GB1300480A - Method of producing a fluorescent screen for a colour picture tube - Google Patents

Method of producing a fluorescent screen for a colour picture tube

Info

Publication number
GB1300480A
GB1300480A GB4910970A GB4910970A GB1300480A GB 1300480 A GB1300480 A GB 1300480A GB 4910970 A GB4910970 A GB 4910970A GB 4910970 A GB4910970 A GB 4910970A GB 1300480 A GB1300480 A GB 1300480A
Authority
GB
United Kingdom
Prior art keywords
dots
screen
shadow mask
electric field
mask
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
GB4910970A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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
Priority claimed from DE19691952082 external-priority patent/DE1952082C3/en
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1300480A publication Critical patent/GB1300480A/en
Expired 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
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2275—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines including the exposition of a substance responsive to a particular radiation
    • 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)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

1300480 Luminescent screens LICENTIA PATENT - VERWALTUNGS - GmbH 15 Oct 1970 [16 Oct 1969 29 April 1970] 49109/70 Heading H1D In the manufacture of a multi-dot colour television screen by irradiating a sensitive layer through a shadow mask by means of electrons, the dots are made smaller than the corresponding apertures in the shadow mask by applying an electric field between the screen and the shadow mask during the irradiation step. This step may be part of the process of forming the phosphor dots themselves; alternatively it may be part of the process of forming an opaque layer with apertures in which the phosphor dots may be deposited by known methods, the effective size of the dots in this case being determinized by the size of the apertures in the opaque layer. The electric field causes the electrons exposing the dots near the edges of the screen to be displaced towards the centre. This can be corrected by a suitable magnetic field or by moving the centre of deflection forwards, e.g. by moving the deflection coils. Alternatively the shadow mask may be displaced towards the electron gun, and if the mask is supported by bimetallic elements for temperature-compensation purposes such displacement may be effected by cooling the bimetallic elements. Instead of correcting the positions of the dots in these ways the completed tube may be operated with an electric field between the mask and the screen.
GB4910970A 1969-10-16 1970-10-15 Method of producing a fluorescent screen for a colour picture tube Expired GB1300480A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19691952082 DE1952082C3 (en) 1969-10-16 1969-10-16 Method for producing a fluorescent screen for a shadow mask color picture tube
DE19702021051 DE2021051C3 (en) 1969-10-16 1970-04-29 Process for the production of a fluorescent screen of a color picture tube comprising a plurality of discrete fluorescent elements

Publications (1)

Publication Number Publication Date
GB1300480A true GB1300480A (en) 1972-12-20

Family

ID=25758014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4910970A Expired GB1300480A (en) 1969-10-16 1970-10-15 Method of producing a fluorescent screen for a colour picture tube

Country Status (6)

Country Link
AT (1) AT307519B (en)
DE (1) DE2021051C3 (en)
DK (1) DK136168B (en)
FR (1) FR2066038A5 (en)
GB (1) GB1300480A (en)
SE (1) SE362163B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176647A (en) * 1985-03-26 1986-12-31 Rank Electronic Tubes Ltd Manufacture of colour CRT phosphor screens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020809A1 (en) * 1980-06-02 1981-12-10 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München METHOD FOR PRODUCING AN ELECTRON BEAM LEFT WINDOW

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176647A (en) * 1985-03-26 1986-12-31 Rank Electronic Tubes Ltd Manufacture of colour CRT phosphor screens
GB2176647B (en) * 1985-03-26 1989-06-21 Rank Electronic Tubes Ltd Colour cathode ray tube

Also Published As

Publication number Publication date
FR2066038A5 (en) 1971-08-06
DE2021051A1 (en) 1971-11-11
DK136168B (en) 1977-08-22
DE2021051C3 (en) 1979-03-29
DK136168C (en) 1978-01-30
DE2021051B2 (en) 1978-07-20
AT307519B (en) 1973-05-25
SE362163B (en) 1973-11-26

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee