US2205760A - Electronic generator - Google Patents

Electronic generator Download PDF

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Publication number
US2205760A
US2205760A US153909A US15390937A US2205760A US 2205760 A US2205760 A US 2205760A US 153909 A US153909 A US 153909A US 15390937 A US15390937 A US 15390937A US 2205760 A US2205760 A US 2205760A
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Prior art keywords
collector electrode
electrode
oscillations
time
saw
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Expired - Lifetime
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US153909A
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English (en)
Inventor
Fewings David John
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RCA Corp
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RCA Corp
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Publication date
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator

Definitions

  • This invention relates to electrical oscillation generator arrangements and more particularly to electrical oscillation generator arrangements'for producing saw-tooth or substantially saw-tooth 5 waves and suitable for use as time bases for cathode ray tube oscillograph, cathode ray television, and like purposes.
  • An important object of this invention is to provide saw-tooth Wave generator arrangements capable of supplying substantially rectilinear saw-tooth wave oscillations of sufficient amplitude to swing the beam of a high vacuum cathode ray tube over a relatively wide angle with a fly back time never greater than about t; of the sweep time and capable moreover of operating over a wide frequency range. 7
  • an oscillation generator arrangement for producing saw-tooth waves and suitable for use as a time base comprises a soLu-ce of oscillations; a cathode ray tube or electron beam valve having two differently positioned collector electrodes; deflecting means for deflecting the electron beam across said collector electrodes said collector electrodes being so arranged that during each deflection or sweep of the beam it impinges on one of the collector electrodes for only a relatively small fraction of the deflection period; means for applying oscillations from said source to said deflecting means to deflect the said beam; a time base circuit; and means for utilizing short sharp voltage pulses generated by reason of the incidence of said beam upon said one collector elec' trode to control said time base circuit.
  • said one collector electrode is behind the other collector electrode and said other electrode has a narrow slot which is traversed by the beam during each deflection and through which the beam must pass to reach said one electrode.
  • the whole arrangement is such 50 that the beam impinges upon said one electrode during and near those instants of time when the oscillatory wave from the source is passing through zero amplitude.
  • the oscillations from the source may be sinusoidal or approximately sinusoidal but especiallyif the last mentioned ar-.
  • the said oscillations may departvery considerably from the true sinusoidal wave shape without introducing deleterious effects.
  • FIG. 1 shows diagrammatically one embodiment of my invention using an electron beam tube
  • Fig. 2 shows a plan View of one of the electrodes of the electron beam tub-e
  • Figs. 3a, 3b and 30 show graphically electrical wave forms for explaining my invention.
  • Fig. 4 shows schematically the electrode arrangement of an electron beam tube.
  • the original source of oscillations is a thermionic Valve or dynatron oscillator represented simply by a rectangle l and adapted to produce an approximately sinusoidal voltage wave, though the said wave may, in the embodiment now being described, depart quite considerably from the sinusoidal, the harmonic content being relatively unimportant.
  • Such oscillators may easily be made in accordance with known principles to cover a frequency range. up to many megacycles.
  • the output from the oscillator is fed, for example, by coupling condensers 2, 3 to the plates 3,
  • This tube or valve which is purely diagrammatically represented (for example the envelope is shown as rectangular though, in practice, it would not, of course, be of this shape) has a rectilinear cathode 7 immediately behind a slit like gap to in a control electrode 3 of disc form, the slit 8a in the control electrode 8 corresponding approximately in length and width to the length and diameter of the emissive portion of the cathode l.
  • a first collector electrode 8 Spaced from and parallelled to the control electrode 53 is a first collector electrode 8 which may, for example, be av disc having an elongated diametrical narrow slit 9a of somewhat less length than the diameter of the disc.
  • This collector electrode is shown in face view in Figure 2.
  • The. slit 9a is parallel to the slit 8a and also parallel to the axis of the cathode 7.
  • a further collector electrode Ill which may be in the form of a smaller disc parallel to the electrode 9 and a short distance behind it.
  • the electrostatic deflector plates i, 5 Between the electrodes 8 and 9 are the electrostatic deflector plates i, 5
  • these plates being adapted to cause the electron beam which emerges through the slit 8a in the control electrode 8 to sweep across the first collector electrode 9 in a direction at right angles to the length of the slit 9a therein.
  • Suitable operating d-c potentials are applied to the various electrodes of the electron beam valve or cathode ray tube 6 from a source ii the potential supply lead to the first collector electrode 9 including a. resistance l2.
  • the electrode 9 is capacity coupled through a condenser it to the input lead it of any suitable known time. base circuit shown within the broken line rectangle 35.
  • the electrode Q is capacity coupled through condenser it to the control grid I6 of a tricde ll, said grid it being connected to earth through a grid leak 88, the cathode it of the tricde ll being connected to earth through the usual capacity shunted resistance combination 2i) and the anode 2! of the triode being connected to a source (not shown) of anode potential through a resistance 22 and being also connected to earth through a pair of preferably adjustable condensers 26% in series.
  • the voltage wave from the source l is, as shown in Figure 3 at (a), sinusoidal the wave form applied to the control grid iii of thetime base valve ll will be (as shown at (b) in Figure 3) a series of narrow substantially square topped positive voltage impulses and if the electron beam valve or cathode ray tube is symmetrically arranged these impulses may be caused to occur each time the voltage wave from the source through zero.
  • each positive impulse will depend upon the width of the slot 9a in the first collector electrode 9 and the amplitude ofthe oscillations from the source I since the latter controls the speed of passage of the electron beams across the slot 9a.
  • These impulses applied to the time base circuit cause the latter to produce saw-tooth oscillations (as shown at (c) in Figure 3) of substantially rectilinear form and reasonably good amplitude the fly back periods in this saw tooth wave oscillation corresponding to the positive impulses and the sweep periods being provided by the time base circuit itself.
  • the saw-tooth waves generated may be taken from across one of the condensers 211, it (as shown condenser 2 1) in the anode circuit of the time base circuit valve l1 and may be amplified in any convenient way,
  • a resistance I2 in the feed lead to the first collector electrode 9 and coupling this electrode to the time base circuit iii a resistance may be inserted in the feed lead to the second collector electrode.
  • a series of substantially square topped narrow negative voltage pulses may be inverted as to phase by a suitable phase reversing valve and then applied to the input terminals of the time base circuit valve.
  • the second collcc'tor electrode may be made larger than the first which may be made unslotted so that the second collector electrode receives the beam when the said beam overshoots the first collector electrode.
  • This arrangement is represented in Figure 4 in which 9 represents the first collector electrode and ID the second. Again the arrangement may be made such that the electron beam is incident upon the second collector electrode more than once per deflection, e. g. there might be two slots in the first collector electrode.
  • the arrangement of Figure l is, however, preferred.
  • the upper limit as to frequency to which arrangements as above described are subject, is that imposed by the amplifier 25 for the saw-tooth wave oscillations.
  • the saw-teeth will be substantially rectilinear and since the fly-back? duration is determined by the length of time during which the electron beam is incident upon the second collector electrode Iii (or Hi) this can be controlled at will by varying the amplitude of the oscillations from the original source l.
  • the original source of oscillations can be synchronized in any well known method; such synchronization is particularly easily afiected if a dynatron type of oscillator is employed.
  • the method of generating controlled wave energy which comprises the steps of producing sinusoidal oscillations, controlling the deflection of a focused beam of electrons in accordance with the produced sinusoidal oscillations, producing rectangular wave shape energy impulses from the controlled deflected beam of electrons, storing energy substantially linearly with time, and initiating the discharge of the stored energy by said produced rectangular wave shape energy impulses.
  • the method of generating controlled Wave energy which comprises the steps of producing sinusoidal oscillations, deflecting a focused beam of electrons in accordance with the produced sinusoidal oscillations, producing rectangular wave shape energy impulses from the deflected beam of electrons, storing energy substantially linearly with time, and initiatingthe discharge of the stored energy by said produced rectangular wave shape energy impulses.
  • a saw-tooth wave oscillator comprising means for producing sinusoidal oscillations, means for deflecting a focused beam of electrons in accordance with the produced sinusoidal os- (iii cillations, means for producing rectangular wave shape energy impulses from the deflected beam of electrons, means for storing energy substantially linearly with time, and means for initiating the discharge of the stored energy by said produced rectangular Wave shape energy impulses.
  • a saw-tooth Wave oscillator comprising means for producing sinusoidal oscillations, means for deflecting a focused beam of electrons in accordance with the produced sinusoidal oscillations, means for producing rectangular Wave shape energy impulses from the deflected beam of electrons, means for storing energy substantially linearly with time, and means for initiating the discharge of the stored energy by said produced rectangular wave shape energy impulses.
  • An oscillation generator comprising a cathode ray tube having means to produce a beam of electrons, deflecting means for deflecting the produced beam of electrons, a collector electrode, an apertured diaphragm positioned intermediate the collector electrode and the beam producing means, a source of sinusoidal oscillations, connections from said source of oscillations to said deflecting means for deflecting said beam of electrons across the apertured diaphragmv whereby said beam impacts upon said collector electrode for only a relatively small fraction of the time period of the beams deflection to produce rectangular Wave shape energy impulses, means for storing energy substantially linearly with time, and means to initiate the discharge of the stored energy by the produced rectangular Wave shape energy impulses, and a load circuit energized by the discharged stored energy.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Microwave Tubes (AREA)
US153909A 1936-07-21 1937-07-16 Electronic generator Expired - Lifetime US2205760A (en)

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GB2205760X 1936-07-21

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BE (1) BE422747A (hr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616044A (en) * 1946-07-25 1952-10-28 Rca Corp Sawtooth wave voltage generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616044A (en) * 1946-07-25 1952-10-28 Rca Corp Sawtooth wave voltage generator

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Publication number Publication date
BE422747A (hr)

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