JPS6431343A - Metal halide lamp - Google Patents

Metal halide lamp

Info

Publication number
JPS6431343A
JPS6431343A JP18664587A JP18664587A JPS6431343A JP S6431343 A JPS6431343 A JP S6431343A JP 18664587 A JP18664587 A JP 18664587A JP 18664587 A JP18664587 A JP 18664587A JP S6431343 A JPS6431343 A JP S6431343A
Authority
JP
Japan
Prior art keywords
thorium
electrode
lamp
luminous tube
scandium oxide
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
JP18664587A
Other languages
Japanese (ja)
Inventor
Toshihiro Kumazawa
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.)
Iwasaki Denki KK
Original Assignee
Iwasaki Denki KK
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 Iwasaki Denki KK filed Critical Iwasaki Denki KK
Priority to JP18664587A priority Critical patent/JPS6431343A/en
Publication of JPS6431343A publication Critical patent/JPS6431343A/en
Pending legal-status Critical Current

Links

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  • Discharge Lamp (AREA)

Abstract

PURPOSE:To obtain a metal halide lamp with the excellent lamp characteristic and long life by using tungsten not containing thorium for an electrode material, coating scandium oxide on electrode coils, and adding and sealing silicon and a specific quantity of thorium in a luminous tube. CONSTITUTION:Tungsten electrode spindles 3a, 3b not containing thorium or thorium oxide are sealed via molybdenum foils 4a, 4b at both ends of a tubular bulb made of silica glass. Scandium oxide is coated as an electron emitting material on coils 2a, 2b at tips of the electrode spindles 3a, 3b. Silicon and thorium of 0.125mg/cc are added and sealed as the reaction material of scandium oxide in a luminous tube 1. The light flux maintaining characteristic during the lamp life period is improved according to this constitution, the devitrification and blackening of the luminous tube can be prevented, and the rise of the lamp voltage can be suppressed.
JP18664587A 1987-07-28 1987-07-28 Metal halide lamp Pending JPS6431343A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18664587A JPS6431343A (en) 1987-07-28 1987-07-28 Metal halide lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18664587A JPS6431343A (en) 1987-07-28 1987-07-28 Metal halide lamp

Publications (1)

Publication Number Publication Date
JPS6431343A true JPS6431343A (en) 1989-02-01

Family

ID=16192213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18664587A Pending JPS6431343A (en) 1987-07-28 1987-07-28 Metal halide lamp

Country Status (1)

Country Link
JP (1) JPS6431343A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647964A1 (en) * 1993-10-07 1995-04-12 Koninklijke Philips Electronics N.V. High-pressure metal halide discharge lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647964A1 (en) * 1993-10-07 1995-04-12 Koninklijke Philips Electronics N.V. High-pressure metal halide discharge lamp
BE1007595A3 (en) * 1993-10-07 1995-08-16 Philips Electronics Nv HIGH-metal halide discharge LAMP.

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