EP0556480B1 - Procédé pour le revêtement de grandes surfaces courbes, particulièrement d'un écran d'une tube à rayons cathodiques, par revêtement centrifuge - Google Patents

Procédé pour le revêtement de grandes surfaces courbes, particulièrement d'un écran d'une tube à rayons cathodiques, par revêtement centrifuge Download PDF

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Publication number
EP0556480B1
EP0556480B1 EP92121666A EP92121666A EP0556480B1 EP 0556480 B1 EP0556480 B1 EP 0556480B1 EP 92121666 A EP92121666 A EP 92121666A EP 92121666 A EP92121666 A EP 92121666A EP 0556480 B1 EP0556480 B1 EP 0556480B1
Authority
EP
European Patent Office
Prior art keywords
coated
disc
coating
cathode ray
ray tube
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
EP92121666A
Other languages
German (de)
English (en)
Other versions
EP0556480A1 (fr
Inventor
Nanning Dr. Arfsten
Hermann Piehlke
Reinhard Kaufmann
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.)
Schott AG
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
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 Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of EP0556480A1 publication Critical patent/EP0556480A1/fr
Application granted granted Critical
Publication of EP0556480B1 publication Critical patent/EP0556480B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B05D1/005—Spin coating
    • 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
    • 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
    • H01J9/223—Applying luminescent coatings in continuous layers by uniformly dispersing of liquid

Definitions

  • the outer surface of the screen of a picture tube is usually mirror-like and has a very high electrical resistance.
  • the bare, smooth surface often causes annoying reflections, and the high electrical resistance leads to electrostatic charging of the screen surface during operation of the tube.
  • an antistatic or anti-reflective coating by applying one or more thin layers, for which numerous methods are known. It is widespread, for example, to apply an alcoholic solution of organosilicon compounds, in particular silicon alcoholates, together with organotitanium compounds in a thin layer to adjust the refractive index, which after drying and baking form an SiO2 film that has antistatic and antireflective properties . Sometimes several layers, possibly with different refractive indices, are applied after each intermediate drying and then baked together. Excellent layers of anti-reflective effects can be created, especially with multiple layers.
  • spin coating is used in particular as a coating method for producing thin layers on large domed bodies.
  • the coating solution is applied to the object to be coated, distributed by rotating the object to be coated and any excess is thrown off at the edges.
  • the centrifugal process is simple in terms of process technology and also works very quickly, but in particular in the outer and corner areas of large-area screens, different layer thicknesses can occur, which can cause undesirable effects, for example interference.
  • the screen surface to be coated to be arranged facing downwards in an inclined drum, which has an opening facing upwards, then spraying the coating solution on the screen surface and, while rotating by means of a warm air blower, part of the liquid film formed in and around the center of the screen by targeted blowing with warm air to dry.
  • a warm air blower part of the liquid film formed in and around the center of the screen by targeted blowing with warm air to dry.
  • the object of the invention is to find a method for spin coating in which very homogeneous coatings can be achieved even with large bodies, in which only a relatively small outlay on equipment is required and in which the consumption of coating material can be kept low.
  • the generation of a particularly uniform layer thickness over the entire surface to be coated is achieved in that a disc approximately adapted to the shape of the surface to be coated with approximately the spin speed is used in the same direction during the spinning process at a distance of 1-10 mm above the surface to be coated the surface to be coated can rotate. If the distance between the pane and the surface to be coated is less than 1 mm, the outlay on equipment rises sharply due to the high precision that is then required. If the distance of the rotating disk from the surface to be coated is greater than 10 mm, inhomogeneities in the layer thickness could occur, particularly in the case of large parts to be coated. A distance of 2-4 mm for the disk is preferred. Furthermore, it is preferred if the rotating disk follows the contour of the edge at the edges of the surface to be coated, ie is drawn down about 0.5-2 cm deep at a distance of 1 to 10 mm around the edges of the object to be coated.
  • the addition of the coating solution takes place most advantageously during the rotation through a central opening in the disk rotating concentrically to the coating surface.
  • the known addition of the coating solution during the rotation has the advantage that very little coating solution is used.
  • the size of the central opening is largely uncritical, but in practice it is preferred not to let the diameter of this opening be larger than 15 cm, preferably not larger than 3 cm.
  • the smallest diameter of the feed opening is limited by the need to let the coating agent or a nozzle supplying the coating agent pass through. Of course, it is also possible to close the opening after the coating solution has been supplied.
  • the nozzle can also be firmly connected to the disk and connected to a feed system for the coating solution via a rotating seal.
  • the distance of the pane from the surface to be coated should be 1-10 mm, preferably 2-4 mm, whereby an approximately the shape of the pane to be coated is achieved. It is further preferred if, for a given average distance of the pane in the area under stress, the difference in the distance of the pane between the shortest and furthest distance from the top surface to be coated is at most 4 mm. It is further preferred if the distance of the pane from the coating surface in the outer third of the edge area is between 1 and 4, preferably 2 and 3 mm.
  • the speeds at which the disk and the surface to be coated rotate during spin coating are known per se and range from less than 300 revolutions / minute to about 1,500 revolutions. About 500-700 revolutions / minute are preferred.
  • the speed of the rotating disc should not differ significantly from the speed at which the surface to be coated rotates. It is preferred if the rotating disk and the surface to be coated run at the same speed, which is also the simplest solution to implement in terms of apparatus. However, it is also entirely possible to allow speed differences of up to about 10%.
  • Figure 1 shows a cathode ray tube 1, which is held in a holding device 2 and 2 '.
  • the screen page 3 to be coated faces upwards.
  • the disc is a short distance above the surface to be coated 4 arranged, which essentially follows the shape of the surface to be coated.
  • the disc 4 is provided with a nozzle 5, around which the disc 4 is rotatable and which at the same time forms the central opening 6 for the supply of the coating material.
  • the disc 4 is provided on its sides with a collar 7 which overlaps the outer edges of the surface 3 to be coated.
  • the picture tube 1 with the holder 2 and 2 and the disk 4 are preferably rotated synchronously about the axis 9 and the coating solution is introduced onto the surface 3 through the central opening 6 coating surface 3 completely uniform coating film.
  • FIG. 2 shows a top view of a disk 24 with a centrally arranged feed opening 26 for applying the coating solution.
  • a disc is provided, which is provided with a collar and is thus drawn 0.5 cm around the edge of the surface to be coated.
  • the disc is provided with a central opening of 0.2-1 cm in diameter for the supply of the coating agent.
  • the axes of rotation of screen 1 and disc 4 are of course concentric. Now the screen and screen are rotated in the same direction at 800 revolutions / minute and 5 ml of coating solution are added at once through the central opening.
  • the coating solution has the composition: 32 g (OCH3) 4Si (OCH3) 4, 88 ml of ethanol, 1 ml of HCL and 27 ml of H2O.
  • the disk and screen are rotated for about 10 seconds, the screen is removed from the holding device, it is dried at 150 ° C. and then the coating is baked at 400-450 ° C.
  • the layer produced on the screen surface had a thickness of 91 nm ⁇ 2 nm over the entire area.
  • the coating solution can also be dried on the screen surface if the picture tube is still clamped in the holder, for example by the pane is tilted away and the entire pane surface is blown with warm or hot air.
  • the screen can rotate or stand still. After the first layer has dried, corresponding further layers can be applied, so that a layer package is obtained which is finally baked together in one firing process. In this way, an excellent anti-reflective coating or antistatic finish can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Chemically Coating (AREA)

Claims (5)

  1. Procédé pour produire des minces couches sur des grandes surfaces courbes, en particulier des écrans de tubes à rayons cathodiques, par revêtement centrifuge, caractérisé par le fait que pendant l'opération de centrifugation, on fait tourner un disque (4) adapté à peu près à la forme de la surface à revêtir, à une distance de 1 à 10 mm au-dessus de la surface à revêtir, à peu près à la vitesse de centrifugation dans le même sens que la surface (3) à revêtir.
  2. Procédé suivant la revendication 1, caractérisé par le fait qu'on fait tourner le disque (4) à une distance de 2 à 4 mm au-dessus de la surface (3) à revêtir.
  3. Procédé suivant la revendication 1 ou 2, caractérisé par le fait qu'on fait tourner un disque (4) qui est prolongé sur une profondeur d'environ 0,5 à 2 mm à une distance de 1 à 10 mm autour des arêtes de la surface (3) à revêtir.
  4. Procédé suivant au moins l'une des revendications 1 à 3, caractérisé par le fait qu'on ajoute la solution de revêtement pendant la rotation à travers une ouverture (6) centrale du disque (4), présentant un diamètre qui n'est pas supérieur à 15 cm.
  5. Procédé suivant au moins l'une des revendications 1 à 4, caractérisé par le fait qu'on procède à l'opération de centrifugation à une vitesse de 300 à 1500 tours/minute.
EP92121666A 1992-02-15 1992-12-19 Procédé pour le revêtement de grandes surfaces courbes, particulièrement d'un écran d'une tube à rayons cathodiques, par revêtement centrifuge Expired - Lifetime EP0556480B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4204637A DE4204637C1 (fr) 1992-02-15 1992-02-15
DE4204637 1992-02-15

Publications (2)

Publication Number Publication Date
EP0556480A1 EP0556480A1 (fr) 1993-08-25
EP0556480B1 true EP0556480B1 (fr) 1994-09-14

Family

ID=6451853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121666A Expired - Lifetime EP0556480B1 (fr) 1992-02-15 1992-12-19 Procédé pour le revêtement de grandes surfaces courbes, particulièrement d'un écran d'une tube à rayons cathodiques, par revêtement centrifuge

Country Status (6)

Country Link
US (1) US5314715A (fr)
EP (1) EP0556480B1 (fr)
JP (1) JP2592034B2 (fr)
AT (1) ATE111634T1 (fr)
DE (2) DE4204637C1 (fr)
ES (1) ES2060445T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545573A1 (de) * 1995-12-07 1997-06-12 Leybold Ag Vorrichtung zum gleichmäßigen Aufbringen einer Lackschicht auf ein Substrat

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824955A (en) * 1972-05-15 1974-07-23 A Marks Apparatus for coating television viewing tubes
JP2653429B2 (ja) * 1986-10-16 1997-09-17 株式会社東芝 陰極線管用バルブホルダー
JP2695823B2 (ja) * 1987-04-10 1998-01-14 株式会社東芝 陰極線管の表示面外表面に薄膜を形成する方法
JPH0654634B2 (ja) * 1988-02-08 1994-07-20 株式会社東芝 塗布装置
JPH07109747B2 (ja) * 1988-06-30 1995-11-22 旭硝子株式会社 グラウン管用パネルフェースの表面処理装置
FR2636546B1 (fr) * 1988-09-15 1991-03-15 Sulzer Electro Tech Procede et dispositif pour l'application uniformement reguliere d'une couche de resine sur un substrat
JPH0294335A (ja) * 1988-09-30 1990-04-05 Mitsubishi Electric Corp 帯電防止処理型陰極線管の製造方法
JPH02195629A (ja) * 1989-01-25 1990-08-02 Hitachi Ltd 陰極線管パネル面処理液の回転塗布方法
JP2760551B2 (ja) * 1989-03-15 1998-06-04 株式会社東芝 陰極線管のフェース外表面に薄膜を形成する方法
JPH03152827A (ja) * 1989-11-08 1991-06-28 Toshiba Corp 陰極線管のフェース外表面に薄膜を形成する方法
JPH0675367B2 (ja) * 1989-12-05 1994-09-21 旭硝子株式会社 ブラウン管用パネルフェースの表面処理方法及びその装置

Also Published As

Publication number Publication date
ES2060445T3 (es) 1994-11-16
JP2592034B2 (ja) 1997-03-19
EP0556480A1 (fr) 1993-08-25
DE4204637C1 (fr) 1993-03-11
US5314715A (en) 1994-05-24
JPH0612981A (ja) 1994-01-21
ATE111634T1 (de) 1994-09-15
DE59200507D1 (de) 1994-10-20

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