EP0485718B1 - Procédé de vernissage d'une couche luminescente sur un tube cathodique en couleurs - Google Patents

Procédé de vernissage d'une couche luminescente sur un tube cathodique en couleurs Download PDF

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Publication number
EP0485718B1
EP0485718B1 EP91116084A EP91116084A EP0485718B1 EP 0485718 B1 EP0485718 B1 EP 0485718B1 EP 91116084 A EP91116084 A EP 91116084A EP 91116084 A EP91116084 A EP 91116084A EP 0485718 B1 EP0485718 B1 EP 0485718B1
Authority
EP
European Patent Office
Prior art keywords
dispersion
lacquer
film
phosphor layer
lacquering
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.)
Expired - Lifetime
Application number
EP91116084A
Other languages
German (de)
English (en)
Other versions
EP0485718A2 (fr
EP0485718A3 (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 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 Deutschland GmbH filed Critical Nokia Deutschland GmbH
Publication of EP0485718A2 publication Critical patent/EP0485718A2/fr
Publication of EP0485718A3 publication Critical patent/EP0485718A3/de
Application granted granted Critical
Publication of EP0485718B1 publication Critical patent/EP0485718B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • H01J29/28—Luminescent screens with protective, conductive or reflective layers

Definitions

  • the invention relates to a method for painting the phosphor layer on the screen trough of a color picture tube.
  • An aqueous dispersion of a varnish is usually used to varnish the phosphor layer on the screen trough of a color picture tube.
  • varnishes examples are e.g. B. in US-A-3,317,337 and DE-A-30 46 373 (US-A-4,409,352).
  • the one such as For example, as described in US-A-3,317,337, is to pour dispersion into the screen pan with the phosphor layer upward, then to set the screen pan in rapid rotation to distribute the dispersion, and finally to incline the screen pan so that excess Dispersion can run off.
  • a second known application method is that the dispersion is sprayed from below against the vertically standing or obliquely downward rotating phosphor layer and that after the spraying the screen trough is set in rapid rotation in order to distribute the dispersion over the phosphor layer and at the same time to throw off excess dispersion.
  • the dispersion After the dispersion has been uniformly distributed over the phosphor layer, the dispersion is dried completely and heated to above the film-forming temperature of the lacquer in order to produce a lacquer film. Then, what is no longer part of the process of painting the phosphor layer, the paint is evaporated with aluminum, whereupon the paint is evaporated, so that only an aluminum film remains as a reflective layer behind the phosphor layer.
  • the first dispersion has either about 3 or about 6% of a copolymer of n-butyl methacrylate and metacrylic acid, and the second dispersion contains about 15% of an acrylic resin.
  • another method is used, e.g. B.
  • the phosphor layer was prewetting. This was done as described in EP-B-149 838.
  • Fig. 3 illustrates the improvement in brightness that occurred compared to the conventional painting method of DE-A-30 46 373.
  • the dashed line shows the relationship between the paint solids content in the paint dispersion and the beam current of a color picture tube to achieve a predetermined brightness, as it applies when a single coat is carried out.
  • the solids content was varied between 8 and 18%.
  • the beam current required to achieve the specified brightness hardly changes when the solid content is between 12 and 18%.
  • This jet current is given as a percentage with the value 100%. If the solid content is reduced, a larger beam current is required to achieve the specified brightness. This is because in these cases the aluminum film applied to the lacquer layer experiences disturbances due to the penetrating phosphor layer. If the paint solids content in the dispersion is increased by more than 18%, the aluminum film is also disturbed, however, no longer because the phosphor layer reaches through, but because bubbles occur when the paint layer evaporates through the aluminum layer.
  • the solid line shows the corresponding relationship for the method explained with reference to FIGS. 1 and 2.
  • the solids content is the sum of the solids content of the two dispersions. Since both dispersions have 8.5% solids in the exemplary embodiment, the total value in FIG. 3 is 17%. It can be seen that in the case of total values between approximately 16 and 20%, significantly reduced beam currents are required in order to achieve the predetermined brightness, namely only approximately 90% compared to the previously achievable optimal value set to 100%. For a given beam current in actual operation, the brightness is accordingly about 10% higher than was previously achievable.
  • the painting result is slightly better if the concentration of the constituents in the second dispersion is somewhat higher than the concentration of the constituents in the first dispersion.
  • the improvement hardly affects the brightness, but rather the visual impression of the edge areas of the screen trough when the tube is not operated.
  • the first dispersion must not have too low a concentration.
  • the solids content in the first dispersion should not be less than 2%. Good results were obtained with 6.5% polyacrylate in the first dispersion and 9.5% polyacrylate in the second dispersion.
  • the dispersions were prepared again, as described in DE-A-30 46 373, only with a higher proportion of demineralized water.
  • the second dispersion was initially prepared as a basic batch, from which the first dispersion was then obtained by further dilution.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (4)

  1. Procédé de vernissage de la couche de produit luminescent placée sur la cuvette-écran d'un tube de télévision en couleur, dans le cas duquel
    - on applique une première dispersion aqueuse d'un vernis sur la couche de produit luminescent,
    - on fait sécher entièrement la première dispersion et on la fait chauffer jusqu'au-delà de la température de formation de film de vernis pour produire un premier film de vernis,
    - on applique une seconde dispersion aqueuse d'un vernis sur le film de vernis,
    - et on fait sécher entièrement cette deuxième dispersion et on la fait chauffer jusqu'au-delà de la température de formation de film de vernis pour produire un second film de vernis,
    caractérisé par le fait que
    - pour les deux dispersions on emploie des composants identiques, la concentration des composants dans la seconde dispersion correspondant au moins pour l'essentiel à la concentration des composants dans la première dispersion,
    - et qu'avant d'appliquer la première dispersion aqueuse, on pré-humecte la couche de produit luminescent, tandis que par contre on applique la seconde dispersion aqueuse immédiatement sur le premier film de vernis.
  2. Procédé selon la revendication 1, caractérisé par le fait que l'on pulvérise au moins la seconde dispersion d'en bas, en direction de la couche de produit luminescent mis en rotation, orientée verticalement ou obliquement vers le bas, et qu'après cette pulvérisation, on entraine la cuvette-écran en rotation rapide pour répartir la dispersion en couche mince sur le premier film.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé par le fait que pour fabriquer les deux films de vernis on emploie la même dispersion.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que l'on applique d'autres films de vernis de façon correspondante à la seconde.
EP91116084A 1990-11-14 1991-09-21 Procédé de vernissage d'une couche luminescente sur un tube cathodique en couleurs Expired - Lifetime EP0485718B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4036239A DE4036239A1 (de) 1990-11-14 1990-11-14 Verfahren zum lackieren der leuchtstoffschicht einer farbbildroehre
DE4036239 1990-11-14

Publications (3)

Publication Number Publication Date
EP0485718A2 EP0485718A2 (fr) 1992-05-20
EP0485718A3 EP0485718A3 (en) 1993-02-03
EP0485718B1 true EP0485718B1 (fr) 1994-06-08

Family

ID=6418236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91116084A Expired - Lifetime EP0485718B1 (fr) 1990-11-14 1991-09-21 Procédé de vernissage d'une couche luminescente sur un tube cathodique en couleurs

Country Status (6)

Country Link
US (1) US5334410A (fr)
EP (1) EP0485718B1 (fr)
JP (1) JP3025079B2 (fr)
AT (1) ATE107080T1 (fr)
DE (2) DE4036239A1 (fr)
ES (1) ES2057699T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH097517A (ja) * 1995-06-21 1997-01-10 Sony Corp 陰極線管の製造方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1130939B (de) * 1959-05-06 1962-06-07 Philips Nv Verfahren zur Herstellung einer Elektronenstrahlroehre mit einem Leuchtschirm
US3317337A (en) * 1963-03-18 1967-05-02 Rca Corp Method of metallizing luminescent screens
US3463686A (en) * 1965-09-08 1969-08-26 Sylvania Electric Prod Cathodoluminescent screens and fabrication thereof
US3652323A (en) * 1969-12-22 1972-03-28 Rca Corp Process for coating flatlike surfaces
DE2329741A1 (de) * 1973-06-12 1975-01-09 Standard Elektrik Lorenz Ag Verfahren zum aufbringen einer lackschicht auf die innenseite der schirmwanne einer fernsehbildroehre
DE2450834C3 (de) * 1974-10-25 1984-06-28 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zum Aluminisieren der Innenseite der Schirmwanne einer Fernsehbildröhre
JPS5223258A (en) * 1975-08-15 1977-02-22 Toshiba Corp Method of manufacturing cathode-ray tube fluorescent surface
JPS52134370A (en) * 1976-05-06 1977-11-10 Hitachi Ltd Manufacture for brown tubes
JPS52135663A (en) * 1976-05-10 1977-11-12 Hitachi Ltd Manufacture for brown tube
JPS5355954A (en) * 1976-11-01 1978-05-20 Toshiba Corp Manufacture of fluorescent screen for color
US4196015A (en) * 1978-08-18 1980-04-01 Zenith Radio Corporation Rewetting solution and method for aluminizing image display faceplates
DE3046373C2 (de) * 1980-12-09 1983-12-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Herstellung eines Dispersionslackes für Leuchtschirme
JPS6074231A (ja) * 1983-09-30 1985-04-26 Hitachi Ltd 陰極線管の製造方法
DE3534188A1 (de) * 1985-09-25 1987-03-26 Siemens Ag Verfahren zum aufbringen einer aluminium-hinterlegung auf den leuchtschirm einer flachen bildanzeigevorrichtung
JPH0227636A (ja) * 1988-07-15 1990-01-30 Sony Corp 受像管螢光面の形成方法

Also Published As

Publication number Publication date
JPH04284330A (ja) 1992-10-08
JP3025079B2 (ja) 2000-03-27
DE4036239A1 (de) 1992-05-21
DE59101862D1 (de) 1994-07-14
ATE107080T1 (de) 1994-06-15
ES2057699T3 (es) 1994-10-16
US5334410A (en) 1994-08-02
EP0485718A2 (fr) 1992-05-20
EP0485718A3 (en) 1993-02-03

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