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 it

Info

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
Grant status
Application
Patent type
Prior art keywords
filament
discharge
lamp
series
element
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
Application number
GB470238A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEN ELECTRIC CO Ltd
General Electric Co Ltd
Original Assignee
GEN ELECTRIC CO Ltd
General Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/16Circuit 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
    • H05B41/20Circuit 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
    • H05B41/23Circuit 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
    • H05B41/231Circuit 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

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.
GB470238A 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 Expired GB511199A (en)

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 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)

* Cited by examiner, † Cited by third party
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

Cited By (7)

* Cited by examiner, † Cited by third party
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 A ballast circuit for lamps equipped tubes discharge in a gas at low voltage
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

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