GB578150A - Improvements relating to electric discharge lamps - Google Patents
Improvements relating to electric discharge lampsInfo
- Publication number
- GB578150A GB578150A GB3050139A GB3050139A GB578150A GB 578150 A GB578150 A GB 578150A GB 3050139 A GB3050139 A GB 3050139A GB 3050139 A GB3050139 A GB 3050139A GB 578150 A GB578150 A GB 578150A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- voltage
- low
- bulb
- volts
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
Landscapes
- Surface Treatment Of Glass (AREA)
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
578,150. Discharge lamps. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd., and ALDINGTON, J. N. Nov. 21, 1939, No. 30501. Drawings to Specification. [Class 39 (i)] A mercury vapour discharge lamp with an inert gas-filling to operate at low pressure and low voltage, say 24 volts, has a separately heated cathode and the product of the interelectrode distance in centimetres by the pressure of the filling in millimetres lies between 2 and 35. The electrode may be separate helices, or the anode may be a gauze cylinder surrounding the cathode. The cathode may be a tungsten helix enclosing a rod of barium strontium silicate. The radiation is mainly ultraviolet, and may be employed as such, the bulb being of glass opaque to ordinary light, or the bulb may be coated with fluorescent material. The voltage of the cathode heating circuit is low, say 4 volts, as compared with the arc voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3050139A GB578150A (en) | 1939-11-21 | 1939-11-21 | Improvements relating to electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3050139A GB578150A (en) | 1939-11-21 | 1939-11-21 | Improvements relating to electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB578150A true GB578150A (en) | 1946-06-18 |
Family
ID=10308665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3050139A Expired GB578150A (en) | 1939-11-21 | 1939-11-21 | Improvements relating to electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB578150A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2137015A (en) * | 1980-06-20 | 1984-09-26 | Hanlet Jacques M | Fluorescent lighting system |
-
1939
- 1939-11-21 GB GB3050139A patent/GB578150A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2137015A (en) * | 1980-06-20 | 1984-09-26 | Hanlet Jacques M | Fluorescent lighting system |
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