JPS5471880A - High-pressure sodium vapor lamp - Google Patents
High-pressure sodium vapor lampInfo
- Publication number
- JPS5471880A JPS5471880A JP13932977A JP13932977A JPS5471880A JP S5471880 A JPS5471880 A JP S5471880A JP 13932977 A JP13932977 A JP 13932977A JP 13932977 A JP13932977 A JP 13932977A JP S5471880 A JPS5471880 A JP S5471880A
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- electrodes
- alumina
- pressure sodium
- sodium vapor
- 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 provide a high-pressure sodium vapor lamp, which is designed such that top of electrodes is shaped in a conical form pointed with a suitable angle, and the portion of core rod of the electrodes projected from electrode coil is selected suitabley, such that it is enabled to prevent voltage rise of the lamp due to vibration and thus to prevent unexpected extinguishing of the lamp.
CONSTITUTION: Electrodes 6, 7 of light emitting tube 1 are protruded outward from the top of respective electrode coil 9, and they have an electrode rod 8 shaped at its top in a conical form. It was found from experiments that voltage rise of the lamp is small when the angle θ at the top of the cone is 30°W90° and ratio of protrusion length (l) to the diamether ϕ of core rod 8 is 1.8W2.7. In the above arrangement, light emitting tube 1 made of polycrystalline alumina or monocrystalline alumina is sealed at its opposite end portions with cement by means of end caps 2, 3 which are made of polycrystalline alumina ceramics or monocrystalline alumina.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13932977A JPS5471880A (en) | 1977-11-18 | 1977-11-18 | High-pressure sodium vapor lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13932977A JPS5471880A (en) | 1977-11-18 | 1977-11-18 | High-pressure sodium vapor lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5471880A true JPS5471880A (en) | 1979-06-08 |
Family
ID=15242770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13932977A Pending JPS5471880A (en) | 1977-11-18 | 1977-11-18 | High-pressure sodium vapor lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5471880A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5035356A (en) * | 1973-06-07 | 1975-04-04 |
-
1977
- 1977-11-18 JP JP13932977A patent/JPS5471880A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5035356A (en) * | 1973-06-07 | 1975-04-04 |
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