GB823900A - Improvements in or relating to methods and apparatus for applying electron-emissive coatings to cathode cores of indirectly heated thermionic cathodes - Google Patents

Improvements in or relating to methods and apparatus for applying electron-emissive coatings to cathode cores of indirectly heated thermionic cathodes

Info

Publication number
GB823900A
GB823900A GB3505957A GB3505957A GB823900A GB 823900 A GB823900 A GB 823900A GB 3505957 A GB3505957 A GB 3505957A GB 3505957 A GB3505957 A GB 3505957A GB 823900 A GB823900 A GB 823900A
Authority
GB
United Kingdom
Prior art keywords
cathode
coating
roller
indirectly heated
relating
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
GB3505957A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB823900A publication Critical patent/GB823900A/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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/06—Machines therefor

Abstract

<PICT:0823900/III/1> An indirectly heated cathode core 4 is coated with emissive material conveyed to it by rotating it against a coated roller 12 which passes through a reservoir 2 of the coating substance; the coating process is terminated by blowing a stream of air through a duct 5, which strips the coating from the roller, thus avoiding the formation of a "seam" on the cathode coating. The roller 12 rotates in an opposite sense to that of the cathode core, and at a greater peripheral speed. The coating paste which may be, e.g. a suspension of an alkaline earth carbonate mixture in a solution of nitrocellulose, is continuously circulated through a system 9, 8, 6 to maintain a constant concentration. The cathode coating is also effected cataphoretically by applying a suitable potential difference between roller and cathode.
GB3505957A 1956-11-14 1957-11-11 Improvements in or relating to methods and apparatus for applying electron-emissive coatings to cathode cores of indirectly heated thermionic cathodes Expired GB823900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP17388A DE1053673B (en) 1956-11-14 1956-11-14 Method for applying the emission layer to the layer support of indirectly heated glow cathodes of electrical discharge tubes and device for carrying out the method

Publications (1)

Publication Number Publication Date
GB823900A true GB823900A (en) 1959-11-18

Family

ID=7366513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3505957A Expired GB823900A (en) 1956-11-14 1957-11-11 Improvements in or relating to methods and apparatus for applying electron-emissive coatings to cathode cores of indirectly heated thermionic cathodes

Country Status (6)

Country Link
BE (1) BE562310A (en)
CH (1) CH360441A (en)
DE (1) DE1053673B (en)
FR (1) FR1185981A (en)
GB (1) GB823900A (en)
NL (1) NL99689C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010128A1 (en) * 1978-08-31 1980-04-30 Siemens Aktiengesellschaft Directly heated cathode for an electron tube with coaxial electrode structure and method of making such a cathode

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1090333B (en) * 1959-04-06 1960-10-06 Siemens Ag Process for applying emission paste to tubular cathode shells of indirectly heated cathodes and device for carrying out the process
US3157588A (en) * 1960-12-14 1964-11-17 Sylvania Electric Prod Electrophoretic coating apparatus
US3219571A (en) * 1961-03-14 1965-11-23 Sylvania Electric Prod Electrophoretic coating apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE887547C (en) * 1943-01-08 1953-08-24 Telefunken Gmbh Method and device for applying emission paste to tubular emission layer carriers of indirectly heated glow cathodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010128A1 (en) * 1978-08-31 1980-04-30 Siemens Aktiengesellschaft Directly heated cathode for an electron tube with coaxial electrode structure and method of making such a cathode

Also Published As

Publication number Publication date
DE1053673B (en) 1959-03-26
NL99689C (en) 1900-01-01
CH360441A (en) 1962-02-28
BE562310A (en)
FR1185981A (en) 1959-08-11

Similar Documents

Publication Publication Date Title
GB787926A (en) Application of strip coating to cathodes
GB823900A (en) Improvements in or relating to methods and apparatus for applying electron-emissive coatings to cathode cores of indirectly heated thermionic cathodes
GB747453A (en) Improvements in or relating to method and apparatus for coating filaments of glass
JPS5596536A (en) Fluorescent face forming method
GB932868A (en) Aperture record card system
ES476752A1 (en) Method of producing luminescent screens, luminescent screens produced by this method and cathode-ray tubes including such luminescent screens.
GB1284477A (en) Electrophotographic process
GB748175A (en) Improvements in or relating to apparatus for agitating a suspension
GB749429A (en) Improvements in the manufacture of electron emissive cathodes
GB924831A (en) A method of coating cathode carriers with emission material
CA521019A (en) Method and apparatus for applying electron emission material
AT202234B (en) Method and device for applying an emission layer to the substrate of indirectly heated hot cathodes of electrical discharge tubes
GB1505948A (en) Process for producing a pressure-sensitive copying paper
GB796761A (en) Improvements in or relating to the manufacture of cathode ray tubes
AU205036B2 (en) Electron emissive coating material and method of application
GB913505A (en) Improvements in or relating to apparatus for the manufacture of coils from a wire ofsynthetic plastic
GB766829A (en) Multiple density oxide coated cathodes and filament wire
GB826802A (en) Improvements in or relating to the manufacture of thermionic cathodes
GB1516448A (en) Method of and apparatus for applying a coating of a suspension and/or solution to the inner wall of a tubular lamp
GB890385A (en) Improvements relating to electron discharge devices
GB825935A (en) Method of improving adherence of luminescent screens
GB455640A (en) Improvements in or relating to apparatus for manufacture of granule coated webs
JPS5549845A (en) Manufacturing method of colour picture tube
AU203678B2 (en) Method of treating glass envelopes of high voltage electron tubes
JPS5246818A (en) Electrostatic recording method