DE586454C - Method for the brightness modulation of the Braun oscillograph for television purposes and image telegraphy - Google Patents

Method for the brightness modulation of the Braun oscillograph for television purposes and image telegraphy

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Publication number
DE586454C
DE586454C DENDAT586454D DE586454DD DE586454C DE 586454 C DE586454 C DE 586454C DE NDAT586454 D DENDAT586454 D DE NDAT586454D DE 586454D D DE586454D D DE 586454DD DE 586454 C DE586454 C DE 586454C
Authority
DE
Germany
Prior art keywords
oscillograph
braun
brightness modulation
image
telegraphy
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
Application number
DENDAT586454D
Other languages
German (de)
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.)
WLADISLAW ZEITLIN DIPL ING
Original Assignee
WLADISLAW ZEITLIN DIPL ING
Publication date
Application granted granted Critical
Publication of DE586454C publication Critical patent/DE586454C/en
Expired legal-status Critical Current

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Classifications

    • 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
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation

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  • Transforming Electric Information Into Light Information (AREA)

Description

£Dipi.-3ng. Wladislaw Zeitlin in Berlin£ Dipi.-3ng. Wladislaw Zeitlin in Berlin

Verfahren zur Helligkeitsmodulation des Braunschen Oszillographen für Fernsehzwecke und BildtelegraphieMethod for the brightness modulation of the Braun oscillograph for television purposes and image telegraphy

Patentiert im Deutschen Reiche vom 18. Oktober 1930 abPatented in the German Empire on October 18, 1930

Bekanntlich gibt es Oszillographen mit am Fluoreszenzschirm liegendem Netz, welches die langsamen Kathodenstrahlen nachbeschleunigt und so eine ausreichende Fluoreszenzhelligkeit bewirkt.As is well known, there are oscilloscopes with a network on the fluorescent screen, which the slow cathode rays are accelerated and thus sufficient fluorescence brightness causes.

Die Erfindung betrifft eine Verbesserung dieses bekannten Verfahrens zur Helligkeitsmodulation bei solchen Glühkathodenoszillographen, indem statt der beschleunigenden Gleichspannung bzw. des pulsierenden Gleichstromes eine z. B. durch Bildimpulse eines Fernsehsenders modulierbare Hochfrequenzspannung an das Gitter vor dem Bildschirm gelegt wird. Die Verwendung von Hochfrequenzströmen für diesen Zweck an Stelle der bisher verwendeten Gleichstromsteuerströme bringt den Vorteil mit sich, daß die notwendige hohe Steuerspannung mit Hilfe einesTesla-Transformators bei Benutzung niedriger Anodenspannung gewonnen wird. Es wird daher die lebensgefährliche Hochspannungsquelle durch eine gefahrlose Spannungsquelle ersetzt.The invention relates to an improvement of this known method for brightness modulation in such hot cathode oscillographs, by instead of the accelerating direct voltage or the pulsating direct current a z. B. high-frequency voltage that can be modulated by image pulses from a television transmitter is placed on the grid in front of the screen. The use of high frequency currents for this purpose in place of the previously used direct current control currents has the advantage that the necessary high control voltage with the help of a Tesla transformer when using lower Anode voltage is obtained. It therefore becomes the life-threatening high voltage source replaced by a safe voltage source.

In der Zeichnung bedeutet 1 den Vakuumkolben des Oszillographen, 2 die Glühkathode, 3 das Sammelrohr zum Sammeln der Kathodenstrahlen, 4 die Anodenblende, 5 bis 8 die Ablenkvorrichtung für die Kathodenstrahlen, 9 das erste und 11 das zweite feine Gitternetz aus Metall, 12 die Glasscheibe mit der Fluoreszenzschicht. Der Kathodenstrahl wird von der Glühkathode 2 emittiert und trifft nach der geeigneten Ablenkung das erste Netz 9. Zwischen diesem Netz und der Kathode 2 besteht ein konstantes beschleunigendes Feld. Der Kathodenstrahl selbst ist auch von konstanter Intensität. Beim Durchdringen des Netzes 9 wird der Kathodenstrahl bei jeder positiven Phase der am Gitter 11 liegenden Hochfrequenz beschleunigt und erzeugt auf dem FluoreszenzIn the drawing 1 means the vacuum bulb of the oscilloscope, 2 the hot cathode, 3 the collecting tube for collecting the cathode rays, 4 the anode screen, 5 to 8 the deflection device for the cathode rays, 9 the first and 11 the second fine Metal grid, 12 the glass pane with the fluorescent layer. The cathode ray is emitted by the hot cathode 2 and hits after the appropriate deflection first network 9. Between this network and the cathode 2 there is a constant accelerating Field. The cathode ray itself is also of constant intensity. When penetrating the network 9 is the Cathode ray accelerated at each positive phase of the high frequency lying on the grid 11 and generated on the fluorescence

schirm verschieden helle Flecken, je nach der augenblicklichen Spannung der modulierten Hochfrequenzspannung, die von der sekundären Wicklung 14 der Tesla- Spule geliefert 45 wird. Die primäre "Wicklung 15 ist mit einem Röhrengenerator 17 verbunden, der durch die Rückkopplungsspule 16 zum Schwingen gebracht wird. Der Transformator 18 und 19 bewirkt die Gittermodulation der Hochfre- 50 quenzröhre 17. Die Gittermodulation erzeugt in der Hochfrequenzröhre 17 eine wechselnde Spannung, welche die obenerwähnte wechselnde Nachbeschleunigung der Kathoderistrahlen am Fluoreszenzschirm mittels des 55 Tesla-Transf ormators hervorruft. Es ist selbstverständlich, daß man hierbei verschiedene Modulationsschaltungen verwenden kann. Die Stromquelle 20 liefert den nötigen Strom. Das metallische Netzrohr bzw. die Verspiege- 60 lung 10 dient zur besseren Abschirmung der Kathodenstrahlen gegen Hochfrequenzspannung und schädliche Glasaufladungen. Die Erdung 13 soll das Auftreten von Hochfrequenzspannungen auf dem ersten Gitter 9 ver- 65 hindern. Diese Anordnung vermeidet Bildpunktverschiebungen und ermöglicht mit sehr geringer Anodenspannung von etwa 100 bis 200 Volt auszukommen, während das Aufleuchten der Fluoreszenzschicht durch leicht 70 modulierbare Hochfrequenzspannung hervorgerufen wird.screen of different bright spots, depending on the instantaneous tension of the modulated Radio frequency voltage supplied 45 by the secondary winding 14 of the Tesla coil will. The primary "winding 15 is with a Tube generator 17 connected, which is made to oscillate by the feedback coil 16 will. The transformer 18 and 19 causes the grid modulation of the high-frequency tube 17. The grid modulation generates in the high-frequency tube 17, a changing voltage which is the above-mentioned changing voltage Post-acceleration of the cathode rays on the fluorescent screen by means of the 55 Tesla transformers. It goes without saying that there are different Can use modulation circuits. The power source 20 supplies the necessary power. The metallic mesh tube or the mirroring 60 10 is used for better shielding of the Cathode rays against high frequency voltage and harmful glass charges. the Grounding 13 is intended to prevent high-frequency voltages from occurring on first grid 9 prevent. This arrangement avoids pixel shifts and enables very much low anode voltage of about 100 to 200 volts get by while the fluorescent layer lights up slightly through 70 modulatable high-frequency voltage is caused.

Claims (1)

Patentanspruch:Claim: Verfahren zur Helligkeitsmodulation des Braunschen Oszillographen für Fernsehempfang und Bildtelegraphie, dadurch gekennzeichnet, daß eine durch die Bildimpulse modulierte Hochfrequenzspannung über einen Tesla-Transformator an das vor dem Fluoreszenzschirm angeordnete Gitter gelegt wird.Method for the brightness modulation of the Braun oscillograph for television reception and image telegraphy, characterized in that a high frequency voltage modulated by the image pulses via a Tesla transformer to the one in front of the fluorescent screen Grid is placed. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DENDAT586454D Method for the brightness modulation of the Braun oscillograph for television purposes and image telegraphy Expired DE586454C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE586454T

Publications (1)

Publication Number Publication Date
DE586454C true DE586454C (en) 1933-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT586454D Expired DE586454C (en) Method for the brightness modulation of the Braun oscillograph for television purposes and image telegraphy

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DE (1) DE586454C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755240C (en) * 1934-12-21 1953-06-01 Marconi Wireless Telegraph Co Arrangement for the reception of television broadcasts with a Braun tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755240C (en) * 1934-12-21 1953-06-01 Marconi Wireless Telegraph Co Arrangement for the reception of television broadcasts with a Braun tube

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