DE918883C - Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions - Google Patents

Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions

Info

Publication number
DE918883C
DE918883C DEF4432D DEF0004432D DE918883C DE 918883 C DE918883 C DE 918883C DE F4432 D DEF4432 D DE F4432D DE F0004432 D DEF0004432 D DE F0004432D DE 918883 C DE918883 C DE 918883C
Authority
DE
Germany
Prior art keywords
deflection
yoke
directions
simultaneous
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
Application number
DEF4432D
Other languages
German (de)
Inventor
Dipl-Ing Herbert Baehring
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Priority to DEF4432D priority Critical patent/DE918883C/en
Application granted granted Critical
Publication of DE918883C publication Critical patent/DE918883C/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70Arrangements for deflecting ray or beam
    • H01J29/72Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76Deflecting by magnetic fields only
    • H01J29/764Deflecting by magnetic fields only using toroidal windings

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)

Description

Es ist bekannt, zur gleichzeitigen Ablenkung des Kathodenstrahls in zwei zueinander senkrechte Richtungen ein geschlossenes Eisenjoch zu verwenden, auf dessen Schenkel je zwei parallel geschaltete Spulen angeordnet sind. Dies hat den Nachteil, daß im Ablenkraum bei vorhandenener Gleichstromkomponente auch starke Gleichfelder vorhanden sind, welche kompensiert werden müssen. Besondere Kompensationseinrichtungen erübrigen sich, falls man die Gleichstromkomponente von den Ablenkspulen fernhält. Zu diesem Zwecke schaltete man bisher in die Spulenzuleitung Kondensatoren ein, mußte jedoch, um eiren Verlust an Ablenkamplitude zu vermeiden, in die Gleichstromzuführung große Drosseln einführen. Dies bedingte große Gleichstromverluste.It is known to use a closed iron yoke for the simultaneous deflection of the cathode ray in two mutually perpendicular directions, on each of the legs of which two coils connected in parallel are arranged. This has the disadvantage that, if there is a direct current component, there are also strong direct fields in the deflection space which must be compensated. Special compensation devices are unnecessary if the direct current component is kept away from the deflection coils. For this purpose, capacitors have hitherto been switched on in the coil supply line, but large chokes had to be inserted in the direct current supply in order to avoid a loss of deflection amplitude. This resulted in large direct current losses.

Die Erfindung vermeidet diesen Nachteil. Erfindungsgemäß wird zur gleichzeitigen Ablenkung eines Kathodenstrahls in zwei Richtungen ein geschlossenes ferromagnetisches Ablenkjoch verwendet, bei dem für jede Ablenkrichtung ein aus zwei parallel geschalteten Teilspulen bestehendes Ablenksysteni vorhanden ist. Hierbei ist jeweils nur eine der Teilspulen von der Gleichstromkornponente durchflossen, und der Wicklungssinn und die Stromrichtung in diesen Teilspulen sind so gewählt, daß sich die Gleichfelder beider Systeme über das Eisenjoch schließen, während sich die Wechselfelder beider Systeme über den Luftraum schließen.The invention avoids this disadvantage. According to the invention for simultaneous deflection of a cathode ray in two directions a closed ferromagnetic deflection yoke used, in which one off for each deflection direction There is an existing deflection system with two sub-coils connected in parallel. Here the direct current component flows through only one of the sub-coils, and the winding sense and the current direction in these sub-coils are chosen so that the constant fields of both systems close over the iron yoke, while close the alternating fields of both systems over the airspace.

Im nachfolgenden wird die Erfindung an Hand der ein Ausführungsbeispiel darstellenden Figur beschrieben. Auf dem ferromagnetischen, geschlossenen Eisenj och befindet sich das aus den beiden Teilspulen S, und S, bestehende Zeilenablenhsystem. und das aus den beiden Teilspulen S, und S,' bestehende Bildablenk# system. Die beiden Teilspulen jedes Systems sind wechselstrommäßig über die Kondensatoren C, bzw. C, parallel geschaltet. Die von den beiden Ablenk-Systemen erzeugten Ablenkfelder besitzen im Ablenkr#um die durch die Pfeile angedeutete Richtung. Die von der Gleichstromkomponente der beiden Ablenkströme durchflossenen Teilspulen S, und S, besitzen einen derartigen Wicklungssinn, daß die hierdurch im Eisenjoch erzeugten Gleichfelder 0" und 012 denselben Richtungssinn haben. Infolgedessen schließt sich der magnetische Gleichfluß über das Eisenjoch, und im Ablenkraum ist praktisch kein Streufeld der Gleichstromkomponente vorhanden. Der Wicklungssinn, der von der halben Wechselstromkomponente durchflossenen und gleichstromfreien zweiten Teilspule jedes Ablenksystems ist hingegen derart gewählt, daß die von den beiden Teilspulen jedes Systems induzierten Wechselfelder 0"" und 0". gegeneinander gerichtet sind und sich daher über äen vom Ablenkjoch eingeschlossenen Ablenkraum durch die Luft schließen.The invention is described below with reference to the figure representing an embodiment. On the ferromagnetic, closed iron yoke is the line variable system consisting of the two partial coils S and S. and, 'comprising the two sub-coils S, and S Bildablenk # system. The two sub-coils of each system are connected in terms of alternating current through the capacitors C, and C in parallel. The deflection fields generated by the two deflection systems have the deflection force around the direction indicated by the arrows. The coils S, and S, through which the direct current component of the two deflection currents flows, have such a winding sense that the direct fields 0 "and 012 generated in the iron yoke have the same sense of direction The winding sense of the second coil section of each deflection system through which half the alternating current component flows and is free of direct current is selected in such a way that the alternating fields 0 "" and 0 "induced by the two coil sections of each system. are directed against each other and therefore close through the air over a deflection space enclosed by the deflection yoke.

Um jegliche Streuung des magnetischen Gleichfeldes durch den Luftraum zu vermeiden, ist es zweckmäßig, die vom Gleichstrom durchflossenen Windungen auf dem Jochumfang so zu verteilen, daß an jeder Stelle derselbe magnetische Fluß herrscht. Bedin2unz hierfür ist, daß an ieder Stelle p = Permeabilität, F = Jochquerschnitt). Das Joch kann auch als Ring ausgeführt werden. Windungszahl und Zeitkonstante der Teilspulen des gleichen Systems müssen einander gleich sein, da sonst Ausgleichsströme und Feldverzerrungen entstehen.In order to avoid any scattering of the magnetic constant field through the air space, it is advisable to distribute the windings through which the direct current flows on the yoke circumference in such a way that the same magnetic flux prevails at every point. The condition for this is that at each point p = permeability, F = yoke cross-section). The yoke can also be designed as a ring. The number of turns and the time constant of the partial coils of the same system must be the same, otherwise equalizing currents and field distortions arise.

Claims (1)

PATENTANSPRÜCHE'. i. Geschlossenes ferromagnetisches Ablenkjoch zur gleichzeitigen Ablenkung eines Kathodenstrahls in zwei Richtungen, dadurch gekennzeichnet, daß für jede Ablenkrichtung ein aus zwei parallel geschalteten Teilspulen (S, und Sl' bzw. S2 und S2') bestehendes Ablenksystem vorhanden ist, daß jeweils nur durch eine der beiden Teilspulen (S, bzw. S,) die Gleichstromkomponente fließt und daß der Wicklungssinn und die Stromrichtung in den Teilspulen so gewählt sind, daß sich die Gleichfelder (0", 0,12) beider Systeme über das Joch schließen, während sich die Wechselfelder (0"" 0",) beider Systeme über den Luftraum schließen. :2. Ablenkjoch nach Anspruch i, dadurch gekennzeichnet, daß die Windungszahl und die Zeitkonstante der Teilspulen des gleichen Ablenksystems einander gleich sind.PATENT CLAIMS '. i. Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode beam in two directions, characterized in that for each deflection direction there is a deflection system consisting of two parallel-connected partial coils (S, and Sl 'or S2 and S2'), that in each case only by one of the two Partial coils (S, or S,) the direct current component flows and that the winding sense and the current direction in the partial coils are selected so that the DC fields (0 ", 0.12) of both systems close over the yoke, while the alternating fields ( 0 "" 0 ",) close both systems over the airspace. : 2. Deflection yoke according to Claim i, characterized in that the number of turns and the time constant of the partial coils of the same deflection system are equal to one another.
DEF4432D 1944-05-18 1944-05-18 Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions Expired DE918883C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF4432D DE918883C (en) 1944-05-18 1944-05-18 Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF4432D DE918883C (en) 1944-05-18 1944-05-18 Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions

Publications (1)

Publication Number Publication Date
DE918883C true DE918883C (en) 1954-10-07

Family

ID=7084201

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF4432D Expired DE918883C (en) 1944-05-18 1944-05-18 Closed ferromagnetic deflection yoke for the simultaneous deflection of a cathode ray in two directions

Country Status (1)

Country Link
DE (1) DE918883C (en)

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