EP0195993A2 - Method for the production of a colour picture tube provided with an internal conductive layer - Google Patents

Method for the production of a colour picture tube provided with an internal conductive layer Download PDF

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Publication number
EP0195993A2
EP0195993A2 EP86103550A EP86103550A EP0195993A2 EP 0195993 A2 EP0195993 A2 EP 0195993A2 EP 86103550 A EP86103550 A EP 86103550A EP 86103550 A EP86103550 A EP 86103550A EP 0195993 A2 EP0195993 A2 EP 0195993A2
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EP
European Patent Office
Prior art keywords
layer
neck
cone
picture tube
color picture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86103550A
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German (de)
French (fr)
Other versions
EP0195993A3 (en
EP0195993B1 (en
Inventor
Norbert Dr. Thiel
Volker Gerstle
Rolf Dr. Zondler
Otto Lederle
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Nokia Deutschland GmbH
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
Standard Elektrik Lorenz AG
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Publication of EP0195993A2 publication Critical patent/EP0195993A2/en
Publication of EP0195993A3 publication Critical patent/EP0195993A3/en
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Publication of EP0195993B1 publication Critical patent/EP0195993B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/88—Coatings
    • H01J2229/882—Coatings having particular electrical resistive or conductive properties

Definitions

  • the invention relates to a color picture tube according to the preamble of claim 1 and to a method for producing the color picture tube.
  • Such a color picture tube is known from DE-OS 27 42 751, in which the conductive layer on the inner surface of the cone consists of graphite, iron oxide and a silicate binder.
  • the entire inner surface of the neck of the color picture tube is coated with a film of evaporable material, for example consists of polyvinyl alcohol. This film serves to protect the neck when inserting the electron beam system. After attaching the electron beam system, any film in the throat is evaporated.
  • the conductive layer In order to avoid flashovers between the conductive layer in the cone, which is at a high electrical potential, and the electron gun system, the conductive layer must have a sharply delimited dividing line from the areas that remain free.
  • the layer thickness must be very even and very smooth in the area between the covered and uncovered areas, since otherwise material of the layer will easily crumble off at bead-like transitions, especially if the centering springs and contact springs of the electron gun system are pushed over this limit.
  • the invention has for its object to provide a color picture tube with a conductive layer on the inner surface of the cone, which has a sharp and scratch-resistant dividing line to the neck of the color picture tube
  • Another object is to provide a simple method of making such color picture tubes.
  • the cone 1 is shown with the melted neck 2 of a color picture tube 13, which also has a tub-mask combination 14 (slightly raised and shown in dashed lines) and a base 15. to which the tub-mask combination 14 is melted later.
  • the first conductive layer on the inner surface of the cone 1 is drawn with surface punctuation and is provided with the reference symbol 4.
  • This layer 4 extends to the melting line 5 between the neck 2 and the cone 1.
  • a second layer 6 which is hatched.
  • the boundary between this second layer 6 and the uncoated area in the neck 2 is provided with the reference number 7.
  • the second layer 6 can extend beyond the melting line 5 and cover the first layer 4 in this area.
  • Layer 4 contains no organic constituents and consists, for example, of a graphite suspension, into which iron powder or other non-conductive inorganic constituents for adjusting the electrical resistance, such as TiO 2 , Al 2 O 3 SiO 2 , are mixed and which has been provided with a silicate binder.
  • Layer 6 consists of the suspension of layer 4, to which organic constituents have also been added.
  • the organic constituents are, for example, polyvinylpyrrolidone, PVA, casein, polyvinyl acetate.
  • the method for producing the color picture tube according to FIG. 1 is described below with reference to FIGS. 2 to 5.
  • the well cleaned cone 1 with the neck 2 is provided with the first conductive layer by one of the known methods.
  • the first layer 4 is made by casting with the aid of a pipe end 9 guided along the boundary 8.
  • the entire inner surface of the cone 1 and the entire inner surface of the neck 2 are covered with this layer (drawn with a surface dot).
  • the anode contact in the cone 1 is blown free (not shown) and then the first conductive layer 4 is dried.
  • the drying is carried out according to FIG. 3 with infrared radiator 10, only one of which is shown.
  • the distance h between the lower edge of the infrared radiator 10 and the fritting surface 3 is chosen so that the layer 4 dries between the boundary 8 and the melting line 5 and remains wet between the melting line 5 and the free neck end.
  • the wet layer 4 below the melting line 5 in the neck 2 can, at a predetermined distance h, also by a appropriate setting of the heating power of the infrared radiator can be effected.
  • the layer 4 that remains wet below the melting line 5 is then removed by rinsing the neck 2 with the suspension of the later second layer.
  • a tube 11 is inserted into the neck 2 from below, at the upper end of which the suspension 6a (hatched) the later second layer emerges. The free end of the tube 11 projects somewhat beyond the melting line 5.
  • the dried layer 4 is also somewhat washed over in the transition area from the cone 1 to the neck 2, but not washed off. Only the first layer which remains wet below the melting line 5 is removed and replaced by the suspension of the second layer. After removal of the tube 11, this layer is dried in the neck 2.
  • the neck can, for example, be exposed to the air flow from a heating fan (not shown).
  • the area to be left free from the second layer 6 in the neck 2 becomes on 5 for example by rinsing with alkali metal hydroxides, in particular with a 5-10% sodium hydroxide solution and subsequent cleaning with a wiper 12 and water.
  • a 0.5-2% sodium hydroxide solution is preferably used for rinsing. This can be followed by a neck cleanse with hydrofluoric acid. Finally, the neck 2 is rinsed inside and outside with demineralized water.
  • a ring brush (not shown) can be used for external cleaning.

Abstract

Bei einer Farbbildröhre (13) besteht die leitende Schicht (4) auf der Innenfläche des Konus (1) aus einer Suspension ohne organische Bestandteile. Die leitende Schicht (6) auf der Innenfläche des Halses (2), die an die erstgenannte Schicht (4) unmittelbar anschließt, besteht aus der genannten Suspension mit einem Zusatz aus organischen Bestandteilen. Hierdurch läßt sich eine scharfe und kratzfeste Trennlinie zum Hals der Röhre erreichen.In the case of a color picture tube (13), the conductive layer (4) on the inner surface of the cone (1) consists of a suspension without organic components. The conductive layer (6) on the inner surface of the neck (2), which immediately adjoins the first-mentioned layer (4), consists of the suspension mentioned with an addition of organic constituents. This makes it possible to achieve a sharp and scratch-resistant dividing line to the neck of the tube.

Description

Die Erfindung bezieht sich auf eine Farbbildröhre gemäß dem Oberbegriff des Anspruchs 1 und auf ein Verfahren zur Herstellung der Farbbildröhre. The invention relates to a color picture tube according to the preamble of claim 1 and to a method for producing the color picture tube.

Aus der DE-OS 27 42 751 ist eine derartige Farbbildröhre bekannt, bei der die leitende Schicht auf der Innenfläche des Konus aus Graphit, Eisenoxyd und einem Silikatbindemittel besteht Die gesamte Innenfläche des Halses der Farbbildröhre wird mit einem Film aus verdampfbarem Material beschichtet, das beispielsweise aus Polyvinylalkohol besteht. Dieser Film dient zum Schutz des Halses beim Einschieben des Elektronenstrahlsystems. Nach dem Befestigen des Elektronenstrahlsystems wird jeglicher im Hals befindlicher Film verdampft.Such a color picture tube is known from DE-OS 27 42 751, in which the conductive layer on the inner surface of the cone consists of graphite, iron oxide and a silicate binder. The entire inner surface of the neck of the color picture tube is coated with a film of evaporable material, for example consists of polyvinyl alcohol. This film serves to protect the neck when inserting the electron beam system. After attaching the electron beam system, any film in the throat is evaporated.

Um Überschläge zwischen der auf hohem elektrischen Potential liegenden leitenden Schicht im Konus und dem Elektronenstrahlerzeugersystem zu vermeiden, muß die leitende Schicht eine scharf begrenzte Trennlinie zu den freibleibenden Bereichen aufweisen. Die Schichtdicke muß sehr gleichmäßig und im Bereich zwischen den bedeckten und unbedeckten Gebieten sehr glatt sein, da sonst an wulstartigen Übergängen leicht Material der Schicht abbröckelt, insbesondere, wenn die Zentrierfedem und Kontaktfedem des Elektronenstrahlerzeugersystems über diese Grenze geschoben werden.In order to avoid flashovers between the conductive layer in the cone, which is at a high electrical potential, and the electron gun system, the conductive layer must have a sharply delimited dividing line from the areas that remain free. The layer thickness must be very even and very smooth in the area between the covered and uncovered areas, since otherwise material of the layer will easily crumble off at bead-like transitions, especially if the centering springs and contact springs of the electron gun system are pushed over this limit.

Aus der DE-OS 29 03 735 ist ein Verfahren zum Aufbringen der leitenden Schicht auf den Konus einer Farbbildröhre bekannt Hierbei werden zuerst die freizubleibenden Gebiete mit einem Lackfilm abgedeckt, dann die leitende Schicht aufgebracht und abschließend der Lackfilm abgewaschen.From DE-OS 29 03 735 a method for applying the conductive layer on the cone of a color picture tube is known. Here, the areas to be left are first covered with a lacquer film, then the conductive layer is applied and finally the lacquer film is washed off.

Der Erfindung liegt die Aufgabe zugrunde, eine Farbbildröhre mit einer leitenden Schicht auf der Innenfläche des Konus anzugeben, die eine scharfe und kratzfeste Trennlinie zum Hals der Farbbildröhre aufweistThe invention has for its object to provide a color picture tube with a conductive layer on the inner surface of the cone, which has a sharp and scratch-resistant dividing line to the neck of the color picture tube

Eine weitere Aufgabe besteht darin, ein einfaches Verfahren zum Herstellen derartiger Farbbildröhren anzugeben.Another object is to provide a simple method of making such color picture tubes.

Die Lösung der erstgenannten Aufgabe folgt mit den im Anspruch 1 angegebenen Mitteln. Vorteilhafte Ausgestaltungen der Erfindungen sind in den Unteransprüchen 2 bis 4 enthalten.The solution to the first-mentioned object follows with the means specified in claim 1. Advantageous embodiments of the inventions are contained in subclaims 2 to 4.

Die Lösung der zweitgenannten Aufgabe erfolgt mit den im Anspruch 5 angegebenen Mitteln. Vorteilhafte Ausgestaltungen des Verfahrens sind in den Unteransprüchen 6 und 7 enthalten.The second object is achieved with the means specified in claim 5. Advantageous refinements of the method are contained in subclaims 6 and 7.

Die Erfindung wird nun anhand eines in den Figuren gezeigten Ausführungsbeispieles näher erläutert Es zeigen:

  • Fig. 1 eine Farbbildröhre in perspektivischer Darstellung mit teilweise aufgebrochenem Konus und Hals und
  • Fig. 2 verschiedene Schritte des Verfahrens zum

bis 5 Herstellen der Farbbildröhre.The invention will now be explained in more detail using an exemplary embodiment shown in the figures, in which:
  • Fig. 1 is a color picture tube in perspective with a partially broken cone and neck and
  • Fig. 2 different steps of the method for

to 5 manufacture the color picture tube.

In Fig. 1 ist der Konus 1 mit dem angeschmolzenen Hals 2 einer Farbbildröhre 13 dargestellt, die weiterhin eine Wannen-Maskenkombination 14 (etwas abgehoben und gestrichelt gezeichnet) und einen Sockel 15 aufweist Am oberen Rand des Konus 1 ist die Frittfläche mit 3 bezeichnet, an die später die Wannen-Maskenkombination 14 angeschmolzen wird. Die erste leitende Schicht auf der Innenfläche des Konus 1 ist flächenpunktiert gezeichnet und mit dem Bezugszeichen 4 versehen. Diese Schicht 4 reicht bis zur Anschmelzlinie 5 zwischen dem Hals 2 und dem Konus 1. Daran anschließend ist auf der Innenfläche des Halses 2 ein Bereich mit einer zweiten Schicht 6 vorhanden, die schraffiert gezeichnet ist Die Grenze zwischen dieser zweiten Schicht 6 und dem unbeschichteten Gebiet im Hals 2 ist mit dem Bezugszeichen 7 versehen. Die zweite Schicht 6 kann, wie in Fig. 1 dargestellt über die Anschmelzlinie 5 hinausreichen und in diesem Bereich die erste Schicht 4 überdecken.In Fig. 1, the cone 1 is shown with the melted neck 2 of a color picture tube 13, which also has a tub-mask combination 14 (slightly raised and shown in dashed lines) and a base 15. to which the tub-mask combination 14 is melted later. The first conductive layer on the inner surface of the cone 1 is drawn with surface punctuation and is provided with the reference symbol 4. This layer 4 extends to the melting line 5 between the neck 2 and the cone 1. Subsequently, on the inner surface of the neck 2 there is an area with a second layer 6, which is hatched. The boundary between this second layer 6 and the uncoated area in the neck 2 is provided with the reference number 7. As shown in FIG. 1, the second layer 6 can extend beyond the melting line 5 and cover the first layer 4 in this area.

Die Schicht 4 enthält keine organischen Bestandteile und besteht beispielsweise aus einer Graphitsuspension, in die Eisenpulver oder andere nichtleitende anorganische Bestandteile zur Einstellung des elektrischen Widerstandes, wie z.B. TiO2, Al2O3 SiO2, gemischt und die mit einem Silikatbindemittel versehen wurde. Die Schicht 6 besteht aus der Suspension der Schicht 4, der noch organische Bestandteile zugemischt wurden. Die organischen Bestandteile sind beispielsweise Polyvinylpyrrolidon, PVA, Casein, Polyvinylacetat Durch den Einsatz einer Suspension ohne organische Bestandteile für die erste Schicht 4 kann man kurze Frittzeiten beim Anglasen der Wannen-Maskenkombination 14 an den Konus 2 und kürzere Pumpzeiten mit niedrigerer Spitzentemperatur erreichen, ohne eine nachteilige Beeinflussung des Röhrenvakuums und der Lebensdauer der Röhre. Um den Nachteil einer unscharfen und nicht abriebfesten Trennlinie dieser Suspension zu einem nicht beschichteten Bereich zu umgehen, ist an die erste Schicht 4 die zweite Schicht 6 angesetzt, die aus einer eine scharfe Trennlinie ergebenden Suspension bestehtLayer 4 contains no organic constituents and consists, for example, of a graphite suspension, into which iron powder or other non-conductive inorganic constituents for adjusting the electrical resistance, such as TiO 2 , Al 2 O 3 SiO 2 , are mixed and which has been provided with a silicate binder. Layer 6 consists of the suspension of layer 4, to which organic constituents have also been added. The organic constituents are, for example, polyvinylpyrrolidone, PVA, casein, polyvinyl acetate. By using a suspension without organic constituents for the first layer 4, short fritting times when glazing the tub / mask combination 14 to the cone 2 and shorter pumping times with a lower peak temperature can be achieved without one adverse influence on the tube vacuum and the life of the tube. In order to avoid the disadvantage of a blurred and non-abrasion-resistant dividing line of this suspension from an uncoated area, the second layer 6 is applied to the first layer 4, which consists of a suspension that results in a sharp dividing line

Anhand der Figuren 2 bis 5 wird nachstehend das Verfahren zum Herstellen der Farbbildröhre gemäß Fig. 1 beschrieben. Der gut gereinigte Konus 1 mit dem Hals 2 wird mit der ersten leitenden Schicht durch eines der bekannten Verfahren versehen. Im in Fig. 2 dargestellten Beispiel wird die erste Schicht 4 durch Gießen mit Hilfe eines an der Begrenzung 8 entlang geführten Rohrendes 9 vorgenommen. Hierdurch wird die gesamte Innenfläche des Konus 1 und die gesamte Innenfläche des Halses 2 mit dieser Schicht bedeckt (flächenpunkfiert gezeichnet). Dann wird der Anodenkontakt im Konus 1 freigeblasen (nicht dargestellt) und danach die erste leitende Schicht 4 getrocknet Das Trocknen geschieht gemäß Fig. 3 mit infrarotstrahlem 10, von denen nur einer dargestellt ist Der Abstand h zwischen der Unterkante des Infrarotstrahlers 10 und der Frittfläche 3 wird dabei so gewählt, daß die Schicht 4 zwischen der Begrenzung 8 und der Anschmelzlinie 5 trocknet und zwischen der Anschmelzlinie 5 und dem freien Halsende naß bleibt Das Naßbleiben der Schicht 4 unterhalb der Anschmelzlinie 5 im Hals 2 kann bei fest vorgegebenem Abstand h auch durch ein entsprechendes Einstellen der Heizleistung des Infrarotstrahlers bewirkt werden.The method for producing the color picture tube according to FIG. 1 is described below with reference to FIGS. 2 to 5. The well cleaned cone 1 with the neck 2 is provided with the first conductive layer by one of the known methods. In the example shown in FIG. 2, the first layer 4 is made by casting with the aid of a pipe end 9 guided along the boundary 8. As a result, the entire inner surface of the cone 1 and the entire inner surface of the neck 2 are covered with this layer (drawn with a surface dot). Then the anode contact in the cone 1 is blown free (not shown) and then the first conductive layer 4 is dried. The drying is carried out according to FIG. 3 with infrared radiator 10, only one of which is shown. The distance h between the lower edge of the infrared radiator 10 and the fritting surface 3 is chosen so that the layer 4 dries between the boundary 8 and the melting line 5 and remains wet between the melting line 5 and the free neck end. The wet layer 4 below the melting line 5 in the neck 2 can, at a predetermined distance h, also by a appropriate setting of the heating power of the infrared radiator can be effected.

Wie in Fig. 4 dargestellt wird danach die naß gebliebene Schicht 4 unterhalb der Anschmelzlinie 5 durch Ausspülen des Halses 2 mit der Suspension der späteren zweiten Schicht entfernt Hierzu wird von unten in den Hals 2 ein Rohr 11 eingeführt, an dessen oberem Ende die Suspension 6a (schraffiert gezeichnet) der späteren zweiten Schicht austritt Das freie Ende des Rohres 11 überragt dabei etwas die Anschmelzlinie 5. Hierbei wird auch etwas die getrocknete Schicht 4 im Übergangsbereich des Konus 1 zum Hals 2 überspült, aber nicht abgewaschen. Nur die unterhalb der Anschmelzlinie 5 naß gebliebene erste Schicht wird entfernt und durch die Suspension der zweiten Schicht ersetzt. Nach dem Entfernen des Rohres 11 wird diese Schicht im Hals 2 getrocknet Zum Trocknen kann beispielsweise der Hals dem Luftstrom eines Heizgebläses - (nicht dargestellt) ausgesetzt werden. Der im Hals 2 von der zweiten Schicht 6 freizubleibende Bereich wird anschließend gemäß Fig. 5 beispielsweise durch Ausspülen mit Alkalihydroxyden, insbesondere mit einer 5-10%igen Natronlauge und einer nachfolgenden Reinigung mit einem Wischer 12 und Wasser vorgenommen. Vorzugsweise wird für das Ausspülen eine 0,5-2%ige Natronlauge verwendet. Daran kann sich eine Halsreinigung mit Flußsäure anschließen. Zum Abschluß wird der Hals 2 innen und außen mit demineralisiertem Wasser gespült. Hierbei kann zur Außenreinigung eine Ringbürste (nicht dargestellt) verwendet werden.As shown in FIG. 4, the layer 4 that remains wet below the melting line 5 is then removed by rinsing the neck 2 with the suspension of the later second layer. For this purpose, a tube 11 is inserted into the neck 2 from below, at the upper end of which the suspension 6a (hatched) the later second layer emerges. The free end of the tube 11 projects somewhat beyond the melting line 5. Here, the dried layer 4 is also somewhat washed over in the transition area from the cone 1 to the neck 2, but not washed off. Only the first layer which remains wet below the melting line 5 is removed and replaced by the suspension of the second layer. After removal of the tube 11, this layer is dried in the neck 2. For drying, the neck can, for example, be exposed to the air flow from a heating fan (not shown). The area to be left free from the second layer 6 in the neck 2 becomes on 5 for example by rinsing with alkali metal hydroxides, in particular with a 5-10% sodium hydroxide solution and subsequent cleaning with a wiper 12 and water. A 0.5-2% sodium hydroxide solution is preferably used for rinsing. This can be followed by a neck cleanse with hydrofluoric acid. Finally, the neck 2 is rinsed inside and outside with demineralized water. A ring brush (not shown) can be used for external cleaning.

Claims (7)

1. Farbbildröhre mit einer ersten leitenden Schicht ohne organische Bestandteile auf der Innenfläche ihres Konusses, dadurch gekennzeichnet, daß an diese erste Schicht (4) angrenzend auf der Innenfläche des Halses (2) der Farbbildröhre ein Bereich mit einer zweiten Schicht (6) vorhanden ist, die aus der Suspension der ersten Schicht mit einem Zusatz aus organischen Bestandteilen besteht1. Color picture tube with a first conductive layer without organic components on the inner surface of its cone, characterized in that an area with a second layer (6) is present on this first layer (4) adjacent to the inner surface of the neck (2) of the color picture tube , which consists of the suspension of the first layer with an addition of organic components 2. Farbbildröhre nach Anspruch 1, dadurch gekennzeichnet, daß der Zusatz aus Polyvinylpyrrolidon besteht.2. Color picture tube according to claim 1, characterized in that the additive consists of polyvinylpyrrolidone. 3. Farbbildröhre nach Anspruch 1, dadurch gekennzeichnet, daß die Trennlinie zwischen der ersten (4) und der zweiten Schicht (6) mit der Anschmelzlinie (5) zwischen Hals (2) und Konus (1) zusammenfällt.3. Color picture tube according to claim 1, characterized in that the dividing line between the first (4) and the second layer (6) with the melting line (5) between the neck (2) and cone (1) coincides. 4. Farbbildröhre nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Schicht (6) etwas die erste Schicht (4) überdeckt.4. Color picture tube according to claim 1, characterized in that the second layer (6) somewhat covers the first layer ( 4 ). 5. Verfahren zum Herstellen der Farbbildröhre nach einem der Ansprüche 1 bis 4, gekennzeichnet durch folgende Schritte: -Aufbringen der ersten Schicht auf die Innenseite des Konus und des Halses; -Trocknen der ersten Schicht im Bereich des Konus; -Entfernen der feuchtgebliebenen ersten Schicht im Hals durch Ausspülen mit der Suspension der zweiten Schicht und dabei -Aufbringen der zweiten Schicht auf die Innenseite des Halses; -Trocknen der zweiten Schicht im Hals; -Entfernen der zweiten Schicht im Hals von den freizubleibenden Flächen; -Reinigen der Innenseite des Halses und -Spülen der innen-und Außenseite des Halses. 5. A method for producing the color picture tube according to one of claims 1 to 4, characterized by the following steps: Applying the first layer to the inside of the cone and neck; Drying the first layer in the area of the cone; -Remove the moist first layer in the throat by rinsing with the suspension of the second layer and doing so -Applying the second layer to the inside of the neck; - drying the second layer in the throat; -Remove the second layer in the neck from the areas to be left free; -Clean the inside of your neck and - Rinse the inside and outside of your neck. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Trocknung der ersten Schicht im Konus durch Bestrahlen mit infrarotem Licht geschieht6. The method according to claim 5, characterized in that the drying of the first layer in the cone is done by irradiation with infrared light 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Grenzlinie zwischen dem zu trocknenden und dem naß zu bleibenden Bereich der ersten Schicht im Konus durch Einstellen des Abstandes des Infrarotstrahlers vom Konus erfolgt-7. The method according to claim 6, characterized in that the boundary line between the area to be dried and the area of the first layer to be kept wet is made in the cone by adjusting the distance of the infrared radiator from the cone.
EP86103550A 1985-03-28 1986-03-17 Method for the production of a colour picture tube provided with an internal conductive layer Expired - Lifetime EP0195993B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853511211 DE3511211A1 (en) 1985-03-28 1985-03-28 COLOR IMAGE TUBES WITH AN INNER CONDUCTIVE LAYER AND METHOD FOR PRODUCING THE COLOR IMAGE TUBES
DE3511211 1985-03-28

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EP0195993A2 true EP0195993A2 (en) 1986-10-01
EP0195993A3 EP0195993A3 (en) 1987-11-19
EP0195993B1 EP0195993B1 (en) 1990-01-17

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EP86103550A Expired - Lifetime EP0195993B1 (en) 1985-03-28 1986-03-17 Method for the production of a colour picture tube provided with an internal conductive layer

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US (2) US4762733A (en)
EP (1) EP0195993B1 (en)
JP (1) JPS61227349A (en)
CA (1) CA1270889A (en)
DE (2) DE3511211A1 (en)

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CA1270889A (en) 1990-06-26
DE3668395D1 (en) 1990-02-22
DE3511211A1 (en) 1986-10-09
JPS61227349A (en) 1986-10-09
EP0195993A3 (en) 1987-11-19
US4827185A (en) 1989-05-02
US4762733A (en) 1988-08-09
EP0195993B1 (en) 1990-01-17

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