GB1256369A - High pressure electric discharge lamp - Google Patents

High pressure electric discharge lamp

Info

Publication number
GB1256369A
GB1256369A GB61146/68A GB6114668A GB1256369A GB 1256369 A GB1256369 A GB 1256369A GB 61146/68 A GB61146/68 A GB 61146/68A GB 6114668 A GB6114668 A GB 6114668A GB 1256369 A GB1256369 A GB 1256369A
Authority
GB
United Kingdom
Prior art keywords
thorium
mercury
scandium
arc
argon
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
GB61146/68A
Inventor
Frederic Koury
John F Waymouth
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.)
GTE Sylvania Inc
Original Assignee
GTE Sylvania Inc
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 GTE Sylvania Inc filed Critical GTE Sylvania Inc
Publication of GB1256369A publication Critical patent/GB1256369A/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
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent

Landscapes

  • Discharge Lamp (AREA)

Abstract

1,256,369. Metal-vapour discharge lamps. GTE SYLVANIA Inc. 23 Dec., 1968 [21 Dec., 1967], No. 61146/68. Heading H1D. A high pressure discnarge lamp has a filling which includes scandium; thorium ; mercury, in a quantity which is completely vaporized at the normal operating temperature; chlorine, bromine, or iodine in an atomic ratio with respect to mercury of from 0À025 to 0À85; and an alkali metal. In the disclosed fillings the scandium is present in a concentration of 2À5 Î 10<SP>-7</SP> to 1À5 Î 10<SP>-5</SP> gm. atoms per cm. of arc length, the thorium in the range 5 x 10<SP>-8</SP> to 1 x 10<SP>-5</SP>, and the ratio of thorium to the sum of the thorium and scandium lies in the range 10 to 90%, but a part of the disclosed range of fillings is the subject of a disclaimer. The mercury may be present in the quantity 2À5 Î 10<SP>-5</SP> to 8 x 10<SP>-5</SP>gm. atoms per cm. of arc length, and the alkali metal may be sodium in a quantity 1À0 x 10<SP>-6</SP> to 1À0 x 10<SP>-4</SP> gm. atoms per cm. of arc length. The lamp may have a quartz arc tube within an outer envelope, may operate at 450‹ to 700‹ C., and is provided with a starting electrode and series resistor. Prior to filling, the arc tube is evacuated and baked out, flushed with argon, filled with argon through which an arc is passed, and again pumped out. Mercury, mercuric iodide, scandium, thorium, and sodium iodide are added to the arc tube, which is then filled to atmospheric pressure with argon which is subsequently leaked out to a pressure of 23 torr before sealing off the tube.
GB61146/68A 1967-12-21 1968-12-23 High pressure electric discharge lamp Expired GB1256369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US692575A US3407327A (en) 1967-12-21 1967-12-21 High pressure electric discharge device containing mercury, halogen, scandium and alkalimetal

Publications (1)

Publication Number Publication Date
GB1256369A true GB1256369A (en) 1971-12-08

Family

ID=24781132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB61146/68A Expired GB1256369A (en) 1967-12-21 1968-12-23 High pressure electric discharge lamp

Country Status (2)

Country Link
US (1) US3407327A (en)
GB (1) GB1256369A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433237A1 (en) * 1978-08-10 1980-03-07 Gen Electric MINIATURE ARC LAMP AND METAL VAPOR
EP0897191A2 (en) * 1997-08-11 1999-02-17 Osram Sylvania Inc. Videoprojection lamps

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514659A (en) * 1967-07-03 1970-05-26 Sylvania Electric Prod High pressure vapor discharge lamp with cesium iodide
US3577029A (en) * 1968-11-29 1971-05-04 Sylvania Electric Prod High-pressure electric discharge device containing mercury, halogen, scandium and samarium
US3619683A (en) * 1969-05-23 1971-11-09 British Lighting Ind Ltd Arc tubes
GB1343780A (en) * 1970-06-26 1974-01-16 Thorn Electrical Ind Ltd Discharge lamps
FR2102866A5 (en) * 1970-08-27 1972-04-07 Eclairage Lab
US3832587A (en) * 1971-11-26 1974-08-27 Gte Sylvania Inc Heavily loaded metal halide discharge lamp
US4023059A (en) * 1972-06-05 1977-05-10 Scott Anderson High pressure light emitting electric discharge device
US3911308A (en) * 1974-02-07 1975-10-07 Matsushita Electronics Corp High-pressure metal-vapor discharge lamp
US4053805A (en) * 1974-12-09 1977-10-11 Gte Sylvania Incorporated Arc discharge lamp comprising mercury, scandium and lithium iodide, scandium emission being suppressed
US3979624A (en) * 1975-04-29 1976-09-07 Westinghouse Electric Corporation High-efficiency discharge lamp which incorporates a small molar excess of alkali metal halide as compared to scandium halide
US4170746A (en) * 1977-12-27 1979-10-09 General Electric Company High frequency operation of miniature metal vapor discharge lamps
US4245175A (en) * 1978-12-08 1981-01-13 Westinghouse Electric Corp. Metal halide lamp having lead metal powder to reduce blackening
US4225635A (en) * 1979-03-02 1980-09-30 Westinghouse Electric Corp. Method for applying reacted boron oxide layer to vitreous silica substrate
US4360756A (en) * 1979-11-13 1982-11-23 General Electric Company Metal halide lamp containing ThI4 with added elemental cadmium or zinc
DE3048040A1 (en) * 1979-12-26 1981-09-10 Gte Products Corp., Wilmington, Del. METHOD FOR PRODUCING A METAL HALOGENIDE ARCH DISCHARGE LAMP
US4310774A (en) * 1980-03-03 1982-01-12 Gte Products Corporation Arc discharge lamp containing scandium and scandium halide
US4302699A (en) * 1980-03-24 1981-11-24 Gte Products Corporation Low wattage metal halide arc discharge lamp having optimum efficacy
US4360758A (en) * 1981-01-23 1982-11-23 Westinghouse Electric Corp. High-intensity-discharge lamp of the mercury-metal halide type which efficiently illuminates objects with excellent color appearance
JPS58112239A (en) * 1981-12-25 1983-07-04 Toshiba Corp Compact metal halide lamp
US4709184A (en) * 1984-08-20 1987-11-24 Gte Products Corporation Low wattage metal halide lamp
US4963790A (en) * 1985-12-27 1990-10-16 Gte Products Corporation Low wattage metal halide discharge lamp
US4798995A (en) * 1986-10-06 1989-01-17 General Electric Company Metal halide lamp containing halide composition to control arc tube performance
US5013968A (en) * 1989-03-10 1991-05-07 General Electric Company Reprographic metal halide lamps having long life and maintenance
US5111104A (en) * 1989-12-11 1992-05-05 Gte Products Corporation Triple-enveloped metal-halide arc discharge lamp having lower color temperature
US5225738A (en) * 1990-12-14 1993-07-06 North American Philips Corporation Metal halide lamp with improved lumen output and color rendition
US5466987A (en) * 1991-12-23 1995-11-14 Osram Sylvania Inc. Rigid mounting for arc discharge lamp arc tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234421A (en) * 1961-01-23 1966-02-08 Gen Electric Metallic halide electric discharge lamps
DE1177248B (en) * 1962-08-22 1964-09-03 Patra Patent Treuhand Electric high pressure vapor discharge lamp with a color-correcting additional filling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433237A1 (en) * 1978-08-10 1980-03-07 Gen Electric MINIATURE ARC LAMP AND METAL VAPOR
EP0897191A2 (en) * 1997-08-11 1999-02-17 Osram Sylvania Inc. Videoprojection lamps
EP0897191A3 (en) * 1997-08-11 1999-04-21 Osram Sylvania Inc. Videoprojection lamps

Also Published As

Publication number Publication date
US3407327A (en) 1968-10-22

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