EP0175520A2 - Verfahren zur Herstellung fluoreszenter Oberflächen in Farbkathodenstrahlröhren des Indexstrahlentyps - Google Patents

Verfahren zur Herstellung fluoreszenter Oberflächen in Farbkathodenstrahlröhren des Indexstrahlentyps Download PDF

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Publication number
EP0175520A2
EP0175520A2 EP85306303A EP85306303A EP0175520A2 EP 0175520 A2 EP0175520 A2 EP 0175520A2 EP 85306303 A EP85306303 A EP 85306303A EP 85306303 A EP85306303 A EP 85306303A EP 0175520 A2 EP0175520 A2 EP 0175520A2
Authority
EP
European Patent Office
Prior art keywords
fluorescent
layer
index
metal backing
photosensitive resin
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
EP85306303A
Other languages
English (en)
French (fr)
Other versions
EP0175520A3 (en
EP0175520B1 (de
Inventor
Hiroshi C/O Patents Division Kato
Reiko C/O Patents Division Saito
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of EP0175520A2 publication Critical patent/EP0175520A2/de
Publication of EP0175520A3 publication Critical patent/EP0175520A3/en
Application granted granted Critical
Publication of EP0175520B1 publication Critical patent/EP0175520B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • H01J29/327—Black matrix materials
    • 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
    • H01J29/34—Luminescent screens provided with permanent marks or references
    • 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

Definitions

  • This invention relates to methods of making fluorescent surfaces in beam index type colour cathode ray tubes, and to beam index type colour CRTs having a fluorescent surface so made.
  • the fluorescent surface of a beam index type colour CRT generally has a cross-section as, for example, shown in Figure 2 of the accompanying drawings.
  • a face plate 1 is made of a flat glass plate and black matrixes b are formed thereon, with a respective fluorescent stripe R, G or B for red, green and blue successively formed between each adjacent pair of the black matrixes b.
  • a metal backing layer 2 made, for example, of aluminium film is formed on the colour fluorescent stripes R, G and B, and index fluorescent stripes ID are further formed thereover.
  • a funnel portion 3 of the CRT is sealed with frit 4 to the periphery of the face plate 1.
  • optical output signals obtained by scanning the index fluorescent stripes ID by the electron beam are detected, for example, by a photo-receiving element disposed in the funnel portion, to produce index signals, by which the positions for the three primary colour fluorescent stripes R, G and B are forecast to effect colour synchronization.
  • the fluorescent surface of the beam index colour CRT of this kind has usually been manufactured as follows. As shown in Figure 3A, as in the manner for the conventional fluorescent surface of a shadow mask type colour CRT, the black matrixes b, the colour fluorescent stripes R, G and B, an organic base layer 5 made for example of an acrylic resin, and a metal backing layer 2 made of aluminium by vacuum deposition, are formed. Thereafter a suspension of the index fluorescent material including a photosensitive agent such as polyvinyl alcohol (PVA) and ammonium dichromatic (ADC) is centrifugally-coated over the metal backing layer 2 and dried to form a photosensitive fluorescent resin layer 6.
  • PVA polyvinyl alcohol
  • ADC ammonium dichromatic
  • the portions to be formed with the index fluorescent stripes ID are exposed to, for example, ultraviolet rays 8 by way of a photomask 7 to cure the exposed portions, and are then developed with water to obtain the index fluorescent stripes ID as shown in Figure 3C.
  • a method of making a fluorescent surface in a beam index type colour cathode ray tube having fluorescent colour elements secured to a face plate and a metal backing layer covering said elements characterised by:
  • the index fluorescent material is kept from direct contact with the metal backing layer due to the presence of the photosensitive resin layer, and the unwanted portions of the index fluorescent layer can be washed away together with the uncured portion of the previously coated photosensitive resin layer following exposure and development. Accordingly, deposition of the fluorescent material on the uncovered portion can be avoided.
  • FIG. 1A there are first formed black matrixes b, colour fluorescent stripes R, G and B, an organic base layer 5 for example of an acrylic resin, and a metal backing layer 2 of aluminium by successive vacuum deposition on a face plate 1.
  • a photosensitive material such as of polyvinyl alcohol (PVA) and ammonium dichromate (ADC) is coated thereover by using a printing process and dried to form a photosensitive resin layer 10 of, for example, about 0.5 to 1 J lm thickness.
  • PVA polyvinyl alcohol
  • ADC ammonium dichromate
  • a suspension containing index fluorescent material is coated on the photosensitive resin layer 10 by a printing process, so as not to damage the photosensitive resin layer 10, and dried, thereby to form an index fluorescent layer 11 of, for example, about 10 ⁇ m thickness, on the photosensitive resin layer 10.
  • the portion of the photosensitive resin layer 10 to be formed with index fluorescent stripes 1D is exposed to irradiation by, for example, ultraviolet rays 8 through a photomask 7 so as to be cured.
  • the photosensitive resin layer 10 is immediately developed in water and the uncured portions of the photosensitive resin layer 10 are washed away together with the corresponding portions of the index fluorescent layer 11, to obtain the index fluorescent stripes ID as shown in Figure 1D.
  • index fluorescent material 11 is kept from direct contact with the metal backing layer 2 by the presence of the photosensitive resin layer 10 and, moreover, since the unwanted portions of the index fluorescent layer 11 are washed away along with the uncured portion of the photosensitive resin layer 10, unwanted deposition of the fluorescent material can be avoided. In this way, clearly defined or delineated, index fluorescent stripes ID, and thus satisfactory index signals, can be obtained. It is also unnecessary in this method to increase the developing time, or the hydrostatic pressure during the development, so damage to the metal backing layer 2 can be avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP19850306303 1984-09-07 1985-09-05 Verfahren zur Herstellung fluoreszenter Oberflächen in Farbkathodenstrahlröhren des Indexstrahlentyps Expired EP0175520B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18736784A JPS6166335A (ja) 1984-09-07 1984-09-07 ビ−ムインデツクス方式カラ−受像管の螢光面製造方法
JP187367/84 1984-09-07

Publications (3)

Publication Number Publication Date
EP0175520A2 true EP0175520A2 (de) 1986-03-26
EP0175520A3 EP0175520A3 (en) 1988-01-13
EP0175520B1 EP0175520B1 (de) 1990-01-10

Family

ID=16204754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850306303 Expired EP0175520B1 (de) 1984-09-07 1985-09-05 Verfahren zur Herstellung fluoreszenter Oberflächen in Farbkathodenstrahlröhren des Indexstrahlentyps

Country Status (3)

Country Link
EP (1) EP0175520B1 (de)
JP (1) JPS6166335A (de)
DE (1) DE3575360D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647234A1 (fr) * 1989-05-19 1990-11-23 Thomson Tubes Electroniques Procede de photolithographie de motifs repetitifs sur une grande surface
US5387948A (en) * 1993-05-03 1995-02-07 North American Philips Corporation Method and apparatus for reducing scattered light in projection television tubes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922338B2 (ja) * 1975-06-16 1984-05-25 株式会社東芝 ビ−ムインデツクス方式カラ−受像管の螢光面製造方法
JPS59187367A (ja) * 1983-04-08 1984-10-24 Fuji Xerox Co Ltd コロナ放電電流調整装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647234A1 (fr) * 1989-05-19 1990-11-23 Thomson Tubes Electroniques Procede de photolithographie de motifs repetitifs sur une grande surface
US5387948A (en) * 1993-05-03 1995-02-07 North American Philips Corporation Method and apparatus for reducing scattered light in projection television tubes

Also Published As

Publication number Publication date
EP0175520A3 (en) 1988-01-13
EP0175520B1 (de) 1990-01-10
JPS6166335A (ja) 1986-04-05
DE3575360D1 (de) 1990-02-15

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