GB511199A - Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it - Google Patents
Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with itInfo
- Publication number
- GB511199A GB511199A GB470238A GB470238A GB511199A GB 511199 A GB511199 A GB 511199A GB 470238 A GB470238 A GB 470238A GB 470238 A GB470238 A GB 470238A GB 511199 A GB511199 A GB 511199A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- series
- discharge
- lamp
- condenser
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
- H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
- H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
- H05B41/231—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for high-pressure lamps
Landscapes
- Electroluminescent Light Sources (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
511,199. Supply systems for discharge lamps and incandescent lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. fur Elektrische Gluhlampen). Feb. 15, 1938, No. 4702. [Class 38 (iv)] The supply circuit for a light source consisting of a H.P.M.V. discharge lamp in series, with an incandescent filament comprises at least one element which both has reactive impedance and is in series with both the filament and the discharge, the R.M.S. voltage across the element in full operation being not much less, or preferably somewhat greater, than that across the filament, whereby the red ratio of the combination is much greater than that of the H.P.M.V. lamp alone and the luminous efficiency of the combination is greater for a given life that it could be if no circuit element had reactive impedance, the H.P.M.V. lamp being in both cases of the same commercial type and the filament of the same material. The element used may comprise a simple choke or condenser in series with the discharge lamp and filament, or preferably a choke 3 and condenser 4, both in series with the discharge lamp 1 and filament 2; alternatively the condenser may shunt either the discharge lamp or filament or both. A choke in series with the filament and discharge may be replaced by the leakage reactance of a strayfield transformer from the secondary of which the lamp circuit is supplied. The red ratio may be increased by the use, in known manner, of luminescent materials emitting red light. Specifications 486,586 and 491,070 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB470238A GB511199A (en) | 1938-02-15 | 1938-02-15 | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB470238A GB511199A (en) | 1938-02-15 | 1938-02-15 | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB511199A true GB511199A (en) | 1939-08-15 |
Family
ID=9782191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB470238A Expired GB511199A (en) | 1938-02-15 | 1938-02-15 | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB511199A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2139022A (en) * | 1983-04-26 | 1984-10-31 | Gen Electric | Ballast circuit for lamps with low voltage gas discharge tubes |
| US4626745A (en) * | 1983-04-26 | 1986-12-02 | General Electric Company | Ballast circuit for lamps with low voltage gas discharge tubes |
| EP1324114A2 (en) * | 2001-12-21 | 2003-07-02 | Bose Corporation | Projection system with selective reflective screen |
| US7710645B2 (en) | 2007-06-29 | 2010-05-04 | Bose Corporation | Selective reflecting for laser projector |
| US8081368B2 (en) | 2007-03-29 | 2011-12-20 | Bose Corporation | Selective absorbing |
-
1938
- 1938-02-15 GB GB470238A patent/GB511199A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2139022A (en) * | 1983-04-26 | 1984-10-31 | Gen Electric | Ballast circuit for lamps with low voltage gas discharge tubes |
| FR2545311A1 (en) * | 1983-04-26 | 1984-11-02 | Gen Electric | BALLAST CIRCUIT FOR LAMPS EQUIPPED WITH DISCHARGE TUBES IN LOW VOLTAGE GAS |
| US4626745A (en) * | 1983-04-26 | 1986-12-02 | General Electric Company | Ballast circuit for lamps with low voltage gas discharge tubes |
| EP1324114A2 (en) * | 2001-12-21 | 2003-07-02 | Bose Corporation | Projection system with selective reflective screen |
| EP1324114A3 (en) * | 2001-12-21 | 2003-07-30 | Bose Corporation | Projection system with selective reflective screen |
| US8081368B2 (en) | 2007-03-29 | 2011-12-20 | Bose Corporation | Selective absorbing |
| US7710645B2 (en) | 2007-06-29 | 2010-05-04 | Bose Corporation | Selective reflecting for laser projector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2268512A (en) | Series lamp circuit | |
| GB511199A (en) | Improvements in sources of light comprising a high-pressure mercury vapour electric discharge and an incandescent filament in series with it | |
| GB523123A (en) | Improvements in sources of light comprising a high-pressure mercury-vapour electric discharge and an incandescent filament in series with it | |
| GB432057A (en) | Improvements in and relating to electric illuminating lamps | |
| GB501854A (en) | Improvements in high-pressure mercury-vapour electric discharge lamps | |
| GB521498A (en) | Device for operating high-pressure metal-vapour electric discharge lamps having thermionic electrodes | |
| GB633448A (en) | Apparatus for operating electric discharge lamps in series | |
| GB635304A (en) | Non-stroboscopic discharge lamp units | |
| US2056649A (en) | Gaseous electric discharge lamp device | |
| GB489591A (en) | Improvements in combinations of electric discharge lamps and electric incandescent lamps | |
| GB338494A (en) | Improvements in or relating to vacuum tube lights and methods of operating the same | |
| GB473347A (en) | Improvements relating to electric discharge lamps | |
| GB501901A (en) | Improvements in sources of light comprising a high-pressure mercury-vapour electric discharge device | |
| GB522917A (en) | Improvements relating to metal vapour electric discharge lamps | |
| GB484839A (en) | Improvements in electric discharge lamps | |
| GB533451A (en) | Improvements in and relating to electric discharge devices | |
| GB494045A (en) | Improvements in and relating to animated electric discharge lamps | |
| GB527497A (en) | Improvements in and relating to electric discharge apparatus | |
| GB529576A (en) | Improvements in combinations of electric discharge lamps with means for operating them | |
| GB495415A (en) | Improvements in or relating to combinations of an electric discharge device and material adapted to be excited to luminescence by the discharge in the device | |
| GB502585A (en) | Improvements in sources of light comprising electric discharge lamps | |
| GB524874A (en) | Improvements in electric discharge lamps | |
| GB463877A (en) | Improvements in and relating to circuits including electric discharge devices | |
| GB647033A (en) | Operative combination of low-pressure electric discharge and incandescent lamps | |
| GB635528A (en) | Improvements in or relating to circuit arrangements for electric discharge lamps |