JPS5475875A - Discharge lamp - Google Patents
Discharge lampInfo
- Publication number
- JPS5475875A JPS5475875A JP14351777A JP14351777A JPS5475875A JP S5475875 A JPS5475875 A JP S5475875A JP 14351777 A JP14351777 A JP 14351777A JP 14351777 A JP14351777 A JP 14351777A JP S5475875 A JPS5475875 A JP S5475875A
- Authority
- JP
- Japan
- Prior art keywords
- electron emitting
- layer
- emitting substance
- heightened
- reduced
- 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.)
- Granted
Links
Landscapes
- Discharge Lamp (AREA)
Abstract
PURPOSE: To provide a descharge lamp which has a high binding strength of electron emitting substance and can have its starting voltage reduced and its light flux maintaining ratio heightened by keeping the electron emitting performance high.
CONSTITUTION: A pair of electrodes 4 and an auxiliary electrode 41 are provided at sealed parts 3 on both the ends of a tube 2 made of quartz glass. Each of the electrodes 4 is made by providing an electrode coil of high melting point metal around an electrode shaft 7 and providing an electron emitting substance layer 9 between the shaft 7 and the coil 8. The layer 9 contains tungstate. The tungsten content percentage is gradually reduced toward the external surface of the layer 9. Since the tungstate serves as aggregate, the binding strength of the electron emitting substance is heightened. Because the percentage of the electron emitting substance is gradually raised toward the external surface of the layer 9, the electron emitting performance is kept high. As a result, the starting voltage can be reduced and the light flux maintaining ratio can be heightened.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14351777A JPS5475875A (en) | 1977-11-30 | 1977-11-30 | Discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14351777A JPS5475875A (en) | 1977-11-30 | 1977-11-30 | Discharge lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5475875A true JPS5475875A (en) | 1979-06-18 |
JPS624819B2 JPS624819B2 (en) | 1987-02-02 |
Family
ID=15340573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14351777A Granted JPS5475875A (en) | 1977-11-30 | 1977-11-30 | Discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5475875A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001307676A (en) * | 2000-04-20 | 2001-11-02 | Toshiba Corp | Electrode for electron emission and its manufacturing method, and discharge lamp using it |
-
1977
- 1977-11-30 JP JP14351777A patent/JPS5475875A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001307676A (en) * | 2000-04-20 | 2001-11-02 | Toshiba Corp | Electrode for electron emission and its manufacturing method, and discharge lamp using it |
Also Published As
Publication number | Publication date |
---|---|
JPS624819B2 (en) | 1987-02-02 |
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