GB499266A - Improved cathode ray tubes and method of manufacturing such tubes - Google Patents

Improved cathode ray tubes and method of manufacturing such tubes

Info

Publication number
GB499266A
GB499266A GB16761/38A GB1676138A GB499266A GB 499266 A GB499266 A GB 499266A GB 16761/38 A GB16761/38 A GB 16761/38A GB 1676138 A GB1676138 A GB 1676138A GB 499266 A GB499266 A GB 499266A
Authority
GB
United Kingdom
Prior art keywords
caesium
tubes
tube
nitro
june
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
GB16761/38A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB499266A publication Critical patent/GB499266A/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
    • H01J29/28—Luminescent screens with protective, conductive or reflective layers

Landscapes

  • Luminescent Compositions (AREA)

Abstract

499,266. Electrode materials. NAAM. LOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. June 3, 1938, No. 16761. Convention date, June 7, 1937. [Class 39 (i)] [Also in Group XX] A cathode-ray tube has a fluorescent screen provided with an adsorbed layer of caesium oxide which emits secondary electrons to prevent a negative charge from the primary electrons accumulating on the screen. The fluorescent substance may be zinc silicate provided with a binder such as nitro-cellulose. The nitro-cellulose is subsequently burnt away and the zinc silicate gently sintered. The caesium oxide may be obtained from capsules inside the tube, one containing caesium or a mixture of caesium chromate and zirconium for producing caesium, and the other containing a compound, such as manganese dioxide, which evolves oxygen at a temperature exceeding the pumping temperature of the tube. The cathode is preferably activated after removal of free oxygen to prevent it being attacked thereby.
GB16761/38A 1937-06-07 1938-06-03 Improved cathode ray tubes and method of manufacturing such tubes Expired GB499266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE499266X 1937-06-07

Publications (1)

Publication Number Publication Date
GB499266A true GB499266A (en) 1939-01-20

Family

ID=6545435

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16761/38A Expired GB499266A (en) 1937-06-07 1938-06-03 Improved cathode ray tubes and method of manufacturing such tubes

Country Status (1)

Country Link
GB (1) GB499266A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469873A (en) * 1945-04-16 1949-05-10 Frederick I Ernest Precision expanding adapter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469873A (en) * 1945-04-16 1949-05-10 Frederick I Ernest Precision expanding adapter

Similar Documents

Publication Publication Date Title
US2181305A (en) Fluorescent lamp
GB499570A (en) Improvements in and relating to electrodes for electric discharge devices and methodof making the same
GB648955A (en) Improvements in electron-emitting electrodes for electric discharge tubes
GB572771A (en) Improvements in the production of fluorescent materials
GB782287A (en) Improvements in or relating to electron emissive coatings
GB499266A (en) Improved cathode ray tubes and method of manufacturing such tubes
US2840751A (en) Electrode coating composition and electrode for cold cathode gas discharge lamp
GB484548A (en) Improvements in incandescent electrodes for electric discharge tubes
GB498792A (en) Improved method of making an electric discharge tube comprising a secondary-emission electrode
GB496556A (en) Improvements in electrodes for electron discharge devices
US2206372A (en) Method of manufacturing secondary emitting electrodes
GB449230A (en) Improvements in or relating to electrodes having photo-electric emission properties
GB475772A (en) Improvements in electric discharge tubes
US2208692A (en) Active metal compound for vacuum tubes
US2710262A (en) Method of forming a phosphor screen
GB498914A (en) Improved electric discharge tube comprising a fluorescent screen
US2921863A (en) Settling of luminescent screens
GB405466A (en)
GB492025A (en) Improved method of manufacturing secondary-emission electrodes
GB495551A (en) Improvements in or relating to electric gas-discharge tubes
GB495632A (en) Improvements in or relating to electric high-pressure metal-vapour discharge tubes
GB362838A (en) Improvements in or relating to photo-electric cells
GB637385A (en) Improved process of manufacturing cathodes for electric discharge tubes
GB482022A (en) Improved method of introducing an alkali or alkaline earth metal into an exhausted receptacle
GB442411A (en) Improvements in bulbs for oscillograph tubes such as braun tubes