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US2194572A - Television apparatus - Google Patents

Television apparatus Download PDF

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Publication number
US2194572A
US2194572A US131688A US13168837A US2194572A US 2194572 A US2194572 A US 2194572A US 131688 A US131688 A US 131688A US 13168837 A US13168837 A US 13168837A US 2194572 A US2194572 A US 2194572A
Authority
US
United States
Prior art keywords
relaxation
deflecting
anode
condenser
cathode ray
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
US131688A
Other languages
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 US2194572A publication Critical patent/US2194572A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/74—Deflecting by electric fields only
    • 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

  • the present invention relates to relaxation circuits for television arrangements and represents an improvement for the known relaxation circuit used for performing the deflection of the cathode ray in Braun tubes.
  • control electrode of the tube is linked up negatively with high potential against earth. This causes difiiculties in the television 25 modulation.
  • Figs. 2, 3 and 4 show embodiments of the invention.
  • Fig. 1 explains the principle of such a circuit.
  • the anode battery i of the cathode ray tube is earthed with its one pole, which is simultaneously connected with cathode 2.
  • the anode .3 is connected with the high potential.
  • l is the control grid, which is connected with areceiver E.
  • the one deflecting plate 5 is connected with the anode.
  • the other deflecting plate 5 must be coupled by way of a condenser i with the relaxationcircuit, and simultaneously it is connected with the anode by way of a leak resistance 8.
  • the relaxation circuit consists of a charging condenser 9 and charging resistance it.
  • the anode potential I For charging purposes there is employed the anode potential I.
  • the discharge may be performed in any known manner. In Fig.
  • a hot cathode grid controlled glow discharge tube H In this circuit a resistance 12 is necessary in any case, and the coupling. with the plates preferably takes place, not at the condenser 9, but at the hot cathode grid controlled glow discharge tube H.
  • the circuit 7/8 represents a load on the relaxation circuit amounting to 0.3 megohm. This load is already large as compared with the charging resistance ill, or the charging resistance H3 would require to be made still smaller than 0.3-megohmif the relaxation arrangement is to operate in the idle condition.
  • R10 itself is made smaller than R8.
  • the output in the 55 relaxation circuit is adjusted to be very much smaller than in accordance with the above values.
  • the circuit then no longer operates in idle condition, but appears to be very greatly loaded.
  • the relaxation curve at the plate 6 is distorted accordingly.
  • the distortion appears in the form of a flattening effect in the direction towards the ignition point.
  • the coupling between relaxation condenser and deflecting plate is made to be dependent on the frequency viz., in such fashion that low frequencies are transmitted better than high frequencies.
  • Figs. 2 and 3 showv two possible embodiments of such an improved coupling.
  • the anode battery l charges the condenser 9 byway of resistance L
  • the tube H discharges the condenser 9.
  • the deflecting plate 5 is coupled with the tapping of the resistance It] by way of the blocking condenser 7 which is proof against high tension, and with the anode by means of the leak resistance 8.
  • the tapping at the resistance ill is so adjusted that the part of. this resistance, which is connected to the plate 6, is greater than the reactance of the condenser Q in respect of the lowest relaxation frequency, i. e., the number of relaxations per second.
  • the lowest relaxation frequency i. e., the number of relaxations per second.
  • a disadvantage of the method according to Fig. 2 is a loss of size caused by the potential distribution 10/8. This disadvantage is exhibited to smaller extent by the corrected coupling according to Fig. 3.
  • the relaxation condenser 9 is charged in the usual manner by way of the charging resistance Hi and discharged byway of the hot cathode grid controlled glow discharge tube H and resistance I2. Coupling is also effected in usual manner by way of a blocking condenser i in direct fashion with the anode of the glow discharge tube H.
  • the coupling, however,in 'accordance with the invention is performed via a high-frequency filter /16 before it is connected with the deflecting plate 6.
  • the filter 15/16 there is evidently caused, exactly in the same manner shown in Fig, 2, a weakening of the higher relaxation harmonics and there oc-- curs a correction of the distortions arising from the load.
  • the amplitude .efiiciency is somewhat better than in Fig. 2, as the load is reduced by the filtering series resistance l5.
  • the two plates 5 and 6 in accordance with Fig. 4 are disposed behind a screening means 17/18 ofspecial form.
  • This screening means is directly connected with the anode 3 or is weakly positively biassed in relation thereto. It consists of very thin wires, which are disposed in the longitudinal direction, i. e., parallel to the ray. There may also be employed wire nets. The reciprocal of the plates 5 and B through these wires should be made as large as possible.
  • the plates 5 and 6 are now linked up directly or by Way of the leak resist ance 8 with a bias which is negative in relation to the anode potential.
  • This bias may be derived at a tapping iii of the anode-battery i.
  • the bias 39, negative in relation to the anode is made to be equal to or greater than the highest positive oscillation peak of the deflecting potential at 6.
  • the leak resistance a may be made of the order of It) to 20 megohms.
  • the slowest relaxation frequency may then be transmitted with a correspondingly small condenser of approximately 1,000 cm., and the relaxation apparatus may be allowed to operate with very small output, the charging resistance it! having several megohms, the charging condenser i! being comparatively small (0.02 mi.) and the charging output being equal to C9 e9 i. e., proportional to C, so that it accordingly remains small.
  • a television apparatus comprising a cathode ray tube, having a cathode, an anode and at least one pair of deflecting plates, a relaxation oscillator for generating a linear saw tooth voltage deflecting the cathode ray in said cathode ray tube. and a source of high direct voltage, said anode of the cathode ray tube being connected to said high voltage source, at least one of said deflecting plates being for a time more positive than the cathode ray effecting a current in the deflecting circuit. and means to prevent distortions of the deflecting curve of said cathode ray caused by said current in the deflecting circuit loading said relaxation generator.
  • a television apparatus comprising a cathode ray tube, having a cathode, an anode and at least one pair of deflecting plates, at relaxation oscillator for generating a linear saw tooth voltage deflecting the cathode ray in said cathode ray tube, and a source of high direct voltage, said anode of the cathode ray tube being connected to said high voltage source, the positive terminal of which being connected directly to the anode of said cathode ray tube, to one of said deflecting plates and to the input of said relaxation oscillator, the other deflecting plate being connected via a leak resistance to the anode of said cathode ray tube and via a condenser to the output of said relaxation generator, at least one of said deflecting plates being for a time more positive than the cathode ray effecting a current in the deflecting circuit, and means to prevent distortions of the deflecting curve of said cathode ray caused by said current in the deflecting
  • a television apparatus comprising a cathode ray tube, having a cathode. an anode and at least one pair of deflecting plates, a relaxation oscillator for generating a linear saw tooth voltage deflecting the cathode ray in said cathode ray tube, and a source of high direct voltage, said anode of the cathode ray tube being connected to said high voltage source, at least one 5 of said deflecting plates being for a time more positive than the cathode ray eifecting acurrent in the deflecting circuit, and coupling means between said relaxation oscillator and said deflecting circuit favouring the lower frequencies in order to prevent distortions of the deflecting curve of said cathode ray caused by said current in the deflecting circuit loading said relaxation 5,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US131688A 1936-03-21 1937-03-18 Television apparatus Expired - Lifetime US2194572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE492276X 1936-03-21

Publications (1)

Publication Number Publication Date
US2194572A true US2194572A (en) 1940-03-26

Family

ID=6544387

Family Applications (1)

Application Number Title Priority Date Filing Date
US131688A Expired - Lifetime US2194572A (en) 1936-03-21 1937-03-18 Television apparatus

Country Status (3)

Country Link
US (1) US2194572A (fr)
FR (1) FR819445A (fr)
GB (1) GB492276A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479426A (en) * 1945-11-30 1949-08-16 Gen Electric Impulse testing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479426A (en) * 1945-11-30 1949-08-16 Gen Electric Impulse testing

Also Published As

Publication number Publication date
FR819445A (fr) 1937-10-19
GB492276A (en) 1938-09-16

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