GB943535A - Improvements in or relating to discharge lamps - Google Patents

Improvements in or relating to discharge lamps

Info

Publication number
GB943535A
GB943535A GB3509759A GB3509759A GB943535A GB 943535 A GB943535 A GB 943535A GB 3509759 A GB3509759 A GB 3509759A GB 3509759 A GB3509759 A GB 3509759A GB 943535 A GB943535 A GB 943535A
Authority
GB
United Kingdom
Prior art keywords
supply
emissive material
porous
impregnated
tungsten
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
GB3509759A
Inventor
Stanislav Miskarik
Emil Zelenay
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.)
Tesla AS
Original Assignee
Tesla AS
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 Tesla AS filed Critical Tesla AS
Priority to GB3509759A priority Critical patent/GB943535A/en
Publication of GB943535A publication Critical patent/GB943535A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

943,535. Cathode materials and processing. TESLA, NARODNI PODNIK. Oct. 16, 1959, No. 35097/59. Heading H1D. A discharge lamp has a supply cathode heated by the impact of the discharge comprising a porous metallic body, e.g. of tungsten, impregnated with a first supply of electron emissive material which during operation of the lamp diffuses to the surface of the porous body, and having a second supply of electron emissive material with a lower work function than that of the cathode body, formed independently of and of different material from the first supply, provided on the external surface of the body or in one or more recesses or grooves formed therein. In the construction shown in Fig. 3, the porous tungsten body 15 is impregnated with aluminium-barium oxide mixed with calcium oxide and has a recess 16 containing the second supply of emissive material 17 which can be a metal, a metallic oxide, an alloy or mixed crystals of substances such as barium, strontium and calcium carbonates, having a work function less than that of tungsten. In the construction shown in Fig. 4, the porous body comprises a cylindrical portion 22 integral with a cone-shaped portion 22<SP>1</SP> and the second supply of emissive material 25 is formed as a paste in the annular groove 24. In the construction shown in Fig. 5, the second supply of emissive material is formed as a coating 25 on the impregnated porous body 22. The second supply of emissive material can be applied by spraying, coating or cataphoresis. The mechanical strength can be improved by drying or sintering in an atmosphere of hydrogen, nitrogen or of another reducing or inert gas.
GB3509759A 1959-10-16 1959-10-16 Improvements in or relating to discharge lamps Expired GB943535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3509759A GB943535A (en) 1959-10-16 1959-10-16 Improvements in or relating to discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3509759A GB943535A (en) 1959-10-16 1959-10-16 Improvements in or relating to discharge lamps

Publications (1)

Publication Number Publication Date
GB943535A true GB943535A (en) 1963-12-04

Family

ID=10373785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3509759A Expired GB943535A (en) 1959-10-16 1959-10-16 Improvements in or relating to discharge lamps

Country Status (1)

Country Link
GB (1) GB943535A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349276A (en) * 1964-09-30 1967-10-24 Philips Corp High-pressure mercury vapor halogen lamp having an electrode thermally insulated from lead-in conductor
US3505557A (en) * 1966-12-14 1970-04-07 Philips Corp Indirectly heated cathode having portions with different thermal relations with a heater
US3548242A (en) * 1967-05-16 1970-12-15 Sylvania Electric Prod High pressure electric discharge device and cathode
US4104693A (en) * 1976-03-23 1978-08-01 Reliable Electric Company Gas filled surge arrester

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349276A (en) * 1964-09-30 1967-10-24 Philips Corp High-pressure mercury vapor halogen lamp having an electrode thermally insulated from lead-in conductor
US3505557A (en) * 1966-12-14 1970-04-07 Philips Corp Indirectly heated cathode having portions with different thermal relations with a heater
US3548242A (en) * 1967-05-16 1970-12-15 Sylvania Electric Prod High pressure electric discharge device and cathode
US4104693A (en) * 1976-03-23 1978-08-01 Reliable Electric Company Gas filled surge arrester

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