US3628164A - Frame time base for television receivers - Google Patents

Frame time base for television receivers Download PDF

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Publication number
US3628164A
US3628164A US749391A US3628164DA US3628164A US 3628164 A US3628164 A US 3628164A US 749391 A US749391 A US 749391A US 3628164D A US3628164D A US 3628164DA US 3628164 A US3628164 A US 3628164A
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United States
Prior art keywords
resistor
grid
source
anode
network
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Expired - Lifetime
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US749391A
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English (en)
Inventor
Leonid Mikhailovich Tikhomirov
Vitally Ivanovich Loban
Valentina Alexandrovna Savina
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Assigned to INTERMEDICS INTRAOCULAR, INC., A TEXAS CORP., CALCITEK, INC., A TEXAS CORP., CARBOMEDICS, INC., A TEXAS CORP., INTERMEDICS CARDIASSIST, INC., A TEXAS CORP., NEUROMEDICS, INC., A TEXAS CORP., AMERICAN PACEMAKER CORPORATION, A MASSACHUSETTS CORP., SURGITRONICS CORPORATION, A TEXAS CORP., INTERMEDICS, INC., A TEXAS CORP. reassignment INTERMEDICS INTRAOCULAR, INC., A TEXAS CORP. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: B. A. LEASING CORPORATION
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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
    • H03K4/86—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
    • 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
    • H03K4/24—Boot-strap generators
    • 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

  • the system is built around a cold cathode glow discharge tube having an anode, a grid, a trigger electrode and a cathode, a first source of positive potential connected to the anode through a first resistor, a capacitive network connected to the anode and the first resistor to form a sawtooth wave generator for the output of the discharge tube, a resistor network connected between the trigger electrode and the grid, at source of synchronizing pulses supplied through the first portion of the resistor network to the triggering electrode and through a second portion of the resistor network to the grid, and a second source of positive potential connected through a second resistor to the resistor network.
  • the present invention relates to television, and more particularly to frame time base systems for television receivers.
  • the prior art includes frame time bases for television receivers, using cold-cathode glow discharge tubes. in such time bases, the tube has a cathode, a trigger electrode, a grid, and an anode sequentially arranged.
  • the trigger electrode serves to reduce the erratic delay in starting the main-gap discharge and is connected to a source through a currentlimiting resistor.
  • the grid is held positive with respect to the cathode and is fed frame-synchronizing pulses.
  • a disadvantage of prior art frame time base systems is that variations in the starter-gap discharge current, bias voltage or supply voltage impairs the synchronization such that additional controls are provided for adjustment.
  • An object of the present invention is to provide a frame time base system which dispenses with the need for additional adjustment controls and is capable of stable synchronization even under the influence of marked variations in the voltages applied and the ratings of the circuit components.
  • a frame time base system using a cold-cathode glow discharge tube whose anode circuit contains an RC-network to produce a sawtooth voltage, in which, according to the invention, there are resistors placed between the trigger electrode and the grid in order to decrease the grid potential with respect to the trigger electrode in the course of time base operation, while the circuit through which the grid is fed synchronizing (sync). pulses contains some of these resistors whose resistance is made sufficiently high to prevent relaxation oscillations occurring in the electrode circuits.
  • the anode breakdown voltage is held fixed and the stability of synchronization is maintained due to the fact that variations in the starter gap discharge current compensate for variations in the grid potential.
  • a frame time base system comprises a cold-cathode glow discharge tube 1 in which a trigger electrode 2 and a grid 3 are sequentially arranged between a cold cathode l and an anode 5.
  • a trigger electrode 2 and a grid 3 are sequentially arranged between a cold cathode l and an anode 5.
  • an RC-network network made of a resistor 6 connected to a source E and series capacitors 7 and ii.
  • the capacitor h blocks the DC component due to E, from the sawtooth voltage derived across the capacitor 7.
  • the trigger electrode is connected through a resistor 9 to another source E in some cases, the resistors 6 and 9 may be connected to the positive side of a common source.
  • the grid 3 is connected through series resistors 10 and ill to the trigger electrode 2.
  • the vertical scan sync. pulse source (omitted in the schematic) is connected to the common junction of the resistors 10 and 1111 through a DC blocking capacitor 112.
  • connection of the vertical scan sync. pulse source through the capacitor 112 as shown in the schematic may cause relaxation oscillations in the trigger electrode and grid circuits; to prevent them.
  • the resistors 110 and ill have sufficiently high values of resistance.
  • the output sawtooth voltage of the frame time base herein disclosed is derived in the conventional manner.
  • the capacitors 7 and 8 are charged by the source E, through the resistor 65.
  • the anode voltage reaches the breakdown value or when a sync. pulse is applied to the grid 3 through the resistor lit the capacitors 7 and h discharge through the tube l.
  • the relatively low rate of charge of the capacitor 7 and its rapid dischar e result in sharp sawtooth voltage pulses at the output.
  • the etailed description that follows describes the portion of the time base responsible for the stable synchronization of the frame frequency.
  • a triggering discharge occurs across the startergap between the trigger electrode 2 and the cathode 3, characterized by a constant voltage drop over a broad range of current. Since the grid 3 is placed near the trigger electrode 2, a transfer current begins to flow between the grid and the starter-gap discharge, giving rise to a voltage drop across the resistors and ill and reducing the potential at the grid 3 relative to the trigger electrode 2. The transfer current and, consequently, the fall of the grid potential increase with increase of the starter-gap current. In coldcathode glow discharge tubes, the anode breakdown voltage decreases with increase of starter-gap current and of grid potential.
  • connection of the electrodes 3 and 2 through the resistors lit) and ill provides for the stabilization of the anode breakdown voltage.
  • the starter-gap current should increase due to an increase in the supply voltage or the aging of the resistor 9 or the tube 1, the transfer current will also increase, further decreasing the potential at the grid 3, thereby stabilizing the anode breakdown voltage.
  • a decrease in the starter-gap current reduces the potential at the grid 3, and the anode breakdown voltage is again stabilized.
  • the invention herein disclosed provides for stable synchronization with small-amplitude sync. pulses against marked variations in supply voltage and two-fold changes in resistor ratings, and also makes redundant any synchronization adjustment controls.
  • a frame time base system for television receivers and the like comprising a cold-cathode glow discharge tube having an anode, a grid, a trigger electrode and a cathode, a first source of positive potential connected to said anode through a first resistor, a capacitive network connected to said anode and said first resistor to form a sawtooth wave generator for the output of said discharge tube, a resistor network connected between said trigger electrode and said grid, a source of synchronizing pulses supplied through a first portion of said resistor network to said triggering electrode and through a second portion of said resistor network to said grid, and a second source of positive potential connected through a second resistor to said resistor network.
  • said capacitive network include, first and second capacitors connected in series between said anode and a point of ground potential, said sawtooth waveform being developed across said second capacitor.
  • said resistor network is formed by third and fourth resistors connected in series, said triggering electrode connected to one end of said third resistor, said grid connected to one end of said fourth resistor, said source of synchronizing pulses applied to the other ends of said third and fourth resistors, said other ends being connected together.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US749391A 1968-07-17 1968-08-01 Frame time base for television receivers Expired - Lifetime US3628164A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NL6810112A NL6810112A (enrdf_load_stackoverflow) 1968-07-17 1968-07-17
US74939168A 1968-08-01 1968-08-01
GB39100/68A GB1185966A (en) 1968-07-17 1968-08-15 A time-base for television receivers
DE1762852 1968-09-10
FR6915677A FR2041727B1 (enrdf_load_stackoverflow) 1968-07-17 1969-05-14

Publications (1)

Publication Number Publication Date
US3628164A true US3628164A (en) 1971-12-14

Family

ID=27509954

Family Applications (1)

Application Number Title Priority Date Filing Date
US749391A Expired - Lifetime US3628164A (en) 1968-07-17 1968-08-01 Frame time base for television receivers

Country Status (5)

Country Link
US (1) US3628164A (enrdf_load_stackoverflow)
DE (1) DE1762852B1 (enrdf_load_stackoverflow)
FR (1) FR2041727B1 (enrdf_load_stackoverflow)
GB (1) GB1185966A (enrdf_load_stackoverflow)
NL (1) NL6810112A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416391A (en) * 1992-07-31 1995-05-16 Correa; Paulo N. Electromechanical transduction of plasma pulses
US20060042251A1 (en) * 2004-08-30 2006-03-02 Villalobos Victor M Arc-electrolysis steam generator with energy recovery, and method therefor
US20060042955A1 (en) * 2004-08-30 2006-03-02 Villalobos Victor M Arc-hydrolysis fuel generator with supplemental energy recovery
US20060201157A1 (en) * 2005-03-11 2006-09-14 Villalobos Victor M Arc-hydrolysis steam generator apparatus and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058738A (en) * 1933-10-23 1936-10-27 Radio Res Lab Inc Electrical circuit for cold cathode tubes
US2185189A (en) * 1935-11-07 1940-01-02 Germeshausen Kenneth Joseph Gaseous discharge tube
US2578525A (en) * 1946-02-06 1951-12-11 Marcellus S Merrill Electronic control
US2591511A (en) * 1948-10-28 1952-04-01 Trist & Co Ltd Ronald Voltage unbalance indicating system
US2883535A (en) * 1956-03-15 1959-04-21 Creveling Robert Thyratron switch
US3113240A (en) * 1959-05-25 1963-12-03 Collins Radio Co Fast switching bistable thyratron control circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB623207A (en) * 1946-09-24 1949-05-13 Submarine Signal Company Londo Improvements in or relating to pulse generators
NL148552C (enrdf_load_stackoverflow) * 1948-09-21
DE1007806B (de) * 1955-05-05 1957-05-09 Fernseh Gmbh Anordnung zur Erzeugung von Saegezahnstroemen
US3164778A (en) * 1961-08-21 1965-01-05 Thompson Ramo Wooldridge Inc Linear sweep circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058738A (en) * 1933-10-23 1936-10-27 Radio Res Lab Inc Electrical circuit for cold cathode tubes
US2185189A (en) * 1935-11-07 1940-01-02 Germeshausen Kenneth Joseph Gaseous discharge tube
US2578525A (en) * 1946-02-06 1951-12-11 Marcellus S Merrill Electronic control
US2591511A (en) * 1948-10-28 1952-04-01 Trist & Co Ltd Ronald Voltage unbalance indicating system
US2883535A (en) * 1956-03-15 1959-04-21 Creveling Robert Thyratron switch
US3113240A (en) * 1959-05-25 1963-12-03 Collins Radio Co Fast switching bistable thyratron control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416391A (en) * 1992-07-31 1995-05-16 Correa; Paulo N. Electromechanical transduction of plasma pulses
US20060042251A1 (en) * 2004-08-30 2006-03-02 Villalobos Victor M Arc-electrolysis steam generator with energy recovery, and method therefor
US20060042955A1 (en) * 2004-08-30 2006-03-02 Villalobos Victor M Arc-hydrolysis fuel generator with supplemental energy recovery
US20060201157A1 (en) * 2005-03-11 2006-09-14 Villalobos Victor M Arc-hydrolysis steam generator apparatus and method
US7216484B2 (en) 2005-03-11 2007-05-15 Villalobos Victor M Arc-hydrolysis steam generator apparatus and method

Also Published As

Publication number Publication date
DE1762852B1 (de) 1971-01-07
FR2041727A1 (enrdf_load_stackoverflow) 1971-02-05
FR2041727B1 (enrdf_load_stackoverflow) 1974-03-15
NL6810112A (enrdf_load_stackoverflow) 1970-01-20
GB1185966A (en) 1970-04-02

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Owner name: CALCITEK, INC., A TEXAS CORP., STATELESS

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B. A. LEASING CORPORATION;REEL/FRAME:004603/0607

Effective date: 19860813

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