EP0180205B1 - Deflection system for colour picture tubes - Google Patents

Deflection system for colour picture tubes Download PDF

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Publication number
EP0180205B1
EP0180205B1 EP85113770A EP85113770A EP0180205B1 EP 0180205 B1 EP0180205 B1 EP 0180205B1 EP 85113770 A EP85113770 A EP 85113770A EP 85113770 A EP85113770 A EP 85113770A EP 0180205 B1 EP0180205 B1 EP 0180205B1
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EP
European Patent Office
Prior art keywords
field
deflection
deflection system
formers
field formers
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
EP85113770A
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German (de)
French (fr)
Other versions
EP0180205A1 (en
Inventor
Wilfried Dr. Bernhard
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.)
Panasonic Holdings Corp
Original Assignee
Standard Elektrik Lorenz AG
Nokia Graetz 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 Standard Elektrik Lorenz AG, Nokia Graetz GmbH filed Critical Standard Elektrik Lorenz AG
Publication of EP0180205A1 publication Critical patent/EP0180205A1/en
Application granted granted Critical
Publication of EP0180205B1 publication Critical patent/EP0180205B1/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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only

Definitions

  • the invention relates to a deflection system for color picture tubes according to the preamble of claim 1.
  • Such a deflection system is known from DE-PS-2 851 014, in which the field formers for forming the vertical deflection field consist of four arms.
  • the arms are arranged corresponding to the four corners of the screen of the color picture tube in the front region of the deflection system outside the deflection windings and extend substantially parallel to the z-axis of the color picture tube.
  • the arms protrude half over the deflection system and half over this in the direction of the screen of the color picture tube and should guide the stray fluxes generated by the vertical deflection such that the vertical deflection field is deformed like a pillow.
  • the invention has for its object to provide a self-convergent and distortion-free deflection system for color picture tubes.
  • Fig. 1 only part of the cone 1 and the neck 2 is shown of a color picture tube.
  • the inline electron gun system 3 is schematically indicated in the neck 2.
  • the deflection system 4 is pushed onto the neck 2 of the color picture tube and z. B. connected by adjustable fasteners 5 with the cone 1 of the color picture tube.
  • the x-axis denotes the horizontal and the y-axis the vertical of the color picture tube.
  • the z-axis is the longitudinal axis of the deflection system or the color picture tube. In Fig. 1, the x-axis is perpendicular to the plane of the drawing.
  • the deflection system 4 has a deflection winding for the horizontal deflection field within a coil former 6.
  • the deflection winding 7 for the vertical deflection field is arranged on the coil former 6.
  • the deflection winding 7 consists of two winding halves 7a and 7b, both of which are wound on a core 8.
  • the core 8 is a conical toroid. In front of the end face 14 of the core 8 there are two field formers 9, only one of which is visible.
  • These flat, thin field formers 9 made of soft magnetic material both lie in the same plane spanned by the x and y axes and perpendicular to the z axis.
  • the field formers 9 When viewed in the direction of the z-axis, the field formers 9 are approximately half covered by the end face 14 of the core 8.
  • the field formers 9 are arranged mirror-symmetrically to the x and y axes, so that their centers lie on the x axis.
  • the field former shown has essentially the shape of a ring segment and the segment angle is 120 °.
  • the width of the ring segment is approximately 15 mm.
  • the position of the field former 9 in relation to the coordinate system is shown as it is arranged on the end face 14 of the core 8 in the deflection system 4. This means that the bisector of the segment angle coincides with the x-axis.
  • the core 8 is shown for the sake of clarity without the deflection winding for the vertical deflection field.
  • FIG. 3 shows the top view of a further exemplary embodiment of the field former 9.
  • the outer contour of this field former is polygonal.
  • the first pair of corners 11 is ⁇ 18 ° and the second pair of corners 12 is approximately ⁇ 45 ° from the x-axis.
  • the connecting line from corner 11 to corner 12 includes an angle of approximately 26 ° with a line perpendicular to the x-axis.
  • the field formers 9 can also have a polygonal shape on their inner contour. It is also possible to make the outer and inner contours polygonal.
  • the field shapers 9 In order to weaken the effect of the field shapers, it is also possible to cut a segment out of the field shapers 9 symmetrically to the x-axis.
  • the resulting four field formers take up the same space in the deflection system 4 as the two field formers described in FIG. 1. With four field formers, it can also be arranged in pairs in different x-y planes.
  • the deflection field generated by the vertical deflection winding is an inhomogeneous field, which is deformed in the shape of a cushion in the front part and in the rear part of the deflection system in a barrel shape.
  • This inhomogeneous field can be described by the superposition of a dipole with a sextupole and with multipoles of higher order.
  • the field formers 9 reinforce the sextupole and the multipole of higher order so that there is a strong pillow-shaped field in the front part of the deflection system. This ensures that there are no pincushion distortions in the x direction (east / west direction) on the screen of the color picture tube.
  • the corners 11, 12 in the outer and in the inner contour of the field formers in particular, reinforce the multipoles of higher order.

Description

Die Erfindung bezieht sich auf ein Ablenksystem für Farbbildröhren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a deflection system for color picture tubes according to the preamble of claim 1.

Aus der DE-PS-2 851 014 ist ein derartiges Ablenksystem bekannt, bei dem die Feldformer zur Formung des vertikalen Ablenkfeldes aus vier Armen bestehen. Die Arme sind entsprechend den vier Ecken des Schirmes der Farbbildröhre im vorderen Bereich des Ablenksystems außerhalb der Ablenkwicklungen angegeordnet und erstrecken sich im wesentlichen parallel zur z-Achse der Farbbildröhre. Dabei ragen die Arme halb über das Ablenksystem und halb über dieses in Richtung des Schirmes der Farbbildröhre hinaus und sollen die von der Vertikalablenkwicklung erzeugten Streuflüsse derart leiten, daß das vertikale Ablenkfeld kissenförmig deformiert wird.Such a deflection system is known from DE-PS-2 851 014, in which the field formers for forming the vertical deflection field consist of four arms. The arms are arranged corresponding to the four corners of the screen of the color picture tube in the front region of the deflection system outside the deflection windings and extend substantially parallel to the z-axis of the color picture tube. The arms protrude half over the deflection system and half over this in the direction of the screen of the color picture tube and should guide the stray fluxes generated by the vertical deflection such that the vertical deflection field is deformed like a pillow.

Der Erfindung liegt die Aufgabe zugrunde, ein selbstkonvergentes und verzeichnungsfreies Ablenksystem für Farbbildröhren anzugeben.The invention has for its object to provide a self-convergent and distortion-free deflection system for color picture tubes.

Die Lösung dieser Aufgabe erfolgt mit den im Anspruch 1 angegebenen Mitteln. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen 2 bis 8 enthalten.This object is achieved with the means specified in claim 1. Advantageous embodiments of the invention are contained in the dependent claims 2 to 8.

Die Erfindung wird nun anhand von in den Figuren gezeigten Ausführungsbeispielen näher erläutert. Es zeigen:

  • Fig. 1 eine Seitenansicht eines Ablenksystems auf dem Hals einer Farbbildröhre;
  • Fig. 2 eine Draufsicht auf eine erste Form der Feldformer und
  • Fig. 3 die Draufsicht auf eine zweite Ausführungsform der Feldformer.
The invention will now be explained in more detail with reference to exemplary embodiments shown in the figures. Show it:
  • Figure 1 is a side view of a deflection system on the neck of a color picture tube.
  • Fig. 2 is a plan view of a first form of the field former and
  • Fig. 3 is a plan view of a second embodiment of the field former.

In Fig. 1 ist von einer Farbbildröhre nur ein Teil des Konus 1 und der Hals 2 dargestellt. Im Hals 2 ist schematisch das Inline-Elektronenstrahlerzeugersystem 3 angedeutet. Auf den Hals 2 der Farbbildröhre ist das Ablenksystem 4 aufgeschoben und z. B. durch einstellbare Befestigungselemente 5 mit dem Konus 1 der Farbbildröhre verbunden.In Fig. 1 only part of the cone 1 and the neck 2 is shown of a color picture tube. The inline electron gun system 3 is schematically indicated in the neck 2. The deflection system 4 is pushed onto the neck 2 of the color picture tube and z. B. connected by adjustable fasteners 5 with the cone 1 of the color picture tube.

Bei dem eingezeichneten Koordinatensystem bezeichnet die x-Achse die Horizontale und die y-Achse die Vertikale der Farbbildröhre. Die z-Achse ist die Längsachse des Ablenksystems bzw. der Farbbildröhre. In Fig. 1 steht die x-Achse senkrecht auf der Zeichenebene.In the coordinate system shown, the x-axis denotes the horizontal and the y-axis the vertical of the color picture tube. The z-axis is the longitudinal axis of the deflection system or the color picture tube. In Fig. 1, the x-axis is perpendicular to the plane of the drawing.

Das Ablenksystem 4 weist innerhalb eines Spulenkörpers 6 eine Ablenkwicklung für das horizontale Ablenkfeld auf. Auf dem Spulenkörper 6 ist die Ablenkwicklung 7 für das vertikale Ablenkfeld angeordnet. Die Ablenkwicklung 7 besteht aus zwei Wicklungshälften 7a und 7b, die beide auf einen Kern 8 gewickelt sind. Der Kern 8 ist ein konischer Toroid. Vor der Stirnseite 14 des Kernes 8 sind zwei Feldformer 9 vorhanden, von denen nur einer sichtbar ist. Diese ebenen, dünnen Feldformer 9 aus weichmagnetischem Material liegen beide in derselben durch die x-und die y-Achse aufgespannten Ebene, die senkrecht auf der z-Achse liegt. In Richtung der z-Achse gesehen, sind die Feldformer 9 etwa zur Hälfte von der Stirnseite 14 des Kernes 8 überdeckt. Die Feldformer 9 sind spiegelsymmetrisch zur x und y-Achse angeordnet, so daß ihre Mitten auf der x-Achse liegen.The deflection system 4 has a deflection winding for the horizontal deflection field within a coil former 6. The deflection winding 7 for the vertical deflection field is arranged on the coil former 6. The deflection winding 7 consists of two winding halves 7a and 7b, both of which are wound on a core 8. The core 8 is a conical toroid. In front of the end face 14 of the core 8 there are two field formers 9, only one of which is visible. These flat, thin field formers 9 made of soft magnetic material both lie in the same plane spanned by the x and y axes and perpendicular to the z axis. When viewed in the direction of the z-axis, the field formers 9 are approximately half covered by the end face 14 of the core 8. The field formers 9 are arranged mirror-symmetrically to the x and y axes, so that their centers lie on the x axis.

In Fig. 2 ist ein erstes Ausführungsbeispiel für die Feldformer 9 in der Draufsicht dargestellt. Der gezeigte Feldformer weist im wesentlichen die Form eines Ringsegmentes auf und der Segmentwinkel beträgt 120°. Die Breite des Ringsegments ist etwa 15 mm. Der Feldformer 9 ist in seiner Lage in bezug auf das Koordinatensystem so dargestellt, wie er an der Stirnseite 14 des Kerns 8 im Ablenksystem 4 angeordnet ist. Das heißt, die Winkelhalbierende des Segmentwinkels fällt mit der x-Achse zusammen. Der Kern 8 ist der besseren Übersicht wegen ohne die Ablenkwicklung für das vertikale Ablenkfeld dargestellt. Nahe den Enden des Ringsegmentes ist je ein Loch im Feldformer 9 vorhanden. In diese Löcher greifen am Spulenkörper 6 vorhandene Stifte 13 ein, wodurch die Feldformer im Ablenksystem 4 gehalten werden.2 shows a first exemplary embodiment of the field former 9 in a top view. The field former shown has essentially the shape of a ring segment and the segment angle is 120 °. The width of the ring segment is approximately 15 mm. The position of the field former 9 in relation to the coordinate system is shown as it is arranged on the end face 14 of the core 8 in the deflection system 4. This means that the bisector of the segment angle coincides with the x-axis. The core 8 is shown for the sake of clarity without the deflection winding for the vertical deflection field. There is a hole in the field former 9 near the ends of the ring segment. Pins 13 on the coil former 6 engage in these holes, as a result of which the field formers are held in the deflection system 4.

In Fig. 3 ist die Draufsicht auf ein weiteres Ausführungsbeispiel der Feldformer 9 dargestellt. Die Außenkontur dieses Feldformers ist vieleckig. Im dargestellten Beispiel sind vier Ecken vorhanden, die spiegelsymmetrisch zur x-Achse liegen. Das erste Paar Ecken 11 liegt ± 18° und das zweite Paar Ecken 12 liegt etwa ±45° von der x-Achse entfernt. Die Verbindungslinie von der Ecke 11 zur Ecke 12 schließt dabei mit einer auf der x-Achse senkrecht stehenden Linie einen Winkel von etwa 26° ein.3 shows the top view of a further exemplary embodiment of the field former 9. The outer contour of this field former is polygonal. In the example shown, there are four corners that are mirror-symmetrical to the x-axis. The first pair of corners 11 is ± 18 ° and the second pair of corners 12 is approximately ± 45 ° from the x-axis. The connecting line from corner 11 to corner 12 includes an angle of approximately 26 ° with a line perpendicular to the x-axis.

Die Feldformer 9 können auch an ihrer Innenkontur vieleckig gestaltet sein. Es ist auch möglich, die Außen- und die Innenkontur vieleckig auszubilden.The field formers 9 can also have a polygonal shape on their inner contour. It is also possible to make the outer and inner contours polygonal.

Um die Wirkung der Feldformer abzuschwächen ist es auch möglich, aus den Feldformern 9 symmetrisch zur x-Achse ein Segment herauszutrennen. Die hierdurch entstehenden vier Feldformer nehmen im Ablenksystem 4 den gleichen Platz ein, wie die beiden in Figur 1 beschriebenen Feldformer. Bei vier Feldformern kann auch eine paarweise Anordnung in verschiedenen x-y-Ebenen vorgenommen werden.In order to weaken the effect of the field shapers, it is also possible to cut a segment out of the field shapers 9 symmetrically to the x-axis. The resulting four field formers take up the same space in the deflection system 4 as the two field formers described in FIG. 1. With four field formers, it can also be arranged in pairs in different x-y planes.

Das von der vertikalen Ablenkwicklung erzeugte Ablenkfeld ist ein inhomogenes Feld, das im vorderen Teil kissen- und im hinteren Teil des Ablenksystems tonnenförmig verformt ist. Dieses inhomogene Feld kann durch die Überlagerung eines Dipols mit einem Sextupol und mit Multipolen höherer Ordnung beschrieben werden. Die Feldformer 9 verstärken den Sextupol und die Multipole höherer Ordnung so, daß sich im vorderen Teil des Ablenksystems ein starkes kissenförmiges Feld ergibt. Hiermit wird erreicht, daß in x-Richtung (Ost/West-Richtung) auf dem Bildschirm der Farbbildröhre keine kissenförmigen Verzeichnungen vorhanden sind. Die Ecken 11, 12 in der Außen- bzw. in der Innenkontur der Feldformer verstärken dabei insbesondere die Multipole höherer Ordnung.The deflection field generated by the vertical deflection winding is an inhomogeneous field, which is deformed in the shape of a cushion in the front part and in the rear part of the deflection system in a barrel shape. This inhomogeneous field can be described by the superposition of a dipole with a sextupole and with multipoles of higher order. The field formers 9 reinforce the sextupole and the multipole of higher order so that there is a strong pillow-shaped field in the front part of the deflection system. This ensures that there are no pincushion distortions in the x direction (east / west direction) on the screen of the color picture tube. The corners 11, 12 in the outer and in the inner contour of the field formers, in particular, reinforce the multipoles of higher order.

Claims (8)

1. Deflection system for a colour picture tube provided with an in-line gun system, which is placed on the outside around the neck of the colour picture tube and contains two deflection coils which are independent of one another, with the deflection coil for the vertical deflection field being wound onto a core and with field formers of soft-magnetic material being disposed in the proximity of the front side of the core, characterized in that the field formers (9) essentially have the shape of a plane, thin ring segment and that at least two field formers (9) are disposed in such a way on the end face (14) of the core (8) within the vertical deflection field that the planes of the field formers (9) are in the X-Y plane of the deflection system (4) or of the colour picture tube and are disposed mirror-symmetrically in relation to both the X and the Y axes.
2. A deflection system as claimed in Claim 1, characterized in that the planes of all field formers (9) are in only one X-Y plane of the deflection system (4).
3. A deflection system as claimed in Claim 1, characterized in that, where there are two field formers (9), the segment angle of each ring segment is 120° and that the centres of the field formers (9) are on the X axis.
4. A deflection system as claimed in Claim 1, 2 or 3, characterized in that the field formers (9) have a polygonal outer contour.
5. A deflection system as claimed in Claim 4, characterized in that the corners (11, 12) are disposed mirror-symmetrically in relation to the X axis.
6. A deflection system as claimed in Claim 5, characterized in that the corners (11, 12) are at ± 18° and ±45° in relation to the X axis.
7. A deflection system as claimed in Claim 1, 2 or 3, characterized in that the field formers (9) have a polygonal inner contour.
8. A deflection system as claimed in any one of the preceding claims, characterized in that there are four field formers (9).
EP85113770A 1984-10-31 1985-10-29 Deflection system for colour picture tubes Expired EP0180205B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439808 1984-10-31
DE19843439808 DE3439808A1 (en) 1984-10-31 1984-10-31 DEFLECTION SYSTEM FOR COLORED TUBES

Publications (2)

Publication Number Publication Date
EP0180205A1 EP0180205A1 (en) 1986-05-07
EP0180205B1 true EP0180205B1 (en) 1988-06-29

Family

ID=6249179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113770A Expired EP0180205B1 (en) 1984-10-31 1985-10-29 Deflection system for colour picture tubes

Country Status (5)

Country Link
US (1) US4668929A (en)
EP (1) EP0180205B1 (en)
JP (1) JPS61110945A (en)
CA (1) CA1236512A (en)
DE (2) DE3439808A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device
NL8503544A (en) * 1985-12-23 1987-07-16 Philips Nv IMAGE DISPLAY SYSTEM WITH AN IN-LINE COLOR IMAGE TUBE.
NL8701421A (en) * 1987-06-18 1989-01-16 Philips Nv IMAGE DISPLAY ELEMENT.
GB2208034A (en) * 1987-08-13 1989-02-15 Ibm Reducing magnetic radiation in front of a cathode ray tube screen
MY107095A (en) * 1989-03-13 1995-09-30 Ibm Magnetic shunt for defletion yokes.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224530A (en) * 1975-07-01 1977-02-24 Matsushita Electric Ind Co Ltd Image formation method
JPS5418874A (en) * 1977-07-12 1979-02-13 Toppan Printing Co Ltd Fiber-filled sheet and its production
JPS5475215A (en) * 1977-11-29 1979-06-15 Toshiba Corp Deflecting unit
US4357586A (en) * 1980-05-14 1982-11-02 Rca Corporation Color TV display system
US4433268A (en) * 1980-08-19 1984-02-21 Tokyo Shibaura Denki Kabushiki Kaisha Deflection yoke for a color cathode ray tube
FR2534065A1 (en) * 1982-10-05 1984-04-06 Videocolor Sa PROCESS FOR TRANSFORMING A DEVIATOR FOR ITS USE FOR TUBES WITH SELF-CONTAINING IMAGES OF DIFFERENT DIMENSIONS AND DEVIATOR THUS OBTAINED
US4429293A (en) * 1983-05-13 1984-01-31 Rca Corporation Pincushion raster corrector distortion with improved performance
US4451807A (en) * 1983-07-27 1984-05-29 Rca Corporation Television raster pincushion distortion correction device

Also Published As

Publication number Publication date
JPS61110945A (en) 1986-05-29
DE3563579D1 (en) 1988-08-04
DE3439808A1 (en) 1986-04-30
US4668929A (en) 1987-05-26
EP0180205A1 (en) 1986-05-07
CA1236512A (en) 1988-05-10

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