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GB1065149A - Improvements in or relating to the production of screens for colour cathode ray tubes - Google Patents

Improvements in or relating to the production of screens for colour cathode ray tubes

Info

Publication number
GB1065149A
GB1065149A GB52571/64A GB5257164A GB1065149A GB 1065149 A GB1065149 A GB 1065149A GB 52571/64 A GB52571/64 A GB 52571/64A GB 5257164 A GB5257164 A GB 5257164A GB 1065149 A GB1065149 A GB 1065149A
Authority
GB
United Kingdom
Prior art keywords
screen
attenuation
centre
mask
light intensity
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
GB52571/64A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB1065149A publication Critical patent/GB1065149A/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
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses
    • 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)

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

1,065,149. Colour television tubes. SYLVANIA ELECTRIC PRODUCTS Inc. Dec. 28, 1964 [Dec. 27, 1963], No. 52571/64. Heading H1D. In a photo-resist method of forming the phosphor screen of a colour cathode-ray tube of the shadow-mask type, wherein phosphor dots are formed by exposing the screen to light from a point source passing through a refractive medium and through the shadow mask, a movable blade is provided between the light source and mask and is so shaped and moved as to provide time-varying attenuation of the light reaching the screen, the attenuation decreasing from the centre of the screen towards its periphery, to compensate for greater light intensity at the centre, larger holes in the centre of the shadow mask and greater light intensity attenuation at the edge of the refractive medium. A known practice of providing a variable density filter coating on the lens for light intensity attenuation is referred to. The movable blade 58, which may be foraminated, may be of generally cardioidal shape, see also Figs. 7 and 8 (not shown), and is mounted in a ring 69 which is both rotated and laterally oscillated by an eccentric drive wheel 83 engaging in a circumferential groove in ring 69, opposite spring- loaded idler wheels 99, 101.
GB52571/64A 1963-12-27 1964-12-28 Improvements in or relating to the production of screens for colour cathode ray tubes Expired GB1065149A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US333914A US3259038A (en) 1963-12-27 1963-12-27 Light attenuator

Publications (1)

Publication Number Publication Date
GB1065149A true GB1065149A (en) 1967-04-12

Family

ID=23304784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB52571/64A Expired GB1065149A (en) 1963-12-27 1964-12-28 Improvements in or relating to the production of screens for colour cathode ray tubes

Country Status (2)

Country Link
US (1) US3259038A (en)
GB (1) GB1065149A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227361A (en) * 1988-12-23 1990-07-25 Samsung Electronic Devices "Manufacture of colour cathode ray tube screens"
US5010464A (en) * 1988-12-23 1991-04-23 Samsung Electron Devices Co., Ltd. ARC length changing apparatus is exposing device and method thereof

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380354A (en) * 1965-12-10 1968-04-30 Nat Video Corp Light source for shadow mask tubes
US3452657A (en) * 1966-07-18 1969-07-01 William J G Cox Multiple pin-hole camera
US3499372A (en) * 1967-09-05 1970-03-10 Sylvania Electric Prod Cathode ray tube screen exposure
DE1762175B1 (en) * 1968-04-24 1972-03-23 Philco Ford Corp METHOD OF MANUFACTURING A SCREEN
US3760698A (en) * 1970-10-17 1973-09-25 Mitsubishi Electric Corp Light exposure apparatus for forming fluorescent screens of color picture tubes
JPS5546020B1 (en) * 1971-06-18 1980-11-20
US3841875A (en) * 1972-04-28 1974-10-15 Zenith Radio Corp Method for grading the screen of a color tube
US3762284A (en) * 1972-04-28 1973-10-02 Zenith Radio Corp Method and apparatus for grading the screen of a black surround color tube
US3922689A (en) * 1972-05-01 1975-11-25 Zenith Radio Corp Optical system for a lighthouse enclosure
US4256390A (en) * 1980-03-20 1981-03-17 Gte Products Corporation Cathode ray tube screen exposure system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717545A (en) * 1951-08-27 1955-09-13 Engeler Walter Illuminating device
US2942099A (en) * 1958-04-11 1960-06-21 Rca Corp Optical projection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227361A (en) * 1988-12-23 1990-07-25 Samsung Electronic Devices "Manufacture of colour cathode ray tube screens"
US5010464A (en) * 1988-12-23 1991-04-23 Samsung Electron Devices Co., Ltd. ARC length changing apparatus is exposing device and method thereof
GB2227361B (en) * 1988-12-23 1993-11-17 Samsung Electronic Devices Arc length changing apparatus in exposing device and method thereof

Also Published As

Publication number Publication date
US3259038A (en) 1966-07-05

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