EP0180205B1 - Système de déviation pour tubes à rayons en couleurs - Google Patents

Système de déviation pour tubes à rayons en couleurs 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0180205A1 (fr
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/fr
Application granted granted Critical
Publication of EP0180205B1 publication Critical patent/EP0180205B1/fr
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.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Claims (8)

1. Système de déviation pour un tube image couleur pourvu d'un système de canons électroniques en ligne, disposé à l'extérieur, autour du col du tube image couleur, et comportant deux bobines de déviations indépendantes l'une de l'autre, la bobine de déviation pour le champ de déviation verticale étant enroulée sur un noyau et des conformateurs de champ en matériau magnétique doux étant disposés à proximité de la face avant du noyau, caractérisé en ce que les conformateurs de champ (9) ont essentiellement la forme d'un segment d'anneau mince et plan et en qu'au moins deux conformateurs de champs (9) sont disposés sur la face terminale (14) du noyau (8), dans le champ de déviation verticale, de telle façon que les plans des conformateurs de champ (9) soient dans le plan X-Y du système de déviation (4) du tube image couleur et que ceux- ci soient symétriquement disposés, avec inversion, à la fois par rapport aux axes X et Y.
2. Système de déviation conforme à la revendication 1, caractérisé en ce que les plans de tous les conformateurs de champ (9) sont dans un seul plan X-Y du système de déviation (4).
3. Système de déviation conforme à la revendication 1, caractérisé en ce que, dans le cas de deux conformateurs de champ (9), l'angle du segment de chaque segment en anneau est de 120° et en ce que les centres des conformateurs de champ (9) sont sur l'axe X.
4. Système de déviation conforme à la revendication 1, ou 3, caractérisé en ce que les conformateurs de champ (9) ont un contour extérieur polygonal.
5. Système de déviation conforme à la revendication 4, caractérisé en ce que les sommets des angles (11, 12) sont symétriquement disposés par rapport à l'axe X.
6. Système de déviation conforme à la revendication 5, caractérisé en ce que les sommets (11, 12) sont à ± 18° et ±45° par rapport à l'axe X.
7. Système de déviation conforme à la revendication 1, 2 ou 3, caractérisé en ce que les conformateurs de champ (9) ont un contour intérieur polygonal.
8. Système de déviation conforme à l'une quelconque des revendications précédentes, caractérisé en ce que sont prévus quatre conformateurs de champ (9).
EP85113770A 1984-10-31 1985-10-29 Système de déviation pour tubes à rayons en couleurs Expired EP0180205B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843439808 DE3439808A1 (de) 1984-10-31 1984-10-31 Ablenksystem fuer farbbildroehren
DE3439808 1984-10-31

Publications (2)

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

Family

ID=6249179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113770A Expired EP0180205B1 (fr) 1984-10-31 1985-10-29 Système de déviation pour tubes à rayons en couleurs

Country Status (5)

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

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 (nl) * 1985-12-23 1987-07-16 Philips Nv Beeldweergeefsysteem met een in-lijn kleurenbeeldbuis.
NL8701421A (nl) * 1987-06-18 1989-01-16 Philips Nv Beeldweergeefelement.
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 (fr) * 1982-10-05 1984-04-06 Videocolor Sa Procede de transformation d'un deviateur permettant son utilisation pour des tubes a images autoconvergents de dimensions differentes et deviateur ainsi obtenu
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
US4668929A (en) 1987-05-26
DE3563579D1 (en) 1988-08-04
EP0180205A1 (fr) 1986-05-07
JPS61110945A (ja) 1986-05-29
CA1236512A (fr) 1988-05-10
DE3439808A1 (de) 1986-04-30

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