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GB613847A - Improvements in or relating to electric discharge lamps and circuits therefor - Google Patents

Improvements in or relating to electric discharge lamps and circuits therefor

Info

Publication number
GB613847A
GB613847A GB31564/45A GB3156445A GB613847A GB 613847 A GB613847 A GB 613847A GB 31564/45 A GB31564/45 A GB 31564/45A GB 3156445 A GB3156445 A GB 3156445A GB 613847 A GB613847 A GB 613847A
Authority
GB
United Kingdom
Prior art keywords
wire
core
wires
discharge
lamp
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
GB31564/45A
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.)
EK Cole Ltd
Original Assignee
EK Cole 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
Priority to BE479820D priority Critical patent/BE479820A/xx
Priority to FR957886D priority patent/FR957886A/fr
Application filed by EK Cole Ltd filed Critical EK Cole Ltd
Priority to GB31564/45A priority patent/GB613847A/en
Priority to CH273532D priority patent/CH273532A/en
Priority to US3316A priority patent/US2526559A/en
Publication of GB613847A publication Critical patent/GB613847A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
    • 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
    • H05B41/22—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 having an auxiliary starting electrode

Landscapes

  • Water Treatment By Electricity Or Magnetism (AREA)
  • Discharge Lamp (AREA)

Abstract

613,847. Discharge lamps. COLE, Ltd., E. K., and HAEGELE, F. G. A. Nov. 23, 1945, No. 31564. [Class 39 (i)] A discharge lamp comprises cathodes a, each of which comprises a core of electrically conductive, highly porous, refractory material, having incorporated in it a thermionically active material, and two wires b, c interwound in spaced relation on the core, each wire making isolated points of contact with the core, one end of one wire being connected to one terminal of the lamp and one end of the other wire being connected to another terminal of the lamp at the same end thereof. Each wire b, c may be overwound with another wire d to make isolated points of contact with the core or the wires b, c may be provided with integral projections. The cores a may contain grooves to retain the wires b, c. One wire c on one core is connected to the other wire c on the other core by a current limiting resistance e or other impedance of a few thousand ohms. The remaining two wires b are connected to the A.C. mains supply in series with a stabilising impedance (for example a choke). An auxiliary electrode g in the form of a conducting metallic strip deposited on the tube wall and either connected to one wire b, c, directly or arranged in close spacial relationship therewith may be used for the dissipation of random wall charges which impede starting. When current is supplied to the circuit a multiplicity of small arcs occur between the rough cores a and the surrounding wires b, c, which serve to produce highly-activated hot spots acting as cathode spots for initiating the main discharge, the restarting peak at each half-cycle of the discharge being reduced, thus improving the power factor.
GB31564/45A 1945-11-23 1945-11-23 Improvements in or relating to electric discharge lamps and circuits therefor Expired GB613847A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE479820D BE479820A (en) 1945-11-23
FR957886D FR957886A (en) 1945-11-23
GB31564/45A GB613847A (en) 1945-11-23 1945-11-23 Improvements in or relating to electric discharge lamps and circuits therefor
CH273532D CH273532A (en) 1945-11-23 1948-01-14 Cathode for an electric discharge lamp.
US3316A US2526559A (en) 1945-11-23 1948-01-20 Electric discharge lamp and circuit therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31564/45A GB613847A (en) 1945-11-23 1945-11-23 Improvements in or relating to electric discharge lamps and circuits therefor

Publications (1)

Publication Number Publication Date
GB613847A true GB613847A (en) 1948-12-03

Family

ID=10325000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31564/45A Expired GB613847A (en) 1945-11-23 1945-11-23 Improvements in or relating to electric discharge lamps and circuits therefor

Country Status (5)

Country Link
US (1) US2526559A (en)
BE (1) BE479820A (en)
CH (1) CH273532A (en)
FR (1) FR957886A (en)
GB (1) GB613847A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829297A (en) * 1954-04-15 1958-04-01 Machlett Lab Inc Filament structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565565A (en) * 1922-02-02 1925-12-15 Westinghouse Lamp Co Electric gas lamp
US1971890A (en) * 1928-06-14 1934-08-28 Gen Electric Electric discharge tube
US1897642A (en) * 1931-04-16 1933-02-14 Gen Electric Gaseous electric discharge device
GB412879A (en) * 1933-03-10 1934-07-05 Gen Electric Co Ltd Improvements in electric discharge tubes
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
GB504120A (en) * 1937-10-18 1939-04-18 Gen Electric Co Ltd Improvements in electrodes for high-pressure mercury-vapour discharge devices

Also Published As

Publication number Publication date
CH273532A (en) 1951-02-15
US2526559A (en) 1950-10-17
BE479820A (en)
FR957886A (en) 1950-02-28

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