GB542495A - Improvements in thermionic cathode structures for electric discharge devices - Google Patents

Improvements in thermionic cathode structures for electric discharge devices

Info

Publication number
GB542495A
GB542495A GB11440/40A GB1144040A GB542495A GB 542495 A GB542495 A GB 542495A GB 11440/40 A GB11440/40 A GB 11440/40A GB 1144040 A GB1144040 A GB 1144040A GB 542495 A GB542495 A GB 542495A
Authority
GB
United Kingdom
Prior art keywords
ribbon
july
plane
cathode
electric discharge
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
GB11440/40A
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 GB542495A publication Critical patent/GB542495A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens
    • H01J17/06—Cathodes
    • H01J17/063—Indirectly heated cathodes, e.g. by the discharge itself

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Details Of Valves (AREA)
  • Discharge Lamp (AREA)

Abstract

542,495. Thermionic valves. BRITISH THOMSON-HOUSTON CO., Ltd. July 9, 1940, No. 11440. Convention date, July 11, 1939. Addition to 536,070. [Class 39 (i)] The equipotential cathodes of heavy duty rectifiers &c. comprise a ribbon wound in zig-zag formation about pins 8, 9 projecting radially from metal rings 2, 3 held in axially spaced relation by rods 4...7. The ribbon may be plane or crimped and may be formed of or covered by gauze to assist retention of the activating material. The ribbon structure may be twisted or otherwise modified in shape. A heating filament is mounted in the space enclosed by the cathode structure, which is enclosed in a heat shield consisting of two concentric metal cylinders, between which are located a plurality of layers of loosely spaced metal foil as described in the parent Specification, and having a closed cover at the bottom and an apertured plate at the top. The shield may be insulated from or electrically connected through a high resistance e.g. 1,000 ohms to the cathode. The application described is to a rectifier having a filling of mercury with a pressure of 6-24 microns at the operating temperature of 40-60‹ C. The Specification as open to inspection under Sect. 91 comprises also the alternative construction in which the ribbon is made up of a number of filaments arranged side by side in a plane. This subject-matter does not appear in the Specification as accepted.
GB11440/40A 1938-11-30 1940-07-09 Improvements in thermionic cathode structures for electric discharge devices Expired GB542495A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US243101A US2201731A (en) 1938-11-30 1938-11-30 Discharge tube electrode assembly
US261395A US2201720A (en) 1938-11-30 1939-03-11 Thermionic cathode structure
US266803A US2246176A (en) 1938-11-30 1939-04-08 Thermionic discharge device
US283803A US2201721A (en) 1938-11-30 1939-07-11 Thermionic cathode structure

Publications (1)

Publication Number Publication Date
GB542495A true GB542495A (en) 1942-01-12

Family

ID=42358497

Family Applications (2)

Application Number Title Priority Date Filing Date
GB31133/39A Expired GB536070A (en) 1938-11-30 1939-11-30 Improvements in and relating to thermionic discharge devices
GB11440/40A Expired GB542495A (en) 1938-11-30 1940-07-09 Improvements in thermionic cathode structures for electric discharge devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB31133/39A Expired GB536070A (en) 1938-11-30 1939-11-30 Improvements in and relating to thermionic discharge devices

Country Status (5)

Country Link
US (4) US2201731A (en)
BE (1) BE438749A (en)
FR (2) FR861969A (en)
GB (2) GB536070A (en)
NL (1) NL55022C (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE477491A (en) * 1943-05-28
US2456649A (en) * 1943-06-12 1948-12-21 Glenn F Rouse Cathode
US2675498A (en) * 1948-12-07 1954-04-13 Raytheon Mfg Co Cathode for electron discharge devices
US2605432A (en) * 1949-10-19 1952-07-29 Electrons Inc Indirectly heated cathode structure
US2647216A (en) * 1950-04-01 1953-07-28 Rca Corp Dispenser cathode
US2610305A (en) * 1951-01-05 1952-09-09 Chatham Electronics Corp Control electrode for discharge tubes
DE962188C (en) * 1951-10-12 1957-04-18 Philips Nv Electric discharge tubes with mercury cathode and gas filling
DE1018164B (en) * 1952-12-04 1957-10-24 Siemens Ag Gas discharge tubes
GB931059A (en) * 1961-02-10 1963-07-10 Thorn Electrical Ind Ltd Improvements in and relating to thermionic cathodes
NL141698B (en) * 1964-12-10 1974-03-15 Philips Nv INDIRECTLY HEATED CATHOD FOR AN ELECTRIC DISCHARGE TUBE.
GB1204316A (en) * 1966-09-26 1970-09-03 Atomic Energy Authority Uk Improvements in or relating to electron emitting cathodes for irradiation machines
US3534218A (en) * 1967-03-30 1970-10-13 Atomic Energy Authority Uk Electron emitting cathodes for irradiation machines
US4611147A (en) * 1984-04-05 1986-09-09 The United States Of America As Represented By The United States Department Of Energy Thermionic gas switch

Also Published As

Publication number Publication date
FR861969A (en) 1941-02-22
GB536070A (en) 1941-05-01
BE438749A (en) 1940-10-31
NL55022C (en) 1943-08-16
US2201721A (en) 1940-05-21
US2201720A (en) 1940-05-21
US2201731A (en) 1940-05-21
FR51138E (en) 1941-08-08
US2246176A (en) 1941-06-17

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