EP0044454B1 - Correction filter for exposing fluorescent screens for colour picture tubes and method of manufacturing the same - Google Patents

Correction filter for exposing fluorescent screens for colour picture tubes and method of manufacturing the same Download PDF

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Publication number
EP0044454B1
EP0044454B1 EP81105216A EP81105216A EP0044454B1 EP 0044454 B1 EP0044454 B1 EP 0044454B1 EP 81105216 A EP81105216 A EP 81105216A EP 81105216 A EP81105216 A EP 81105216A EP 0044454 B1 EP0044454 B1 EP 0044454B1
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EP
European Patent Office
Prior art keywords
transmission
correction filter
spray
droplets
intensity distribution
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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.)
Expired
Application number
EP81105216A
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German (de)
French (fr)
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EP0044454A1 (en
Inventor
Nadezda Blahna
Bruno Fischer
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International Standard Electric Corp
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International Standard Electric Corp
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Publication of EP0044454A1 publication Critical patent/EP0044454A1/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
    • H01J9/2273—Auxiliary lenses and filters

Definitions

  • the invention relates to a correction filter with a light-absorbing transmission pattern for generating an exposure intensity distributed over a surface in a predetermined manner in the photochemical production of the screen of a color picture tube.
  • the applied continuous phosphor layer is irradiated with UV light through a shadow mask, whereby a chemical reaction starts which leads to the adhesion of the phosphor areas hit by the light to the front glass.
  • the exposure is additionally carried out through a lens which simulates the path of the light rays similar to the path of the electron beams.
  • a light-attenuating element namely the correction filter, is placed in the beam path, which weakens the light beams depending on the location.
  • a known correction filter (DE-OS 20 36 684) consists of a more or less strong collection of graphite particles which are attached by gelatin in the form of a layer on the lens.
  • This graphite gelatin layer leads to the intended weakening of the light passing through it, but also to an undesired change in the spectral distribution of this light.
  • the gelatin layer can either be applied to the lens itself or to a special glass plate.
  • the invention is therefore based on the object of providing a correction filter which produces sharply delimited images and which is insensitive to contact.
  • the transmission pattern consists of a distribution of mainly opaque spots of solidified droplets applied to a transparent support, the concentration distribution of which on the surface is selected in accordance with the predetermined intensity distribution.
  • dots of predominantly opaque material are arranged for the correction filter, such as those e.g. arise from the precipitation of a paint spray.
  • Such solidified drops have a diameter of approx. 5-100 ⁇ m. They are randomly distributed in their distance and size. According to the composition, e.g. made of graphite particles with binder and solvent, the solidified drop is mostly opaque in itself. The desired transmission of the covering is achieved by a reduced or increased number of precipitation per unit area.
  • the size of the solidified drops is expediently chosen to be so small that its projection from the screen / mask combination onto the light source is less than a few percent of the extension of the light source.
  • the droplets have different sizes, but on a statistical average they give the desired intensity curve; these droplets of a certain mean size correspond in the arrangement according to the invention in their number per unit area (density) to the desired intensity distribution.
  • the distance between the individual dots is a multiple of the wavelength of the light used. Such a filter therefore has no spectral response.
  • the light offered for the exposure hits the fluorescent screen in an unadulterated manner.
  • the desired occupancy density or transmission can be achieved by spraying e.g. is carried out in the form of a line, in a spiral, etc. over the surface to be applied, the feed rate being changed to a desired change in the transmission.
  • the spray jet can also be triggered in pulses, an assigned number of pulses being required for the desired transmission of the point in question, so that the covering takes place step by step and thus in a controllable manner. It is also possible for the application to take place while measuring the transmission at the same time, and for the continuous application to take place automatically in comparison with normal or input desired transmission data.
  • a method can also be used in which the spray jet strikes the entire base over a large area, a desired gradation being achieved by exchanging the screens and being sprayed repeatedly, so that by using templates and Repeated execution of the spraying the desired intensity distribution is achieved.
  • a light house for exposing color picture tube screens is shown.
  • a lamp-shaped light source 2 is located in a lamp pot 1. It is fastened in a holder 3, which contains the voltage supply for the lamp, its cooling and adjustment possibility.
  • the light emitted by the lamp passes through a window 4.
  • a light-reducing element 6 the correction filter.
  • the light falls through the shadow mask 7 onto the inner surface of the front glass of the color picture tube 8 covered with fluorescent material.
  • the opaque areas consist of spots of approx. 5-100 1 1m in diameter, some of which also flow together when the still liquid droplets of the spray mist strike.
  • the illustration in FIG. 3 shows an enlarged small area for which there is a 90% transmission.
  • the density distribution on the surface of the correction filter is variable, which according to the invention can be achieved by spraying e.g. is achieved with a moving spray jet, different spraying times, stencils, stencil sequences and moving stencils.
  • Fig. 4 shows that the occupancy density can be changed even within a small area.

Description

Die Erfindung betrifft einen Korrekturfilter mit einem lichtabsorbierenden Transmissionsmuster zur Erzeugung einer über eine Fläche in vorgegebener Weise verteilten Belichtungsintensität bei der fotochemischen Herstellung des Bildschirmes einer Farbbildröhre.The invention relates to a correction filter with a light-absorbing transmission pattern for generating an exposure intensity distributed over a surface in a predetermined manner in the photochemical production of the screen of a color picture tube.

Bei der Herstellung von Farbbildröhren wird die aufgebrachte kontinuierliche Leuchtstoffschicht durch eine Schattenmaske hindurch mit UV-Licht bestrahlt, wobei eine chemische Reaktion in Gang kommt, die zur Haftung der vom Licht getroffenen Leuchtstoffgebiete am Frontglas führt.In the manufacture of color picture tubes, the applied continuous phosphor layer is irradiated with UV light through a shadow mask, whereby a chemical reaction starts which leads to the adhesion of the phosphor areas hit by the light to the front glass.

Um die Leuchtstoffgebiete dort anzubringen, wo sie im Betrieb der Röhre von den durch die Löcher der Schattenmaske dringenden Elektronen getroffen werden können, erfolgt die Belichtung zusätzlich durch eine Linse hindurch, welche den Weg der Lichtstrahlen ähnlich dem Weg der Elektronenstrahlen nachbildet.In order to place the phosphor areas where they can be hit by the electrons penetrating through the holes in the shadow mask during operation of the tube, the exposure is additionally carried out through a lens which simulates the path of the light rays similar to the path of the electron beams.

Um weiterhin Einfluss auf die Breitenverteilung der Leuchtstoffgebiete nehmen zu können, wird in den Strahlengang ein lichtschwächendes Element, nämlich das Korrekturfilter, gebracht, welches die Lichtstrahlen in Abhängigkeit vom Ort schwächt.In order to be able to continue to influence the width distribution of the phosphor regions, a light-attenuating element, namely the correction filter, is placed in the beam path, which weakens the light beams depending on the location.

Ein bekanntes Korrekturfilter (DE-OS 20 36 684) besteht aus einer mehr oder weniger starken Ansammlung von Graphitteilchen, die durch Gelatine befestigt in Form einer Schicht auf der Linse aufgebracht sind.A known correction filter (DE-OS 20 36 684) consists of a more or less strong collection of graphite particles which are attached by gelatin in the form of a layer on the lens.

Diese Graphit-Gelatineschicht führt zu der beabsichtigten Schwächung des durch sie hindurchtretenden Lichtes, aber auch weiterhin zu einer unerwünschten Änderung der spektralen Verteilung dieses Lichtes.This graphite gelatin layer leads to the intended weakening of the light passing through it, but also to an undesired change in the spectral distribution of this light.

Die Gelatine-Schicht kann entweder auf die Linse selbst oder auf eine spezielle Glasplatte aufgebracht sein.The gelatin layer can either be applied to the lens itself or to a special glass plate.

Bei Belichtung durch derartiges Filter ergeben sich auf dem Bildschirm zwar Leuchtstoffgebiete von gewünschter Grösse, jedoch von ausgebrochener Berandung. Ferner ist die Schicht des Filters selbst sehr empfindlich und kann durch leichtes Berühren zerstört werden.When exposed through such a filter, fluorescent areas of the desired size appear on the screen, but with broken edges. Furthermore, the layer of the filter itself is very sensitive and can be destroyed by lightly touching it.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Korrekturfilter zu schaffen, das scharf berandete Abbildungen erzeugt und das unempfindlich gegen Berührung ist.The invention is therefore based on the object of providing a correction filter which produces sharply delimited images and which is insensitive to contact.

Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass das Transmissionsmuster aus einer Verteilung von auf einem transparenten Träger aufgebrachten, vorwiegend lichtundurchlässigen Pünktchen aus erstarrten Tröpfchen besteht, deren Konzentrationsverteilung auf der Fläche entsprechend der vorgegebenen Intensitätsverteilung gewählt ist.According to the invention, this object is achieved in that the transmission pattern consists of a distribution of mainly opaque spots of solidified droplets applied to a transparent support, the concentration distribution of which on the surface is selected in accordance with the predetermined intensity distribution.

Für das Korrekturfilter werden erfindungsgemäss Pünktchen aus vorwiegend lichtundurchlässigem Material angeordnet, wie sie z.B. aus dem Niederschlag eines Lacksprühnebels entstehen. Derartige erstarrte Tropfen haben einen Durchmesser von ca. 5-100 µm. Sie sind in ihrem Abstand und ihrer Grösse regellos verteilt. Entsprechend der Zusammensetzung, z.B. aus Graphitteilchen mit Bindemittel und Lösungsmittel, ist der erstarrte Tropfen in sich vorwiegend lichtundurchlässig. Die gewünschte Transmission der Bedeckung wird durch eine verringerte oder vergrösserte Anzahl der Niederschläge pro Flächeneinheit erreicht. Die Grösse der erstarrten Tropfen wird zweckmässigerweise so klein gewählt, dass ihre Projektion von der Schirm-Masken-Kombination auf die Lichtquelle kleiner als einige Prozent der Ausdehnung der Lichtquelle ist.According to the invention, dots of predominantly opaque material are arranged for the correction filter, such as those e.g. arise from the precipitation of a paint spray. Such solidified drops have a diameter of approx. 5-100 µm. They are randomly distributed in their distance and size. According to the composition, e.g. made of graphite particles with binder and solvent, the solidified drop is mostly opaque in itself. The desired transmission of the covering is achieved by a reduced or increased number of precipitation per unit area. The size of the solidified drops is expediently chosen to be so small that its projection from the screen / mask combination onto the light source is less than a few percent of the extension of the light source.

Die Tröpfchen haben erfindungsgemäss zwar unterschiedliche Grösse, im statistischen Mittel ergeben sie jedoch den gewünschten Intensitätsverlauf; diese Tröpfchen einer bestimmten mittleren Grösse entsprechen nämlich bei der erfindungsgemässen Anordnung in ihrer Anzahl pro Flächeneinheit (Dichte) der gewünschten Intensitätsverteilung. In dem zur Diskussion stehenden Transmissionsbereich für ein Korrekturfilter für die Belichtung von Leuchtstoffschirmen für Farbbildröhren beträgt der Abstand der einzelnen Pünktchen ein Vielfaches der Wellenlänge des verwendeten Lichtes. Ein derartiges Filter hat somit keinen Spektralgang. Das für die Belichtung angebotene Licht trifft unverfälscht auf den Leuchtstoffschirm.According to the invention, the droplets have different sizes, but on a statistical average they give the desired intensity curve; these droplets of a certain mean size correspond in the arrangement according to the invention in their number per unit area (density) to the desired intensity distribution. In the transmission range under discussion for a correction filter for the exposure of fluorescent screens for color picture tubes, the distance between the individual dots is a multiple of the wavelength of the light used. Such a filter therefore has no spectral response. The light offered for the exposure hits the fluorescent screen in an unadulterated manner.

Die Herstellung eines derartigen Filters erfolgt dem Prinzip nach mit einer Sprühpistole, doch wird der Lack nicht wie bei dem üblichen Lackieren flüssig auf die Unterlage gebracht, wo sich ein flüssiger Film bildet, der mit zunehmendem Auftragen dicker und damit undurchlässiger wird. Es wird vielmehr ein lichtundurchlässig trocknender Lack gewählt, der auf dem Weg nach dem Austritt aus der Sprühpistole sich zu Tröpfchen zusammenfügt, welche sich in Form geschlossener Fleckchen niederschlagen.The production of such a filter is principally carried out with a spray gun, but the paint is not applied liquid to the base, as is the case with conventional painting, where a liquid film is formed which becomes thicker and therefore more impervious with increasing application. Rather, an opaque drying lacquer is chosen which, on the way out of the spray gun, assembles into droplets which form in the form of closed spots.

Die gewünschte Belegungsdichte bzw. Transmission kann dadurch erreicht werden, dass der Sprühstrahl z.B. zeilenförmig, spiralförmig usw. über die aufzubringende Fläche geführt wird, wobei zu einer gewünschten Veränderung der Transmission die Vorschubgeschwindigkeit geändert wird. Es kann auch ein impulsweises Auslösen des Sprühstrahles erfolgen, wobei für die gewünschte Transmission der betreffenden Stelle eine zugeordnete Anzahl von Impulsen erforderlich ist, so dass die Bedeckung schrittweise und somit steuerbar erfolgt. Es ist ferner möglich, dass die Aufbringung unter gleichzeitigem Messen der Transmission erfolgt und die fortlaufende Aufbringung unter Vergleich mit Normal- oder eingegebenen Soll-Transmissions-Daten automatisch geschieht.The desired occupancy density or transmission can be achieved by spraying e.g. is carried out in the form of a line, in a spiral, etc. over the surface to be applied, the feed rate being changed to a desired change in the transmission. The spray jet can also be triggered in pulses, an assigned number of pulses being required for the desired transmission of the point in question, so that the covering takes place step by step and thus in a controllable manner. It is also possible for the application to take place while measuring the transmission at the same time, and for the continuous application to take place automatically in comparison with normal or input desired transmission data.

Es könnte ferner vorteilhaft sein, den Sprühstrahl durch Abdecken mit Schablonen in der Ausdehnung zu begrenzen, um gezielt kleinere Flächen zu behandeln. Es kann auch ein Verfahren angewendet werden, bei dem der Sprühstrahl grossflächig die ganze Unterlage trifft, wobei eine gewünschte Abstufung durch Austausch der Blenden erfolgt und wiederholt gesprüht wird, so dass durch Verwendung von Schablonen und mehrmaliger Ausführung der Besprühung die gewünschte Intensitätsverteilung erzielt wird.It could also be advantageous to limit the extent of the spray jet by covering it with templates in order to treat smaller areas in a targeted manner. A method can also be used in which the spray jet strikes the entire base over a large area, a desired gradation being achieved by exchanging the screens and being sprayed repeatedly, so that by using templates and Repeated execution of the spraying the desired intensity distribution is achieved.

Zur ergänzenden Erläuterung sei die Erfindung im Folgenden noch an Hand von Figuren und Bildern beschrieben:

  • Fig. 1 zeigt die Anordnung zur Belichtung von Farbbildröhrenschirmen, in der das Korrekturfilter als lichtschwächendes Element verwendet wird.
  • Fig. 2 zeigt als Diagramm die Transmission von Korrekturfiltern nach dem Stand der Technik.
  • Fig. 3 ist eine stark vergrösserte Abbildung eines kleinen Bereiches des erfindungsgemässen Korrekturfilters.
  • Fig. 4 wie Abbildung in Fig. 3, jedoch mit unterschiedlicher Lichtschwächung infolge unterschiedlicher Fleckchendichte.
For additional explanation, the invention is described below with reference to figures and pictures:
  • Fig. 1 shows the arrangement for exposing color picture tube screens, in which the correction filter is used as a light-attenuating element.
  • 2 shows a diagram of the transmission of correction filters according to the prior art.
  • 3 is a greatly enlarged illustration of a small area of the correction filter according to the invention.
  • Fig. 4 as in Fig. 3, but with different light attenuation due to different spot density.

In Fig. 1 ist ein Lichthaus zur Belichtung von Farbbildröhrenschirmen dargestellt. In einem Lampentopf 1 befindet sich eine stabförmige Lichtquelle 2. Sie ist in einer Halterung 3 befestigt, die die Spannungszuführung für die Lampe, deren Kühlung und Justiermöglichkeit beinhaltet. Das von der Lampe abgegebene Licht tritt durch ein Fenster 4. Unter, über oder auf der Linse 5 befindet sich ein lichtschwächendes Element 6, das Korrekturfilter. Schliesslich fällt das Licht durch die Schattenmaske 7 auf die mit Leuchtstoff belegte Innenfläche des Frontglases der Farbbildröhre 8.In Fig. 1 a light house for exposing color picture tube screens is shown. A lamp-shaped light source 2 is located in a lamp pot 1. It is fastened in a holder 3, which contains the voltage supply for the lamp, its cooling and adjustment possibility. The light emitted by the lamp passes through a window 4. Below, above or on the lens 5 is a light-reducing element 6, the correction filter. Finally, the light falls through the shadow mask 7 onto the inner surface of the front glass of the color picture tube 8 covered with fluorescent material.

Bei Korrekturfiltern nach dem Stand der Technik stört insbesondere die Abhängigkeit der Transmission von der Wellenlänge im Strahlungsspektrum des von der Lichtquelle 2 ausgesandten Lichtes. Dazu ist in Fig. 2 die Transmission von vier verschieden starken Graphit-Gelatine-Bedekkungen in Abhängigkeit der Wellenlänge wiedergegeben. Die Messergebnisse zeigen eine Zunahme der Transmission mit zunehmender Wellenlänge und eine Veränderung des Verhältnisses der vier Bedeckungen zueinander.In the case of correction filters according to the prior art, the dependence of the transmission on the wavelength in the radiation spectrum of the light emitted by the light source 2 interferes in particular. For this purpose, the transmission of four differently strong graphite-gelatin coverings as a function of the wavelength is shown in FIG. 2. The measurement results show an increase in transmission with increasing wavelength and a change in the ratio of the four coverings to one another.

Beim erfindungsgemässen Korrekturfilter ist diese Wellenlängenabhängigkeit nicht vorhanden, wodurch das Ausbrechen der Berandung vermieden wird. Die lichtundurchlässigen Bereiche bestehen aus Fleckchen von ca. 5-100 11m Durchmesser, die beim Auftreffen der noch flüssigen Tröpfchen des Sprühnebels zum Teil auch zusammengeflossen sind. Die Abbildung in Fig. 3 zeigt vergrössert einen kleinen Bereich, für den sich eine 90%ige Transmission ergibt.This wavelength dependency is not present in the correction filter according to the invention, as a result of which the edge is not broken out. The opaque areas consist of spots of approx. 5-100 1 1m in diameter, some of which also flow together when the still liquid droplets of the spray mist strike. The illustration in FIG. 3 shows an enlarged small area for which there is a 90% transmission.

Die Dichteverteilung ist auf der Fläche des Korrekturfilters veränderlich, was nach der Erfindung durch Besprühen z.B. mit bewegtem Sprühstrahl, unterschiedlicher Sprühdauer, Schablonen, Schablonenfolgen und bewegten Schablonen erreicht wird. Fig. 4 zeigt, dass sich die Belegungsdichte schon innerhalb eines kleinen Gebietes ändern lässt.The density distribution on the surface of the correction filter is variable, which according to the invention can be achieved by spraying e.g. is achieved with a moving spray jet, different spraying times, stencils, stencil sequences and moving stencils. Fig. 4 shows that the occupancy density can be changed even within a small area.

Claims (9)

1. Correction filter with a light-absorbing transmission pattern for generating, during the photochemical manufacture of the screen of a colour- picture tube, an exposure intensity distributed over an area in a pre-determined manner, characterized in that the transmission pattern consists of a distribution of predominantly opaque spots formed by solidified droplets which are applied to a transparent support and whose concentration profile is chosen in accordance with the predetermined intensity distribution.
2. A correction filter as claimed in claim 1, characterized in that the droplets are different in size but, on a statistical average, give the desired intensity distribution.
3. A correction filter as claimed in claim 2, characterized in that the number of droplets of different size per unit area corresponds to the desired intensity distribution.
4. Method of manufacturing a correction filter as claimed in claim 1, 2 or 3, characterized in that the desired intensity distribution is achieved by using stencils and/or performing several spraying operations.
5. A method as claimed in claim 4, characterized in that a paint is chosen which, after emerging from a spray gun, gathers into droplets depositing in the form of closed spots, and dries to opacity.
6. A method as claimed in claim 4, characterized in that the desired density or transmission is obtained by moving the spray over the support along straight or spiral paths, for example, a desired change in transmission being obtained by varying the rate of movement of the spray.
7. A method as claimed in claim 4, characterized in that to change the transmission, the spray is released in a pulsed mode of operation, in which case the desired transmission of the respective zone requires a given number of pulses, the application of paint thus taking place step by step and, hence, being controllable, and that continuous application is effected automatically with comparison with such transmission data.
8. A method as claimed in claim 4, characterized in that the extent of the spray is limited by covering the support with stencils.
9. A method as claimed in claim 4, characterized in that the desired gradation is effected by exchanging the stencils and performing several spraying operations.
EP81105216A 1980-07-22 1981-07-04 Correction filter for exposing fluorescent screens for colour picture tubes and method of manufacturing the same Expired EP0044454B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3027704A DE3027704C2 (en) 1980-07-22 1980-07-22 Process for the production of a correction filter for the exposure of the fluorescent screens of color picture tubes
DE3027704 1980-07-22

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EP0044454A1 EP0044454A1 (en) 1982-01-27
EP0044454B1 true EP0044454B1 (en) 1984-10-24

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EP (1) EP0044454B1 (en)
JP (1) JPS5753045A (en)
DE (2) DE3027704C2 (en)

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DE3239559A1 (en) * 1982-10-26 1984-04-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart LOW-LOSS CORRECTION FILTER FOR THE PRODUCTION OF LUMINAIRES FOR COLOR PIPES
US6551678B1 (en) 1999-10-09 2003-04-22 Formica Corporation Deep embossed tile design postformable high pressure decorative laminate and method for producing same

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE2036684A1 (en) * 1969-07-25 1971-01-28 RCA Corp , New York NY (V St A ) Process for the photographic printing of a fluorescent screen for a cathode ray tube

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DE1762428B1 (en) * 1968-06-14 1970-06-18 Philips Patentverwaltung Process for shortening the exposure time in the production of a fluorescent pattern for color picture display tubes
US3773541A (en) * 1970-11-02 1973-11-20 Gte Sylvania Inc Process for achieving a controlled gradient density coating on a light attenuation medium
JPS5040939B1 (en) * 1971-03-05 1975-12-27
BE790090A (en) * 1971-10-14 1973-04-13 Philips Nv IRRADIATION DEVICE USED FOR THE MANUFACTURE OF A COLOR TELEVISION TUBE WITH SHADOW MASK
DE2153905A1 (en) * 1971-10-29 1973-05-03 Licentia Gmbh PROCESS FOR PRODUCING A FILTER DIFFERENT IN ITS AREA-RELATED TRANSPARENCY
GB1481979A (en) * 1973-08-29 1977-08-03 Hitachi Ltd Light exposure apparatus for manufacturing colour picture tube
FR2312790A1 (en) * 1975-05-27 1976-12-24 Thomson Csf OPTICAL IMAGE GAIN SPATIAL NON-UNIFORMITY CORRECTIVE FILM
DE2528039C3 (en) * 1975-06-24 1978-03-23 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Process for the production of optical gray wedges

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE2036684A1 (en) * 1969-07-25 1971-01-28 RCA Corp , New York NY (V St A ) Process for the photographic printing of a fluorescent screen for a cathode ray tube

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US4374866A (en) 1983-02-22
DE3027704A1 (en) 1982-02-11
EP0044454A1 (en) 1982-01-27
DE3166818D1 (en) 1984-11-29
JPS5753045A (en) 1982-03-29
DE3027704C2 (en) 1984-03-22

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