US2527462A - Saw-tooth oscillation generator - Google Patents

Saw-tooth oscillation generator Download PDF

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Publication number
US2527462A
US2527462A US623245A US62324545A US2527462A US 2527462 A US2527462 A US 2527462A US 623245 A US623245 A US 623245A US 62324545 A US62324545 A US 62324545A US 2527462 A US2527462 A US 2527462A
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United States
Prior art keywords
tube system
grid
anode
electrode
control grid
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
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US623245A
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English (en)
Inventor
Spooner Archer Michael
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2527462A publication Critical patent/US2527462A/en
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/12—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor
    • H03K4/16—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor using a single tube with positive feedback through transformer, e.g. blocking oscillator
    • 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

  • Patentexpires September 5, 1964 three grids in which the first grid4 adjacent the cathode is adapted to function as a control electrode, the second grid as a screen or accelerating electrode and a third grid which will be referred to as an additional control electrode.
  • the present invention is concerned only with said-multi-electrode valves of a Ytype possessing the characteristic that when suitable operatingl accelerating electrodes, While the first and third.
  • a modification of the present invention consists in the control grid ofthe synchronising impulsev amplifier or buffer valve beingadapted by means of a negative bias to suppress the electron emission fromth'e *cathode of the said valve except when a synchronising impulse isreceived f
  • the invention is particularly applicable to thermionic valves in which two electrode systems l Valve is joined internally to the control grid of the triode-section.
  • triode-hexode I is-shown, the third grid2 of the hexode section being internally connected to theV control grid S'of the triode section.
  • the triode section is arranged in a blocking oscillator circuit, the usual over-coupled transformer being denoted by 5, while 5 and -'I represent respectively the customary resistance and condenser in the grid circuit ofthe triode section. If the anode 4 ofthe triode section is joinedl by way of theY trans'- former windingshown, to a suitable positive potential source e; g.
  • the hexode section ofthetriode heXode I has its control (first) grid'l adapted to receive the said impulses byvv way ofY coupling condenser II and resistance I2.
  • rlhe anode kvI3 of the hexode section is connected byway of aresistance Itto a suitable positive sourceof potential.
  • the second and fourth grids I5 I6 are joined. and connected by Way of re- ⁇ sstance II to a positive potential source, while grids I5, I6 are also joined by a small condenser I8 to the grid 3 of the triode section.
  • the hexode section thereby behaves as a buffer stage with regard to synchronising impulses and if correctly set up amplification of these impulses may be obtained, which are then applied by way of condenser I8 to the blocking oscillator to enable synchronisation of the latter to be obtained in the known manner.
  • the hexode seotion In addition to acting as a buffer stage with regard to synchronizing impulses the hexode seotion also takes part in the generation oi sawtooth oscillations by the triode section.
  • the operation can be explained as follows: the impulse Voltage normally occurring at the control grid 3 of the triode section during the short bursts of radiofrequency oscillation referred to above which occur during the return stroke or yback of the sawtooth wave form, is transferred to third grid 2 by virtue of the direct connection between grids 2 and 3 and generates a voltage impulse in the same sense on the second and fourth grids I5, I6 of the hexode section.
  • This voltage impulse at the second and fourth grids is transferred by the coupling condenser I8 back to grid 3 and results in an intensification of the voltage impulse at that grid, and therefore a corresponding increase in the anode current of the triode section.
  • the time duration of the return stroke of the sawtooth oscillation is accordingly reduced, since the said anode current is obtained mainly from the charge on condenser 9, which is thereby discharged at an increased rate.
  • This eifect is the main advantage of the present invention since the time of the return stroke or iiyback of the sawtooth wave form, which depends on the time taken to discharge condenser 9, is thereby reduced.
  • Typical Values of the components of the circuit shown in the drawing for the generation of a 50 cycles/sec. time base voltage for television use, are as follows:
  • the transformer 5 may consist of two coils of litz wire, closely coupled and having a dust iron core through the coils.
  • An oscillation generator comprising a blocking oscillator including a rst discharge tube system having at least control grid and anode electrodes, and a synchronizing impulse ampliiier for said oscillator, said amplifier including a second discharge tube system having at least control grid, accelerating grid, additional control grid and anode electrodes, the operating characteristic of said second tube system being such that with suitable operating potentials applied to said electrodes a change in potential at said control grid results in a current change in the same sense at said accelerating grid and a change in potential at said additional control grid results in a current change in the opposite sense at said accelerating grid, means to connect a positive potential t0 the anode of said second tube system, a load impedance, means to connect a positive potential through said impedance to the accelerating grid of said second tube system, a capacitor coupling the accelerating grid of said second tube system to the control grid of said first tube system, means connecting the additional control grid of said second tube system to the control grid of said first tube system, and means for applying synchronizing
  • An oscillation generator comprising a blocking oscillator including a rst discharge tube system having at least control grid and anode electrodes, and a synchronizing impulse amplier for said oscillator, said amplifier including a second discharge tube system having in succession control grid, accelerating grid, additional control grid and anode electrodes, the operating characteristic of said second tube system being such that with suitable operating potentials applied to said electrodes a change in potential at said control grid results in a current change in the same sense at said accelerating grid and a change in potential at said additional control grid results in a current change in the opposite sense at said accelerating grid, means to connect a positive potential to the anode of said second tube system, a load impedance, means to connect a positive potential through said impedance to the accelerating grid of said second tube system, a capacitor coupling the accelerating grid of said second tube system to the control grid of said first tube system, means connecting the additional control grid of said second tube system to the control grid of said first tube system, and means for applying synchronizing impulses to
  • An oscillation generator comprising a blocking oscillator including a first discharge tube system having at least control grid and anode electrodes, and a synchronizing impulse amplifier for said oscillator, said amplifier including a second discharge tube system having in successive arrangement a cathode, first, second, third and fourth grids and an anode, said rst grid acting as a control electrode, said second and fourth grids being connected together and acting as an accelerating electrode and said third grid acting as an additional control electrode, the operating characteristic of said second tube system being such that with suitable potentials applied to said electrodes a change in potential at said additional control electrode results in a current change in the opposite sense at said acceleratinggelectrode,
  • An oscillation generator comprising a blocking oscillator including a first discharge tube system having at least control grid and anode electrodes, and a synchronizing impulse amplier for said oscillator, said amplifier including a second discharge tube system having in successive arrangement a cathode, rst, second, third and fourth grids and an anode, said rst grid acting as a control electrode, said second and fourth grids being connected together and acting as an accelerating electrode and said third grid acting as an additional control electrode, the operating characteristic of said second tube system being such that with suitable potentials applied tosaid electrodes a change in potential at said additional control electrode results in a current change in the opposite sense at said accelerating electrode,
  • An oscillation generator comprising a blocking oscillator including a rst discharge tube system having cathode, grid and anode electrodes, an over-coupled transformer having primary and secondary windings, one end of said primary being connected to grid of said rst tube system, one end of said secondary being connected to anode of said first tube system, a resistance-capacitance parallel network connected between the other end of said primary and cathode of said rst tube system, a charging condenser connected between the other end of said secondary and cathode of said rst tube system, a resistor, and
  • said amplifier including a second discharge tube system having in successive arrangement a cathode, rst, second, third and fourth grids and an anode, said first grid acting as a controll electrode, said second and fourth grids being connected together and acting as an accelerating electrode and said third grid acting as an additional control electrode, the operating characteristic of said second tube system being such that with suitable potentials applied to said electrodes a change in potential at said additional control electrode results in a current change in the opposite sense at said accelerating electrode, means to connect a positive potential to the anode of said second tube system, a load impedance, means to connect a positive potential through said impedance to the accelerating electrode of said second tube system, a capacitor coupling the accelerating electrode of said second tube system to the control grid of said rst tube system, means connecting the additional control electrode of said second tube system to the control grid of said rst tube system, means connecting the additional control electrode of said second tube system to the control grid of said rst tube system, means

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Particle Accelerators (AREA)
  • Details Of Television Scanning (AREA)
  • Amplifiers (AREA)
  • Lasers (AREA)
US623245A 1944-09-05 1945-10-19 Saw-tooth oscillation generator Expired - Lifetime US2527462A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB263444X 1944-09-05
GB21045X 1945-10-02

Publications (1)

Publication Number Publication Date
US2527462A true US2527462A (en) 1950-10-24

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ID=26237257

Family Applications (1)

Application Number Title Priority Date Filing Date
US623245A Expired - Lifetime US2527462A (en) 1944-09-05 1945-10-19 Saw-tooth oscillation generator

Country Status (6)

Country Link
US (1) US2527462A (enrdf_load_stackoverflow)
BE (1) BE482007A (enrdf_load_stackoverflow)
CH (1) CH263444A (enrdf_load_stackoverflow)
DE (1) DE814495C (enrdf_load_stackoverflow)
FR (1) FR959757A (enrdf_load_stackoverflow)
GB (1) GB589439A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787707A (en) * 1953-06-16 1957-04-02 Gen Electric Pulse generators

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958744C (de) * 1951-11-30 1957-02-21 Sueddeutsche Telefon App Kabel Selbstsperrender, durch Impulse synchronisierter Schwingungserzeuger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510531A (en) * 1938-02-02 1939-08-02 Baird Television Ltd Improvements in or relating to the synchronisation of oscillation generators
US2193850A (en) * 1937-04-24 1940-03-19 Telefunken Gmbh Oscillation generator
US2297742A (en) * 1941-07-15 1942-10-06 Du Mont Allen B Lab Inc Blocking tube oscillator for television
US2310888A (en) * 1940-03-14 1943-02-09 Bahring Herbert Synchronized saw-tooth current generator
US2363822A (en) * 1941-01-02 1944-11-28 Rca Corp Saw-tooth deflection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193850A (en) * 1937-04-24 1940-03-19 Telefunken Gmbh Oscillation generator
GB510531A (en) * 1938-02-02 1939-08-02 Baird Television Ltd Improvements in or relating to the synchronisation of oscillation generators
US2310888A (en) * 1940-03-14 1943-02-09 Bahring Herbert Synchronized saw-tooth current generator
US2363822A (en) * 1941-01-02 1944-11-28 Rca Corp Saw-tooth deflection
US2297742A (en) * 1941-07-15 1942-10-06 Du Mont Allen B Lab Inc Blocking tube oscillator for television

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787707A (en) * 1953-06-16 1957-04-02 Gen Electric Pulse generators

Also Published As

Publication number Publication date
DE814495C (de) 1951-09-24
CH263444A (de) 1949-08-31
GB589439A (en) 1947-06-20
FR959757A (enrdf_load_stackoverflow) 1950-04-05
BE482007A (enrdf_load_stackoverflow)

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