GB560707A - Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes - Google Patents

Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes

Info

Publication number
GB560707A
GB560707A GB17256/42A GB1725642A GB560707A GB 560707 A GB560707 A GB 560707A GB 17256/42 A GB17256/42 A GB 17256/42A GB 1725642 A GB1725642 A GB 1725642A GB 560707 A GB560707 A GB 560707A
Authority
GB
United Kingdom
Prior art keywords
switch
resistance
starting
heating
tube
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
GB17256/42A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB560707A publication Critical patent/GB560707A/en
Expired legal-status Critical Current

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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/06—Starting switches thermal only

Landscapes

  • Lasers (AREA)

Abstract

560,707. Control systems for space discharge apparatus. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 4, 1942, No. 17256. Convention date, Dec. 10, 1941. [Class 38 (iv)] To prevent continued attempts to start a defective discharge tube a starting switch 25, 26, controlling an electrode heating circuit and comprising a bimetallic element 25 heated by a resistance 29, whereby the heating circuit, closed at starting, is opened after a time interval to cause an inductance 14 to provide the starting impulse, comprises also a bimetallic element 26 heated by a high resistance 30 in shunt with the switch, whereby repeated operations of the switch produce a progressive movement of both elements 25, 26 in such a direction as to cause eventual contact between element 25 and a contact 31' connected to element 26, whereby the switch 25, 26 is short-circuited. The heating resistance 29 maintains this short circuit until the tube circuit is opened at the switch 15 or the tube is removed..The resistance 30 is arranged for slow heating and cooling. Its temperature-resistance coefficient determines the time available for attempts at starting and may be negative. The switch may operate in air or in an envelope containing hydrogen, helium, or a vacuum. Specifications 542,853 and 560,075 are referred to.
GB17256/42A 1941-12-10 1942-12-04 Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes Expired GB560707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US560707XA 1941-12-10 1941-12-10

Publications (1)

Publication Number Publication Date
GB560707A true GB560707A (en) 1944-04-17

Family

ID=22001964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17256/42A Expired GB560707A (en) 1941-12-10 1942-12-04 Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes

Country Status (1)

Country Link
GB (1) GB560707A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243487A (en) * 1990-04-27 1991-10-30 Chun Shu Chiang A thermal starter switch for fluorescent lights

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243487A (en) * 1990-04-27 1991-10-30 Chun Shu Chiang A thermal starter switch for fluorescent lights
GB2243487B (en) * 1990-04-27 1994-11-23 Chun Shu Chiang Thermal switch starter for fluorescent lights

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