US1874292A - Discharge apparatus - Google Patents

Discharge apparatus Download PDF

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Publication number
US1874292A
US1874292A US112280A US11228026A US1874292A US 1874292 A US1874292 A US 1874292A US 112280 A US112280 A US 112280A US 11228026 A US11228026 A US 11228026A US 1874292 A US1874292 A US 1874292A
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US
United States
Prior art keywords
cathode
anode
emission
electrons
influence
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 - Lifetime
Application number
US112280A
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English (en)
Inventor
Holst Gilles
Pol Balthasar Van Der
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US1874292A publication Critical patent/US1874292A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • 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

Definitions

  • This invention is based on the principle of subjecting the emission emanatin from a cathode to the influence of a space 0 arge due to an additional cathode whichis disposed within the same dischar e tube and is so arranged relatively to the rst mentioned cathode that the electrons emanating from it, in so far as they do not strike intermediate electrodes, constitute a so-called cloud on re versal of their direction of movement adj acent the first mentioned cathode.
  • a grid is arranged which serves as an anode for both cathodes, it can be ensured that at an increasing potential difference between the anode on the one hand and the cathode on the other hand the hindering influence exercised by the space charge of the outermost cathode on the emission of the innermost one is more intense than the influence of the increase of the anode potential on the said emission; In these circumstances the-current flowing from the anode to the innermost cathode decreases consequently at an increasing potential difterence between the said two elements so that the device can operate with a negative resistance characteristic and can be used for generating oscillations.
  • the device according to the invention comprises an exhausted bulb in which are concentrically arranged a central incandescent cathode, a grid-shaped anode and an enveloping cathode.
  • this latter cathode is moreover preferably constructed as an equipotential cathode.
  • Figure 1 shows diagrammatically a method of arranging the electrodes according to the invention.
  • Figure 2 shows in vertical section a socalled stem provided with electrodes arranged as shown in Figure 1.
  • a central incandescent Cathdde 1 which is shown in the form of a'wire is surrounded by an; anode 2 which is perforated or 1 otherwise provided-with apertures.
  • the said a anode may 'consist,wforexample,- in the manner known for grids, of a 'helically wound metal "wire as shown in Figure Around the'ex terior of the anode 2is' mounteda secondelec tron emitting cathode3.
  • the latter may con sist, for example, 'likewise. of a -helically wound Wire heated by the passage ofa current.”
  • a socalled equipotential cathode should be employed in order toprevent'considerable voltage differences between the starting point and the "final point of the said cathode. 1
  • "Thus a 'continuouacloud of electrons is maintained :by. the cathode 3 around the cathode 1, said cloud “intensifying the-space charge at the cathode 1 and thus counter-acting the emission of'the cathode 1..
  • the incandescent cathode 1 is stretched between two pole wires 4 which are sealed in known manner in a glass stem 5.
  • the anode 2 consists of a helically wound wire having its turns secured to a small carrying rod 6 which merges into supports 7 sealed in the stem 5.
  • the outermost cathode 3 consists of an open cylinder which is coated on its inner side with an active layer (for example an alkaline earth oxide) and which is secured'in the stem 5 by a carrier 8.
  • the heating is efiected by means of, a resistance wire 9 wound around the said cylinder and insulated therefrom by the insulation Hand to which'current can be supplied by wires 10 which are also led outwardly through the stem 5.
  • the glass en- ;ielope 16 encloses the entire electrode assemya Obviously it'is possible byregulating the temperatures of the two cathodes to intensify the effect in view by providing that at a given potential of the anode 2 a state of saturation has already occurred in the emission at the cathode 1 but not at the cathode 3.
  • An electron discharge device comprising a I source of primary electrons, a second source of primary electrons mounted concentrically about the first source, and means concentric with and intermediate these two sources of primary electrons for attracting the electrons from said sources, said means being apertured and positioned withrespect to the two sources for passing electrons from one source through the apertures and thereby afiecting the eIIllSSlOIl of electrons from the other source. 7 V

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  • Discharge Lamp (AREA)
US112280A 1925-08-15 1926-05-28 Discharge apparatus Expired - Lifetime US1874292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1874292X 1925-08-15

Publications (1)

Publication Number Publication Date
US1874292A true US1874292A (en) 1932-08-30

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ID=19873223

Family Applications (1)

Application Number Title Priority Date Filing Date
US112280A Expired - Lifetime US1874292A (en) 1925-08-15 1926-05-28 Discharge apparatus

Country Status (2)

Country Link
US (1) US1874292A (enrdf_load_stackoverflow)
NL (1) NL17509C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152276A (en) * 1960-09-08 1964-10-06 Philips Corp Electron tube having coaxial terminals for an interiorly emissive cathode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152276A (en) * 1960-09-08 1964-10-06 Philips Corp Electron tube having coaxial terminals for an interiorly emissive cathode

Also Published As

Publication number Publication date
NL17509C (enrdf_load_stackoverflow)

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