JPS57197740A - Metal halide lamp - Google Patents

Metal halide lamp

Info

Publication number
JPS57197740A
JPS57197740A JP8103982A JP8103982A JPS57197740A JP S57197740 A JPS57197740 A JP S57197740A JP 8103982 A JP8103982 A JP 8103982A JP 8103982 A JP8103982 A JP 8103982A JP S57197740 A JPS57197740 A JP S57197740A
Authority
JP
Japan
Prior art keywords
iodide
scandium
electrodes
emitting tube
quicksilver
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.)
Pending
Application number
JP8103982A
Other languages
Japanese (ja)
Inventor
Hiromitsu Matsuno
Shunji Kazui
Mikiya Yamane
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8103982A priority Critical patent/JPS57197740A/en
Publication of JPS57197740A publication Critical patent/JPS57197740A/en
Pending 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

Abstract

PURPOSE:To enhance the maintenance ratio of light flux by encapsulating sodium iodide, scandium iodide and cesium iodide, in addition to rare gases and quicksilver, in a light emitting tube and by selecting the electrode brightness temperature at within a certain specific extent. CONSTITUTION:A quarts glass light-emitting tube 2 is equipped with electrodes 1, 1 at its both sides, and in this tube 2 are encapsulated iodides with cesium iodide in addition to sodium iodide and scandium iodide together with rare gases and quicksilver. The electrodes are made of pure tungsten, whose brightness temperature shall be selected at within 2,500-2,800 deg.C. Accordingly, metal scandium produced by dissociation of the scandium iodide or metal silicon by dissociation of silicon iodide, which are attached to the electrodes 1, will evaporate immediately, causing scarce evaporation of the tungsten, so that walls of the light emitting tube 2 will never blacken to ensure enhancement of the maintenance ratio of light flux.
JP8103982A 1982-05-14 1982-05-14 Metal halide lamp Pending JPS57197740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8103982A JPS57197740A (en) 1982-05-14 1982-05-14 Metal halide lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8103982A JPS57197740A (en) 1982-05-14 1982-05-14 Metal halide lamp

Publications (1)

Publication Number Publication Date
JPS57197740A true JPS57197740A (en) 1982-12-04

Family

ID=13735300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8103982A Pending JPS57197740A (en) 1982-05-14 1982-05-14 Metal halide lamp

Country Status (1)

Country Link
JP (1) JPS57197740A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6164060A (en) * 1984-08-20 1986-04-02 ジー・テイー・イー・プロダクツ・コーポレイシヨン Low wattage number metal halide lamp
US7583030B2 (en) * 2003-07-21 2009-09-01 Advanced Lighting Technologies, Inc. Dopant-free tungsten electrodes in metal halide lamps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6164060A (en) * 1984-08-20 1986-04-02 ジー・テイー・イー・プロダクツ・コーポレイシヨン Low wattage number metal halide lamp
US7583030B2 (en) * 2003-07-21 2009-09-01 Advanced Lighting Technologies, Inc. Dopant-free tungsten electrodes in metal halide lamps

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