GB461315A - Improvements in or relating to electric incandescent lamps - Google Patents
Improvements in or relating to electric incandescent lampsInfo
- Publication number
- GB461315A GB461315A GB22245/35A GB2224535A GB461315A GB 461315 A GB461315 A GB 461315A GB 22245/35 A GB22245/35 A GB 22245/35A GB 2224535 A GB2224535 A GB 2224535A GB 461315 A GB461315 A GB 461315A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- gas
- per
- lamp
- electric incandescent
- 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
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/50—Selection of substances for gas fillings; Specified pressure thereof
Landscapes
- Discharge Lamp (AREA)
Abstract
461,315. Electric incandescent lamps. STRATEG STRAHLUNGSTECHNIK GES. Aug. 6, 1935, No. 22245. Convention date, Aug. 6, 1934. [Class 39 (ii)] In order to reduce the heat conduction and convection losses to a value not greater than 40 per cent of the total watt consumption, a gas-filled electric incandescent lamp with a filament of tungsten or other refractory metal is provided with a high-pressure gas filling consisting wholly or mainly of krypton or xenon or a mixture of those gases, a bulb volume of not more than 2À5 cubic centimetres per millimetre length of filament, and a concentrated filament giving a light yield which, for the voltage range 200-250 is at least 0À5 Heffner lumens per watt per millimetre length of filament, and for the voltage range 100-150 is at least 0À8 Heffner lumens per watt per millimetre length of filament, assuming a mean burning life of the lamp of 1,000 hours. The filament may be a single or multiple coil, the coil or coils of which may be of round or fiat cross-section. In cases where a single filament satisfying the above requirements does not ensure the requisite life of the lamp, a multiple filament arrangement may be employed so that another filament is brought into operation when the first one burns out. The gas pressure employed may be that of 550 m.m. of mercury. Preferably the filling gas contains a small quantity, for example 10 per cent, of a gas such as nitrogen, to prevent short circuiting. Reference has been directed by the Comptroller to Specification 420,575.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE461315X | 1934-08-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB461315A true GB461315A (en) | 1937-02-08 |
Family
ID=6539845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22245/35A Expired GB461315A (en) | 1934-08-06 | 1935-08-06 | Improvements in or relating to electric incandescent lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB461315A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2595506A1 (en) * | 1986-03-04 | 1987-09-11 | Pk Tekhnolog | COMPOSITION FOR FILLING INCANDESCENT LAMPS |
EP0241599A2 (en) * | 1986-04-14 | 1987-10-21 | Stanley Electric Co., Ltd. | High efficacy incandescent lamp |
-
1935
- 1935-08-06 GB GB22245/35A patent/GB461315A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2595506A1 (en) * | 1986-03-04 | 1987-09-11 | Pk Tekhnolog | COMPOSITION FOR FILLING INCANDESCENT LAMPS |
EP0241599A2 (en) * | 1986-04-14 | 1987-10-21 | Stanley Electric Co., Ltd. | High efficacy incandescent lamp |
EP0241599A3 (en) * | 1986-04-14 | 1989-03-22 | Stanley Electric Co., Ltd. | High efficacy incandescent lamp |
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