GB701871A - Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes - Google Patents

Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes

Info

Publication number
GB701871A
GB701871A GB3008/52A GB300852A GB701871A GB 701871 A GB701871 A GB 701871A GB 3008/52 A GB3008/52 A GB 3008/52A GB 300852 A GB300852 A GB 300852A GB 701871 A GB701871 A GB 701871A
Authority
GB
United Kingdom
Prior art keywords
cathodes
pores
relating
producing
methods
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
GB3008/52A
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 GB701871A publication Critical patent/GB701871A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Electrolytic Production Of Metals (AREA)

Abstract

701,871. Thermionic cathode constructions. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 5, 1952 [Feb. 8, 1951], No. 3008/52. Class 39(1) In a dispenser cathode of the type having an internal supply of an alkaline earth metal compound behind a wall of porous refractory metal, the pores of the latter are closed at portions of the cathode surface from which emission is not required. The figure shows an example with the pores of the end surface 9 closed over the cross-hatched parts 5 and 8. The pores can be closed by grinding or rubbing.
GB3008/52A 1951-02-08 1952-02-05 Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes Expired GB701871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL298304X 1951-02-08

Publications (1)

Publication Number Publication Date
GB701871A true GB701871A (en) 1954-01-06

Family

ID=19783092

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3008/52A Expired GB701871A (en) 1951-02-08 1952-02-05 Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes

Country Status (4)

Country Link
BE (1) BE509019A (en)
CH (1) CH298304A (en)
FR (1) FR1050568A (en)
GB (1) GB701871A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880342A (en) * 1956-10-25 1959-03-31 Gen Dynamics Corp Electron beam for a cathode ray tube
US2972078A (en) * 1959-01-23 1961-02-14 Philips Corp Carburization of dispenser cathodes
US2975322A (en) * 1958-12-29 1961-03-14 Raytheon Co Indirectly heated cathodes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8105921A (en) * 1981-12-31 1983-07-18 Philips Nv TELEVISION ROOM TUBE.
JPH11339633A (en) * 1997-11-04 1999-12-10 Sony Corp Impregnated cathode and manufacture therefor and electron gun and electronic tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880342A (en) * 1956-10-25 1959-03-31 Gen Dynamics Corp Electron beam for a cathode ray tube
US2975322A (en) * 1958-12-29 1961-03-14 Raytheon Co Indirectly heated cathodes
US2972078A (en) * 1959-01-23 1961-02-14 Philips Corp Carburization of dispenser cathodes

Also Published As

Publication number Publication date
FR1050568A (en) 1954-01-08
CH298304A (en) 1954-04-30
BE509019A (en)

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