JPS6431343A - Metal halide lamp - Google Patents
Metal halide lampInfo
- 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
Links
Landscapes
- 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.
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)
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 |
-
1987
- 1987-07-28 JP JP18664587A patent/JPS6431343A/en active Pending
Cited By (2)
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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