GB1359490A - Method of manufacturing a fluorescent screen of a colour televi sion picture tube - Google Patents

Method of manufacturing a fluorescent screen of a colour televi sion picture tube

Info

Publication number
GB1359490A
GB1359490A GB4286671A GB4286671A GB1359490A GB 1359490 A GB1359490 A GB 1359490A GB 4286671 A GB4286671 A GB 4286671A GB 4286671 A GB4286671 A GB 4286671A GB 1359490 A GB1359490 A GB 1359490A
Authority
GB
United Kingdom
Prior art keywords
spots
shrunk
shrinking
dots
colour
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
GB4286671A
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to GB4286671A priority Critical patent/GB1359490A/en
Publication of GB1359490A publication Critical patent/GB1359490A/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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
    • C08K5/57—Organo-tin compounds

Abstract

1359490 Colour television tubes HITACHI Ltd 14 Sept 1971 42866/71 Heading H1D A method of manufacturing a colour TV tube fluorescent screen in which phosphor dots are formed using a shadow mask includes applying a photosensitive coating, e.g. pva. with ammonium dichromate, on the inner faceplate surface; exposing to light through the shadow mask perforations and removing portions not exposed to light, shrinking the remaining spots to reduce their area, "shrinking" meaning shrinking of the complete spots, rather than chemical removal of their edges, waterproofing the shrunk spots, applying a non-luminous substance (e.g. graphite) over the entire inner surface, removing the shrunk spots with their non-luminous coating; and thereafter forming phosphor dots corresponding to the shrunk spots by light exposure through the perforations of the shadow mask. Shrinking may be by treating the spots, while still wet and swollen, with a suitable organic or inorganic salt, e.g. 5% by wt. ammonium sulphate or sodium acetate for about 1 minute. The spots are restored when wetted by water or an aqueous solution so are waterproofed by heating to 80‹ to 100‹ C. Preferably, 0.2% by wt. of a photosensitive bonding agent for pva., e.g. ammonium bichromate, may be incorporated in the photosensitive material, the shrunk spots being irradiated with uv. or electrons to waterproof same. Dimensions of dots and mask perforations are given. The screen is cleaned, ammonia in an aqueous solution of potassium silicate with 5% graphite to prepare solution of pH 10.4 to 10.6, is applied, immersed in hydrogen peroxide which permeates the graphite causing it to swell and embrittle the spots which peel off under a warm water jet. Dots may be Red, Green, Blue. The electron beam area equals that of original coatings 12, 13, 14, i.e. corresponding to the phosphor dots 16, 17, 18 but is larger than the effective crosssectional area of the phosphor dots as viewed from the front side.
GB4286671A 1971-09-14 1971-09-14 Method of manufacturing a fluorescent screen of a colour televi sion picture tube Expired GB1359490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4286671A GB1359490A (en) 1971-09-14 1971-09-14 Method of manufacturing a fluorescent screen of a colour televi sion picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4286671A GB1359490A (en) 1971-09-14 1971-09-14 Method of manufacturing a fluorescent screen of a colour televi sion picture tube

Publications (1)

Publication Number Publication Date
GB1359490A true GB1359490A (en) 1974-07-10

Family

ID=10426308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4286671A Expired GB1359490A (en) 1971-09-14 1971-09-14 Method of manufacturing a fluorescent screen of a colour televi sion picture tube

Country Status (1)

Country Link
GB (1) GB1359490A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397061A1 (en) * 1977-07-09 1979-02-02 Licentia Gmbh PROCESS FOR PREPARING A LUMINESCENT SCREEN FOR COLOR IMAGE CATHODIC TUBES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397061A1 (en) * 1977-07-09 1979-02-02 Licentia Gmbh PROCESS FOR PREPARING A LUMINESCENT SCREEN FOR COLOR IMAGE CATHODIC TUBES

Similar Documents

Publication Publication Date Title
GB1355308A (en) Photographic method for printing a screen structure for a cathode ray tube
US3712815A (en) Method of manufacturing a display screen
GB1328295A (en) Shadow mask cathode ray tubes
US3891440A (en) Process for fabricating a color cathode ray tube screen structure incorporating optical filter means therein
GB1359490A (en) Method of manufacturing a fluorescent screen of a colour televi sion picture tube
US3887371A (en) Photographic method for printing viewing-screen structure including treatment of exposed coating with ammonium compound
US3689266A (en) Method of manufacturing fluorescent screens of color picture tubes
JPS5335366A (en) Color picture tube
JPS61224235A (en) Manufacture of fluorescent screen of color picture tube
US3931442A (en) Temporary modification of a pattern mask for use in forming a color CRT screen and a process for modifying the same
DE2423680A1 (en) METHOD OF FORMATION OF A LIGHT-ABSORBING GRID ON A SCREEN SUBSTRATE
GB1379047A (en) Method for making a phosphor screen of a cathode ray tube
JPS60119055A (en) Manufacture of color cathode-ray tube
GB1324377A (en) Process for fabricating a screen structure for a cathode ray tube
US3706558A (en) Photographic method for printing viewing screen structure including treatment of exposed coating before development
GB1306607A (en) Methods of making colour phosphor screens of colour picture tubes
GB1455719A (en) Method for making phosphor screen for black matrix type colour cathode ray tube
RU2054731C1 (en) Method for black matrix generation on color tube screen
SU416790A1 (en)
SE330662B (en)
JPH04296346A (en) Method for modifying photosensitive material based on polyvinyl pyrrolidone
SU470014A1 (en) A method of manufacturing a light-absorbing matrix for color kinescope screens
JP2986866B2 (en) Graphite coating slurry for cathode ray tube and cathode ray tube
JPH01169835A (en) Method for forming fluorescent screen of color picture tube
GB1340225A (en) Manufacture of screens for cathode ray tubes

Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee