ES352039A1 - Method for Preparing a Stencil - Google Patents

Method for Preparing a Stencil

Info

Publication number
ES352039A1
ES352039A1 ES352039A ES352039A ES352039A1 ES 352039 A1 ES352039 A1 ES 352039A1 ES 352039 A ES352039 A ES 352039A ES 352039 A ES352039 A ES 352039A ES 352039 A1 ES352039 A1 ES 352039A1
Authority
ES
Spain
Prior art keywords
film
regions
areas
dots
screen
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
Application number
ES352039A
Other languages
Spanish (es)
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of ES352039A1 publication Critical patent/ES352039A1/en
Expired legal-status Critical Current

Links

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
    • H01J29/24—Supports for luminescent material
    • 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
    • H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

A method of producing a stencil comprises introducing into a film of material desired pattern of soluble and insoluble regions with intermediate regions progressively varying in solubility, removing the regions of greatest solubility and progressively dissolving and removing the intermediate regions until the insoluble regions are of a desired size. One application of the method is the production of a colour television screen, wherein the faceplate of the tube is coated with a film of dichromated polyvinyl alcohol and exposed to ultra-violet light through a shadow mask. This produces a dot pattern of insoluble regions, each dot being surrounded by an area of progressively more soluble material in the penumbra of the dot. The screen may now be flushed with a 3% H 2 O 2 solution which removes the unexposed areas of film and part of the partly exposed areas to leave dots of the required size. Alternatively the unexposed areas of film may be removed by water and a 7% H 2 O 2 solution applied to reduce the size of the remaining dots as the required. A film of graphite is now deposited over the whole screen after which the screen is treated with a 35% H 2 O 2 solution which dissolves the hardened polyvinyl alcohol dots leaving a pattern of graphite filling the areas which were not covered by the dots. The original dot areas are then coated with fluorescent materials and a reflective metal layer is applied over the whole screen.
ES352039A 1967-03-29 1969-04-27 Method for Preparing a Stencil Expired ES352039A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62675367A 1967-03-29 1967-03-29

Publications (1)

Publication Number Publication Date
ES352039A1 true ES352039A1 (en) 1970-05-01

Family

ID=24511705

Family Applications (1)

Application Number Title Priority Date Filing Date
ES352039A Expired ES352039A1 (en) 1967-03-29 1969-04-27 Method for Preparing a Stencil

Country Status (8)

Country Link
AT (1) AT300912B (en)
BE (1) BE713008A (en)
DE (1) DE1696285A1 (en)
ES (1) ES352039A1 (en)
FR (1) FR1563267A (en)
GB (1) GB1180194A (en)
NL (1) NL6804371A (en)
SE (1) SE330662B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523267B2 (en) * 1972-11-22 1977-01-27
GB1450196A (en) * 1972-11-25 1976-09-22 Hoechst Ag Light-sensitive preparations

Also Published As

Publication number Publication date
GB1180194A (en) 1970-02-04
FR1563267A (en) 1969-04-11
AT300912B (en) 1972-08-10
NL6804371A (en) 1968-09-30
BE713008A (en) 1968-07-31
DE1696285A1 (en) 1971-11-04
SE330662B (en) 1970-11-23

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