DE1052593B - Arrangement for generating a saw-tooth-shaped current of at least almost constant amplitude in the deflection coils of an electron beam tube - Google Patents
Arrangement for generating a saw-tooth-shaped current of at least almost constant amplitude in the deflection coils of an electron beam tubeInfo
- Publication number
- DE1052593B DE1052593B DEP16172A DEP0016172A DE1052593B DE 1052593 B DE1052593 B DE 1052593B DE P16172 A DEP16172 A DE P16172A DE P0016172 A DEP0016172 A DE P0016172A DE 1052593 B DE1052593 B DE 1052593B
- Authority
- DE
- Germany
- Prior art keywords
- deflection coils
- tube
- anode
- resistor
- resistance
- 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.)
- Pending
Links
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
- H03K4/90—Linearisation of ramp; Synchronisation of pulses
-
- 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
- H03K4/39—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 an amplifier
- H03K4/43—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 an amplifier combined with means for generating the driving pulses
Landscapes
- Details Of Television Scanning (AREA)
Description
Es ist bekannt, daß infolge der Erwärmung der Ablenkspulen einer Elektronenstrahlröhre, insbesondere der Bildablenkspulen einer Fernseh-Aufnahme- oder -Wiedergaberöhre, bei denen der Ohmsche Widerstand gegenüber dem induktiven Widerstand überwiegt, die Amplitude des Ablenkstromes und des damit verknüpften Ablenkfeldes sich ändern, wenn eine Röhre kleinen Innenwiderstandes als Verstärker benutzt wird.It is known that as a result of the heating of the deflection coils of a cathode ray tube, in particular of the image deflection coils of a television recording or playback tube, in which the ohmic Resistance over inductive resistance predominates, the amplitude of the deflection current and the The associated deflection field change when a tube has a small internal resistance as an amplifier is used.
Da die hierdurch bewirkte Änderung der Bildgröße unerwünscht ist, soll die Amplitude des Ablenkstromes wenigstens annähernd konstant gehalten werden. Dies ließe sich zwar erreichen durch Benutzen einer Pentode mit hohem Innenwiderstand, bei der der Ablenkstrom der Steuerspannung weitgehend proportional und unabhängig vom Außenwiderstand ist. Praktisch werden zwar meist Pentoden verwendet, diese sind jedoch zur Verbesserung der Sägezahnlinearisierung, zur Vermeidung von Überlastungen oder aus anderen Gründen vielfach stark gegengekoppelt, so daß sie wie Trioden einen verhältnismäßig niedrigen Innenwiderstand aufweisen und daher die Größe des Außenwiderstandes die Amplitude des Ablenkstromes beeinflußt.Since the resulting change in the image size is undesirable, the amplitude of the deflection current should be be kept at least approximately constant. This could be achieved by using a pentode with a high internal resistance, in which the deflection current is largely proportional to the control voltage and is independent of external resistance. In practice, pentodes are mostly used, However, these are to improve the sawtooth linearization and to avoid overloads or for other reasons often strongly negative feedback, so that they are like triodes a relatively have low internal resistance and therefore the size of the external resistance the amplitude of the deflection current influenced.
Um diese Nachteile zu vermeiden, ist es bereits bekannt, im Ladekreis des die Sägezahnspannung liefernden Kondensators einen temperaturabhängigen Widerstand einzuschalten, der in der Nähe der Ablenkspulen angeordnet ist. Es ergibt sich jedoch die Schwierigkeit, daß der schaltungsmäßig zu einem ganz anderen Stromkreis gehörende temperaturabhängige Widerstand entfernt von der zugehörigen Verstärkerröhre angebracht werden muß, damit er den entsprechenden Temperatureinflüssen ausgesetzt ist.In order to avoid these disadvantages, it is already known to use the sawtooth voltage in the charging circuit Capacitor to switch on a temperature-dependent resistor, which is close to the deflection coils is arranged. However, there is the problem that the circuitry to a temperature-dependent resistor belonging to a completely different circuit, removed from the associated amplifier tube must be attached so that it is exposed to the corresponding temperature influences.
Nach einem anderen Lösungsversuch wird eine Gegenkopplungsspannung einem parallel zu den Ablenkspulen liegenden Spannungsteiler entnommen, der ein temperaturabhängiges Element enthält. Hierbei bestehen zwar keine Schwierigkeiten hinsichtlich der örtlichen Unterbringung, aber wie auch beim erstgenannten Vorschlag tritt neben der Amp Ii tu den änderung leicht zusätzlich eine Änderung der Linearität ein, so daß diese Lösung praktisch auch nicht befriedigt. According to another attempted solution, a negative feedback voltage is applied in parallel to the deflection coils taken from lying voltage divider, which contains a temperature-dependent element. Here exist no difficulties in terms of local accommodation, but as with the former Proposal occurs in addition to the Amp II change slightly in addition to a change in linearity a, so that this solution is also practically unsatisfactory.
Weiter ist auch hier eine Verbindung von den Ablenkspulen zum Eingang der Kippröhre nötig, die vielfach störend ist. Da weiter die Spannung an den Ablenkspulen verhältnismäßig niedrig ist, ist auch die Gegenkopplungsspannung nicht sehr groß, so daß die Anordnung integrierender oder differentiierender oder anderer verformender Elemente im Rückführungskreis erschwert ist.A connection from the deflection coils to the entrance of the tilting tube is also necessary here is often annoying. Furthermore, since the voltage across the deflection coils is relatively low, so is the Negative feedback voltage is not very large, so that the arrangement is integrating or differentiating or other deforming elements in the feedback circuit is difficult.
Bei einer Anordnung zum Erzeugen eine sägezahnförmigen Stromes von wenigstens nahezu konstanter
Anordnung zur Erzeugung
eines sägezahnförmigen Stromes
von wenigstens nahezu konstanter
Amplitude in den Ablenkspulen
einer ElektronenstrahlröhreIn the case of an arrangement for generating a sawtooth-shaped current of at least an almost constant arrangement for generation
a sawtooth-shaped stream
of at least almost constant
Amplitude in the deflection coils
a cathode ray tube
Anmelder:
Philips Patentverwaltung G.m.b.H.,
Hamburg 1, Mönckebergstr. 7Applicant:
Philips Patentverwaltung GmbH,
Hamburg 1, Mönckebergstr. 7th
Dipl.-Ing. Gerhard Förster, Hamburg-Stellingen,
ist als Erfinder genannt wordenDipl.-Ing. Gerhard Förster, Hamburg-Stellingen,
has been named as the inventor
Amplitude in den ihren Innenwiderstand durch Erwärmung ändernden Ablenkspulen einer Elektronenstrahlröhre, insbesondere in den Bildablenkspulen einer Fernseh-Aufnahme- oder -Wiedergaberöhre, mit Hilfe einer Verstärkerröhre (Kippröhre) mit niedrigem Innenwiderstand, vorzugsweise einer gegengekoppelten Pentode und mit Hilfe eines nahe bei den Ablenkspulen angeordneten Kompensationswiderstandes werden diese Schwierigkeiten vollständig vermieden, und man erhält eine sicher wirkende Konstanthaltung des Ablenkstromes, wobei keine Verbindung aus der Ablenkeinheit heraus erforderlich ist, wenn gemäß der Erfindung eine direkte Kompensation der Widerstandsänderung der Ablenkspulen durch Einschaltung eines Kompensationswiderstandes mit negativem Temperaturkoeffizienten in Reihe mit den Ablenkspulen oder eines Kompensationswiderstandes mit positivem Temperaturkoeffizienten parallel zu den Ablenkspulen vorgesehen ist und wenn der Kompensationswiderstand in an sich bekannter Weise scheibenförmig ausgebildet ist.Amplitude in the deflection coils of a cathode ray tube, which change their internal resistance due to heating, especially in the image deflection coils of a television recording or playback tube, with the help an amplifier tube (tilt tube) with low internal resistance, preferably one with negative feedback Pentode and with the help of a compensation resistor arranged close to the deflection coils these difficulties are completely avoided, and you get a sure-acting constant maintenance of the Deflection current, with no connection from the deflection unit is required if according to the Invention a direct compensation of the change in resistance of the deflection coils by switching on a compensation resistor with a negative temperature coefficient in series with the deflection coils or a compensation resistor with a positive temperature coefficient parallel to the deflection coils is provided and if the compensation resistor is disc-shaped in a manner known per se is.
Der Kompensationswiderstand kann aus einem Material mit relativ hohem spezifischem Widerstand, z. B. aus oxydkeramischem Material, bestehen, aus dem die unter dem Namen »NTC-Widerstände« im Handel erhältlichen Bauelemente (Heißleiter) hergestellt sind.The compensation resistor can be made of a material with a relatively high specific resistance, z. B. made of oxide ceramic material, from which the under the name "NTC resistors" im Commercially available components (NTC thermistors) are made.
Durch die scheibenförmige Ausbildung wird ein vorzüglicher Wärmeaustausch mit der Umgebung und damit mit den benachbarten Ablenkspulen erreicht, so daß der Wert des Kompensationswiderstandes allein dadurch bedingt ist und von der Verlustwärme des hindurchfließenden Stromes nicht abhängt.Due to the disk-shaped design, an excellent heat exchange with the environment and thus achieved with the adjacent deflection coils, so that the value of the compensation resistor alone is caused by this and does not depend on the heat loss of the current flowing through it.
809 769/472809 769/472
Claims (2)
Deutsche Patentschrift Nr. 732 177;
britische Patentschrift Nr. 720 726;
USA.-Patentschriften Nr. 2 585 707, 2 596 590;
ETZ-B, Bd. 7, Heft 6, 1955, S. 220;
Radio Mentor, 1950, Heft 1, S. 31 bis 33 und 3< bis 43;Considered publications:
German Patent No. 732 177;
British Patent No. 720,726;
U.S. Patent Nos. 2,585,707, 2,596,590;
ETZ-B, Vol. 7, Issue 6, 1955, p. 220;
Radio Mentor, 1950, Issue 1, pp. 31 to 33 and 3 <to 43;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP16172A DE1052593B (en) | 1956-04-28 | 1956-04-28 | Arrangement for generating a saw-tooth-shaped current of at least almost constant amplitude in the deflection coils of an electron beam tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP16172A DE1052593B (en) | 1956-04-28 | 1956-04-28 | Arrangement for generating a saw-tooth-shaped current of at least almost constant amplitude in the deflection coils of an electron beam tube |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1052593B true DE1052593B (en) | 1959-03-12 |
Family
ID=7365898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP16172A Pending DE1052593B (en) | 1956-04-28 | 1956-04-28 | Arrangement for generating a saw-tooth-shaped current of at least almost constant amplitude in the deflection coils of an electron beam tube |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1052593B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE732177C (en) * | 1935-11-22 | 1943-03-02 | Siemens Ag | Flat cylindrical hot conductor |
US2585707A (en) * | 1950-12-29 | 1952-02-12 | Gen Electric | Hall effect alternating current volt-ampere meter |
US2596590A (en) * | 1948-09-02 | 1952-05-13 | Hartford Nat Bank & Trust Co | Television time base circuit |
GB720726A (en) * | 1952-02-21 | 1954-12-22 | Philips Electrical Ind Ltd | Improvements in or relating to amplifiers having negative feed-back |
-
1956
- 1956-04-28 DE DEP16172A patent/DE1052593B/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE732177C (en) * | 1935-11-22 | 1943-03-02 | Siemens Ag | Flat cylindrical hot conductor |
US2596590A (en) * | 1948-09-02 | 1952-05-13 | Hartford Nat Bank & Trust Co | Television time base circuit |
US2585707A (en) * | 1950-12-29 | 1952-02-12 | Gen Electric | Hall effect alternating current volt-ampere meter |
GB720726A (en) * | 1952-02-21 | 1954-12-22 | Philips Electrical Ind Ltd | Improvements in or relating to amplifiers having negative feed-back |
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