US2004790A - Electron discharge device - Google Patents

Electron discharge device Download PDF

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Publication number
US2004790A
US2004790A US670556A US67055633A US2004790A US 2004790 A US2004790 A US 2004790A US 670556 A US670556 A US 670556A US 67055633 A US67055633 A US 67055633A US 2004790 A US2004790 A US 2004790A
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US
United States
Prior art keywords
cathode
anode
control member
tube
circuit
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
US670556A
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English (en)
Inventor
Friedrich W Hehlgans
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2004790A publication Critical patent/US2004790A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H04N5/68—Circuit details for cathode-ray display tubes
    • 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
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation

Definitions

  • the invention relates :to neared n discharge devices, suchas cathode-raytubes,- employed for the purposes-of sound recording, televisionyetc;
  • An object or the present invention is to provide f a circuit arrangement and apparatus for increas ing by regenerative action, the electrical impulses i applied to the cathode-.rayt'ube whereby the light output and control of the tubeare enhanced.
  • the invention is ,based on thefollowing p1in-- ciple: If alternating :current voltagesare applied and a telephone receiveris connected in the anode circuit of the tube, electric impulses of considerable strength arefound :to exist inthe anode circuit; These impulsesrepresent a faithfulreproduction, in amplifiediorm, of the voltages applied to the control cylinder; I i i I I, In accordance with .thepresent invention; this principle is employed for increasing the-light output of the cathoderay tube in suchxa manner that theoscillations occurring in the anode cir-' cuit of the tube are appliedtothe control circuit of. the tube in such phase as toradd'to the original alternating current voltage. 'I'heinventi'on Will be better understood when reierenceflis made to thefollowing description and. the accompany-- ing drawing in which Fig.1 shows diagrammati c'ally'a, system embodyingthe invention and-Fig. 2
  • numeral l designates a: microphone transmitter connectedin'serieswith an ei'iergiz'ing battery 2 ,andthe primary ofgatraLnsformert.
  • the secondaryiwoi the. transformer is connected to theinput circuit of a thermionic amplifier 4 of ordinary construction; amplifier includes an electrostatic control member 5, a filamentary cathode 6 and an anode I.
  • the filament and the anode are connected to difierent potential taps on a common battery 8 or other source of potential.
  • the control member 5 is connected to the negative end of the battery in such a manner as to obtain a constant negative bias.
  • the output circuit of the amplifier 4 is connected to the control circuit of a cathode-ray tube 9 by means of a well-known capacity and resistance coupling consisting of a capacitor 1' and resistances II and I2. If desired, an inductive or transformer coupling may beused.
  • the cathode-ray tube is of ordinary type and includes a cathode IS, a control electrode or Wehnelt cylinder 14 and an anode l5 in the form A 01' a circular plate of metal provided with a central aperture It for the cathode rays.
  • a 01' a circular plate of metal provided with a central aperture It for the cathode rays.
  • the control member of the resistance [9.
  • the purpose of the cathode r'ay tube is to translate the electricalundulations applied to the cylinder 14 into light images Which are photographical-1yreproduced-on the sound'recordl8.
  • a regenerative circuit isprovided between the anodeand control electrode circuits of the cathode-ray tube orderto increase the control exercised by the cylinder M'on the electron beam striking the fluorescent'screen-H; increased control of the intensity of the light spotand of the photographic image on the soundtrack l8'is obtained.
  • this regenerative effect is produced bymeansof a back-coupling through a conductor 20 connected to a point in-the'anode circuit between the anode 15* and the resistance l9.
  • This conductor has in series therewitha capacitor 2 ⁇ , fixed or adjustable, also a resistance 22: whichis connected to a point between the secondary winding of the transformer: Send an adjustable resistance 23 inserted in the control circuit of the amplifier 4.
  • the relative magnitude of the resistances 22 and 23 determines the voltageincrement which is applied to the input of the amplifier 4 and hence, provides an adjustment of the increased voltage impressed on the control member of the cathode-ray tube.
  • an additional electrode may be arranged between the cathode and the Wehnelt cylinder of the cathode-ray tube and the regenerative voltage taken from the circuit which includes this auxiliary electrode.
  • Fig. 2 shows such 'a system.
  • v L V As illustrated in Fig. 2, the microphone transmitter l is connected in the local circuit and pro:
  • an electrode 24 having a central aperture 25 in line with the opening in the cylinder 4, and the aperture IS in the anode Hi.
  • the electrode 24 is connected through the current-limiting resistance 26 to an intermediate positive terminal on'the common battery or source ofenergy supply 8.
  • a regenerative coupling is connected between the electrode M and the inputcircuit 0f the cathode-ray tube through a capacitor 2
  • an inductive coupling may be used but the capacity coupling is preferred since it is more free from resonance efiects, and selfexcitation within the cathode-ray tubeis thereby avoided.
  • the capacitor 2 l 1 is replacedby an inductive coupling, the production of selfsustained oscillations may be substantially reduced by a Proper adjustment of the resistances 22, 23 and the proper choice of the: voltages employed in the system. y a
  • a cathode-ray tube for translating electrical impulses into light rays, said tube including a cathode, an anode, an electrostatic control member and a screen adapted to fluoresce' when struck by electrons, energy supply circuits for. the electrodes, a source" ofyelectrical impulses connected to said control member, and means for transferring electrical energy from the anode of said tube to the control member, said means including an electrical coupling vbetween said anode and control member, whereby control of the electrons through the tube and the variations in intensity of the light spot' on the fluorescent screen are enhanced.
  • a cathode-ray tube for translating electrical impulses into light rays, said tube including a cathode, an anodaan electrostatic control member and a screen adapted to fluoresce when struck by electrons, energy supply circuits for the electrodes,-a source of electrical impulses, an amplifier having input and output circuits,'said input circuit being connected to said source of impulses, said output circuit being connected to said control member, and an electrical.
  • said tubeinoluding a cathode, an anode, an electrostatic control member and a screen adapted to fluoresce when struck by electrons, energy supply circuits for the electrodes, a source of electrical impulses', an amplifier having input and output circuits, said input circuit being connected to said source of'impulses, said' output circuit being connected .to said control member, and an electrical energy feedback connection between said anode and the input circuit of said amplifier, said connection includinga capacitor.
  • a cathode-ray tube for translating electrical impulses into light rays, said tube including a cathode, an anode, an electrostatic control member,ienergy supply circuits for the electrodes, said tube also containing a screen which fluoresces when struck byelectrons and an electrode positioned between said control member and the cathode and adapted to be charged positive with respect to the cathode, and an electrical energy feedback connection between said positively charged electrode'and said control memberxwhereby.
  • said tube including a cathode, an anode, an'electrostatic control member, energy supply circuits for the. electrodes, said' tube also containing a screen which fluoresces when struck by electrons FRIEDRICH W. HEHLGANS.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US670556A 1932-05-27 1933-05-11 Electron discharge device Expired - Lifetime US2004790A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE403876X 1932-05-27

Publications (1)

Publication Number Publication Date
US2004790A true US2004790A (en) 1935-06-11

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ID=6419632

Family Applications (1)

Application Number Title Priority Date Filing Date
US670556A Expired - Lifetime US2004790A (en) 1932-05-27 1933-05-11 Electron discharge device

Country Status (4)

Country Link
US (1) US2004790A (de)
FR (1) FR755917A (de)
GB (1) GB403876A (de)
NL (1) NL35720C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459319A (en) * 1944-10-11 1949-01-18 Rca Corp Cathode-ray oscilloscope
US2928984A (en) * 1957-03-06 1960-03-15 Vickers Electrical Co Ltd Electronic circuit arrangements

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755217C (de) * 1935-06-22 1953-05-11 Georg Seibt Nachfolger Dr Rueckkopplungsschaltung fuer Kathodenstrahlroehren, insbesondere fuer Fernsehzwecke
DE898456C (de) * 1937-12-18 1953-11-30 Fernseh Gmbh Anordnung zur selbsttaetigen Bildhelligkeitsregelung in Schaltungen mit Kathodenstrahlroehren fuer Bildwiedergabe, insbesondere Fernsehuebertragungs-Einrichtungen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459319A (en) * 1944-10-11 1949-01-18 Rca Corp Cathode-ray oscilloscope
US2928984A (en) * 1957-03-06 1960-03-15 Vickers Electrical Co Ltd Electronic circuit arrangements

Also Published As

Publication number Publication date
NL35720C (de)
GB403876A (en) 1934-01-04
FR755917A (fr) 1933-12-01

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