JPS54102069A - Metal halide lamp - Google Patents
Metal halide lampInfo
- Publication number
- JPS54102069A JPS54102069A JP826378A JP826378A JPS54102069A JP S54102069 A JPS54102069 A JP S54102069A JP 826378 A JP826378 A JP 826378A JP 826378 A JP826378 A JP 826378A JP S54102069 A JPS54102069 A JP S54102069A
- Authority
- JP
- Japan
- Prior art keywords
- luminous
- iode
- electrode
- electrodes
- maintenance ratio
- 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)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
PURPOSE: To provide the subject lamp wherein electrodes are made of pure tungsten and the temperature at the calescence point of electrodes is within a specific range, whereby blackening of the wall of a luminous tube due to the evaporation of electrodes is removed and the luminous maintenance ratio is improved.
CONSTITUTION: A tungsten filament, a thoriated tungsten filament or the like is used as a material of for the electrode 1, and a rase gas, mercury, dyprosium iode, tharium iode, cesium iode, and sodium iode are sealed in a luminous tube 2 respectively in suitable quantities so that the temperature at the calescence point of the electrode 1 is in the range of from 2500 to 2800°C. When the temperature at the calescence point of the electrode 1 becomes less than 2500°C, thorium contained in the electrode or electorn discharging meterial separates and adheres to the inner wal l of the luminous tube, thereby reducing the luminous flux maintenance ratio. When it exceeds 2800°C, evaporation of tungsten forming the electrodes begins and is unfit for use, and the wall of the luminous wall is blackened, thus the luminous flux maintenance ratio being reduced. Accordingly, by the above procedures it is possible to improve the luminous flux maintenance ratio.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP826378A JPS54102069A (en) | 1978-01-30 | 1978-01-30 | Metal halide lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP826378A JPS54102069A (en) | 1978-01-30 | 1978-01-30 | Metal halide lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54102069A true JPS54102069A (en) | 1979-08-11 |
Family
ID=11688257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP826378A Pending JPS54102069A (en) | 1978-01-30 | 1978-01-30 | Metal halide lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54102069A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0917180A1 (en) * | 1997-11-18 | 1999-05-19 | Matsushita Electronics Corporation | High pressure discharge lamp, lighting optical apparatus using the same as light source, and image display system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4853582A (en) * | 1971-11-02 | 1973-07-27 | ||
JPS5032794A (en) * | 1973-07-26 | 1975-03-29 |
-
1978
- 1978-01-30 JP JP826378A patent/JPS54102069A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4853582A (en) * | 1971-11-02 | 1973-07-27 | ||
JPS5032794A (en) * | 1973-07-26 | 1975-03-29 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0917180A1 (en) * | 1997-11-18 | 1999-05-19 | Matsushita Electronics Corporation | High pressure discharge lamp, lighting optical apparatus using the same as light source, and image display system |
US6211616B1 (en) | 1997-11-18 | 2001-04-03 | Matsushita Electronics Corporation | High pressure discharge lamp, with tungsten electrode and lighting optical apparatus and image display system using the same |
USRE38807E1 (en) * | 1997-11-18 | 2005-10-04 | Matsushita Electric Industrial Co., Ltd. | High pressure discharge lamp, with tungsten electrode and lighting optical apparatus and image display system using the same |
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