JPS5450160A - Electrode of discharge lamp - Google Patents
Electrode of discharge lampInfo
- Publication number
- JPS5450160A JPS5450160A JP11634577A JP11634577A JPS5450160A JP S5450160 A JPS5450160 A JP S5450160A JP 11634577 A JP11634577 A JP 11634577A JP 11634577 A JP11634577 A JP 11634577A JP S5450160 A JPS5450160 A JP S5450160A
- Authority
- JP
- Japan
- Prior art keywords
- bulb
- arc
- anode
- discharge lamp
- tungsten
- 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
Abstract
PURPOSE: To prolong the life of electrode of discharge lamp, by making the arc receiving portion at the top of anode made of tungsten or its alloy with large crystal grains of sizes within a particular range, and thereby preventing darkening of bulb, disconnection of arc and lowering of brightness.
CONSTITUTION: In a discharge lamp having cathode 2 and anode 3 sealed in its bulb 1, arc receiving portion 3a at the top of said anode 3 made of tungsten or tungsten alloy is made with material having large grain sizes (less than 100 grains/ mm2). Such large cerystal grains can be obtained by heating an electrode material shaped by way of forging or machining, to higher than 2000 C (preferably, to 2200 W2350°C) under the vacuum of about 10-4W10-5 torr. In accordance with the above method, it is enabled to minimize the grain boundaries and thus to prevent disconnection of arc and lowering of brightness due to surface roughening. At the same time, darkening of bulb 1 can be also prevented that is possibly caused at the time of evacuating gas in the bulb 1 or when the lamp is used long
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11634577A JPS5450160A (en) | 1977-09-28 | 1977-09-28 | Electrode of discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11634577A JPS5450160A (en) | 1977-09-28 | 1977-09-28 | Electrode of discharge lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5450160A true JPS5450160A (en) | 1979-04-19 |
JPS6229863B2 JPS6229863B2 (en) | 1987-06-29 |
Family
ID=14684641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11634577A Granted JPS5450160A (en) | 1977-09-28 | 1977-09-28 | Electrode of discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5450160A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5650046A (en) * | 1979-10-01 | 1981-05-07 | Toshiba Corp | Electrode for electric-discharge lamp |
JPS5650045A (en) * | 1979-10-01 | 1981-05-07 | Toshiba Corp | Electrode for discharge lamp |
JPS58130588A (en) * | 1982-01-28 | 1983-08-04 | 松下電器産業株式会社 | Flexible circuit board |
US6768263B2 (en) * | 2001-10-30 | 2004-07-27 | Ushio Denki Kabushiki Kaisya | Short arc type mercury lamp |
-
1977
- 1977-09-28 JP JP11634577A patent/JPS5450160A/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5650046A (en) * | 1979-10-01 | 1981-05-07 | Toshiba Corp | Electrode for electric-discharge lamp |
JPS5650045A (en) * | 1979-10-01 | 1981-05-07 | Toshiba Corp | Electrode for discharge lamp |
JPS5821377B2 (en) * | 1979-10-01 | 1983-04-28 | 株式会社東芝 | Electrode for discharge lamp |
JPS5821378B2 (en) * | 1979-10-01 | 1983-04-28 | 株式会社東芝 | Electrode for discharge lamp |
JPS58130588A (en) * | 1982-01-28 | 1983-08-04 | 松下電器産業株式会社 | Flexible circuit board |
US6768263B2 (en) * | 2001-10-30 | 2004-07-27 | Ushio Denki Kabushiki Kaisya | Short arc type mercury lamp |
Also Published As
Publication number | Publication date |
---|---|
JPS6229863B2 (en) | 1987-06-29 |
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