GB473606A - Improvements in and relating to electrodes for electric discharge devices - Google Patents

Improvements in and relating to electrodes for electric discharge devices

Info

Publication number
GB473606A
GB473606A GB1085336A GB1085336A GB473606A GB 473606 A GB473606 A GB 473606A GB 1085336 A GB1085336 A GB 1085336A GB 1085336 A GB1085336 A GB 1085336A GB 473606 A GB473606 A GB 473606A
Authority
GB
United Kingdom
Prior art keywords
tube
starting
electrode
sealed
envelope
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
GB1085336A
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
Priority to GB1085336A priority Critical patent/GB473606A/en
Publication of GB473606A publication Critical patent/GB473606A/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
    • H05B41/14—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
    • H05B41/232—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 low-pressure lamps
    • H05B41/233—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 low-pressure lamps using resonance circuitry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0072—Disassembly or repair of discharge tubes
    • H01J2893/0073—Discharge tubes with liquid poolcathodes; constructional details
    • H01J2893/0074—Cathodic cups; Screens; Reflectors; Filters; Windows; Protection against mercury deposition; Returning condensed electrode material to the cathodic cup; Liquid electrode level control
    • H01J2893/0087—Igniting means; Cathode spot maintaining or extinguishing means

Landscapes

  • Lasers (AREA)

Abstract

473,606. Discharge apparatus. BRITISH THOMSON - HOUSTON CO., Ltd., and KNIGHT, H. DE B. April 15, 1936, No. 10853. [Class 39 (i)] In electric discharge devices of the type in which the discharge is initiated by a timed voltage impulse applied to an auxiliary electrode, the latter is isolated in a hermetically sealed tube situated inside the envelope of the discharge device. The starting electrode 15, Fig. 2, is disposed on the inside wall of a part 13 of a tube 11 which dips into the mercury cathode 9 and is isolated from the main part of the tube by a seal 17 so that fracture of the tube 13 does not damage the envelope 8 of the discharge device. A modification is shown in Fig. 3, in which the sealed off part of the tube 11 is of inverted mushroom shape so that the depth of mercury forming the cathode is small in the neighbourhood of the starting electrode 15. The starting electrode may be a band of conducting material painted or sprayed on the inside of the tube 11 or a quantity of mercury. In the latter case, the base of the tube shown in Fig. 3, is thickened to reduce its capacity. Several starting electrodes may be positioned in a discharge device so as to function either in alternation for the purpose of spreading the starting arc, or in parallel, or as spares. In a modification, the outer end of the sealed tube 11 may be supported in an insulating sleeve which is sealed to the envelope and through which the lead to the electrode passes.
GB1085336A 1936-04-15 1936-04-15 Improvements in and relating to electrodes for electric discharge devices Expired GB473606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1085336A GB473606A (en) 1936-04-15 1936-04-15 Improvements in and relating to electrodes for electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1085336A GB473606A (en) 1936-04-15 1936-04-15 Improvements in and relating to electrodes for electric discharge devices

Publications (1)

Publication Number Publication Date
GB473606A true GB473606A (en) 1937-10-15

Family

ID=9975517

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1085336A Expired GB473606A (en) 1936-04-15 1936-04-15 Improvements in and relating to electrodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB473606A (en)

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