GB923183A - Improvements in and relating to indirectly-heated cathodes - Google Patents

Improvements in and relating to indirectly-heated cathodes

Info

Publication number
GB923183A
GB923183A GB13666/60A GB1366660A GB923183A GB 923183 A GB923183 A GB 923183A GB 13666/60 A GB13666/60 A GB 13666/60A GB 1366660 A GB1366660 A GB 1366660A GB 923183 A GB923183 A GB 923183A
Authority
GB
United Kingdom
Prior art keywords
cathode
filament
switch
voltage
rate
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
GB13666/60A
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.)
Varian Medical Systems Inc
Original Assignee
Eitel Mccullough Inc
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 Eitel Mccullough Inc filed Critical Eitel Mccullough Inc
Publication of GB923183A publication Critical patent/GB923183A/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
    • H01J1/22—Heaters
    • 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
    • H01J1/135—Circuit arrangements therefor, e.g. for temperature control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Solid Thermionic Cathode (AREA)
  • Microwave Tubes (AREA)

Abstract

923,183. Thermionic cathodes. EITELMcCULLOUGH Inc. April 19, 1960 [July 16, 1959], No. 13666/60. Class 39 (1). [Also in Group XI] In an electron tube comprising an indirectlyheated cathode 11, the heating filament 17 is caused to emit electrons and a time decreasing voltage is applied between the filament and cathode to cause time decreasing electron bombardment of the cathode, whereby the cathode is quickly raised to its emissive temperature. The filament may be a helix of thoriated tungsten or tungsten, with a carburized coating, arranged in a cylindrical cathode cup, Fig. 1 (not shown). As shown, a capacitor 23 is connected between filament and cathode, and is charged from a D.C. voltage source through a resistor 24 at a rate which approximates the rate at which the cathode loses heat during a cooling cycle, so that switch 31 may be omitted. Initially, switch 29 is in the position shown so that a relatively high voltage is applied across filament 17 causing electron emission. After 0.25 secs. the filament heating voltage is reduced, by movement of switch 29, to a value sufficient to maintain cathode 11 at its operating temperature, electron emission from the filament gradually ceasing.
GB13666/60A 1959-07-16 1960-04-19 Improvements in and relating to indirectly-heated cathodes Expired GB923183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US827598A US2996643A (en) 1959-07-16 1959-07-16 Art of heating electron tube cathodes

Publications (1)

Publication Number Publication Date
GB923183A true GB923183A (en) 1963-04-10

Family

ID=25249632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13666/60A Expired GB923183A (en) 1959-07-16 1960-04-19 Improvements in and relating to indirectly-heated cathodes

Country Status (5)

Country Link
US (1) US2996643A (en)
CH (1) CH366602A (en)
FR (1) FR1262893A (en)
GB (1) GB923183A (en)
NL (1) NL250741A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL268393A (en) * 1960-08-19
USRE32918E (en) * 1983-03-11 1989-05-09 Technion, Inc. Heater/emitter assembly
US4569198A (en) * 1983-03-11 1986-02-11 Technion, Incorporated Heater/emitter assembly
US4730449A (en) * 1983-07-26 1988-03-15 Technion, Inc. Radiation transfer thrusters for low thrust applications
US4675573A (en) * 1985-08-23 1987-06-23 Varian Associates, Inc. Method and apparatus for quickly heating a vacuum tube cathode
WO1988004468A1 (en) * 1986-12-12 1988-06-16 Hughes Aircraft Company Fast warm-up cathode arrangement
US5015908A (en) * 1989-01-23 1991-05-14 Varian Associates, Inc. Fast warm-up cathode for high power vacuum tubes
US7471035B2 (en) * 2003-08-21 2008-12-30 California Institute Of Technology Internal conductively-heated cathode
WO2008047269A2 (en) * 2006-10-17 2008-04-24 Philips Intellectual Property & Standards Gmbh Emitter for x-ray tubes and heating method therefore
RU2009133830A (en) * 2009-09-10 2011-03-20 Роман Станиславович Холошенко (RU) METHOD FOR ELECTRIC POWER STORAGE ACCORDING TO CREATION OF VOLUME CHARGE OF FREE ELECTRONS IN VACUUM AND VACUUM CAPACITOR FOR ITS IMPLEMENTATION
DE102016215378B4 (en) * 2016-08-17 2023-05-11 Siemens Healthcare Gmbh X-ray tube and an X-ray tube with the X-ray tube
DE102016215375B4 (en) * 2016-08-17 2023-01-26 Siemens Healthcare Gmbh Thermionic emission device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1787300A (en) * 1927-11-16 1930-12-30 Gen Electric Electric-discharge device
US1929369A (en) * 1931-09-30 1933-10-03 Gen Electric Electrical discharge device
US2509053A (en) * 1947-11-08 1950-05-23 Bell Telephone Labor Inc Space current device employing mutually bombarded electrodes
US2552047A (en) * 1949-04-19 1951-05-08 Rca Corp Electron discharge device with temperature-stabilized cathode
US2774916A (en) * 1951-06-09 1956-12-18 Siemens Ag Cathodes for electrical discharge devices

Also Published As

Publication number Publication date
NL250741A (en)
CH366602A (en) 1963-01-15
FR1262893A (en) 1961-06-05
US2996643A (en) 1961-08-15

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