les intervalles (33) entre fentes adjacentes (14) du masque.6. Apparatus according to claim 4 or 5, characterized in that the deflection center (32) is movable vertically, in a direction (36) parallel to the columns (13) of phosphors on the screen (10), to allow the illumination of each point of such a column (13) despite the intervals (33) between adjacent slots (14) of the mask. 7. Appareil selon la revendication 6, caractérisé en ce que la commande, par le calculateur (27), est telle que le centre de déviation 32) reste immobile lorsque le pinceau (31) balaie une colonne (13) sur toute la hauteur de l'écran, puis ce centre de déviation (32) est déplacé selon ladite direction verticale parallèle à une colonne pour que les points de cette colonne qui ont été occultés par les intervalles (33) entre fentes du masque soient illuminés lors de ce second balayage de la même colonne.7. Apparatus according to claim 6, characterized in that the control, by the computer (27), is such that the center of deflection 32) remains stationary when the brush (31) sweeps a column (13) over the entire height of the screen, then this center of deflection (32) is moved in said vertical direction parallel to a column so that the points of this column which have been obscured by the intervals (33) between slots of the mask are illuminated during this second scan of the same column. 8. Appareil selon la revendication 6, caractérisé en ce que le calculateur (27) commande le déplacement du centre de déviation (32) de façon telle que ce dernier reste immobile lors du balayage des diverses colonnes (13) de l'écran (10) et, ensuite, se déplace pour effectuer un second balayage de l'ensemble des colonnes, le déplacement étant tel que les emplacements des colonnes qui, lors du premier balayage, ont été occultés par les intervalles (33) entre fentes adjacentes du masque soient illuminés lors de ce second balayage.8. Apparatus according to claim 6, characterized in that the computer (27) controls the movement of the center of deflection (32) so that the latter remains stationary during the scanning of the various columns (13) of the screen (10 ) and then moves to perform a second scan of all of the columns, the displacement being such that the locations of the columns which, during the first scan, were obscured by the intervals (33) between adjacent slots of the mask are illuminated during this second scan. 9. Appareil selon la revendication 4, caractérisé en ce que le centre de déviation (32) du déflecteur (29) est déplaçable, sous la commande du calculateur (27), selon la direction (34) perpendiculaire à l'écran pour permettre l'utilisation de cet appareil pour la fabrication de l'écran de divers types de tubes.9. Apparatus according to claim 4, characterized in that the deflection center (32) of the deflector (29) is movable, under the control of the computer (27), in the direction (34) perpendicular to the screen to allow the use of this device for the manufacture of the screen of various types of tubes. 10. Appareil selon l'une quelconque des revendications perécédentes, caractérisé en ce que le déflecteur (29) est du type électro-acoustique.10. Apparatus according to any one of the preceding claims, characterized in that the deflector (29) is of the electro-acoustic type. 11. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que la source lumineuse comporte un laser (16) émettant un rayonnement ultraviolet.11. Apparatus according to any one of the preceding claims, characterized in that the light source comprises a laser (16) emitting ultraviolet radiation. 12. Appareil selon la revendication 11, caractérisé en ce qu'il comporte un dispositif (18) à diaphragme tel que seul le pinceau central du faisceau laser soit dévié par le déflecteur (29).12. Apparatus according to claim 11, characterized in that it comprises a device (18) with a diaphragm such that only the central brush of the laser beam is deflected by the deflector (29). 13. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce que la commande du modulateur de lumière (23) par le calculateur (27) est telle qu'elle compense la variation de la section d'intersection du pinceau lumineux par l'écran d'un point à un autre de cet écran.13. Apparatus according to any one of the preceding claims, characterized in that the control of the light modulator (23) by the computer (27) is such that it compensates for the variation in the intersection section of the light brush by l screen from point to point on this screen. 14. Procédé d'illumination d'une matière photosensible durcissable à la lumière pour la fabrication de l'écran (10) d'un tube à rayons cathodiques en couleur du type à masque perforé (11) dans lequel un pinceau lumineux (19) est dévié afin de balayer l'écran devant lequel est disposé le masque perforé, caractérisé en ce qu'on module l'intensité du pinceau lumineux afin que l'intensité lumineuse reçue par chaque point de l'écran soit sensiblement constante.14. A method of illuminating a light-curable photosensitive material for the manufacture of the screen (10) of a color cathode ray tube of the perforated mask type (11) in which a light brush (19) is deflected in order to scan the screen in front of which the shadow mask is placed, characterized in that the intensity of the light brush is modulated so that the light intensity received by each point of the screen is substantially constant. 15. Procédé selon la revendication 14, caractérisé en ce que le pinceau lumineux ayant, en l'absence de modulation, une intensité constante quelle que soit la direction, la modulation de l'intensité de ce pinceau assure le compensation de la variation de la section d'intersection de ce pinceau par l'écran d'un point à un autre de cet écran.15. The method of claim 14, characterized in that the light brush having, in the absence of modulation, a constant intensity regardless of the direction, the modulation of the intensity of this brush provides compensation for the variation of the section of intersection of this brush by the screen from one point to another of this screen.
EP86401187A 1985-06-04 1986-06-03 Process and device for illuminating a colour television tube plate to make a screen Expired EP0206880B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508396 1985-06-04
FR8508396A FR2582858B1 (en) 1985-06-04 1985-06-04 METHOD AND APPARATUS FOR ILLUMINATING THE SLAB OF A COLORED TELEVISION TUBE FOR SCREEN FORMATION

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EP0206880A1 true EP0206880A1 (en) 1986-12-30
EP0206880B1 EP0206880B1 (en) 1989-03-22

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EP (1) EP0206880B1 (en)
JP (1) JP2596897B2 (en)
CA (1) CA1248578A (en)
DE (1) DE3662575D1 (en)
FR (1) FR2582858B1 (en)
HK (1) HK102590A (en)
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EP0400578A2 (en) * 1989-05-31 1990-12-05 E.I. Du Pont De Nemours And Company Method and apparatus for maintaining desired exposure levels

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JPS622428A (en) 1987-01-08
FR2582858B1 (en) 1988-11-10
IN166455B (en) 1990-05-12
JP2596897B2 (en) 1997-04-02
DE3662575D1 (en) 1989-04-27
EP0206880B1 (en) 1989-03-22
HK102590A (en) 1990-12-14
CA1248578A (en) 1989-01-10
US4707093A (en) 1987-11-17
FR2582858A1 (en) 1986-12-05
SG77790G (en) 1991-01-18

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