EP0374571A2 - Surface de contact composée d'une suspension de graphite - Google Patents

Surface de contact composée d'une suspension de graphite Download PDF

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Publication number
EP0374571A2
EP0374571A2 EP89122354A EP89122354A EP0374571A2 EP 0374571 A2 EP0374571 A2 EP 0374571A2 EP 89122354 A EP89122354 A EP 89122354A EP 89122354 A EP89122354 A EP 89122354A EP 0374571 A2 EP0374571 A2 EP 0374571A2
Authority
EP
European Patent Office
Prior art keywords
graphite
tub
contact
suspension
composée
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
EP89122354A
Other languages
German (de)
French (fr)
Other versions
EP0374571B1 (en
EP0374571A3 (en
Inventor
Heinz Beckerle
Rolf Reidinger
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.)
Panasonic Holdings Corp
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
Nokia Deutschland 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 Nokia Unterhaltungselektronik Deutschland GmbH, Nokia Deutschland GmbH filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0374571A2 publication Critical patent/EP0374571A2/en
Publication of EP0374571A3 publication Critical patent/EP0374571A3/en
Application granted granted Critical
Publication of EP0374571B1 publication Critical patent/EP0374571B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 graphite-containing conductive suspension for a contact surface on the inner edge of a tub of a picture tube.
  • the phosphors After the phosphors have been introduced into the tub of the picture tube, they are usually covered with a layer of lacquer. Subsequently, contact lines from a graphite-containing conductive suspension are applied to the inner edge of the tub, starting from the holding pins for the shadow mask to be used later. After the contact lines have been applied, a thin aluminum layer is evaporated onto the inside of the tub in a high vacuum. In the finished state of the picture tube, the contact lines connect the aluminum layer in the tub to the shadow mask via the holding pins. This is connected via a spring to the inner conductive layer in the piston of the picture tube and thus to the high-voltage connection (FUNK-TECHNIK, 1967, No. 16, pages 576 to 580).
  • the invention has for its object to provide a guide suspension for a contact surface on the inner edge of the tub of a picture tube.
  • the lead suspension consists of graphite, iron oxide, water glass and water.
  • the solids content should be 30 to 40% by weight, preferably 35% by weight.
  • This master suspension dries quickly and washable on the glass of the inner edge, so that it can be used in an automated production line with short cycle times. It also does not change due to contact with the paint layer, so that it can even be applied before painting. When the tub is heated, this conductive suspension does not cause any bubbles in the aluminum layer and is then abrasion-resistant and very low-resistance. Resistance values of less than 500 ohms result with a test area of 10 mm by 20 mm.
  • the conductive suspension can be applied to the inner edge of the tub by printing, preferably pad printing.
  • the contact area thus generated is so good that a single area per well for the connection of the aluminum layer via, for example A spring attached to the frame of the shadow mask with the inner conductive layer in the cone is sufficient.
  • the contact area must be so large that a good, low-resistance connection with the aluminum layer is achieved and the contact ends of the spring lie securely on the contact area.
  • the contact area preferably has the dimensions 20 mm by 40 mm and its layer thickness is approximately 10 to 30 micrometers, preferably 20 micrometers. Because of this great thickness, a corresponding depth in the cliché of the printing device is required; it is approximately 100 micrometers with a layer thickness of 20 micrometers.
  • the conductive suspension is printed on the inner edge of the tub to produce the contact surface.
  • the phosphor layer and the contact surface are then dried, which can be done, for example, by using radiant heaters.
  • the lacquer film is applied and then the tub is aluminized. This is followed by the other usual manufacturing steps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cookers (AREA)

Abstract

The conductive suspension for the internal contacting of picture tubes is composed of graphite, iron oxide, water glass and water. It can be applied by pressing before the varnishing and aluminising of the screen tub and permits simultaneous fritting and full curing of the picture tube.

Description

Die Erfindung bezieht sich auf eine graphithaltige Leitsuspension für eine Kontaktfläche auf dem Innenrand einer Wanne einer Bildröhre.The invention relates to a graphite-containing conductive suspension for a contact surface on the inner edge of a tub of a picture tube.

Üblicherweise werden nach dem Einbringen der Phosphore in die Wanne der Bildröhre diese mit einer Lackschicht abgedeckt. Anschließend werden Kontaktstriche aus einer graphithaltigen Leitsuspension auf den Innenrand der Wanne angebracht, die von den Haltestiften für die später eingesetzte Schattenmaske ausgehen. Nach dem Aufbringen der Kontaktstriche wird eine dünne Aluminiumschicht auf die Innenseite der Wanne im Hochvakuum aufgedampft. Im fertigen Zustand der Bildröhre verbinden die Kontaktstriche die Aluminiumschicht in der Wanne über die Haltestifte mit der Schattenmaske. Diese ist über eine Feder mit der Innenleitschicht im Kolben der Bildröhre und dadurch mit dem Hochspannungsanschluß verbunden (FUNK-TECHNIK, 1967, Nr. 16, Seite 576 bis 580).After the phosphors have been introduced into the tub of the picture tube, they are usually covered with a layer of lacquer. Subsequently, contact lines from a graphite-containing conductive suspension are applied to the inner edge of the tub, starting from the holding pins for the shadow mask to be used later. After the contact lines have been applied, a thin aluminum layer is evaporated onto the inside of the tub in a high vacuum. In the finished state of the picture tube, the contact lines connect the aluminum layer in the tub to the shadow mask via the holding pins. This is connected via a spring to the inner conductive layer in the piston of the picture tube and thus to the high-voltage connection (FUNK-TECHNIK, 1967, No. 16, pages 576 to 580).

Der Erfindung liegt die Aufgabe zugrunde, eine Leitsuspension für eine Kontaktfläche auf den Innenrand der Wanne einer Bildröhre anzugeben.The invention has for its object to provide a guide suspension for a contact surface on the inner edge of the tub of a picture tube.

Diese Aufgabe wird dadurch gelöst, daß die Leitsuspension neben Graphit aus Eisenoxid, Wasserglas und Wasser besteht. Der Festkörperanteil soll 30 bis 40 Gew.%, vorzugsweise 35 Gew.% betragen.This object is achieved in that the lead suspension consists of graphite, iron oxide, water glass and water. The solids content should be 30 to 40% by weight, preferably 35% by weight.

Diese Leitsuspension trocknet schnell und waschfest auf dem Glas des Innenrandes, so daß sie in einer automatisierten Fertigungsstraße mit kurzen Taktzeiten eingesetzt werden kann. Sie verändert sich auch nicht durch den Kontakt mit der Lackschicht, so daß sie sogar vor dem Lackieren aufgebracht werden kann. Beim Ausheizen der Wanne verursacht diese Leitsuspension keine Blasen in der Aluminiumschicht und sie ist danach abriebfest und sehr niederohmig. Es ergeben sich Widerstandswerte von kleiner 500 Ohm bei einer Prüffläche von 10 mm mal 20 mm.This master suspension dries quickly and washable on the glass of the inner edge, so that it can be used in an automated production line with short cycle times. It also does not change due to contact with the paint layer, so that it can even be applied before painting. When the tub is heated, this conductive suspension does not cause any bubbles in the aluminum layer and is then abrasion-resistant and very low-resistance. Resistance values of less than 500 ohms result with a test area of 10 mm by 20 mm.

Die genannten Vorteile gestatten es, den erforderlichen Ausheizvorgang der Wanne und den Frittprozeß zum Verbinden der Wanne mit dem Konus in einem einzigen Schritt durchzuführen. Außerdem ist diese Leitsuspension von fehlerhaften Wannen, die nach einer Reinigung wiederverwendet werden sollen, durch Waschen leicht entfernbar.The advantages mentioned allow the required heating of the tub and the fritting process for connecting the tub to the cone to be carried out in a single step. In addition, this key suspension can be easily removed from faulty tubs that are to be reused after cleaning.

Die Leitsuspension kann durch Drucken, vorzugsweise einem Tampondruck auf den Innenrand der Wanne aufgebracht werden. Die so erzeugte Kontaktfläche ist so gut, daß eine einzige Fläche pro Wanne für die Verbindung der Aluminiumschicht über eine beispielsweise am Rahmen der Schattenmaske angebrachte Feder mit der Innenleitschicht im Konus genügt. Die Kontaktfläche muß so groß sein, daß eine gute, niederohmige Verbindung mit der Aluminiumschicht zustande kommt und die Kontaktenden der Feder sicher auf der Kontaktfläche liegen. Vorzugsweise besitzt die Kontaktfläche die Maße 20 mm mal 40 mm und ihre Schichtdicke beträgt etwa 10 bis 30 Mikrometer, vorzugsweise 20 Mikrometer. Wegen dieser großen Dicke ist eine entsprechende Tiefe im Klischee der Druckvorrichtung erforderlich, sie liegt bei einer Schichtdicke von 20 Mikrometern etwa bei 100 Mikrometer.The conductive suspension can be applied to the inner edge of the tub by printing, preferably pad printing. The contact area thus generated is so good that a single area per well for the connection of the aluminum layer via, for example A spring attached to the frame of the shadow mask with the inner conductive layer in the cone is sufficient. The contact area must be so large that a good, low-resistance connection with the aluminum layer is achieved and the contact ends of the spring lie securely on the contact area. The contact area preferably has the dimensions 20 mm by 40 mm and its layer thickness is approximately 10 to 30 micrometers, preferably 20 micrometers. Because of this great thickness, a corresponding depth in the cliché of the printing device is required; it is approximately 100 micrometers with a layer thickness of 20 micrometers.

Zur Herstellung von 100 g graphithaltiger Leitsuspension werden 28,2g 28 Gew.%ige Graphitsuspension der Fa. Acheson, 24,5g Eisenoxid (FeO₃) mit einer Korngröße von 10 bis 20 Mikrometer, das 2½ Stunden bei 640oC geglüht wurde, 8,3 g Wasserglas, vorzugsweise 30 Gew.%iges Kaliwasserglas Type 28/30 der Fa. Pebura und 39g demineralisiertes Wasser in eine Kugelmühle gegeben und 72 Stunden homogenisiert. In dieser Leitsuspension beträgt dann der Anteil an Festkörpern 35 Gew.%.To prepare 100 g of graphite-containing master suspension, 28.2 g of 28% by weight graphite suspension from Acheson, 24.5 g of iron oxide (FeO 3) with a grain size of 10 to 20 micrometers, which was annealed at 640 ° C. for 2½ hours, 8. 3 g of water glass, preferably 30% by weight potassium water glass type 28/30 from Pebura and 39 g of demineralized water are placed in a ball mill and homogenized for 72 hours. The proportion of solids in this master suspension is then 35% by weight.

Nach dem Einbringen der Phosphore in die Wanne wird die Leitsuspension auf den Innenrand der Wanne gedruckt, um die Kontaktfläche herzustellen. Anschließend wird die Phosphorschicht und die Kontaktfläche getrocknet, was beispielsweise durch die Anwendung von Heizstrahlern geschehen kann. Danach erfolgt das Aufbringen des Lackfilmes und dann das Aluminisieren der Wanne. Hieran schließen sich die weiteren üblichen Fertigungsschritte an.After the phosphors have been introduced into the tub, the conductive suspension is printed on the inner edge of the tub to produce the contact surface. The phosphor layer and the contact surface are then dried, which can be done, for example, by using radiant heaters. Then the lacquer film is applied and then the tub is aluminized. This is followed by the other usual manufacturing steps.

Claims (3)

1. Graphithaltige Leitsuspension für eine Kontaktfläche auf dem Innenrand einer Wanne einer Bildröhre,
dadurch gekennzeichnet, daß sie neben Graphit aus Eisenoxid, Wasserglas und Wasser besteht.1. graphite-containing conductive suspension for a contact surface on the inner edge of a tub of a picture tube,
characterized in that it consists of graphite, iron oxide, water glass and water. 2. Leitsuspension nach Anspruch 1, dadurch gekennzeichnet, daß der Festkörperanteil 30 bis 40 Gew.% beträgt.2. Leitsuspension according to claim 1, characterized in that the solids content is 30 to 40 wt.%. 3. Leitsuspension nach Anspruch 2, dadurch gekennzeichnet, daß der Festkörperanteil 35 Gew.% beträgt.3. Leitsuspension according to claim 2, characterized in that the solids content is 35 wt.%.
EP89122354A 1988-12-20 1989-12-04 Surface de contact composée d'une suspension de graphite Expired - Lifetime EP0374571B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842837 1988-12-20
DE3842837A DE3842837A1 (en) 1988-12-20 1988-12-20 GRAPHITE-BASED SUSPENSION

Publications (3)

Publication Number Publication Date
EP0374571A2 true EP0374571A2 (en) 1990-06-27
EP0374571A3 EP0374571A3 (en) 1991-06-12
EP0374571B1 EP0374571B1 (en) 1996-03-06

Family

ID=6369604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122354A Expired - Lifetime EP0374571B1 (en) 1988-12-20 1989-12-04 Surface de contact composée d'une suspension de graphite

Country Status (2)

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EP (1) EP0374571B1 (en)
DE (2) DE3842837A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844641A1 (en) * 1996-11-26 1998-05-27 Lg Electronics Inc. Interior coating for color CRT
NL1002804C2 (en) * 1995-04-04 1999-01-12 Hitachi Powdered Metals Coating material for an inner layer of a cathode ray tube.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0782821B2 (en) * 1990-05-21 1995-09-06 日本アチソン株式会社 Interior coating agent composition for cathode ray tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791546A (en) * 1971-11-26 1974-02-12 Rca Corp Cathode-ray tube having conductive internal coating comprised of iron oxide and graphite
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
JPS58216331A (en) * 1982-06-11 1983-12-16 Toshiba Corp Manufacture of cathode ray tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791546A (en) * 1971-11-26 1974-02-12 Rca Corp Cathode-ray tube having conductive internal coating comprised of iron oxide and graphite
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
JPS58216331A (en) * 1982-06-11 1983-12-16 Toshiba Corp Manufacture of cathode ray tube

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Funk-Technik, 1967, Nr. 16, Seiten 576 - 580 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 66 (E-234)[1503], 28. März 1984; & JP-A-58 216 331 (TOKYO-SHIBAURA) 16-12-1983 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002804C2 (en) * 1995-04-04 1999-01-12 Hitachi Powdered Metals Coating material for an inner layer of a cathode ray tube.
EP0844641A1 (en) * 1996-11-26 1998-05-27 Lg Electronics Inc. Interior coating for color CRT
CN1121461C (en) * 1996-11-26 2003-09-17 Lg电子株式会社 Interior coating for color CRT

Also Published As

Publication number Publication date
EP0374571B1 (en) 1996-03-06
DE58909618D1 (en) 1996-04-11
DE3842837A1 (en) 1990-06-21
EP0374571A3 (en) 1991-06-12

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