US1737224A - Electric discharge-tube system - Google Patents

Electric discharge-tube system Download PDF

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Publication number
US1737224A
US1737224A US1072A US107225A US1737224A US 1737224 A US1737224 A US 1737224A US 1072 A US1072 A US 1072A US 107225 A US107225 A US 107225A US 1737224 A US1737224 A US 1737224A
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US
United States
Prior art keywords
foregrid
circuit
resistance
grid
current
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
US1072A
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English (en)
Inventor
Dijksterhuis Popko Reinder
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
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Publication of US1737224A publication Critical patent/US1737224A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B7/00—Generation of oscillations using active element having a negative resistance between two of its electrodes
    • H03B7/02—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance
    • H03B7/04—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance active element being vacuum tube

Definitions

  • This invention relates to an installation for operating an electric discharge tube comprising an'incandescent cathode, an anode, a controlling grid, and aso-called foregrid.
  • a foregrid is to be understood to mean an auxiliary electrode having some apertures and arranged between the cathode and the to connect the installation for operating such a discharge tube so as to be suitable for generating, receiving,or amplifying electric oscillations without making use of a retroaction coil.
  • This property isutilized in order to obtain an installation-comprising a circuit in which a negative resistance occurs.
  • an ohmic resistance is provided which pertains toiboth the current circuits formed betweenthe incandescent cathode and the controlling gri'drand between the incandescent cathode and the foregrid.
  • the foregrid has preferably substantially the same potential as the anode.
  • one end of the resistance is electrically connected to the incandescent cathode whereas the other end is electrically connected to the foregrid and through a battery to the controlling grid.
  • the resistance is preferably non-inductive tuations have the Same Phase as the fitand is adjustable so that the voltage applied or voltage variations at the grid (that is to say :The anode current increases as the grid. tension increases and vice versa)
  • discharge tubes comprising a foregrid which has a positive potential relative to the v cathode, preferably a potential correspondving to that, of the anode, the anode current fluctuationsare in a certain region in phase Wlth the tension or voltage fluctuations at the-grid.
  • the foregrid current fluctuations 5 are however in v opposite'phase therewith,
  • Eto the control grid and the foregrid maybe varied. It is also advantageous to provide batteries for the anode and foregrid such that. the potential applied by either or both tothe respective electrodes my be varied.
  • the electric discharge tube shown in Figure 1 consists of an envelopev 1 of glass or similar material, in whichanincandescent cathode 2, a foregrid 3, a' controlling grid 4, and an anode 5 are arranged.
  • p p L The envelope 1 maybe exh: usted to a high degree or may contain a suitable gaseous fill I In, thevaccornpanying drawings, Figure 1 ingat-low pressure; may forexample be filled with a rare gas, preferably with argon having a pressure of 100 microns or less.
  • the incandescent cathode 2 is heated to the required temperature by a battery 6 while the anode circuit is provided with a battery 11 and a telephone 12.
  • the foregrid 3 is likewise -connected to the battery 11 with the interposition of a regulable resistance 10 and the controlling grid 4 s connected to the resistance 10 via a-secondary coil 8 of a transformer 8,
  • the resistance 10 pertains to the foregrid circuit as well as to the controlling grid circuit while the resistance is electrically connected to the incandescent cathode and to the two grids.
  • Thevalue of the resistance 10 is substantially equal to the absolute value of the negative resistance in the circuits which is common to the two grids so that the total resistance in, this circuit approximates 0.
  • the installation according to the invention is plainer than the one usually used heretofore, because a retroaction coil has become useless; it may be ap lied to the generation, reception and amplification of oscillations, more particularly to the reception or amplification of oscillations of high or low frequency and ofi'ers in some cases the advantage of an easier adjustment than the usual retroaction circuit arrangements.
  • the amplifying is limited on account of the total current which leaves the cathode, being able to rise only to acertain value, namely, to the saturation current.
  • the resistance 10 is preferably free of induction as otherwise the current fluctuations in the foregrid circuit are not accurately in phase with the tension fluctuations at the controlling grid.
  • a discharge tube relay having a cathode, plate and two grids, a plate circuit comprising a source of positive plate potential, a foregrid circuit comprising said source of plate potential and a resistance, and a control grid circuit comprising said source of plate potential, said resistance, a source of negative potential, and aninput means.
  • a discharge tube relay having a cathode, plate and two grids, a plate circuit comprising a source of positive plate potential, 3, fore I grid circuit comprising a resistance and a source of potential substantially equal to that of the plate, and a control grid circuit comprising said source of foregrid potential, said resistance, a source of negative'potential, and an input means.
  • a discharge tube relay having a cathode, plate and two grids, a plate circuit comprising a source of positive plate potential, a foregrid circuit. comprising said source of plate potential and an adjustable resistance, and a control grid circuit comprising said source of plate potential, said resistance, a source of negative potential, and an input means.

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US1072A 1924-02-09 1925-01-07 Electric discharge-tube system Expired - Lifetime US1737224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL228935X 1924-02-09

Publications (1)

Publication Number Publication Date
US1737224A true US1737224A (en) 1929-11-26

Family

ID=19779813

Family Applications (1)

Application Number Title Priority Date Filing Date
US1072A Expired - Lifetime US1737224A (en) 1924-02-09 1925-01-07 Electric discharge-tube system

Country Status (4)

Country Link
US (1) US1737224A (enEXAMPLES)
FR (1) FR591771A (enEXAMPLES)
GB (1) GB228935A (enEXAMPLES)
NL (1) NL16089C (enEXAMPLES)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616040A (en) * 1948-09-24 1952-10-28 Rca Corp Electrical system for prolonging life of coated cathodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616040A (en) * 1948-09-24 1952-10-28 Rca Corp Electrical system for prolonging life of coated cathodes

Also Published As

Publication number Publication date
GB228935A (en) 1925-06-04
NL16089C (enEXAMPLES)
FR591771A (fr) 1925-07-17

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