US2224113A - Television apparatus - Google Patents

Television apparatus Download PDF

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Publication number
US2224113A
US2224113A US674206A US67420633A US2224113A US 2224113 A US2224113 A US 2224113A US 674206 A US674206 A US 674206A US 67420633 A US67420633 A US 67420633A US 2224113 A US2224113 A US 2224113A
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US
United States
Prior art keywords
grid
potential
cathode
condenser
valve
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
Application number
US674206A
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English (en)
Inventor
Schlesinger Kurt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2224113A publication Critical patent/US2224113A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Definitions

  • Thesaid device consistsflof aseparatingfilter comprising a thermionic'valve'a'nda resistance in parallel therewith,,'inf connection with a condenser.
  • the potential mixture is conductedon the one hand-over the line '3 direct to the light controlapparatufsuor image reproducing deViceQpreL V I I er'ably a' Braun' tube, and o'n'the other handis passed o'n via the condenser 5 (of, for example, 7 v
  • the cathodes are connected with the condensers 'M and l5; which are charged withthe assistance of the chargingtubes l8 andl'9. "During the charging the-potential of the cathodes is shifted 40 into negative.
  • the synchronisation is wholly independent may be selected at approximately .1 megohm and 10 ,uf., the grid 2'! of the glow tube 16 of the line-control apparatus.
  • the line-control potential is taken from the terminal 20, the imagecontrol potential from the terminal 2
  • the value of the resistances l and I2 and the condensers l I and I3 may, generally speaking, preferably be such that the time constants r of the circuit I0, I! and 1- of the circuit I2, l3 are approximately -r 1O and 7 :10
  • Fig. 1 I have shown heating filaments immediately below the cathodes of the tubes or valves 6, H5, l1, l8, and I9, and I have also indicated a heating battery, that is, a battery for supplying the heating current to the filament located below the cathode 25 of the tube or valve 6. It will be understood that the heating filaments of the other tubes or valves are similarly connected with a source of current.
  • the grids 21, 30 of the glow tubes l6, I! receive a strong negative bias in relation to the respective cathodes.
  • the extent of the bias is determined by the tapping at the battery 8.
  • respectively is shifted into negative until the hot cathode has become negative to such extent that the blocking effect of the grid ceases and the discharge occurs.
  • the synchronising potential is conducted to the grid.
  • the grid bias is preferably so adjusted that a very small variation in potential of the grid (approximately .1 to .5 volt) is quite sufilcient to produce a discharge.
  • This additional synchronising potential is taken from the amplitude mixture with the assistance of the regulator B.
  • the diode 6 acting as a variable regulator produces a counter-acting 1 direct potentiaLby which the negative parts ,of
  • the amplitude mixture are allowed to pass and the positive parts with the exception of the amplitude peaks of the synchronising impulses are cut off.
  • a complete elimination of the peak potentials cannot take place, as the condenser charge flows off slowly overthe large leak resistance 9, so that the counter-potential produced by the variable regulator is at no time able to reach completely the value of the peak potential.
  • the potential of the grid 30 upon the arrival of a long synchronising impulse, and the potential of the grid 21 upon the arrival of every (i. e., both a long as well as a short) impulse will be shifted to a relatively small extent into positive. This slight displacement of the grid potential is suflicient, when using grid-controlled glow tubes, to control the tube and to synchronise the relaxation oscillations.
  • the synchronisation is accordingly controlled by the peak potential independently of the absolute value of the same. Accordof the absolute value of the image or synchronising potential.
  • the leak resistance 9 must be sufficiently large to prevent the condenser charge from flowing off too rapidly.
  • the condenser 5 on the other hand requires to be selected in such fashion that the variation in the absolute value of the potentials (contrast regulation or variation in the strength of field) is able to take place with sufficient rapidity.
  • the deflecting frequency may be varied in the manner known per se by variation of the condenser and of the charging current. This is easily accomplished when the valves [8 and I9 employed for the purpose of charging the condensers I4 and I5 respectively are screen grid valves as indicated in the drawing; I might, however, dispense with the screen grids and their connections, in which case the valves [8 and I9 would be diode valves of the same character as the valve 6.
  • the impulses reaching the receiver and amplifier I from the transmittter are a mixture of frequencies containing the frequency band of the image potentials and also the synchronizing voltages.
  • the curve A represents a control potential of maximum amplitude
  • curve B corresponds to about the minimum potential required for synchronizing purposes.
  • the amplitude peaks of the curve must extend to a certain amount beyond (above) the'initiating line indicated at I in Fig. 3.
  • the carrier wave may produce potentials such as represented by curve A, which lies en tirely above the initiating line and therefore would completely compensate the blocking efiect produced by the strongly'negativebias potential normally applied to the grid 21, 30 of the glowdischarge tubes l6 and I! respectively.
  • curve A This undesirable condition is remedied by my invention, according to which adjustments are made which will shift the position of the potential curveA into the negative region, that is to say, belowthe zero line indicated in'Fig. 3.
  • the means employed by me for this'purpose in the embodiments illustrated, consists of the regulating device comprising the condenser 5 and the valve 6 or 6, in conjunction with the resistance 9. This device operates as follows:
  • the arrangement according to the invention may be employed'in connection with all known control frequency methods. Since when making use of glow lamps of the grid type currents may be produced of almost any desired value, the arrangement may naturally also be employed for the operation of mechanical systems, for example Y those systems which operate with synchronising motors or the like.
  • a'multi-electrode valve might beemployed instead of the diode 6.
  • Fig. 2 shows a valve 6' which inaddition to the anode24 and the hot cathode 25 includes a grid 6".
  • the condenser 5 is connected with the, grid 5'', the other connections being the same as in Fig. 1.
  • a gaseous discharge relaxation oscillation generator having means adapted forconnection with said image reproducing device, a voltage source and means to connect said high voltage source with said generator, a condenser, a hot-cathode valve, the one electrode of said condenser being connected to the output terminal of said amplifier and'the other electrode to an electrode of said valve other than ing a receiving amplifier having an output terminal adapted for connection with an image reproducing device, a gaseous discharge relaxation oscillation generator having. means adapted for connection withs'aid imagesreproducing.device, a voltage source andim'eanstoconnect said voltage sourcewith said.
  • a condenser a" hotcathode valve including a. plate and a grid, the oneelectrode of said'condenser being connected to the output terminal ofsaid amplifier and the other electrode tothe grid of said-valve, aconnection from the plate of said valve to the input terminal of said generator, a connection between the plate andthe.cathode oifisaid valve, a resistan'ce included in the last-mentioned connection, and a directcurrentconnection from said' cathode tov a negative. point'tofsaid voltage source.
  • a television reception apparatus-comprising. areceiving amplifier having'anoutput terminal adapted .for. connection Withan imagereproducing. device, la-relaxation oscillation. generator having: means adapted. for connection with said image reproducing device, a voltage source and means to connectsaid voltage source with saidgenerator, at condenser; a hot-cathode two-electrode-valve comprising 'aplate and'a cathode,
  • the one electrode. of said condenser being'connected to the. outputyterminal of said; receiving amplifier and the other electrode to said plate of said valve. and to the input terminal of said generator and to said cathode, a resistance included in the connectionbetween saidother condenser electrode and saidcathodaand a connection from said cathode to a negative 'point of said voltage source.
  • a television reception apparatus comprising a receiving amplifier having a terminal adapted for connection with animage reproducing device, an anode voltage source, a relaxation oscillation generator comprising a grid-controlled v glow tube, a condenser connected with 'saidtube and meansconnected with said tube and said condenser, for chargingsuch condenser and producing the relaxation oscillation voltage, means for connecting the cathode of said glow tube with said reproducing device, the plate of said glow tube being connected to said anode, voltage source, the one electrode of said condenser being connected to said plate and the other electrode being connected to the cathode of said glow tube and to said relaxation oscillation voltage producing means, a further condenser, a valve having a hot cathode and a plate, a resistance, theone electrode of said last-mentioned condenser being connected to the output terminal of said receiving amplifier and the other electrode to the plate of said valve, a connection from said plate to the grid of said glow tube, another connection from said plate to one point
  • valve in which the resistance connectedwith said valve is of the order of 5x10 ohms.
  • a television reception apparatus comprising a receiving amplifier having a terminal adapted for connection with an image reproducing device, an anode voltage source, a relaxation oscillation generator, comprising two grid-controlled glow tubes for producing line and image deflecting voltages respectively, a condenser for each of said tubes, a valve associated with each of said tubes and condensers for producing the relaxation oscillation voltages, the plates of said tubes being connected to said anode voltage source, the one electrode of each said condensers being connected to said plates and the other electrode of each being connected to the cathode of the respective tube and to the plate of the respective Valves, 2.
  • a television apparatus comprising a receiving amplifier and a relaxation oscillation generator for producing the cathode-ray deflecting currents, said generator including an electronic tube provided with a grid, a source of electricity connected with said generator and having a tap connected with said grid to supply a biasing voltage, and a regulating device comprising another electronic tube, such last-mentioned tube having an anode and a cathode, said cathode being connected to the above-mentioned tap, and said anode being connected to the grid of the generator tube, the tube of the regulating device being also connected with the output of said amplifier.
  • a television apparatus comprising a receiving amplifier and a relaxation oscillation generator for producing the cathode-ray deflecting currents, said generator including anelectronic tube provided with a grid, a source of electricity connected with said generator and having a biasing tap connected with said grid, and a regulating device comprising another electronic tube, such last mentioned tube having an anode, a cathode, and a third electrode, a condenser the terminals of which are connected with said third electrode and with'the output of said amplifier respectively, the cathode of the last-mentioned tube being connected to the above-mentioned tap, and the anode of said tube being connected with the grid of the generator tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US674206A 1932-06-07 1933-06-03 Television apparatus Expired - Lifetime US2224113A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE420679X 1932-06-07

Publications (1)

Publication Number Publication Date
US2224113A true US2224113A (en) 1940-12-03

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ID=6453196

Family Applications (1)

Application Number Title Priority Date Filing Date
US674206A Expired - Lifetime US2224113A (en) 1932-06-07 1933-06-03 Television apparatus

Country Status (4)

Country Link
US (1) US2224113A (xx)
FR (1) FR756496A (xx)
GB (1) GB420679A (xx)
NL (1) NL48526C (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE407565A (xx) * 1934-03-17
DE766547C (de) * 1936-11-12 1954-08-09 Fernseh Gmbh Schaltung mit veraenderlichem Verstaerkungsgrad zur Verstaerkung von Bildzeichen
NL61922C (xx) * 1937-12-24

Also Published As

Publication number Publication date
GB420679A (en) 1934-12-06
FR756496A (fr) 1933-12-11
NL48526C (xx)

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