DE3427009A1 - Sedimentation process for manufacturing a luminescent screen - Google Patents

Sedimentation process for manufacturing a luminescent screen

Info

Publication number
DE3427009A1
DE3427009A1 DE19843427009 DE3427009A DE3427009A1 DE 3427009 A1 DE3427009 A1 DE 3427009A1 DE 19843427009 DE19843427009 DE 19843427009 DE 3427009 A DE3427009 A DE 3427009A DE 3427009 A1 DE3427009 A1 DE 3427009A1
Authority
DE
Germany
Prior art keywords
electrolyte solution
luminescent screen
ethylene glycol
manufacturing
aqueous
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.)
Withdrawn
Application number
DE19843427009
Other languages
German (de)
Inventor
Kanagaratnam 7915 Elchingen Anandasivam
Klaus Gerland
Rolf 7900 Ulm Grießmayr
Georg 7909 Dornstadt Groner
Irene 7958 Laupheim Kienle
Rainer Kolbeck
Ulrich Kube
Hermann Dr.Rer.Nat. 7900 Ulm Widmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19843427009 priority Critical patent/DE3427009A1/en
Publication of DE3427009A1 publication Critical patent/DE3427009A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/22—Luminescent screens characterised by the binder or adhesive for securing the luminescent material to its support, e.g. vessel
    • 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
    • H01J9/221—Applying luminescent coatings in continuous layers
    • H01J9/224—Applying luminescent coatings in continuous layers by precipitation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Luminescent Compositions (AREA)

Abstract

In order to achieve an increased packing density of a luminescent screen manufactured by sedimentation it is proposed to admix the electrolyte with glycerol and/or ethylene glycol.

Description

Beschreibungdescription

Sodilleil Üa t;i.ollavorrahrer, zum llerstellen eines Leuchtschirms Die vorliegende Erfindung betrifft ein Verfahren nach dem Oberbegriff es vorliegenden Patentanspruches 1.Sodilleil Üa t; i.ollvorrahrer, for setting up a fluorescent screen The present invention relates to a method according to the preamble of the present invention Claim 1.

Es ist bekannt, Leuchtschirme für Kathodenstrahlröhren, wie z. B. Oszillographenröhren oder Fernsehbildröhren, durch Sedimentieren eines pulverförmigen Leuchtstoffes in wässerigem Medium herzustellen. Zum Befestigen der Leuchtstoffteilchen wird als Kleber vorzugsweise ein Wasserglas, insbesondere Kaliwasserglas, verwendet. bei diesem bekannten Verfahren wird eine wässerige, z. B. kaliwasserglashaltige Leuchtstoffsuspension in eine wässerige Elektrolytlösung, die über der Leuchtstoffträgerfläche steht, eingeleitet, beispielsweise mit Hilfe einer Düse. Die Aufgabe des Elektrolyten ist es, die Kieselsäure auf das Leuchtstoffkorn zu fällen. Über die gefällte Kieselsäure wird dann der Leuchtstoff an der Frontscheibe festgeklebt.It is known to use fluorescent screens for cathode ray tubes, such as. B. Oscillograph tubes or television picture tubes, by sedimenting a powdery one Produce phosphor in an aqueous medium. For attaching the fluorescent particles a water glass, in particular potassium water glass, is preferably used as the adhesive. In this known method, an aqueous, z. B. Potash containing glass Fluorescent suspension in an aqueous electrolyte solution, which is placed over the fluorescent support surface stands, initiated, for example with the help of a nozzle. The job of the electrolyte is to precipitate the silica onto the phosphor grain. About the precipitated silica the phosphor is then glued to the windshield.

Die Helligkeit und das Auflösungsvermögen eines Leuchtschirmes wird nicht zuletzt auch durch die Packungsdichte der Leuchtstoffschicht beeinflußt. Die Packungsdichte wiederum wird auch dadurch beeinflußt, in welcher Form die Kieselsäure gefällt wird.The brightness and resolution of a fluorescent screen is not least influenced by the packing density of the phosphor layer. the Packing density, in turn, is also influenced by the form in which the silica is used is felled.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit welchem Leuchtschirme hoher Packungsdichte und möglichst glatter Oberfläche herstellbar sind.The present invention is based on the object of a method indicate with which fluorescent screens of high packing density and as smooth as possible Surface can be produced.

Diese Aufgabe wird gemäß der Erfindung durch die in dem Kennzeichen des Patentanspruches 1 angegebenen Merkmale gelöst.This object is achieved according to the invention by the in the characterizing part of claim 1 specified features solved.

Es hat sich gezeigt, daß durch den Zusatz von Glycerin und/oder Äthylenglykol zu der Elektrolytlösung die Kieselsäure in äußerst feiner Form ausgefällt wird, wodurch eine sehr dichte, gut haftende und eine geringe Oberflächenrauhigkeit aufweisende Leuchtstoffschicht herstellbar ist.It has been shown that the addition of glycerine and / or ethylene glycol the silica is precipitated in extremely fine form in addition to the electrolyte solution, whereby a very dense, well-adhering and a low surface roughness exhibiting Phosphor layer can be produced.

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird nachfolgend näher beschrieben.A preferred embodiment of the invention is described below described in more detail.

Es wird eine Leuchtstoffsuspension hergestellt, in welcher der pulverförmige Leuchtstoff in einer Kaliwasserglaslösung aufgeschlämmt ist. Über der im allgemeinen aus Glas bestehenden Leuchtschirmträgerfläche steht eine wässerige Elektrolytlösung, die als Bestandteil z. B. Ba(N03)2 und/oder Sr(N03)2 in Ionenform enthält. Die Leuchtstoffsuspension wird zweckmäßig über eine Düse in die Elektrolytlösung eingeleitet, Der Elektrolytlösung ist nun vor Einleiten der Leuchtstoffsuspension gemäß der Erfindung Glycerin oder Äthylenglykol zugesetzt worden. Mengenmäßig werden bevorzugt 0,1 bis 2QO ml Glycerin oder Äthylenglykol pro 400 ml der Elektrolytlösung zugesetzt. Bei einem bevorzugten Ausführungsbeispiel wurden etwa 5 ml Glycerin zugesetzt. Durch die Zugabe von Glycerin und/oder Äthylenglykol wird der Fällungsprozeß verlangsamt und Kieselsäure in äußerst feiner Verteilung ausgeschieden, wodurch eine Leuchtstoffschicht hoher Packungsdichte auf dem Leuchtschirmträg.er gebildet wird.A phosphor suspension is produced in which the powdery Phosphor is slurried in a potassium silicate solution. About that in general made of glass, there is an aqueous electrolyte solution, as part of z. B. Ba (N03) 2 and / or Sr (N03) 2 in ionic form. The phosphor suspension is expediently introduced into the electrolyte solution via a nozzle, the electrolyte solution is now before introducing the phosphor suspension according to the invention Glycerin or ethylene glycol has been added. In terms of quantity, 0.1 to 20 ml is preferred Glycerin or ethylene glycol added per 400 ml of the electrolyte solution. At a In the preferred embodiment, about 5 ml of glycerin were added. By adding Glycerine and / or ethylene glycol slows down the precipitation process and silica excreted in extremely fine distribution, creating a higher phosphor layer Packing density is formed on the luminescent screen carrier.

Es kann ggf. zweckmäßig sein, der Elektrolytlösung zusätzlich noch oberflächenaktive Stoffe zuzusetzen.It may be useful to add the electrolyte solution as well add surface-active substances.

Claims (4)

Patentansprüche Sedimentationsverfahren zum Herstellen eines Leuchtschirms für Kathodenstrahlröhren, bei dem eine wässerige Wasserglas enthaltende Leuchtstoffsuspension in eine über der Trägerfläche stehende wässerige Elektrolytlösung oingeloitct wird, dadurch gekennzeichnet, daß der Blektrolytlösung Glycerin und/oder Äthylenglykol zugesetzt wird.Claims Sedimentation method for producing a luminescent screen for cathode ray tubes, in which an aqueous waterglass-containing phosphor suspension is oingeloitct in an aqueous electrolyte solution standing above the support surface, characterized in that the lead electrolyte solution is glycerol and / or ethylene glycol is added. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Elektrolytlösung Glycerin und/oder Äthylenglykol in Mengen von 0,1 bis 20 ml pro 400 ml, insbesondere etwa 5 ml pro 400 ml, zugesetzt werden.2. The method according to claim 1, characterized in that the electrolyte solution Glycerin and / or ethylene glycol in amounts of 0.1 to 20 ml per 400 ml, in particular about 5 ml per 400 ml. 3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß Kaliwasserglas als Kleber verwendet wird.3. The method according to claim 1 or claim 2, characterized in that that potassium water glass is used as an adhesive. 4. Verfahren nach. einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die wässerige Elektrolytlösung Ba(N03)2 und/oder Sr(N03)2 als ionisierenden Bestandteil enthält.4. Procedure according to. one of claims 1 to 3, characterized in that that the aqueous electrolyte solution Ba (N03) 2 and / or Sr (N03) 2 as ionizing Contains component.
DE19843427009 1984-07-21 1984-07-21 Sedimentation process for manufacturing a luminescent screen Withdrawn DE3427009A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843427009 DE3427009A1 (en) 1984-07-21 1984-07-21 Sedimentation process for manufacturing a luminescent screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843427009 DE3427009A1 (en) 1984-07-21 1984-07-21 Sedimentation process for manufacturing a luminescent screen

Publications (1)

Publication Number Publication Date
DE3427009A1 true DE3427009A1 (en) 1986-01-23

Family

ID=6241276

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843427009 Withdrawn DE3427009A1 (en) 1984-07-21 1984-07-21 Sedimentation process for manufacturing a luminescent screen

Country Status (1)

Country Link
DE (1) DE3427009A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0750331A2 (en) * 1995-06-21 1996-12-27 Sony Corporation Method of forming fluorescent screen of cathode ray tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0750331A2 (en) * 1995-06-21 1996-12-27 Sony Corporation Method of forming fluorescent screen of cathode ray tube
EP0750331A3 (en) * 1995-06-21 1997-05-28 Sony Corp Method of forming fluorescent screen of cathode ray tube

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