GB767718A - "improvements relating to electron emissive cathodes" - Google Patents

"improvements relating to electron emissive cathodes"

Info

Publication number
GB767718A
GB767718A GB3066953A GB3066953A GB767718A GB 767718 A GB767718 A GB 767718A GB 3066953 A GB3066953 A GB 3066953A GB 3066953 A GB3066953 A GB 3066953A GB 767718 A GB767718 A GB 767718A
Authority
GB
United Kingdom
Prior art keywords
block
screen
nov
improvements relating
electron emissive
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
GB3066953A
Inventor
John Heywood Ludlow
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical 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
Priority claimed from GB2708052A external-priority patent/GB733191A/en
Application filed by Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB3066953A priority Critical patent/GB767718A/en
Publication of GB767718A publication Critical patent/GB767718A/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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

767,718. Thermionic cathode constructions. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Nov. 19, 1954 [Nov. 5, 1953], No. 30669/53. Class 39(1). A cathode comprises a block 3 of porous metal impregnated with emissive material, with a heater 4 parallel to and spaced from the back surface of the block, and adapted to heat it by electron bombardment ; a refractory screen 6 in good thermal contact with the said surface prevents rearward emission. The screen is preferably molybdenum, and may have a backward extension 6b, and a forward extension 6a which contains the emissive block. Instead of being a separate member, the screen may be deposited on the back of the block. Specifications 707,096 and 733,191 are referred to.
GB3066953A 1952-10-28 1953-11-05 "improvements relating to electron emissive cathodes" Expired GB767718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3066953A GB767718A (en) 1952-10-28 1953-11-05 "improvements relating to electron emissive cathodes"

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2708052A GB733191A (en) 1952-10-28 1952-10-28 Improvements relating to cathodes for electron emissive devices
GB3066953A GB767718A (en) 1952-10-28 1953-11-05 "improvements relating to electron emissive cathodes"

Publications (1)

Publication Number Publication Date
GB767718A true GB767718A (en) 1957-02-06

Family

ID=26258618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3066953A Expired GB767718A (en) 1952-10-28 1953-11-05 "improvements relating to electron emissive cathodes"

Country Status (1)

Country Link
GB (1) GB767718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009261A1 (en) * 1978-09-27 1980-04-02 Siemens Aktiengesellschaft Storage cathode, particularly metal capillary cathode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0009261A1 (en) * 1978-09-27 1980-04-02 Siemens Aktiengesellschaft Storage cathode, particularly metal capillary cathode

Similar Documents

Publication Publication Date Title
GB745441A (en) Improvements in or relating to sources of ions
GB495843A (en) Electron multipliers
GB441250A (en) Improvements in and relating to oxide coated cathodes for gaseous electric discharge devices
GB767718A (en) "improvements relating to electron emissive cathodes"
GB594338A (en) Photo-electric electron multiplier
GB1454196A (en) Electron beam apparatus
GB857090A (en) Improvements in or relating to thermionic dispenser cathodes
GB762023A (en) Improvements in or relating to electron tubes of the crossed-fields type
GB701871A (en) Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes
US2686886A (en) Electric discharge tube
GB629881A (en) Improvements in electric discharge tubes comprising secondary emission electrodes
GB738120A (en) Secondary emitting electrode
GB829339A (en) Improvements in or relating to equipotential cathodes for electric discharge tubes and discharge tubes containing such cathodes
GB776907A (en) Improvements in or relating to thermionic cathodes
GB499649A (en) Improvements in or relating to electron multipliers
FR2411483A1 (en) Oxide cathode with powder metallurgical nickel support - contg. reducing agent in inlets on surface is resistant to poisoning (BE 5.6.79)
SU348122A1 (en) Thermoelectronic emitter for centimeter range magnetron
GB733191A (en) Improvements relating to cathodes for electron emissive devices
GB515525A (en) Improvements in or relating to electron multipliers
GB922112A (en) Improvements in or relating to devices comprising a cathode-ray tube
US2189973A (en) Electron discharge device
GB749256A (en) Improvements in or relating to cathodes for electron discharge devices
JPS5796450A (en) Electron gun
Beese Thermionic Emission of Oxide Coated Cathodes Containing a Ni-Ba Alloy Core
GB744776A (en) Improvements in or relating to cathode-ray tubes