US2512400A - Television horizontal deflection - Google Patents

Television horizontal deflection Download PDF

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Publication number
US2512400A
US2512400A US50302A US5030248A US2512400A US 2512400 A US2512400 A US 2512400A US 50302 A US50302 A US 50302A US 5030248 A US5030248 A US 5030248A US 2512400 A US2512400 A US 2512400A
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United States
Prior art keywords
terminal
transformer
condenser
diode
circuit
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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
US50302A
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English (en)
Inventor
Karl R Wendt
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RCA Corp
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RCA Corp
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Filing date
Publication date
Priority to NL148552D priority Critical patent/NL148552C/xx
Priority to BE491135D priority patent/BE491135A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US50302A priority patent/US2512400A/en
Priority to GB22037/49A priority patent/GB664216A/en
Priority to FR994278D priority patent/FR994278A/fr
Application granted granted Critical
Publication of US2512400A publication Critical patent/US2512400A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
    • H03K4/62—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as a switching device
    • H03K4/68—Generators in which the switching device is conducting during the fly-back part of the cycle
    • 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
    • H03K4/86—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements gas-filled tubes or spark-gaps

Definitions

  • This invention relates to wave forming systems and more particularly to television horizontal or line deflection systems.
  • Television horizontal magnetic deflection circuits normally employ high vacuum type tubes to generate the sawtooth wave currents required for deflection of the cathode ray beam used in the image scanning operation; Because of the possible gain in efficiency in such magnetic generators employed in television systems, attempts have often been made to use gas discharge tubes, such as those known in the art as thyr-atrons. However, the de-ionization time of thyratrons makes such tubes practically inoperative when used in conventional television horizontal deflection circuits.
  • a circuit arrangement utilizing an auto-transformer to obtain voltage gain and there is provided an arrangement whereby the grid controlled thyratron may be made to conduct during the short or retrace interval when an arbitrary conduction wave shape can be tolerated.
  • the primary object of this invention is to provide for improved and more efficient television horizontal or line magnetic deflection.
  • acathode ray tube l which may, for example; take the form of the well-known kinescope with magnetic type deflection accomplished through vertical deflecting coils 3 and horizontal deflecting coils 5.
  • tube l Details of construction and operation of tube l are not given here in view of the fact that the employment of this invention is not particularly limited to any specific form thereof. Typical kinescopes are well shown and described in the television art.
  • driver tube 1 which, as illustrated, takes the form of a gas discharge device such as a thyratron which includes a control electrode 9 and an auxiliary electrode I l.
  • a gas discharge device such as a thyratron which includes a control electrode 9 and an auxiliary electrode I l.
  • the control electrode 9 is adapted to receive synchronizing pulses.
  • An auto-transformer l3 includes a terminal l5 which is'common to both the primary and secondary of theauto-transformer 13. There is also included an uncommon terminal H which is connected to the anode of tube 1. A second uncommon terminal [9 is connected through a condenser 2
  • a parallel connected circuit including resistance 25 and capacity 21 is connected to terminal [5 of the auto-transformer l3 and the cathode of diode 23.
  • Thyratron tube 1 is supplied with an operating anode potential through the primary of autotransformer I3 and through the resistance capacity circuit from terminal 29 to which there is applied a positive potential of the order, for example, of 300 volts.
  • a circuit output terminal is also provided at the junction of condenser 2
  • the other terminal of deflection coils 5 is connected to a point of fixed potential such as ground, through acondenser-3h
  • the choke coil 33 having a high inductance value as compared to the inductanceof the de fiection coils 5 is connected between the sourceof positive potential at terminal 29 and the junction between condenser 2! and tli'ezanode of;diode 23'i.v
  • choke coil 33 permits centering of the scanning beam without resorting to auxiliary circuit arrangements to compensate for thedirect current componentflovving in the circuit from power supply terminal 29
  • the operation of the circuit shown in the-drawing may best be explained by considering the driver tube 7 and the diode'23 as switches; For the purpose of the description of the operation ofthe circuit let it be assumed that no power has been supplied to the circuit and'that for the initial part of this explanation none of the condensers of the circuit contain a charge.
  • tube 7 Upon application of a positive synchronizing pulse to control electrode 9 of driver tube 1, tube 7 becomes conducting, driving point I! of transformer l3 to the ionization potential of tube 1 which is very close to ground potential. This drop in potential at point IT causes terminal IQ of auto-transformer I3 to go to a negative potential and extinguish tube 1.
  • diode 23 will be non-conducting when its anode is negative with respect to its associated cathode, a surge of current will be'formed" in the choke coil 33 and the deflecting coils-5.
  • This circuit output terminal may: be.
  • terminal H Upon the application of a positive synchronizing pulse to control electrode 9 of driver tube 1, terminal H, as has been explained above, will be dropped in potential to substantially ground potential. It follows then that the anode of diode 23 -wi1l be drivennegative to open thediode 23 thus causing the magnetic field in choke coil 33 and deflection coils 5 to collapse. This collapsing corrresponds to the short retrace time in the scanning cycle. The flywheel effect in the inductance of transformer l3 will cause point I1 tocontinue passground potential in a negative direction" to' extinguish the driver tube 1. Terminal I9willthen in its oscillation return to a positive potential and cause diode 23 to conduct by reason of the fact that the anode of diode 23" exceeds in a positive direction the potential of its associated cathode.
  • the driver tube 1 Atthe arrival of the next positive synchronizing pulse, the driver tube 1 is againmade conducting and'the cycle repeats.
  • the difficulty in extinguishinggas tube 1 may beovercome by increasing the time duringwhich its anodeis negative with respect to its cathode. In the circuit shown this may beaccomplished by constructing auto-transformer I3- in such amanner that it has leakage inductance-or adding a small inductance between terminal I! and the anode of the driver tube.
  • a sawtoothwave generator comprising, in combination, a transformer havin an input and output circuit, said transformer also having a terminal connected common to said input and output circuits, an uncommon terminal for said input circuit and an uncommon terminal for said'output circuit, a switching device connected between said uncommon input-terminal and a point.
  • a condensernconnected to the uncommon output terminal of said transformer a diode tube havinga cathode, said diode connected between said common terminal 'of said transformer andsaid condenser terminal opposite to the-termifixed potential, saidswitching device consisting nal connected to said uncommon output terminal, the cathode of said diode being connected to said common terminal, a choke coil connected between said source of positive potential and the junction of said condenser and diode tube, a circuit output terminal at the junction of said condenser and diode tube, and means for closing said switching device periodically for relatively small time intervals.
  • a sawtooth wave generator comprising, in combination, an auto-transformer having an input and output circuit, said auto-transformer also having a terminal common to said input and output circuits, an uncommon terminal for said input circuit, and an uncommon terminal for said output circuit, a thermionic switching device connected between said uncommon input terminal and a point of fixed potential, a, parallel connected resistance and capacity circuit, a source of potential positive with respect to said fixed potential connected to said common terminal through said parallel connected resistance and capacity circuit, a condenser connected to the uncommon output terminal of said transformer, a diode tube having a cathode, said diode connected between said common terminal of said auto-transformer and the terminal of said condenser opposite to the terminal connected to said uncommon output terminal, said diode cathode connected to said common terminal, a choke coil connected between said source of positive potential and the junction of said condenser and diode tube and a cathode ray tube deflection coil, said cathode ray tube deflection coil connected serial
  • a sawtooth wave generator comprising, in combination, an auto-transformer having an input and output circuit, said auto-transformer also having a terminal common to said input and output circuits, an uncommon terminal for said input circuit, and an uncommon terminal for said output circuit, said auto-transformer having a step-up turn ratio between its primary and secondary circuits, a gaseous discharge tube switching device connected between said uncommon input terminal and a point of fixed potential, a parallel connected resistance and capacity circuit, a source of potential positive with respect to said fixed potential connected to said common terminal through said parallel connected resistance and capacity circuit, a diode having a cathode and an anode, a condenser connecting said diode and said common terminal of said auto-transformer, said diode cathode connected to said common terminal, a choke coil connected between said source of positive potential and the junction of said condenser and diode and a cathode ray tube deflection coil, said cathode ray tube deflection coil connected serially with a
  • a sawtooth wave generator comprising, in combination, an auto-transformer having an input and output circuit, said auto-transformer also having a terminal common to said input and output circuits, an uncommon terminal for said input circuit, and an uncommon terminal for said i output circuit, said auto-transformer having a step-up turn ratio between its primary and secondary circuits, a switching device connected between said uncommon input terminal and a point of fixed potential, said switching device consisting of a gaseous discharge tube, a parallel connected resistance and capacity circuit, a source of positive potential connected to said common terminal through said parallel connected resistance and capacity circuit, one terminal of a condenser connected to the uncommon output terminal of said transformer, a diode connected between said common terminal of said auto-transformer and the other terminal of said condenser, a choke coil connected between said source of positive potential and the junction of said con denser and diode, a cathode ray tube deflection coil, said cathode ray tube deflection coil connected serially with a second conden
  • a sawtooth wave generator comprising, in combination, an auto-transformer having an input and output circuit, said auto-transformer also having a terminal common to said input and output circuits, an uncommon terminal for said input circuit and an uncommon terminal for said output circuit, said auto-transformer having a step-up turn ratio between its primary and secondary circuits, a discharge switching device connected between said uncommon input terminal and a point of fixed potential, said switching device consisting of a gaseous discharge tube,
  • a parallel connected resistance and capacity circuit for periodically firing said gaseous discharge tube, a parallel connected resistance and capacity circuit, a source of potential positive with respect to said fixed potential connected to said common terminal through said parallel connected resistance and capacity circuit, a diode having an anode, a condenser connected between said uncommon output terminal of said autotransformer and said diode anode, a choke coil connected between said source of positive potential and the junction of said condenser and diode, and a cathode ray tube deflection coil, said cathode ray tube deflection coil connected serially with a second condenser, said serially connected deflection coil and second condenser connected between a point of fixed potential and the junction of said condenser and diode.
  • a sawtooth wave generator comprising, in combination, an auto-transformer having an input and output circuit, said auto-transformer also having a terminal common to said input and output circuits, an uncommon terminal for said input circuit, and an uncommon terminal for said output circuit, said auto-transformer having a step-up turn ratio between its primary and secondary circuits, a thyratron switching device connected between said uncommon input terminal and a point of fixed potential, said switching device consisting of a gaseous discharge tube, a control electrode in said gaseous discharge tube for firing said gaseous discharge tube periodically, a parallel connected resistance and capacity circuit, a source of potential positive with respect to said fixed potential connected to said common terminal through said parallel' connected resistance and capacity: circuit;.
  • condenser and havingits anode connected to .the condenser terminalopposite that connected to the uncommon output terminal of-.tlie auto-transformer, the cathode of said .diode connected to said" transformer common terminal, a choke coil con; nected betweensaid source of positive potential" and the junctionof said' condenser'and” diode, and a cathode ray tube deflection coilpsaidcathode ray.
  • tube defiec'tioncoil' connected serially with a secondf'con'denser, s'aidiserially connect: ed deflection ,coilland second condenser connected between a point of fi'xedpotential andthe junction of said condenser and diode.
  • 8.-A.sawtooth wave generator comprising; in combination, an auto-transformer having a-n' in put and output circuit, said aut'o transformer also having a terminal common to said input and output circuits, an uncommon terminal for "said" input circuit, and an uncommon terminal forsaid output circuit; said auto-transformer having a step-up turn ratio between itsprimary and secondary circuits, a thyratron'switching-device'- connected'between said uncommon input'termi--- nal and a point of'fixedpotential, said'switching device consisting ofagaseous discharge tube, means for firing said' gaseous discharge tube: periodically and" at the "beginning of the snapback time interval of the sawtooth-wave," and'lian Numb er 8i inductance; connected in series with: said gas eous discharge'tubewfor making ;said:gaseous?
  • condenser connected 1 tothe uncommon output" terminal of said transformer, a: diode having a cathode. and an anode saiddiode "connected between said commonvterminal of said auto-trans--- former and said: condenser terminalopposite that: connected to (the.- uncommon output termi nal of a the auto-transformer, thecathode of said diode connected; t0 said transformer common: terminal, a; choke coil: connected between said source of :positivewpotential and the junction ofsaid: condenser and diode, and a cathode raytube deflection?
  • a sawtooth: wavegenerator comprising, incombination; arr auto-transformer. having aninput? and: output circuit, said auto-transformer-- alsov havingy-aiterminal :common to said input and output circuits, an uncommon :terminalfor said inputcircuit, and: an --uncommon--terminal for. said output circuit, said:auto-transformer havingya step-upturn ratio between its primary and. secondary; circuits-,..agaseous tube switching device? connected between said uncommon input.
  • c-athode-rayrtube deflection coil connected seria'llyzwithra-secon-d condenser, said serially connected': deflection :coil and-second condenser connectedxbettveen a poi-nt offixed potential andthe junction-of said condenser anddiode.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
US50302A 1948-09-21 1948-09-21 Television horizontal deflection Expired - Lifetime US2512400A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL148552D NL148552C (fr) 1948-09-21
BE491135D BE491135A (fr) 1948-09-21
US50302A US2512400A (en) 1948-09-21 1948-09-21 Television horizontal deflection
GB22037/49A GB664216A (en) 1948-09-21 1949-08-24 Sawtooth wave generator
FR994278D FR994278A (fr) 1948-09-21 1949-09-01 Système de déviation horizontale pour la télévision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50302A US2512400A (en) 1948-09-21 1948-09-21 Television horizontal deflection

Publications (1)

Publication Number Publication Date
US2512400A true US2512400A (en) 1950-06-20

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US50302A Expired - Lifetime US2512400A (en) 1948-09-21 1948-09-21 Television horizontal deflection

Country Status (5)

Country Link
US (1) US2512400A (fr)
BE (1) BE491135A (fr)
FR (1) FR994278A (fr)
GB (1) GB664216A (fr)
NL (1) NL148552C (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606305A (en) * 1949-09-27 1952-08-05 Pye Ltd Television scanning circuits
US2784344A (en) * 1953-07-02 1957-03-05 Rca Corp Raster centering control
DE1007806B (de) * 1955-05-05 1957-05-09 Fernseh Gmbh Anordnung zur Erzeugung von Saegezahnstroemen
DE1041612B (de) * 1955-06-21 1958-10-23 Philips Nv Schaltungsanordnung zum Erzeugen eines Saegezahnstromes durch eine Induktivitaet
DE1141327B (de) * 1956-06-12 1962-12-20 Sautier & Jaeger Schaltungsanordnung zur Erzeugung der Horizontalablenkspannung fuer Mehrnormenfernsehempfaenger
DE1762852B1 (de) * 1968-07-17 1971-01-07 Loban Vitalij I Bildkippsteuergenerator des Fernsehempfaengers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139432A (en) * 1935-02-06 1938-12-06 Telefunken Gmbh Oscillation producing system
US2227480A (en) * 1935-10-29 1941-01-07 Telefunken Gmbh Energy generator for cathode ray deflection means
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139432A (en) * 1935-02-06 1938-12-06 Telefunken Gmbh Oscillation producing system
US2227480A (en) * 1935-10-29 1941-01-07 Telefunken Gmbh Energy generator for cathode ray deflection means
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606305A (en) * 1949-09-27 1952-08-05 Pye Ltd Television scanning circuits
US2784344A (en) * 1953-07-02 1957-03-05 Rca Corp Raster centering control
DE1007806B (de) * 1955-05-05 1957-05-09 Fernseh Gmbh Anordnung zur Erzeugung von Saegezahnstroemen
DE1041612B (de) * 1955-06-21 1958-10-23 Philips Nv Schaltungsanordnung zum Erzeugen eines Saegezahnstromes durch eine Induktivitaet
DE1141327B (de) * 1956-06-12 1962-12-20 Sautier & Jaeger Schaltungsanordnung zur Erzeugung der Horizontalablenkspannung fuer Mehrnormenfernsehempfaenger
DE1762852B1 (de) * 1968-07-17 1971-01-07 Loban Vitalij I Bildkippsteuergenerator des Fernsehempfaengers

Also Published As

Publication number Publication date
NL148552C (fr)
GB664216A (en) 1952-01-02
FR994278A (fr) 1951-11-14
BE491135A (fr)

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