US2144998A - Combined glow cathode and acceleration diaphragm - Google Patents

Combined glow cathode and acceleration diaphragm Download PDF

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Publication number
US2144998A
US2144998A US102095A US10209536A US2144998A US 2144998 A US2144998 A US 2144998A US 102095 A US102095 A US 102095A US 10209536 A US10209536 A US 10209536A US 2144998 A US2144998 A US 2144998A
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United States
Prior art keywords
emitter
electrode
resistance
cathode
diaphragm
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Expired - Lifetime
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US102095A
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English (en)
Inventor
Treschau Edwin
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AEG AG
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AEG AG
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Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes

Definitions

  • the Braun high-vacuum tube presents, in comparison to. the gas-filled tube, besides important advantages, such as the absolute absence of inertia of the ray and the good linearity of the scale, also a perceptible disadvantage consisting of a lower intensity of the luminous spot.
  • the reduction of the beam intensity of high-vacuum tubes, as due to the absence of the positive space charge in front of the cathode, is obviated by arranging upon the cathode, with the aid of a heat-proof body, a ⁇ space-charging diaphragm charged positively relatively to the cathode. It is, with this arrangement, not necessary to provide a separate voltage supply to this space-charging diaphragm, the drop of potential of the glowing wire or cathode heater can be used to render the diaphragm sufficiently positive relatively to the cathode.
  • the requisite positive potential of the space-charging diaphragm can be produced also by making it of a material possessing a suitable contact-potential difference relatively to the material of the cathode.
  • the cathode and the spacecharging diaphragm should, as regards their shape and size, be so designed that a collective or focusing eifect is attained so as to cause, if possible, all escaping electrons to take their way through the aperture of the diaphragm that is reproduced upon the screen in the form of a luminous spot of high intensity by means of a suitable electronic-optical system.
  • the eifect to concentrate as many electrons as possible upon the aperture of the diaphragm can be assisted by the magnetic field produced by a thick-wire coil through which the heating current passes and which because of its size as compared to the cathode heater wire, is not heated to a high temperature.
  • the fluctuation of intensity arising when heating with alternating current can be utilized advantageously, when making use of the arrangement constituting the present invention, for investigating phenomena of unknown frequency the fluctuating intensity being employed as a time marking.
  • l denotes the diaphragm, 2 an insulating body and 3 the glow-cathode.
  • the voltage of the space-charging diaphragm with respect to the cathode 2 is attained with the aid of the drop of potential along the cathode heater or filament.
  • the aperture of the diaphragm is surrounded with a thick-wire coil 4 through which the heating current passes.
  • the cathode and the diaphragm may have any other suitable shape than that shown on the drawing merely by way of example, and especially the diaphragm need not, by necessity, have conical shape.
  • the insulating body need not necessarily be shoved upon the cathode since under certain circumstances the space charge diaphragm can be independently supported by appropriate support means,
  • a high vacuum electron discharge tube comprising an electron emitter, electrical resistance means adapted to supply heat to the emitter, an electrode positioned adjacent the emitter and. means whereby the potential drop along said resistance may be utilized, to maintain said electrode at a potential slightly positive with respect to the emitter whereby the negative space charge caused by electrons leaving the emitter may be compensated.
  • a high vacuum electron discharge tube comprising an electron emitter, electrical resistance means adapted to supply heat to the emitter, an electrode, insulating means for positioning the electrode adjacent the emitter and means whereby the potential drop along said resistance may be utilized to maintain said electrode slightly positive with respect to the emitter in order to compensate the negative space charge caused by electrons leaving the emitter.
  • a high vacuum electron discharge tube comprising an electron emitter, resistance means adapted to be electrically heated by direct current to supply heat to said emitter, an electrode positioned adjacent the emitter, means to connect said emitter to the negative terminal of said resistance, and means to connect said electrode to the positive terminal of said resistance to maintainsaid electrode positive with respect to said emitter whereby the negative space charge, caused by electrons leaving the emitter will be drop along said resistance whereby the negative I space charge caused by electrons leaving the emitter will be compensated.
  • a cathode ray tube comprising an electron" emitter, aresistance for, supplying heat to the emitter and an electrode, means for connecting one end of said resistance to said emitter, means;
  • An electron discharge tube comprising an emitter, a resistance for supplying heat to said emitter, a magnetic coil surrounding said emitter and an electrode, means for connecting one end of said resistance to said emitter, means for connecting the other end of said resistance to one end of said coil, means for connecting the other end of said coil to said electrode and means for applying a positive and a negative potential to said electrode and said emitter, respectively, whereby the electrode and its potential relativeto the emitterwill compensate, for the negative space charge caused by electrons leaving the emitter.
  • An electron discharge tube comprising an emitter, a resistance for supplying heat to said emitter, a magnetic coil surrounding said emitter and an electrode, means for connecting one end of said resistance to said emitter, means for conmeeting the other end'of said resistance'to one I end of said coil, means for connecting the other end of said coil to said electrodeand means for applying a positive and a negative potential to said electrode and said emitter, respectively,
  • An electron discharge tube comprising an emitter, an electrical resistance for. supplying heat to said emittena magnetic coil surrounding said, emitter and an electrode, means for connectingone end of said resistance to said emitter, means for connecting the other end of said resistance to one end of said coil, means for connecting the other end of said coil .to said electrode, and means for applying a potential to said electrode and emitter, whereby the electrode may assume a potential different from. the potential of the emitter to'compensate for the negative space charge caused by electrons leaving the emitter. T V v v EDWIN TRESCHAU.

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  • Electron Sources, Ion Sources (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US102095A 1935-09-25 1936-09-23 Combined glow cathode and acceleration diaphragm Expired - Lifetime US2144998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA77152D DE704848C (de) 1935-09-25 1935-09-25 Gluehkathode mit dicht vor der Kathode angeordneter Raumladungsblende fuer Kathodenstrahlroehren

Publications (1)

Publication Number Publication Date
US2144998A true US2144998A (en) 1939-01-24

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ID=27770681

Family Applications (1)

Application Number Title Priority Date Filing Date
US102095A Expired - Lifetime US2144998A (en) 1935-09-25 1936-09-23 Combined glow cathode and acceleration diaphragm

Country Status (4)

Country Link
US (1) US2144998A (de)
AT (1) AT150573B (de)
DE (1) DE704848C (de)
FR (1) FR810980A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886729A (en) * 1953-10-08 1959-05-12 Du Mont Allen B Lab Inc Grid-cathode structure for cathode ray tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886729A (en) * 1953-10-08 1959-05-12 Du Mont Allen B Lab Inc Grid-cathode structure for cathode ray tubes

Also Published As

Publication number Publication date
AT150573B (de) 1937-09-10
DE704848C (de) 1941-04-08
FR810980A (fr) 1937-04-03

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