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GB854751A - Improvements in or relating to high-pressure electric discharge tubes - Google Patents

Improvements in or relating to high-pressure electric discharge tubes

Info

Publication number
GB854751A
GB854751A GB5890/57A GB589057A GB854751A GB 854751 A GB854751 A GB 854751A GB 5890/57 A GB5890/57 A GB 5890/57A GB 589057 A GB589057 A GB 589057A GB 854751 A GB854751 A GB 854751A
Authority
GB
United Kingdom
Prior art keywords
diameter
discharge
focal spot
feb
electric discharge
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
GB5890/57A
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 GB854751A publication Critical patent/GB854751A/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

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

854,751. Discharge lamps. PHILIPS ELECTRICAL INDUSTRIES Ltd. Feb. 21, 1957 [Feb. 24, 1956], No. 5890/57. Class 39(1). A high-pressure electric discharge lamp of the compact-source type includes one electrode having a conical cavity, the apex of which emerges into a cylindrical bore, and the discharge is caused to operate without focal spot. Such a lamp has a life of several hundred operating hours without focal spot since the temperature throughout the conical surface is exceedingly uniform and the cylindrical bore decreases the current strength at which the discharge without focal spot occurs. The bottom of the axial bore, which preferably has a diameter of 0À3 to 0À5 times the diameter of the electrode 3 and an axial length exceeding its diameter, may contain electron-emmissive material such as thorium oxide. The opening angle of the conical cavity 4 is 30 to 150 degrees and preferably about 120 degrees. The substantially spherical quartz envelope 1 is filled with xenon at a pressure of about 10 atmospheres at room temperature.
GB5890/57A 1956-02-24 1957-02-21 Improvements in or relating to high-pressure electric discharge tubes Expired GB854751A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL854751X 1956-02-24

Publications (1)

Publication Number Publication Date
GB854751A true GB854751A (en) 1960-11-23

Family

ID=19847214

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5890/57A Expired GB854751A (en) 1956-02-24 1957-02-21 Improvements in or relating to high-pressure electric discharge tubes

Country Status (5)

Country Link
US (1) US2887603A (en)
DE (1) DE1053664B (en)
FR (1) FR1167169A (en)
GB (1) GB854751A (en)
NL (1) NL95307C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL99793C (en) * 1957-08-10 1961-11-15
US3005923A (en) * 1959-06-29 1961-10-24 Norman C Beese Modulated short arc lamp envelope structure
US3029359A (en) * 1960-03-29 1962-04-10 Gen Electric Thermionic electrode for discharge lamps
US3205388A (en) * 1960-12-30 1965-09-07 Lany Beatrice Pearson De Drill hole type cathode with cooling means
US3114855A (en) * 1961-06-27 1963-12-17 Bausch & Lomb Gas discharge lamp with a collimating reflector electrode
US3419947A (en) * 1965-12-10 1969-01-07 Gen Electric Compact source discharge lamp manufacture
US3777200A (en) * 1971-05-14 1973-12-04 Nasa High powered arc electrodes
US3916241A (en) * 1972-06-14 1975-10-28 Gte Sylvania Inc High pressure electric discharge lamp and electrode therefor
DE2634868B2 (en) * 1975-08-04 1980-12-04 Imperial Chemical Industries Ltd., London Coated composite film
DE10301478A1 (en) * 2003-01-16 2004-07-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Electrode for a high pressure discharge lamp
US8460045B2 (en) 2007-06-25 2013-06-11 General Electric Company High intensity discharge lamp with enhanced dimming characteristcs

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1428510A (en) * 1920-06-26 1922-09-05 Sperry Gyroscope Co Ltd Concentrated flaming arc lamp for projectors
US1632161A (en) * 1923-07-24 1927-06-14 Sperry Gyroscope Co Ltd Arc lamp
US2453118A (en) * 1946-05-08 1948-11-09 Western Union Telegraph Co Concentrated arc discharge device
US2662196A (en) * 1948-11-04 1953-12-08 Western Union Telegraph Co Concentrated arc lamp
CH297983A (en) * 1949-08-20 1954-04-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Electric high pressure gas discharge lamp with fixed glow electrodes.
US2716713A (en) * 1950-03-22 1955-08-30 Gen Electric Cold electrode pulse lamp structure
GB739047A (en) * 1951-08-09 1955-10-26 Gen Electric Co Ltd Improvements in high pressure metal vapour electric discharge lamps
US2673304A (en) * 1951-10-26 1954-03-23 Westinghouse Electric Corp Crater lamp
US2728871A (en) * 1954-06-09 1955-12-27 Sylvania Electric Prod Electric discharge lamp

Also Published As

Publication number Publication date
NL95307C (en)
FR1167169A (en) 1958-11-21
US2887603A (en) 1959-05-19
DE1053664B (en) 1959-03-26

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