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US2265620A - Scanning current generator - Google Patents

Scanning current generator Download PDF

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Publication number
US2265620A
US2265620A US310290A US31029039A US2265620A US 2265620 A US2265620 A US 2265620A US 310290 A US310290 A US 310290A US 31029039 A US31029039 A US 31029039A US 2265620 A US2265620 A US 2265620A
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United States
Prior art keywords
grid
coil
current
circuit
scanning
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Expired - Lifetime
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US310290A
Inventor
Bahring Herbert
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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
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • 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
    • H03K4/26—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 current is produced through an inductor
    • H03K4/28—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 current is produced through an inductor using a tube operating as a switching device
    • H03K4/32—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 current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
    • H03K4/34—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 current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses using a single tube with positive feedback through a transformer
    • 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
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen

Definitions

  • This invention relates to scanning current generators particularly for television apparatus in which a saw-tooth current i produced for deflecting the cathode ray of a cathode ray tube.
  • Generators of this type usually contain a thermionic tube in combination with a transformer having coils connected in the anode and grid circuits of the tube.
  • the biasing potential for the grid is produced in such a manner that in spite of large grid currents a loss of energy in the grid circuit resistance is avoided.
  • At least an essential part of the grid resistance is formed by a current consumer, for example, by the of one or more amplifier tubes, cathode ray tubes, diodes etc. arranged in other parts of the complete circuit.
  • a small adjustable resistance is arranged in series with the current consumer. This adjustable resistance uses up only a small amount of energy. It is used for controlling the grid bias of the generator tube and thereby the frequency of the generator.
  • the figure shows a circuit arrangement of a saw-tooth current generator of the transformer type in which the tube i co-operates with the transformer 2 in such a manner that saw-tooth current are produced flowing through the deflecting coils 3.
  • the transformer has three windings, whereof the winding 5 is connected to the grid of the tube, the central winding of the anode, and winding 9 is inductively coupled with the anode coil and the grid coil.
  • the other end of the grid coil is connected to an adjustable small resistance element 5 and by way of the terminal 6 to a number of heating filaments 1 of tubes 8.
  • These tubes are arranged in another part of the television apparatus for example a receiver circuit.
  • the circuits of these tubes may be of conventional type and are not shown in the drawing.
  • the grid resistance formed by resistance element 5 and the heating elements I is arranged in parallel to a condenser and connected to the negative pole 01' a source of potential.
  • the drawing shows furthermore that the anode potential for the cathode ray tube is produced from the high voltage peaks occurring during the back-stroke of the saw-tooth current.
  • a diode I0 and a smoothing condenser H is arranged for this purpose; the high potential is taken off at the terminals l2.
  • a bridge circuit is arranged consisting of a potentiometer l3 and the resistances I4 and I5.
  • the output winding 9 has furthermore a number of contact points l9.
  • the movable'contact I8 can be connected with one of these contacts so that a smaller or larger part of the coil 9 is shunted across the series combination of coil l6 and resistance ll. This arrangement allows a control of the amplitude of the aw-tooth current without changing the anode potential.
  • This manner of controlling the position and size of the scanning pattern is of particular importance in connection with the form of grid circuit described above. It is preferable to arrange the current consuming elements on the cathode side of the grid coil 4. This arrangement would not allow a shifting of the scanning pattern if the grid coil and output coil would be connected galvanically because in this case the potential at the ends of the grid coil would be kept at a certain value and a shifting of the whole scanning pattern would not be possible. It is therefore essential that the deflecting arrangement containing a current consumer connected to the cathode side of the grid coil has separate grid and output windings and an adjusting bridge in the output circuit.
  • the invention i not limited to this particular type of a scanning generator, but it can be used in all arrangements containing a grid circuit carrying a large grid current so that energy is lost in the grid resistance.
  • the television apparatus contains a cathode ray tube provided with a concentrating coil it is advantageous to insert this concentrating coil into the grid circuit of the scanning generator so that the grid current is flowing through this coil.
  • This arrangement is particularly useful in television receivers but it can also be used in connection with television transmit connected in said grid circuit, a second electron discharge tube having a filament, said frequencydetermining element comprising a resistance element connected in series relation with said filament, and a condenser connected in parallel relation with said resistance element and said filament for providing said control grid with the proper operating bias.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Description

Dec. 9, 1941 H. BAHRI G SCANNING ,CURRENT GENERATOR Filed Dec. 21, 1939 INVENTOR RING Patenied Dec. 9 E941 SCANNING CURRENT GENERATOR Herbert Bfihring, Klein Machnow, near Berlin, Germany Application December 21, 1939, Serial No. 310,290
In G
1 Claim.
This invention relates to scanning current generators particularly for television apparatus in which a saw-tooth current i produced for deflecting the cathode ray of a cathode ray tube. Generators of this type usually contain a thermionic tube in combination with a transformer having coils connected in the anode and grid circuits of the tube.
It is an object of the present invention to provide a circuit arrangement for a scanning current generator of high eiiiciency and in which particularly a loss of energy in the grid circuit is avoided. It is a further object to insert into the grid circuit a current consuming element which ha at the same time another useful purpose in the complete arrangement. The biasing potential for the grid is produced in such a manner that in spite of large grid currents a loss of energy in the grid circuit resistance is avoided.
According to the invention at least an essential part of the grid resistance is formed by a current consumer, for example, by the of one or more amplifier tubes, cathode ray tubes, diodes etc. arranged in other parts of the complete circuit. A small adjustable resistance is arranged in series with the current consumer. This adjustable resistance uses up only a small amount of energy. It is used for controlling the grid bias of the generator tube and thereby the frequency of the generator.
Further particulars and advantages will be described in connection with the drawing showing by way of example an embodiment of the invention.
The figure shows a circuit arrangement of a saw-tooth current generator of the transformer type in which the tube i co-operates with the transformer 2 in such a manner that saw-tooth current are produced flowing through the deflecting coils 3. The transformer has three windings, whereof the winding 5 is connected to the grid of the tube, the central winding of the anode, and winding 9 is inductively coupled with the anode coil and the grid coil. The other end of the grid coil is connected to an adjustable small resistance element 5 and by way of the terminal 6 to a number of heating filaments 1 of tubes 8. These tubes are arranged in another part of the television apparatus for example a receiver circuit. The circuits of these tubes may be of conventional type and are not shown in the drawing. The grid resistance formed by resistance element 5 and the heating elements I is arranged in parallel to a condenser and connected to the negative pole 01' a source of potential.
ermany November 30, 1938 filament The operation of this device is similar to that of known scanning generators with the exception that the grid current flowing through the resistance element 5 and the heating elements I is not wasted but is consumed for a useful purpose, namely for heating the filaments I. This has the advantage that the energy consumption of the whole receiver containing-this circuit is lowered.
It is preferable to make the coupling between the output coil 9 and grid coil 5 as close as possible, for example, by winding the wires of both coils in parallel so that the grid-cathode space of tube I in combination with the biasing ar rangement lies practically parallel to the deflecting coils 3. This produces a more linear rise of the saw-tooth current flowing through the deflecting coils 3.
The drawing shows furthermore that the anode potential for the cathode ray tube is produced from the high voltage peaks occurring during the back-stroke of the saw-tooth current. A diode I0 and a smoothing condenser H is arranged for this purpose; the high potential is taken off at the terminals l2. This feature is disclosed and claimed in copending application Serial No. 254,593, filed February 4, 1939.
In order to enable a shifting of the scannin pattern on the screen of the cathode ray tube a bridge circuit is arranged consisting of a potentiometer l3 and the resistances I4 and I5. By moving the contact of potentiometer B it is possible to control the direction and amount of the D. C. component flowing through the deflecting coils. The output winding 9 has furthermore a number of contact points l9. The movable'contact I8 can be connected with one of these contacts so that a smaller or larger part of the coil 9 is shunted across the series combination of coil l6 and resistance ll. This arrangement allows a control of the amplitude of the aw-tooth current without changing the anode potential. This manner of controlling the position and size of the scanning pattern is of particular importance in connection with the form of grid circuit described above. It is preferable to arrange the current consuming elements on the cathode side of the grid coil 4. This arrangement would not allow a shifting of the scanning pattern if the grid coil and output coil would be connected galvanically because in this case the potential at the ends of the grid coil would be kept at a certain value and a shifting of the whole scanning pattern would not be possible. It is therefore essential that the deflecting arrangement containing a current consumer connected to the cathode side of the grid coil has separate grid and output windings and an adjusting bridge in the output circuit.
The invention i not limited to this particular type of a scanning generator, but it can be used in all arrangements containing a grid circuit carrying a large grid current so that energy is lost in the grid resistance.
In case the television apparatus contains a cathode ray tube provided with a concentrating coil it is advantageous to insert this concentrating coil into the grid circuit of the scanning generator so that the grid current is flowing through this coil. This arrangement is particularly useful in television receivers but it can also be used in connection with television transmit connected in said grid circuit, a second electron discharge tube having a filament, said frequencydetermining element comprising a resistance element connected in series relation with said filament, and a condenser connected in parallel relation with said resistance element and said filament for providing said control grid with the proper operating bias.
HERBERT BAHCRING.
US310290A 1938-11-30 1939-12-21 Scanning current generator Expired - Lifetime US2265620A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2265620X 1938-11-30
DE2284337X 1939-03-11

Publications (1)

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US2265620A true US2265620A (en) 1941-12-09

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US310290A Expired - Lifetime US2265620A (en) 1938-11-30 1939-12-21 Scanning current generator
US323348A Expired - Lifetime US2284337A (en) 1938-11-30 1940-03-11 Saw-tooth current generator

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Application Number Title Priority Date Filing Date
US323348A Expired - Lifetime US2284337A (en) 1938-11-30 1940-03-11 Saw-tooth current generator

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FR (1) FR872308A (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421520A (en) * 1943-06-18 1947-06-03 Rca Corp System for energizing the electrodes of cathode-ray devices from the deflecting circuit
US2441732A (en) * 1945-03-28 1948-05-18 Rca Corp Cathode heater supply from cathode-ray deflecting circuit
US2442305A (en) * 1945-11-19 1948-05-25 Farnsworth Res Corp Modulator
US2476164A (en) * 1947-04-21 1949-07-12 Hartford Nat Bank & Trust Co Circuit arrangement for generating a sawtooth-shaped current in a coil
US2494241A (en) * 1946-04-17 1950-01-10 Hartford Nat Bank & Trust Co Circuit arrangement producing a direct voltage for supplying a cathode-ray tube
US2512543A (en) * 1946-03-14 1950-06-20 Hartford Nat Bank & Trust Co Circuit arrangement for producing saw-toothlike currents
US2513225A (en) * 1946-09-06 1950-06-27 Rca Corp Power supply system
US2536712A (en) * 1947-05-27 1951-01-02 Rca Corp Protective system
US2536857A (en) * 1949-05-24 1951-01-02 Rca Corp High-efficiency cathode-ray deflection system
US2543719A (en) * 1949-07-29 1951-02-27 Rca Corp Deflection circuit
US2555827A (en) * 1948-10-26 1951-06-05 Rca Corp High-voltage power supply
US2562925A (en) * 1946-01-15 1951-08-07 Leon J Lader Sweep generator
US2566510A (en) * 1949-07-29 1951-09-04 Rca Corp Power supply system
US2574365A (en) * 1946-05-10 1951-11-06 Cossor Ltd A C Time base circuits
US2577112A (en) * 1948-04-09 1951-12-04 Rca Corp High-voltage power supply regulation
US2586310A (en) * 1948-02-28 1952-02-19 Westinghouse Electric Corp Blocking oscillator
US2588659A (en) * 1951-03-22 1952-03-11 Rca Corp High-voltage supply
US2611089A (en) * 1947-08-15 1952-09-16 Hartford Nat Bank & Trust Co Circuit arrangement for generating saw-tooth oscillations
US2621309A (en) * 1948-04-09 1952-12-09 Emi Ltd Circuits for producing saw tooth currents
US2627051A (en) * 1950-08-29 1953-01-27 Rca Corp Electron tube voltage protection circuit
US2628327A (en) * 1951-08-10 1953-02-10 Rca Corp High-voltage supply for cathode-ray tubes
US2658140A (en) * 1950-04-05 1953-11-03 Rca Corp Power supply for transformerless receivers
US2701310A (en) * 1949-01-12 1955-02-01 Du Mont Allen B Lab Inc Oscillatory high-voltage supply
US2713638A (en) * 1948-01-09 1955-07-19 Marconi Wireless Telegraph Co Saw tooth current wave generators
US2717328A (en) * 1952-08-04 1955-09-06 Kazan Benjamin Pulsed high voltage direct current power source
US2849606A (en) * 1953-03-25 1958-08-26 Sydney R Parker Amplitude comparison circuit
US2965806A (en) * 1953-07-22 1960-12-20 Philips Corp Trigger circuit

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495704A (en) * 1942-11-30 1950-01-31 Standard Telephones Cables Ltd Constant amplitude wave train generator
US2633530A (en) * 1945-10-19 1953-03-31 George P Wachtell Pulse generating circuit
US2597214A (en) * 1945-11-30 1952-05-20 Us Navy Pip selector
US2512699A (en) * 1945-12-06 1950-06-27 Us Sec War Radio pulse receiver interference eliminator
US2538261A (en) * 1947-09-09 1951-01-16 Philco Corp Synchronized relaxation oscillator
US2554925A (en) * 1947-10-17 1951-05-29 Rca Corp Saw-tooth wave generator
DE1045486B (en) * 1953-02-10 1958-12-04 Siemens Elektrogeraete Gmbh Circuit for generating a constant negative grid bias voltage from the grid circle of a tube in the deflection device of television receivers
DE1016322B (en) * 1954-04-24 1957-09-26 Philips Nv Receiver with automatic gain control
US2908747A (en) * 1954-06-29 1959-10-13 Rca Corp Color television receiver oscillator system
DE1083877B (en) * 1956-04-07 1960-06-23 Saba Gmbh Overlay receiver in which the amplitude of the oscillator vibrations is regulated
DE1183975B (en) * 1961-10-05 1964-12-23 Fritz Hellige & Co G M B H Fab Oscillator circuit for generating alternating current with constant amplitude
BE671046A (en) * 1964-10-19 1900-01-01

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421520A (en) * 1943-06-18 1947-06-03 Rca Corp System for energizing the electrodes of cathode-ray devices from the deflecting circuit
US2441732A (en) * 1945-03-28 1948-05-18 Rca Corp Cathode heater supply from cathode-ray deflecting circuit
US2442305A (en) * 1945-11-19 1948-05-25 Farnsworth Res Corp Modulator
US2562925A (en) * 1946-01-15 1951-08-07 Leon J Lader Sweep generator
US2512543A (en) * 1946-03-14 1950-06-20 Hartford Nat Bank & Trust Co Circuit arrangement for producing saw-toothlike currents
US2494241A (en) * 1946-04-17 1950-01-10 Hartford Nat Bank & Trust Co Circuit arrangement producing a direct voltage for supplying a cathode-ray tube
US2574365A (en) * 1946-05-10 1951-11-06 Cossor Ltd A C Time base circuits
US2513225A (en) * 1946-09-06 1950-06-27 Rca Corp Power supply system
US2476164A (en) * 1947-04-21 1949-07-12 Hartford Nat Bank & Trust Co Circuit arrangement for generating a sawtooth-shaped current in a coil
US2536712A (en) * 1947-05-27 1951-01-02 Rca Corp Protective system
US2611089A (en) * 1947-08-15 1952-09-16 Hartford Nat Bank & Trust Co Circuit arrangement for generating saw-tooth oscillations
US2713638A (en) * 1948-01-09 1955-07-19 Marconi Wireless Telegraph Co Saw tooth current wave generators
US2586310A (en) * 1948-02-28 1952-02-19 Westinghouse Electric Corp Blocking oscillator
US2621309A (en) * 1948-04-09 1952-12-09 Emi Ltd Circuits for producing saw tooth currents
US2577112A (en) * 1948-04-09 1951-12-04 Rca Corp High-voltage power supply regulation
US2555827A (en) * 1948-10-26 1951-06-05 Rca Corp High-voltage power supply
US2701310A (en) * 1949-01-12 1955-02-01 Du Mont Allen B Lab Inc Oscillatory high-voltage supply
US2536857A (en) * 1949-05-24 1951-01-02 Rca Corp High-efficiency cathode-ray deflection system
US2543719A (en) * 1949-07-29 1951-02-27 Rca Corp Deflection circuit
US2566510A (en) * 1949-07-29 1951-09-04 Rca Corp Power supply system
US2658140A (en) * 1950-04-05 1953-11-03 Rca Corp Power supply for transformerless receivers
US2627051A (en) * 1950-08-29 1953-01-27 Rca Corp Electron tube voltage protection circuit
US2588659A (en) * 1951-03-22 1952-03-11 Rca Corp High-voltage supply
US2628327A (en) * 1951-08-10 1953-02-10 Rca Corp High-voltage supply for cathode-ray tubes
US2717328A (en) * 1952-08-04 1955-09-06 Kazan Benjamin Pulsed high voltage direct current power source
US2849606A (en) * 1953-03-25 1958-08-26 Sydney R Parker Amplitude comparison circuit
US2965806A (en) * 1953-07-22 1960-12-20 Philips Corp Trigger circuit

Also Published As

Publication number Publication date
US2284337A (en) 1942-05-26
FR872308A (en) 1942-06-04

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