GB875487A - Improvements in cold-cathode stepping tubes - Google Patents

Improvements in cold-cathode stepping tubes

Info

Publication number
GB875487A
GB875487A GB2375457A GB2375457A GB875487A GB 875487 A GB875487 A GB 875487A GB 2375457 A GB2375457 A GB 2375457A GB 2375457 A GB2375457 A GB 2375457A GB 875487 A GB875487 A GB 875487A
Authority
GB
United Kingdom
Prior art keywords
electrode
cathode
cathodes
outer electrodes
marker
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
GB2375457A
Inventor
Gerald Offley Crowther
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB2375457A priority Critical patent/GB875487A/en
Publication of GB875487A publication Critical patent/GB875487A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/007—Sequential discharge tubes

Landscapes

  • Gas-Filled Discharge Tubes (AREA)

Abstract

875,487. Multi-gap cold-cathode tubes. MULLARD Ltd. May 7, 1958 [July 26, 1957], No. 23754/57. Class 39(1). In a cold-cathode stepping tube as described in Specification 875,484 comprising a central disc-shaped electrode surrounded by a circular row of rod-shaped outer electrodes and at least one marker electrode so arranged that the breakdown voltage between the central electrode and the marker electrode is greater than that between the central electrode and the said outer electrodes, the said marker electrode is positioned a greater distance from the central electrode than-are any of the said outer electrodes and has a discharge surface so disposed that a first portion of the said surface is nearer to a first selected one of said outer electrodes than to any other electrode and a second portion of the said surface is nearer to a second selected one of said outer electrodes than to any other electrode. In one arrangement, Figs. 3 and 6, the tube comprises a central circular anode (not 'shown) surrounded by a circular row of main cathodes and first and second guide cathodes of which only first guide cathodes GA 9 , GA 0 , and second guide cathode GB 9 are shown. The marker or zero main cathode K 0 is disposed outside the circular row of cathodes and comprises two portions 1 and 2 each having a configuration similar to the other guides and cathodes, which portions are connected together, e.g. by a spot weld 8 below a ceramicspacer S. Portion 1 of K 0 is much nearer to GB 9 than to GA 9 so that the negative voltage to which K 0 must be returned when operating the tube is as uncritical as possible. Portion 2 of K 0 is spaced from GA 0 by the normal spacing between the electrodes in the circular row, so the tube is stable in use. Figs. 7 and 8 show alternative forms of the zero cathode K 0 . In Fig. 7 the L-shaped cathode has a vertical portion 4 and a horizontal portion 3 extending towards the electrode GB 9 . In Fig. 8 the cathode comprises a vertical rod 6 to which is welded a plate 5 which extends towards GB 9 .
GB2375457A 1957-07-26 1957-07-26 Improvements in cold-cathode stepping tubes Expired GB875487A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2375457A GB875487A (en) 1957-07-26 1957-07-26 Improvements in cold-cathode stepping tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2375457A GB875487A (en) 1957-07-26 1957-07-26 Improvements in cold-cathode stepping tubes

Publications (1)

Publication Number Publication Date
GB875487A true GB875487A (en) 1961-08-23

Family

ID=10200773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2375457A Expired GB875487A (en) 1957-07-26 1957-07-26 Improvements in cold-cathode stepping tubes

Country Status (1)

Country Link
GB (1) GB875487A (en)

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