EP0030704B1 - Magnetizing device for the convergence assembly of in-line colour picture tubes - Google Patents

Magnetizing device for the convergence assembly of in-line colour picture tubes Download PDF

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Publication number
EP0030704B1
EP0030704B1 EP80107753A EP80107753A EP0030704B1 EP 0030704 B1 EP0030704 B1 EP 0030704B1 EP 80107753 A EP80107753 A EP 80107753A EP 80107753 A EP80107753 A EP 80107753A EP 0030704 B1 EP0030704 B1 EP 0030704B1
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EP
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Prior art keywords
coils
neck
convergence
axis
colour
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EP80107753A
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German (de)
French (fr)
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EP0030704A2 (en
EP0030704A3 (en
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Erhard Kienle
Walter Kornaker
Felix Greiner
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Nokia Deutschland GmbH
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International Standard Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances

Definitions

  • the invention relates to a device for magnetizing the permanent magnetic convergence device of an inline color picture tube, in which a permanent magnet arranged in a longitudinal axis of the convergence device lying perpendicular to the z-direction of the color picture tube plane by means of coils arranged on the neck of the tube and generating an electromagnetic field in the direction of the convergence device plane. and is unmagnetizable.
  • Such a device is known from DE-A-2 832 667.
  • the coils which produce the magnetization (required for achieving static convergence) in the permanent magnet are arranged in four groups and in two planes one behind the other in the direction of the longitudinal axis of the tube, their shape being circular.
  • the known device is constructive very expensive and it has been shown that the setting of the static convergence with such a device can have an unfavorable effect on the shape stability.
  • a convergence device consisting of diametrically magnetized rings made of permanent magnetic ferrite material is described in the article in "Funkschau" (1976), No. 5 , Pages 59 and 60.
  • the object on which the invention is based is therefore to create a magnetizing device for magnetizing the static convergence device, which is to be as compact as possible and is to be arranged close to the convergence device and which acts on the convergence device in such a way that the convergence device in each case only one electron beam - independently of the other electron beams - experiences magnetizing influences.
  • This magnetization should also have the least possible influence on the shape of the electron beams.
  • the magnetic coils Since the magnetic coils have different dimensions, they are adapted to the shape of the convergence device. Since all coil dimensions lie in the plane of the convergence device, the smallest possible change in beam shape is guaranteed. By adapting the coil shape to the shape of the convergence device, it is possible to achieve very strong magnetizing fields. This allows the construction of magnetizing devices in which the coils, which are required to achieve a multi-pole field, can be arranged on circles with different radii around the tube neck. It has been found that such a device can even magnetize through a deflection system arranged around the tube neck. Novel deflection systems in fact extend over such a long area of the color picture tube neck that they still cover part of the electron gun. It was previously necessary to adjust the convergence and color purity before the deflection system was attached to the tube. The fields of the magnetizing device according to the invention are so strong, however, that the hard magnetic material attached to the tube neck can be magnetized or re-magnetized even through the deflection system already attached.
  • the convergence device made of hard magnetic material, which consists of a wire ring 1 with an air gap arranged in the interior of the color picture tube neck. This ring is arranged concentrically with the central electron beam 5. The electron beam direction is designated z. The ring is located in the convergence plane, which is perpendicular to the z-axis. Instead of the shape of a ring, the convergence device can also have a different shape.
  • Fig. 1 shows the wire ring 1 in the direction of view of the convergence device level, so that the wire ring 1 appears only as a line.
  • the rectangular, electrically excitable magnet coil 2 can be seen, the magnetic axis of which lies in the viewing direction.
  • the longer dimension of the coil 2 is parallel to the convergence device level. It can be seen that the coil shape is well adapted to the shape of the converging device.
  • the diameter of a round coil 3 which encloses the same area as the rectangular coil, is shown in broken lines.
  • Fig. 1 is easy to imagine that the rectangular coil generates a homogeneous field over the entire extent of the convergence device.
  • edge regions of the convergence device would be located in the inhomogeneous edge field of the coil.
  • the diameter of the round coil 3 would have to be larger. This would, however, only achieve a considerably weaker field with the same current flow in the coil. The maximum current flow is limited by the available voltage sources.
  • the mode of operation of a magnetizing device according to FIG. 2 is first described below, followed by information on the geometric dimensions and the electrical properties of the coils.
  • These six coils are operated in such a way that they impress a six-pole field into the wire ring 1, through which the two outer electron beams can be displaced in the x direction together with respect to the central electron beam.
  • eight further coils are arranged, the radially arranged magnetic axes of which each enclose angles of 45 °.
  • the four coils, the magnetic axes of which coincide with the x and y axes, are designated by 9.
  • Those four coils, the magnetic axes of which are each offset by 45 ° with respect to the x and y axes, are designated by 10.
  • the four coils 9 are operated in such a way that a four-pole field is impressed into the wire ring 1, with which the two outer beams 4 can be displaced relative to one another in the y direction, but the central electron beam 5 remains unaffected.
  • the four coils 10, on the other hand, are operated in such a way that a four-pole field is impressed into the wire ring 1, by means of which the two outer electron beams 4 are displaced relative to one another in the x direction, but the central electron beam 5 also remains unaffected.
  • the coils for the four-pole fields can also be arranged on two circular radii analogous to the six-pole coils.
  • All of the previously mentioned coils used to adjust the static convergence are arranged on circles with different radii.
  • elongated coils are required, which generate an identical, homogeneous field at the location of all three electron beams.
  • the magnetic axes of the color purity coils coincide with the y axis.
  • the two color purity coils 11 arranged in the y-direction above and below the coils described so far are operated in such a way that a two-pole field is created which shifts all three electron beams together by the same amount in the x-direction.
  • the possibility of a common deflection of all three electron beams in the y direction is desired for the raster adjustment.
  • two additional raster correction coils 12 are provided in the device according to FIG. 2, the magnetic axes of which coincide with the x-axis and which are located to the left and right of the convergence coils in the x-direction.
  • the coils 12 are also operated so that a two-pole field is created.
  • All coils have a rectangular shape.
  • the large dimensions of the color purity coils 11 and the raster correction coils 12 are approximately twice to three times as long as the diameter of the device for setting the static convergence in the x or y direction.
  • the large dimensions of the coils arranged on circles are each so large that all the coils on the circle form a closed circle.
  • the small dimension of all coils is about 1 cm.
  • the color purity and halftone correction coils each consist of 95 turns of a copper wire with a cross section of 0.5 mm 2.
  • the other coils consist of 150 turns of a copper wire with a cross section of 0.25 mm 2 .
  • the coils 12 provided for the basic deflection movement are each connected in series and excited with a capacitor of approximately 200 ⁇ F with a maximum of ⁇ 500 V. The achievable deflections lead to displacements of the electron beam landing points of up to ⁇ 15 mm on the screen of the color picture tube.
  • the magnetizing device described makes it possible to deflect the two outer electron beams together or against one another without influencing the central electron beam.
  • the magnetization is impressed into the material of the convergent device which can be magnetized and unmagnetized in a manner known per se, so that it is not dealt with in more detail here.
  • Fig. 3 shows a further embodiment of the Magnetizing device according to the invention, with each of which an outer electron beam 4 can be adjusted substantially independently of the middle and the other outer electron beam.
  • a permanent magnetic wire ring 3 is again to be provided in the tube neck 6 as a convergence device.
  • the dimensions of the device shown in FIG. 3 correspond to a magnetizing device which is provided for magnetizing a permanent-magnetic wire ring arranged inside a so-called thick-necked tube with an outside diameter of approximately 36 mm.
  • the structure and mode of operation of the color purity correction coils 11 and raster correction coils 12 correspond to those described in FIG. 2.
  • the wound magnetic coils 12 and 13 are shown only on the right and above, while only the unwound winding body can be seen below and left.
  • the shift of the right electron beam 4 in the x direction will first be described below.
  • the coils 13, the magnetic axes of which run parallel to the x axis or inclined at an angle thereto, are arranged one above the other in the y direction, but at equal intervals above and below the x axis. They are operated so that the polarity of one coil is exactly opposite to the polarity of the other coil. In this way, a magnetic field drawn in broken lines in FIG. 3 is generated in both coils, the field lines of which are closed via the wire ring 1.
  • the field lines at the location of the right outer electron beam 4 run essentially in the y direction, which causes this electron beam to be displaced in the x direction.
  • the displacement of the outer electron beam in the y direction is shown in FIG. 1 using the left outer electron beam 4.
  • the coil 14, the magnetic axis of which coincides with the x-axis, is excited in such a way that the coil forms the magnetic north and south poles shown.
  • the field lines close in a known manner outside the coil.
  • the left outer electron beam 4 is located in a dashed magnetic field in the x direction, which causes a deflection in the y direction.
  • the coil arrangements for deflecting an external electron beam in the x or y direction were only explained for one side of the magnetizing device. Since both coils 13 and 14 are present on each side in the magnetizing device, both outer electron beams 4 can be deflected independently of one another and independently of the central electron beam 5 individually in the x or y direction.
  • FIG. 4 shows the side view of the winding body on which the coils for raster correction 12 and for the independent deflection of an external electron beam in the x and y directions 13, 14 are wound in the device according to FIG. 3.
  • the distance of the winding body or the coil wound thereon from the tube neck 6 and from the convergence device 1 can be seen from FIG. 4.
  • the electrical design of the coil 12 corresponds to that described in FIG. 2.
  • the illustrated and described embodiments of the magnetizing device according to the invention are suitable for magnetizing a convergence device arranged inside the tube neck.
  • the same device, but with larger geometrical dimensions, can be used to magnetize a convergence device arranged on the outside of the tube neck or if the convergence device is arranged inside the tube neck, but parts of a deflection system are still located between the tube neck and the magnetizing device. It is a particular advantage of the magnetizing devices according to the invention that permanent magnetic materials arranged in the interior of the tube neck can also be magnetized through parts of the deflection system.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Magnetisieren der permanentmagnetischen Konvergenzeinrichtung einer Inline-Farbbildröhre, bei der ein in einer senkrecht zur in z-Richtung verlaufenden Farbbildröhrenlängsachse liegenden Konvergenzeinrichtungsebene angeordneter Permanentmagnet mittels am Hals der Röhre angeordneter, ein elektromagnetisches Feld in Richtung der Konvergenzeinrichtungsebene erzeugender Spulen auf- und unmagnetisierbar ist.The invention relates to a device for magnetizing the permanent magnetic convergence device of an inline color picture tube, in which a permanent magnet arranged in a longitudinal axis of the convergence device lying perpendicular to the z-direction of the color picture tube plane by means of coils arranged on the neck of the tube and generating an electromagnetic field in the direction of the convergence device plane. and is unmagnetizable.

Eine solche Vorrichtung ist aus der DE-A-2 832 667 bekannt. Bei der bekannten Vorrichtung sind die Spulen, welche die zur Erzielung der statischen Konvergenz erforderliche Magne-( tisierung im Permanentmagnet erzeugen, in vier Gruppen und in zwei in Richtung der Röhrenlängsachse hintereinander liegenden Ebenen angeordnet, wobei ihre Form kreisförmig ist. Die bekannte Vorrichtung ist konstruktiv sehr aufwendig und es hat sich gezeigt, daß das Einstellen der statischen Konvergenz mit einer solchen Vorrichtung ungünstige Auswirkungen auf die Strahlformbeständigkeit haben kann. Eine aus diametral magnetisierten Ringen aus permanentmagnetischen Ferritmaterial bestehende Konvergenzeinrichtung ist in dem Artikel in »Funkschau« (1976), Heft 5, Seiten 59 und 60 beschrieben.Such a device is known from DE-A-2 832 667. In the known device, the coils which produce the magnetization (required for achieving static convergence) in the permanent magnet are arranged in four groups and in two planes one behind the other in the direction of the longitudinal axis of the tube, their shape being circular. The known device is constructive very expensive and it has been shown that the setting of the static convergence with such a device can have an unfavorable effect on the shape stability. A convergence device consisting of diametrically magnetized rings made of permanent magnetic ferrite material is described in the article in "Funkschau" (1976), No. 5 , Pages 59 and 60.

Die der Erfindung zugrunde liegende Aufgabe besteht deshalb darin, eine Magnetisiervorrichtung zum Magnetisieren der statischen Konvergenzeinrichtung zu schaffen, welche möglichst kompakt aufgebaut und nahe der Konvergenzeinrichtung anzuordnen ist und welche in der Weise auf die Konvergenzeinrichtung einwirkt, daß diese eine jeweils nur einen Elektronenstrahl - unabhängig von den anderen Elektronenstrahlen - beeinflussende Magnetisierung erfährt. Diese Magnetisierung soll außerdem einen möglichst geringen Einfluß auf die Form der Elektronenstrahlen haben.The object on which the invention is based is therefore to create a magnetizing device for magnetizing the static convergence device, which is to be as compact as possible and is to be arranged close to the convergence device and which acts on the convergence device in such a way that the convergence device in each case only one electron beam - independently of the other electron beams - experiences magnetizing influences. This magnetization should also have the least possible influence on the shape of the electron beams.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst,

  • - daß die permanent magnetische Konvergenzeinrichtung aus einem in der Konvergenzebene angeordneten Drahtring besteht,
  • - daß die Spulen um den Hals der Farbbildröhre herum so angeordnet sind, daß ihre magnetischen Achsen in der Konvergenzebene liegen,
  • - daß der Querschnitt jeder Spule senkrecht zur Konvergenzebene eine kleine Abmessung und in Richtung der Konvergenzebene eine große Abmessung aufweist.
According to the invention, this object is achieved by
  • that the permanent magnetic convergence device consists of a wire ring arranged in the convergence plane,
  • that the coils are arranged around the neck of the color picture tube so that their magnetic axes lie in the plane of convergence,
  • - That the cross section of each coil has a small dimension perpendicular to the convergence plane and a large dimension in the direction of the convergence plane.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 8 enthalten.Advantageous embodiments of the invention are contained in claims 2 to 8.

Da die Magnetspulen ungleiche Abmessungen besitzen, sind sie an die Form der Konvergenzeinrichtung angepaßt. Da alle Spulenabmessungen in der Ebene der Konvergenzeinrichtung liegen, ist eine möglichst geringe Strahlformveränderung gewährleistet. Durch die Anpassung der Spulenform an die Form der Konvergenzeinrichtung ist es möglich, sehr starke Magnetisierfelder zu erzielen. Dies gestattet den Aufbau von Magnetsiervorrichtungen, bei denen die Spulen, die zur Erzielung eines Mehrpolfeldes erforderlich sind, auf Kreisen mit unterschiedlichen Radien um den Röhrenhals angeordnet werden können. Es hat sich herausgestellt, daß mit einer solchen Vorrichtung sogar durch ein um den Röhrenhals herum angeordnetes Ablenksystem hindurch magnetisiert werden kann. Neuartige Ablenksysteme erstrecken sich nämlich über einen so langen Bereich des Farbbildröhrenhalses, daß sie noch einen Teil des Elektronenstrahlerzeugungssystems überdekken. Es war daher bisher notwendig, die Konvergenz- und Farbreinheitseinstellung vorzunehmen, bevor das Ablenksystem an der Röhre befestigt wird. Die Felder der erfindungsgemäßen Magnetisiervorrichtung sind jedoch so stark, daß sogar durch das schon aufgesetzte Ablenksystem hindurch das im Röhrenhals angebrachte hartmagnetische Material auf- oder ummagnetisiert werden kann.Since the magnetic coils have different dimensions, they are adapted to the shape of the convergence device. Since all coil dimensions lie in the plane of the convergence device, the smallest possible change in beam shape is guaranteed. By adapting the coil shape to the shape of the convergence device, it is possible to achieve very strong magnetizing fields. This allows the construction of magnetizing devices in which the coils, which are required to achieve a multi-pole field, can be arranged on circles with different radii around the tube neck. It has been found that such a device can even magnetize through a deflection system arranged around the tube neck. Novel deflection systems in fact extend over such a long area of the color picture tube neck that they still cover part of the electron gun. It was previously necessary to adjust the convergence and color purity before the deflection system was attached to the tube. The fields of the magnetizing device according to the invention are so strong, however, that the hard magnetic material attached to the tube neck can be magnetized or re-magnetized even through the deflection system already attached.

Die Erfindung ist nachstehend anhand von vier Figuren näher erläutert. Es zeigt

  • Fig. 1 die Spulenform im Vergleich zur Form der Konvergenzeinrichtung,
  • Fig. eine Ausführungsform der erfindungsgemäßen Magnetisiervorrichtung mit radial um den Röhrenhals angeordneten Magnetspulen,
  • Fig. 3 eine weitere Ausführungsform der erfindungsgemäßen Magnetisiervorrichtung, und
  • Fig. 4 die Draufsicht auf einen Spulenwickelkörper, der Bestandteil der Vorrichtung gemäß Fig. 3 ist.
The invention is explained below with reference to four figures. It shows
  • 1 shows the coil shape in comparison to the shape of the convergence device,
  • 1 shows an embodiment of the magnetizing device according to the invention with magnet coils arranged radially around the tube neck,
  • 3 shows a further embodiment of the magnetizing device according to the invention, and
  • Fig. 4 is a plan view of a coil bobbin, which is part of the device of FIG. 3.

In Fig. 1 ist die Konvergenzeinrichtung aus hartmagnetischem Werkstoff zu erkennen, welche aus einem im Inneren des Farbbildröhrenhalses angeordneten Drahtring 1 mit Luftspalt besteht. Dieser Ring ist konzentrisch zum mittleren Elektronenstrahl 5 angeordnet. Die Elektronenstrahlrichtung ist mit z bezeichnet. Der Ring befindet sich in der Konvergenzeinrichtungsebene, welche senkrecht zur z-Achse steht. Anstelle der Gestalt eines Ringes kann die Konvergenzeinrichtung auch eine andere Gestalt aufweisen.1 shows the convergence device made of hard magnetic material, which consists of a wire ring 1 with an air gap arranged in the interior of the color picture tube neck. This ring is arranged concentrically with the central electron beam 5. The electron beam direction is designated z. The ring is located in the convergence plane, which is perpendicular to the z-axis. Instead of the shape of a ring, the convergence device can also have a different shape.

Fig. 1 zeigt den Drahtring 1 in Blickrichtung der Konvergenzeinrichtungsebene, so daß der Drahtring 1 nur als Strich erscheint. Vor dem Drahtring ist die rechteckige elektrisch erregbare Magnetspule 2 zu erkennen, deren magnetische Achse in Blickrichtung liegt. Die längere Abmessung der Spule 2 liegt parallel zur Konvergenzeinrichtungsebene. Es ist erkennbar, daß die Spulenform gut an die Form der Konvergenzeinrichtung angepaßt ist.Fig. 1 shows the wire ring 1 in the direction of view of the convergence device level, so that the wire ring 1 appears only as a line. In front of the wire ring, the rectangular, electrically excitable magnet coil 2 can be seen, the magnetic axis of which lies in the viewing direction. The longer dimension of the coil 2 is parallel to the convergence device level. It can be seen that the coil shape is well adapted to the shape of the converging device.

Im Vergleich zur rechteckigen Spule 2 ist gestrichelt der Durchmesser einer runden Spule 3 eingezeichnet, welche dieselbe Fläche umschließt wie die rechteckige Spule. Anhand von Fig. 1 ist leicht vorstellbar, daß die rechteckige Spule auf der gesamten Ausdehnung der Konvergenzeinrichtung ein homogenes Feld erzeugt. Bei der runden Spule dagegen würden sich Randbereiche der Konvergenzeinrichtung im inhomogenen Randfeld der Spule befinden. Um mit einer runden Spule ebenfalls ein homogenes Feld auf der gesamten Ausdehnung der Konvergenzeinrichtung zu gewährleisten, müßte der Durchmesser der runden Spule 3 größer sein. Dadurch wäre aber bei gleichem Stromfluß in der Spule nur ein erheblich schwächeres Feld erzielbar. Der maximale Stromfluß ist jedoch durch die zur Verfügung stehenden Spannungsquellen begrenzt. Wegen der besseren Anpassung der Spulenform bei der erfindungsgemäßen Vorrichtung an die Form der Konvergenzeinrichtung ist daher mit dieser bei einer bestimmten Spannungsquelle eine erheblich höhere Feldstärke erzielbar. Wesentlich ist jedoch, daß sich alle zu magnetisierenden Teile der Konvergenzeinrichtung in einer senkrecht auf der Strahlachse bestehenden Ebene befinden.In comparison to the rectangular coil 2, the diameter of a round coil 3, which encloses the same area as the rectangular coil, is shown in broken lines. Based on Fig. 1 is easy to imagine that the rectangular coil generates a homogeneous field over the entire extent of the convergence device. In contrast, in the case of the round coil, edge regions of the convergence device would be located in the inhomogeneous edge field of the coil. In order to also ensure a homogeneous field over the entire extent of the convergence device with a round coil, the diameter of the round coil 3 would have to be larger. This would, however, only achieve a considerably weaker field with the same current flow in the coil. The maximum current flow is limited by the available voltage sources. Because of the better adaptation of the coil shape in the device according to the invention to the shape of the convergence device, it is therefore possible to achieve a considerably higher field strength with this at a certain voltage source. It is essential, however, that all parts of the convergence device to be magnetized are located in a plane that is perpendicular to the beam axis.

Nachstehend wird zunächst die Wirkungsweise einer Magnetisiereinrichtung gemäß Fig.2 2 beschrieben, worauf Angaben der geometrischen Abmessungen und der elektrischen Eigenschaften der Spulen folgen.The mode of operation of a magnetizing device according to FIG. 2 is first described below, followed by information on the geometric dimensions and the electrical properties of the coils.

Um den Hals 6 der Farbbildröhre sind auf einem ersten Kreis sechs Spulen mit radialen, jeweils unter 60° zueinander stehenden magnetischen Achsen angeordnet. Zwei der magnetischen Achsen befinden sich auf der x-Achse. Diese Spulen werden so betrieben, daß sie ein Sechs-Pol-Feld in den Drahtring 1 einprägen, durch welches die beiden äußeren Elektronenstrahlen 4 gemeinsam gegenüber dem mittleren Elektronenstrahl 5 in y-Richtung verschiebbar sind. Auf einem zweiten Radius sind sechs weitere Spulen 8 angeordnet, die ebenfalls um 60° gegeneinander versetzt sind. Zwei der sechs Spulen befinden sich auf der y-Achse. Diese sechs Spulen werden so betrieben, daß sie ein Sechs-Pol-Feld in den Drahtring 1 einprägen, durch welches die beiden äußeren Elektronenstrahlen gemeinsam gegenüber dem mittleren Elektronenstrahl in x-Richtung verschiebbar sind. Auf einem dritten, noch größeren Radius sind acht weitere Spulen angeordnet, deren radial angeordnete magnetischen Achsen jeweils Winkel von 45° einschließen. Die vier Spulen, deren magnetische Achsen mit der x- bzw. y-Achse zusammenfallen, sind mit 9 bezeichnet. Diejenigen vier Spulen, deren magnetische Achsen jeweils 45° gegen die x- und y-Achse versetzt sind, sind mit 10 bezeichnet. Die vier Spulen 9 werden so betrieben, daß ein Vier-Pol-Feld in den Drahtring 1 eingeprägt wird, mit dem die beiden äußeren Strahlen 4 gegeneinander in y-Richtung verschiebbar sind, wobei jedoch der mittlere Elektronenstrahl 5 unbeeinflußt bleibt. Die vier Spulen 10 werden dagegen so betrieben, daß ein Vier-Pol-Feld in den Drahtring 1 eingeprägt wird, durch das die beiden äußeren Elektronenstrahlen 4 gegeneinander in x-Richtung verschoben werden, wobei jedoch der mittlere Elektronenstrahl 5 ebenfalls unbeeinflußt bleibt. Die Spulen für die Vier-Pol-Felder können auch auf zwei Kreisradien analog den Sechs-Pol-Spulen angeordnet sein.Around the neck 6 of the color picture tube, six coils with radial magnetic axes, each at 60 ° to one another, are arranged on a first circle. Two of the magnetic axes are on the x axis. These coils are operated in such a way that they impress a six-pole field into the wire ring 1, through which the two outer electron beams 4 can be displaced together in the y direction with respect to the central electron beam 5. Six further coils 8 are arranged on a second radius, which are likewise offset from one another by 60 °. Two of the six coils are on the y-axis. These six coils are operated in such a way that they impress a six-pole field into the wire ring 1, through which the two outer electron beams can be displaced in the x direction together with respect to the central electron beam. On a third, even larger radius, eight further coils are arranged, the radially arranged magnetic axes of which each enclose angles of 45 °. The four coils, the magnetic axes of which coincide with the x and y axes, are designated by 9. Those four coils, the magnetic axes of which are each offset by 45 ° with respect to the x and y axes, are designated by 10. The four coils 9 are operated in such a way that a four-pole field is impressed into the wire ring 1, with which the two outer beams 4 can be displaced relative to one another in the y direction, but the central electron beam 5 remains unaffected. The four coils 10, on the other hand, are operated in such a way that a four-pole field is impressed into the wire ring 1, by means of which the two outer electron beams 4 are displaced relative to one another in the x direction, but the central electron beam 5 also remains unaffected. The coils for the four-pole fields can also be arranged on two circular radii analogous to the six-pole coils.

Alle bisher erwähnten, der Einstellung der statischen Konvergenz dienenden Spulen sind auf Kreisen mit unterschiedlichen Radien angeordnet. Zur Einstellung der Farbreinheit sind jedoch langgestreckte Spulen erforderlich, die am Ort aller drei Elektronenstrahlen ein gleiches, homogenes Feld erzeugen. Die magnetischen Achsen der Farbreinheitsspulen fallen mit der y-Achse zusammen. Die zwei, in y-Richtung über und unter den bisher beschriebenen Spulen angeordneten Farbreinheitsspulen 11 werden so betrieben, daß ein Zwei-Pol-Feld entsteht, welches alle drei Elektronenstrahlen gemeinsam um gleiche Beträge in x-Richtung verschiebt. Entsprechend der gemeinsamen Verschiebung aller drei Elektronenstrahlen in x-Richtung ist zur Rastereinstellung die Möglichkeit einer gemeinsamen Vorablenkung aller drei Elektronenstrahlen in y-Richtung erwünscht. Zu diesem Zweck sind bei der Vorrichtung gemäß Fig. 2 noch zwei zusätzliche Rasterkorrekturspulen 12 vorgesehen, deren magnetische Achsen mit der x-Achse zusammenfallen, und die sich in x-Richtung links und rechts neben den Konvergenzspulen befinden. Die Spulen 12 werden ebenfalls so betrieben, daß ein Zwei-Pol-Feld entsteht.All of the previously mentioned coils used to adjust the static convergence are arranged on circles with different radii. To adjust the color purity, however, elongated coils are required, which generate an identical, homogeneous field at the location of all three electron beams. The magnetic axes of the color purity coils coincide with the y axis. The two color purity coils 11 arranged in the y-direction above and below the coils described so far are operated in such a way that a two-pole field is created which shifts all three electron beams together by the same amount in the x-direction. Corresponding to the joint displacement of all three electron beams in the x direction, the possibility of a common deflection of all three electron beams in the y direction is desired for the raster adjustment. For this purpose, two additional raster correction coils 12 are provided in the device according to FIG. 2, the magnetic axes of which coincide with the x-axis and which are located to the left and right of the convergence coils in the x-direction. The coils 12 are also operated so that a two-pole field is created.

Alle Spulen haben eine rechteckige Gestalt. Die großen Abmessungen der Farbreinheitsspulen 11 und der Rasterkorrekturspulen 12 sind etwa doppelt bis dreimal so lang wie der Durchmesser der Einrichtung zur Einstellung der statischen Konvergenz in x- oder y-Richtung. Die großen Abmessungen der auf Kreisen angeordneten Spulen sind jeweils so groß, daß alle auf dem Kreis befindlichen Spulen einen geschlossenen Kreis bilden. Die kleine Abmessung aller Spulen beträgt etwa 1 cm. Die Farbreinheits- und Rasterkorrekturspulen bestehen aus jeweils 95Windungen eines Kupferdrahtes mit dem Querschnitt von 0,5 mm2. Die anderen Spulen bestehen aus jeweils 150 Windungen eines Kupferdrahtes mit dem Querschnitt von 0,25 mm2. Die für die Grundvorablenkungsbewegung vorgesehenen Spulen 12 werden jeweils in Serie geschaltet und über einen Kondensator von ca. 200 µF mit maximal ± 500 V erregt. Die erzielbaren Vorablenkungen führen zu Verschiebungen der Elektronenstrahlenlandungspunkte von bis zu ± 15 mm auf dem Bildschirm der Farbbildröhre.All coils have a rectangular shape. The large dimensions of the color purity coils 11 and the raster correction coils 12 are approximately twice to three times as long as the diameter of the device for setting the static convergence in the x or y direction. The large dimensions of the coils arranged on circles are each so large that all the coils on the circle form a closed circle. The small dimension of all coils is about 1 cm. The color purity and halftone correction coils each consist of 95 turns of a copper wire with a cross section of 0.5 mm 2. The other coils consist of 150 turns of a copper wire with a cross section of 0.25 mm 2 . The coils 12 provided for the basic deflection movement are each connected in series and excited with a capacitor of approximately 200 μF with a maximum of ± 500 V. The achievable deflections lead to displacements of the electron beam landing points of up to ± 15 mm on the screen of the color picture tube.

Die beschriebene Magnetisiervorrichtung ermöglicht es, die beiden äußeren Elektronenstrahlen gemeinsam gegeneinander oder miteinander, ohne Beeinflussung des mittleren Elektronenstrahls, abzulenken. Das Einprägen der Magnetisierung in den Werkstoff der auf- und unmagnetisierbaren Konvergenzeinrichtung erfolgt in an sich bekannter Weise, so daß darauf hier nicht näher eingegangen wird.The magnetizing device described makes it possible to deflect the two outer electron beams together or against one another without influencing the central electron beam. The magnetization is impressed into the material of the convergent device which can be magnetized and unmagnetized in a manner known per se, so that it is not dealt with in more detail here.

Fig. 3 zeigt eine weitere Ausführungsform der erfindungsgemäßen Magnetisiervorrichtung, mit der jeweils ein äußerer Elektronenstrahl 4 im wesentlichen unabhängig vom mittleren und dem anderen äußeren Elektronenstrahl eingestellt werden kann. Als Konvergenzeinrichtung soll wieder ein permanentmagnetischer Drahtring 3 im Röhrenhals 6 vorgesehen sein. Die Abmessungen der in Fig. 3 dargestellten Vorrichtung entsprechen einer Magnetisiervorrichtung, welche zum Magnetisieren eines im Innern einer sogenannten Dickhalsröhre mit ca. 36 mm Halsau- ßendurchmesser angeordneten permanentmagnetischen Drahtringes vorgesehen ist. Aufbau und Wirkungsweise der Farbreinheitskorrekturspulen 11 und Rasterkorrekturspulen 12 entsprechen den in Fig. 2 beschriebenen. In Fig. 3 sind jedoch nur rechts und oben die bewickelten Magnetspulen 12 und 13 eingezeichnet, während unten und links lediglich die unbewickelten Wikkelkörper erkennbar sind.Fig. 3 shows a further embodiment of the Magnetizing device according to the invention, with each of which an outer electron beam 4 can be adjusted substantially independently of the middle and the other outer electron beam. A permanent magnetic wire ring 3 is again to be provided in the tube neck 6 as a convergence device. The dimensions of the device shown in FIG. 3 correspond to a magnetizing device which is provided for magnetizing a permanent-magnetic wire ring arranged inside a so-called thick-necked tube with an outside diameter of approximately 36 mm. The structure and mode of operation of the color purity correction coils 11 and raster correction coils 12 correspond to those described in FIG. 2. In Fig. 3, however, the wound magnetic coils 12 and 13 are shown only on the right and above, while only the unwound winding body can be seen below and left.

Nachstehend soll zunächst die Verschiebung des rechten Elektronenstrahls 4 in x-Richtung beschrieben werden. Die Spulen 13, deren magnetische Achsen parallel zur x-Achse oder in einem Winkel zu dieser geneigt verlaufen, sind in y-Richtung übereinander, jedoch in gleichen Abständen oberhalb und unterhalb der x-Achse angeordnet. Sie werden so betrieben, daß die Polung der einen Spule genau entgegengesetzt zur Polung der anderen Spule ist. Es wird auf diese Weise ein in Fig. 3 gestrichelt gezeichnetes Magnetfeld in beiden Spulen erzeugt, dessen Feldlinien über den Drahtring 1 geschlossen sind. Die Feldlinien am Ort des rechten äußeren Elektronenstrahls 4 verlaufen im wesentlichen in y-Richtung, welches eine Verschiebung dieses Elektronenstrahls in x-Richtung bewirkt. Da die Feldstärke quadratisch zur Entfernung von den Spulen abfällt, werden die mittlere und der andere äußere Elektronenstrahl kaum beeinflußt. Die Verschiebung des äußeren Elektronenstrahles in y-Richtung ist anhand des linken äußeren Elektronenstrahles 4 in Fig. dargestellt. Die Spule 14, deren magnetische Achse mit der x-Achse zusammenfällt, wird in der Weise erregt, daß die Spule den eingezeichneten magnetischen Nord- und Südpol bildet. Die Feldlinien schließen sich in bekannter Weise außerhalb der Spule. Dadurch befindet sich der linke äußere Elektronenstrahl 4 in einem in x-Richtung verlaufenden, gestrichelt gezeichneten Magnetfeld, welches eine Ablenkung in y-Richtung bewirkt. Die Spulenanordnungen zur Ablenkung eines äußeren Elektronenstrahles in x- oder in y-Richtung wurden zwar nur für eine Seite der Magnetisiervorrichtung erläutert. Da bei der Magnetisiervorrichtung beide Spulen 13 und 14 auf jeder Seite vorhanden sind, können beide äußeren Elektronenstrahlen 4 im wesentlichen unabhängig voneinander und unabhängig vom mittleren Elektronenstrahl 5 einzeln in x- oder in y-Richtung abgelenkt werden.The shift of the right electron beam 4 in the x direction will first be described below. The coils 13, the magnetic axes of which run parallel to the x axis or inclined at an angle thereto, are arranged one above the other in the y direction, but at equal intervals above and below the x axis. They are operated so that the polarity of one coil is exactly opposite to the polarity of the other coil. In this way, a magnetic field drawn in broken lines in FIG. 3 is generated in both coils, the field lines of which are closed via the wire ring 1. The field lines at the location of the right outer electron beam 4 run essentially in the y direction, which causes this electron beam to be displaced in the x direction. Since the field strength decreases quadratically with the distance from the coils, the middle and the other outer electron beam are hardly influenced. The displacement of the outer electron beam in the y direction is shown in FIG. 1 using the left outer electron beam 4. The coil 14, the magnetic axis of which coincides with the x-axis, is excited in such a way that the coil forms the magnetic north and south poles shown. The field lines close in a known manner outside the coil. As a result, the left outer electron beam 4 is located in a dashed magnetic field in the x direction, which causes a deflection in the y direction. The coil arrangements for deflecting an external electron beam in the x or y direction were only explained for one side of the magnetizing device. Since both coils 13 and 14 are present on each side in the magnetizing device, both outer electron beams 4 can be deflected independently of one another and independently of the central electron beam 5 individually in the x or y direction.

Fig. 4 zeigt die Seitenansicht des Wickelkörpers, auf den bei der Vorrichtung gemäß Fig. 3 die Spulen für Rasterkorrektur 12 und für die unabhängige Ablenkung eines äußeren Elektronenstrahls in x- und y-Richtung 13, 14 gewickelt sind. Der Abstand des Wickelkörpers bzw. der darauf gewickelten Spule vom Röhrenhals 6 und von der Konvergenzeinrichtung 1 ist aus Fig. 4 ersichtlich. Die elektrische Ausführung der Spule 12 entspricht der in Fig. 2 beschriebenen.FIG. 4 shows the side view of the winding body on which the coils for raster correction 12 and for the independent deflection of an external electron beam in the x and y directions 13, 14 are wound in the device according to FIG. 3. The distance of the winding body or the coil wound thereon from the tube neck 6 and from the convergence device 1 can be seen from FIG. 4. The electrical design of the coil 12 corresponds to that described in FIG. 2.

Die dargestellten und beschriebenen Ausführungsformen der erfindungsgemäßen Magnetisiervorrichtung sind zum Magnetisieren einer im Inneren des Röhrenhalses angeordneten Konvergenzeinrichtung geeignet. Die gleiche Vorrichtung, jedoch mit größeren geometrischen Abmessungen, kann zum Magnetisieren einer außen auf dem Röhrenhals angeordneten Konvergenzeinrichtung verwendet werden oder aber wenn zwar die Konvergenzeinrichtung im Innern des Röhrenhalses angeordnet ist, sich jedoch zwischen Röhrenhals und Magnetisiervorrichtung noch Teile eines Ablenksystems befinden. Es ist ein besonderer Vorteil der erfindungsgemäßen Magnetisiervorrichtungen, daß auch noch durch Teile des Ablenksystemes hindurch im Innern des Röhrenhalses angeordnete permanentmagnetische Werkstoffe magnetisiert werden können.The illustrated and described embodiments of the magnetizing device according to the invention are suitable for magnetizing a convergence device arranged inside the tube neck. The same device, but with larger geometrical dimensions, can be used to magnetize a convergence device arranged on the outside of the tube neck or if the convergence device is arranged inside the tube neck, but parts of a deflection system are still located between the tube neck and the magnetizing device. It is a particular advantage of the magnetizing devices according to the invention that permanent magnetic materials arranged in the interior of the tube neck can also be magnetized through parts of the deflection system.

Claims (8)

1. Apparatus for magnetizing the permanent- magnet convergence device of an in-line colour-picture tube, wherein a permanent magnet located in a convergence-device plane perpendicular to the colour-picture tube's longitudinal axis running in direction »z« is magnetizable and remag- netizable by means of coils mounted around the neck of the tube and generating an electro-magnetic field in the direction of the convergence-device plane, characterized in
- that the permanent-magnet convergence device consists of a wire ring (1) arranged in the convergence plane,
- that the coils (7, 8, 9, 10, 11, 12, 13, 14) are arranged around the neck of the colour-picture tube in such a way that their magnetic axes lie in the convergence plane,
- that the cross-section of each coil has a small dimension perpendicularly to the convergence plane and large dimension in the direction of the convergence plane.
2. Apparatus in accordance with claim 1, characterized in that the coils (7, 8, 9, 10) are rectangular.
3. Apparatus in accordance with claim 1 or 2, characterized in that six identical coils (7) arranged at equal intervals circularly round the neck (6) of the colour-picture tube are provided, two of which coils are arranged on the horizontal (x) axis through the neck.
4. Apparatus in accordance with any one of claims 1 to 3, characterized in that six identical coils (8) arranged at equal intervals circularly round the neck (6) of the colour-picture tube are provided, two of which coils are arranged on the vertical (y) axis through the neck.
5. Apparatus in accordance with one of claims 1 to 4, characterized in that four identical coils (9) arranged at equal intervals circularly round the neck (6) of the colour-picture tube are provided, two of which coils are arranged on the vertical (y) axis and two on the horizontal (x) axis through the neck.
6. Apparatus in accordance with any one of claims 1 to 5, characterized in that four identical coils (10) arranged at equal intervals circularly round the neck (6) of the colour-picture tube are provided, which coils are each offset by an angle of 45° in relation to the coils (9).
7. Apparatus in accordance with claim 1 or 2, characterized in that one coil (14) is arranged on either side of the neck (6), with their magnetic axis on the horizontal (x) axis.
8. Apparatus according to claim 1 or 2, characterized in that two coils (13) whose magnetic axes point in the direction of the horizontal (x) axis or are inclined at a small angle to it are situated on each side of the neck closely spaced above each other.
EP80107753A 1979-12-12 1980-12-09 Magnetizing device for the convergence assembly of in-line colour picture tubes Expired EP0030704B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2949851A DE2949851C2 (en) 1979-12-12 1979-12-12 Device for magnetizing a convergence device for inline color picture tubes
DE2949851 1979-12-12

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EP0030704A2 EP0030704A2 (en) 1981-06-24
EP0030704A3 EP0030704A3 (en) 1982-03-03
EP0030704B1 true EP0030704B1 (en) 1985-03-27

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US (1) US4395692A (en)
EP (1) EP0030704B1 (en)
JP (1) JPS6057652B2 (en)
CA (1) CA1169116A (en)
DE (1) DE2949851C2 (en)
FI (1) FI70096C (en)

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DE3271630D1 (en) * 1982-03-31 1986-07-17 Ibm Convergence unit for in-line colour cathode ray tube
JPS6222351A (en) * 1985-07-19 1987-01-30 Mitsubishi Electric Corp Auxiliary adjusting device for convergence

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DE2832667A1 (en) * 1977-07-26 1979-02-08 Rca Corp METHOD FOR PRODUCING MAGNETIZED AREAS

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NL170683C (en) * 1975-04-01 1982-12-01 Philips Nv METHOD FOR MANUFACTURING A STATIC CONVERGENCE UNIT AND A COLOR IMAGE TUBE INCLUDING A CONVERGENCE UNIT, MANUFACTURED USING THAT METHOD
DE2612607C3 (en) * 1976-03-25 1984-01-12 Philips Patentverwaltung Gmbh, 2000 Hamburg Static convergence correction device in color television picture display tubes
DE2722477A1 (en) * 1977-05-18 1978-11-23 Standard Elektrik Lorenz Ag COLOR TELEVISION SCREENS
NL7707476A (en) * 1977-07-06 1979-01-09 Philips Nv PROCEDURE FOR MANUFACTURING A COLOR IMAGE TUBE AND COLOR IMAGE TUBE MADE IN ACCORDANCE WITH THAT PROCESS.
US4159456A (en) * 1977-07-26 1979-06-26 Rca Corporation Magnetizing apparatus and method for use in correcting color purity in a cathode ray tube and product thereof
US4162470A (en) * 1977-07-26 1979-07-24 Rca Corporation Magnetizing apparatus and method for producing a statically converged cathode ray tube and product thereof
SU741349A1 (en) * 1978-11-21 1980-06-15 Львовский Ордена Ленина Политехнический Институт Magnetic deflection system
DE2907898A1 (en) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing MULTIPOLE DEVICE AND METHOD FOR MAGNETIZING RING-SHAPED PERMANENT MAGNETS

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DE2832667A1 (en) * 1977-07-26 1979-02-08 Rca Corp METHOD FOR PRODUCING MAGNETIZED AREAS

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JPS6057652B2 (en) 1985-12-16
DE2949851C2 (en) 1982-09-09
FI70096B (en) 1986-01-31
EP0030704A2 (en) 1981-06-24
CA1169116A (en) 1984-06-12
EP0030704A3 (en) 1982-03-03
FI803861L (en) 1981-06-13
US4395692A (en) 1983-07-26
DE2949851A1 (en) 1981-06-19
JPS5693245A (en) 1981-07-28

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