GB1209078A - Improvements in or relating to thermionic dispenser cathodes - Google Patents

Improvements in or relating to thermionic dispenser cathodes

Info

Publication number
GB1209078A
GB1209078A GB06923/68A GB1692368A GB1209078A GB 1209078 A GB1209078 A GB 1209078A GB 06923/68 A GB06923/68 A GB 06923/68A GB 1692368 A GB1692368 A GB 1692368A GB 1209078 A GB1209078 A GB 1209078A
Authority
GB
United Kingdom
Prior art keywords
supply chamber
heater
cathode
cylinder
sheath
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
GB06923/68A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1209078A publication Critical patent/GB1209078A/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
    • H01J1/24—Insulating layer or body located between heater and emissive material
    • 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

  • Solid Thermionic Cathode (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Physical Vapour Deposition (AREA)
  • Cookers (AREA)

Abstract

1,209,078. Thermionic cathode constructions. SIEMENS A.G. 9 April, 1968 [10 April, 1967], No. 16923/68. Heading H1D. A dispenser cathode comprises a porous emissive-substance carrier plate 3 which closes off the end of the supply chamber 1 provided with a heater 4 housed in a cylindrical ceramic oxide sheath 5 which is attached to the supply chamber 1 and which is surrounded by a spaced metal foil supporting cylinder 6 also attached to the supply chamber 1. The heater may be of the bifilar spiral type or a single filament spiral having one end connected directly to the supply chamber, and in the latter case an additional metal cylinder connected to the supply chamber may be provided between the ceramic sheath 5 and cylinder 6 to act as a supply lead for the heater. The ceramic sheath 5 may be of aluminium oxide or beryllium oxide and the supporting cylinder 6 of tantalum. The dispenser cathode may be incorporated in a travelling wave tube or disc-seal tube, and may be operated with a D.C. heater current source or with A.C. heater current source exhibiting a D.C. bias with respect to the cathode.
GB06923/68A 1967-04-10 1968-04-09 Improvements in or relating to thermionic dispenser cathodes Expired GB1209078A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0109263 1967-04-10

Publications (1)

Publication Number Publication Date
GB1209078A true GB1209078A (en) 1970-10-14

Family

ID=7529393

Family Applications (1)

Application Number Title Priority Date Filing Date
GB06923/68A Expired GB1209078A (en) 1967-04-10 1968-04-09 Improvements in or relating to thermionic dispenser cathodes

Country Status (5)

Country Link
US (1) US3495121A (en)
DE (1) DE1614495B1 (en)
FR (1) FR1559501A (en)
GB (1) GB1209078A (en)
NL (1) NL6800951A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268325A (en) * 1992-07-01 1994-01-05 Thorn Emi Electronics Ltd Thermionic cathode structure.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404362B1 (en) * 1974-01-30 1975-07-31 Standard Elektrik Lorenz Ag, 7000 Stuttgart Radiator for an indirectly heated cathode
US3883767A (en) * 1974-02-08 1975-05-13 Gte Sylvania Inc Heater for fast warmup cathode
DE2603341C2 (en) * 1976-01-29 1984-03-15 Siemens AG, 1000 Berlin und 8000 München Rotationally symmetrical electron gun and use for high-performance traveling field tubes
FR2621735A1 (en) * 1987-10-09 1989-04-14 Thomson Csf ROBUST OXIDE CATHODE FOR CATHODE RAY TUBE
KR0147542B1 (en) * 1989-12-31 1998-08-01 김정배 Impregnated cathode for electron tube
US20030025435A1 (en) * 1999-11-24 2003-02-06 Vancil Bernard K. Reservoir dispenser cathode and method of manufacture
US20110140074A1 (en) * 2009-12-16 2011-06-16 Los Alamos National Security, Llc Room temperature dispenser photocathode

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE514709A (en) * 1951-10-13
NL103155C (en) * 1958-06-19 1900-01-01
NL101694C (en) * 1959-03-06
US3421039A (en) * 1966-01-03 1969-01-07 Hughes Aircraft Co Thermionic cathode having emissive material and metallic paths which sputter away at the same rate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268325A (en) * 1992-07-01 1994-01-05 Thorn Emi Electronics Ltd Thermionic cathode structure.
GB2268325B (en) * 1992-07-01 1996-01-03 Thorn Emi Electronics Ltd Thermionic cathode structure

Also Published As

Publication number Publication date
US3495121A (en) 1970-02-10
FR1559501A (en) 1969-01-27
NL6800951A (en) 1968-10-11
DE1614495B1 (en) 1971-03-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees