US2202612A - Electron beam control system - Google Patents

Electron beam control system Download PDF

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Publication number
US2202612A
US2202612A US80984A US8098436A US2202612A US 2202612 A US2202612 A US 2202612A US 80984 A US80984 A US 80984A US 8098436 A US8098436 A US 8098436A US 2202612 A US2202612 A US 2202612A
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United States
Prior art keywords
electron beam
voltage
coils
control system
control electrode
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Expired - Lifetime
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US80984A
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English (en)
Inventor
Urtel Rudolf
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Telefunken AG
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Telefunken AG
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Filing date
Publication date
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Publication of US2202612A publication Critical patent/US2202612A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/24—Blanking circuits
    • 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 present invention relates to deflecting systems for controlling the movement of an electronic ray, pencil or beam developed, for example, in a cathode ray or so-called Braun tube or in a related type of electronic device.
  • cathode ray tubes which are to be used as television receivers, after completion of each scanning line and after the completion of scanning each frame of the image, are blocked for the duration of the line or picture impulse in order that the deflector circuit in question may have a chance to be restored to the initial state required for the transmission of the following line or the following frame of the image. It has been suggested also to make this blocking action a function of the restoring process of the receiver circuit in question. This has been accomplished by the aid of an auxiliary coil which was in coupling relation with the deflector coil, and 20 whose voltage was utilized by way of an auxiliary amplifier for acting upon the picture amplifier. Quite apart from the fact that such an amplifier may entirely be dispensed with, as shall be shown by the invention hereinafter to be disclosed, it may under certain circumstances also be causative of disturbances which in all likelihood are associated with building-up phenomena in the amplifier.
  • the invention in one of its preferred forms provides for a voltage divider .'..',s by way of a condenser with the tube deflection coils, so that part of the potential acts in the circuit serving for the brightness control of the Braun tube.
  • the blocking is to take place after completion of each line and after completion of each picture or frame, or, in the so-called interlaced-line method of scanning, after completion of each series of lines.
  • Figs. la and lb show the time-shape of the current in the deflector coils of a cathode ray tube, la being concerned with the case where the cathode ray pencil is deflected by a coil current presenting a linear rise, while Fig. 1b is to illustrate the case where the cathode ray pencil or beam is deflected by a linearly declining coil current;
  • Figs. 2a and 2b represent the voltages across the deflecting coils of the cathode ray tube for the conditions shown by Figs. 1a, and 1b respectively; and Figs. 3a and 31) represent the circuits corresponding to Figs. 1a, 2a and 1b, 21).
  • Figs. 1b which corresponds to the intermission of line, frame or line series, the current changes in the coils with comparatively great rapidity, and the deflector circuit in question is restored to its original state.
  • the voltage across the deflector coil has a shape during these periods as illustrated in Figs. 2a and 2b. The same is constant during its linear rise, and it has during the rapid return (flyback) time t1, t2 and t3, ii, a positive and a negative peak, respectively is developed across the coils.
  • FIG. 3a and 3b The corresponding circuit arrangements are shown in Figs. 3a and 3b as above stated. Reference may be made now to Figs. 3a and 3b where numeral Iii denotes the cathode ray tubes, I I the coil pairs, and I2 the D. C. sources which furnish the deflector currents.
  • the parts of the circuit organization which serve to produce the linearly rising or linearly decaying coil current have been omitted in Figs. 3aand 31) for simplicity, but are well known in the art.
  • Such forms of devices are, however, well known in the art and are illustrated for example by British Patents 395,499; 401,990; 402,629 and 403,283 as well as other prior art.
  • the control electrodes I4 of the cathode tubes coupled to the secondaries of the transformers I3 are energized with the image or video 35 signals.
  • the control electrodes I i have supplied thereon a constant biasing potential from the D. C. sources I5.
  • the fall of potential across resistance l8 represents a negative potential for the electrode M and thus becomes added to the voltage of battery It; during the linear drop of the current, on the contrary, the fall of potential across resistance it! forms a positive biasing voltage for the electrode M which becomes subtracted from potential l5 and which may be lower or higher than, or equal to, this voltage.
  • an electron tube having means therein to develop an electron beam and an observation screen upon which the developed electron beam produces luminous effects, a pair of electromagnetic coils for deflecting the produced electron beam, a control electrode for controlling the intensity of the produced electron beam, means to supply video signals upon the control electrode to vary thereby the beam intensity, means to energize the beam deflecting coils, a series combination comprising a capacity element and a voltage divider, the capacity element of said series combination having one terminal thereof connected to one end of the deflecting coils, and means for impressing the potential on the midpoint of the voltage divider directly onto said control electrode, said midpoint, said control electrode, and said means to supply video signals upon the control electrode being connected serially.
  • an electron tube having means therein to develop an electron beam and an observation'screen upon which the developed electron beam produces luminous efiects, a pair of electromagnetic coils for deflecting the produced electron beam, a control electrode for controlling the intensity of the produced electron beam, means to supply video signals upon the control electrode to vary thereby the beam intensity, means to energize the beam deflecting coils, a capacity element having one terminal thereof connected to One end of the deflecting coils, a resistance element in series with the capacity and connected to the other terminal thereof, a source of biasing voltage, a connection from the resistance element to said control electrode through said source of biasing voltage, and means for applying video signal impulses to the control electrode through said connection to said 5 electrode from said resistance element.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US80984A 1935-04-03 1936-05-21 Electron beam control system Expired - Lifetime US2202612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2202612X 1935-04-03

Publications (1)

Publication Number Publication Date
US2202612A true US2202612A (en) 1940-05-28

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Application Number Title Priority Date Filing Date
US80984A Expired - Lifetime US2202612A (en) 1935-04-03 1936-05-21 Electron beam control system

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US (1) US2202612A (fr)
AT (1) AT148673B (fr)
FR (1) FR803931A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426419A (en) * 1942-12-23 1947-08-26 Du Mont Allen B Lab Inc Return trace blanking and mixing
US2488386A (en) * 1947-03-24 1949-11-15 Rca Corp Deflection circuit
US2497002A (en) * 1941-05-19 1950-02-07 Rca Corp Pulse echo range finding system and impulse generator therefor
US2597054A (en) * 1942-11-17 1952-05-20 Cfcmug Coupling for cathode-ray tubes
US2602909A (en) * 1950-06-23 1952-07-08 Sol L Reiches Means for improving the definition in the presentation of intensity modulated cathode-ray tubes
US2607847A (en) * 1949-11-08 1952-08-19 Motorola Inc Vertical retrace blanking
US2950346A (en) * 1958-07-21 1960-08-23 Rca Corp Television receivers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497002A (en) * 1941-05-19 1950-02-07 Rca Corp Pulse echo range finding system and impulse generator therefor
US2597054A (en) * 1942-11-17 1952-05-20 Cfcmug Coupling for cathode-ray tubes
US2426419A (en) * 1942-12-23 1947-08-26 Du Mont Allen B Lab Inc Return trace blanking and mixing
US2488386A (en) * 1947-03-24 1949-11-15 Rca Corp Deflection circuit
US2607847A (en) * 1949-11-08 1952-08-19 Motorola Inc Vertical retrace blanking
US2602909A (en) * 1950-06-23 1952-07-08 Sol L Reiches Means for improving the definition in the presentation of intensity modulated cathode-ray tubes
US2950346A (en) * 1958-07-21 1960-08-23 Rca Corp Television receivers

Also Published As

Publication number Publication date
AT148673B (de) 1937-02-25
FR803931A (fr) 1936-10-12

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