US2207133A - Electric discharge lamp - Google Patents

Electric discharge lamp Download PDF

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Publication number
US2207133A
US2207133A US238650A US23865038A US2207133A US 2207133 A US2207133 A US 2207133A US 238650 A US238650 A US 238650A US 23865038 A US23865038 A US 23865038A US 2207133 A US2207133 A US 2207133A
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US
United States
Prior art keywords
envelope
electric discharge
discharge lamp
sleeve
electrode
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 - Lifetime
Application number
US238650A
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English (en)
Inventor
William J Scott
Harry K Bourne
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2207133A publication Critical patent/US2207133A/en
Anticipated expiration legal-status Critical
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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
    • H01J61/10—Shields, screens, or guides for influencing the discharge

Definitions

  • This invention relates to electric discharge lamps and more particularly to lamps of the high vapor pressure type similar to those disclosed in the United States Patent 2,094,694 issued October 5, 1937.
  • Such lamps are usually made with envelopes of quartz or high melting point glass, and we have observed that, the material in the neighborhood of the electrodes is frequently attacked and devitrified.
  • the object of this invention is to provide means for preventing this devitriflcation, and to that end it consists in providing means for protecting the wall of the envelope in the vicinity of the cathode from sputtering which may cause devitriflcation and from heat radiation from the cathode.
  • This means may consist .of a shield between the cathode and the wall of the lamp such as a cylinder or sleeve of refractory material, for example, of tungsten, molybdenum or The material forming ti e. wall of the quartz. envelope will then be protected from sputtered material from the cathode, and the devitrification will be reduced owing to the temperature of the wall being reduced, and owing to the shielding from the discharge and the sputtered material.
  • Fig. 1 is a side elevational, partly sectional view of one embodiment of the invention
  • Fig. 2 is a similar view of another embodiment I of the invention.
  • Fig. 3- is a similar view of stint-another embodiment'of the invention.
  • the gaseous electric discharge device comprises a-tubular: envelopel of quartz, into which an electrode 2 is sealed.
  • The-electrodes are preferably thermionic, activated electrodes which serve alternately as anode and as cathode when the device is operated on alternating current;
  • the sealed. envelope I. has a starting gas therein, such as argon, and a quantity oi-metal, such as mercury, the vapor of which .is luminosity producing during the operation-of the device.
  • a sleeve 4 of tungsten or molybdenum is inserted in the envelope 1, so that it surrounds the electrode-2.
  • the sleeve is made of metal, as in this case, it may be utilized as a starting or auxiliary electrode by providing a current lead therefor.
  • a thin sleeve of molybdenum or other suitable refrac-'- tory metal 4 is sealed between an inner quartz sleeve Sand the outer envelope I so that it forms II a barrier which will prevent devitriflcation from spreading from the inner quartz shield to the outer envelope.
  • the metal sleeve may be utilized as an electrode.
  • An electric discharge lamp of the highpressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizablematerial-therein, and I a sleeve of refractory metal fused into the end of said envelope and surrounding one of said electrodes, part of the vitreous material of said envelope beinginterposedbetween said electrode and saidmetal sleeve and covering'the major I portion of the-inner surface of said sleeve, said sleeve preventing devitriflcation of said envelope in the region of said electrode.
  • An electric discharge lamp of the-high pressure type comprising a tubular envelope of vitreous material, electrodes sealed therein at the ends thereof, a vaporizable material therein, and

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  • Vessels And Coating Films For Discharge Lamps (AREA)
US238650A 1937-11-03 1938-11-03 Electric discharge lamp Expired - Lifetime US2207133A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2207133X 1937-11-03

Publications (1)

Publication Number Publication Date
US2207133A true US2207133A (en) 1940-07-09

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ID=10901207

Family Applications (1)

Application Number Title Priority Date Filing Date
US238650A Expired - Lifetime US2207133A (en) 1937-11-03 1938-11-03 Electric discharge lamp

Country Status (2)

Country Link
US (1) US2207133A (fr)
FR (1) FR845552A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464762A (en) * 1945-09-15 1949-03-15 Sylvania Electric Prod Pulser tube
US2567491A (en) * 1943-12-29 1951-09-11 Mitchell John Wesley Luminous discharge tube
US2727187A (en) * 1950-03-03 1955-12-13 Gen Electric Electric discharge lamp
US3767957A (en) * 1972-03-17 1973-10-23 Ott J Labor Inc Fluorescent lamp with shielded electrodes
US5751111A (en) * 1994-04-13 1998-05-12 U.S. Philips Corporation High-pressure metal halide lamp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567491A (en) * 1943-12-29 1951-09-11 Mitchell John Wesley Luminous discharge tube
US2464762A (en) * 1945-09-15 1949-03-15 Sylvania Electric Prod Pulser tube
US2727187A (en) * 1950-03-03 1955-12-13 Gen Electric Electric discharge lamp
US3767957A (en) * 1972-03-17 1973-10-23 Ott J Labor Inc Fluorescent lamp with shielded electrodes
US5751111A (en) * 1994-04-13 1998-05-12 U.S. Philips Corporation High-pressure metal halide lamp

Also Published As

Publication number Publication date
FR845552A (fr) 1939-08-28

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