EP0635163B1 - Selbstkonvergierende und in der geometrie korrigierte elektronenablenkeinheit für kathodenstrahlröhren - Google Patents

Selbstkonvergierende und in der geometrie korrigierte elektronenablenkeinheit für kathodenstrahlröhren Download PDF

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Publication number
EP0635163B1
EP0635163B1 EP93907920A EP93907920A EP0635163B1 EP 0635163 B1 EP0635163 B1 EP 0635163B1 EP 93907920 A EP93907920 A EP 93907920A EP 93907920 A EP93907920 A EP 93907920A EP 0635163 B1 EP0635163 B1 EP 0635163B1
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EP
European Patent Office
Prior art keywords
deflection
winding
coil
conductors
deflection device
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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 - Lifetime
Application number
EP93907920A
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English (en)
French (fr)
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EP0635163A1 (de
Inventor
Bruno Roussel
Alain Dumesnil
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Thomson Tubes and Displays SA
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Thomson Tubes and Displays SA
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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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • 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 present invention relates to a device for deflection of electron beams from a barrel three-beam electrons in a line from a ray tube cathodic including a screen slab substantially plane.
  • the device of deflection also called deflector has the function of deflect the beams to make them explore the whole the screen surface of the tube to generate the images and to ensure the convergence of these beams during all the exploration.
  • the volume swept by the beams of electrons is a pyramid whose apex is confused with the deflection center of the deflection device and whose intersection with a large screen surface radius of curvature determines a figure with a defect in geometry called cushion. This distortion the geometric of the image is all the stronger as the radius of curvature of the tube screen is important.
  • the so-called self-converging deviators generate fields magnetic astigmatic lines and wefts to ensure the convergence of electronic beams up to perforations in the mask for selecting colors, placed at a very short distance from the screen of the tube.
  • the lines of force of the magnetic fields created must then be in cushion for the line field and in barrel for the frame field.
  • Patent US 5077533 discloses that corrections of geometry of the image can be brought by an auxiliary winding so as to add to the deflection field generated by the main winding of 3, 5 or higher harmonic components. However, it is not indicated how to avoid that by increasing the value of harmonic 3 we can avoid introducing an increase in responsible harmonic 5 deconvergence of the beams in the corners of the screen.
  • the object of the present invention is to minimize the deformation of NORTH / SOUTH geometry generated by a substantially flat screen while preserving the convergence of electron beams.
  • the rear zone closest to the electron gun, especially influences coma or difference in green image size compared to blue images and red
  • the middle area of the diverter acts more particularly on astigmatism or the convergence of red and blue electron beams
  • the area front located closest to the tube screen acts on the geometry of the image that will form on the screen.
  • Figure 1 shows the action of the main lines of the horizontal deflection magnetic fields 1, depending on the direction of the X and vertical axis 2, along the disrection of the Y axis, on the geometry of the image.
  • Sure the figure are represented in A the electron beam corresponding to the upper right corner of the image and 3 and 4 the electron beams corresponding to the edges of the image.
  • the distribution of the turns must be of the line coil be such that the decomposition into Fourier series of the angular distribution of the ampere-turns density in the coil a significant percentage of harmonic 3 compared to to the fundamental.
  • French patent FR2411486 describes a coil, shown in Figure 2, in which we reverse the direction of current in part 20 (dotted on the figure) of the winding 21.
  • This structure allows increase the share of harmonic 3 but also causes over-convergence of electron beams if this part is very important as it is when it comes to to correct the geometry of a screen with a large radius curvature; in addition, the turns 20 decrease the L / R ratio between the value of the inductance of the coil 21 and its resistance which increases the power supplied required to scan the screen.
  • Figure 4 is a sectional view along a plane perpendicular to the main Z axis of the part tube front of a saddle coil according to the invention. Given the symmetry along the Y axis, only the section of a half reel is shown.
  • This half reel includes a first part constituting a coil main 21, whose conductors 23 are supplied with so that the current flowing through it flows in a certain direction 30 and a second part 22, constituting an auxiliary coil located at the front of the diverter, supplied so that the current, within conductors 24 flows there in a direction 31, opposite to previous.
  • the conductors 24 are arranged in such a way that they occupy an angular opening ( ⁇ 1 ⁇ ⁇ 2 ) and are distributed around an average angle ⁇ M , on either side of which there is a substantially equal number of conductors 24 .
  • N ( ⁇ ) A1.COS ( ⁇ ) + A3. COS (3 ⁇ ) + A5.COS (5 ⁇ ) + ... + AK.COS (K ⁇ ) + ... with
  • R is the radius of the ferrite magnetic circuit which covers the deflection coils in order to concentrate the fields to improve the energy efficiency of the deflection device and
  • A1 / R represents the fundamental field, (A3 / R 3 ).
  • (X 2 -Y 2 ) the harmonic 2 of the field, (A5 / R 5 ).
  • a positive A3 term corresponds to a harmonic 2 of positive field strength and induces field strength lines cushion.
  • Figure 5 represents according to ⁇ , the terms COS ( ⁇ ), COS (3 ⁇ ), COS (5 ⁇ ) ... for ⁇ understood between 0 ° and 90 °.
  • the conductors constituting it will preferably be arranged between 0 ° and 20 ' values for which COS (3 ⁇ ) remains greater than 0.5.
  • the angular position of the coil conductors main introduces a percentage important harmonic 5 of ampere-turns density that it is possible to compensate by the same winding auxiliary by placing the conductors 24 in an area where N ( ⁇ ) .COS (5 ⁇ ) is negative (in order to avoid harmonic 5 introduced by the main coil) this which, for N ( ⁇ ) negative can be achieved by arranging the majority of conductors 24 in an angular position between 54 ° and 90 °.
  • the average angular position ⁇ M increases as and as we move away from the screen.
  • This coil structure also makes it possible to limit to acceptable values the decrease in the L / R ratio of the horizontal deflection coil because in this case the conductors 24 occupy a smaller area than conductors 20 of the state of the art.
  • the auxiliary winding is arranged in the front third of the main winding.
  • the coil 21 extends in Z over a length of approximately 90mm and has 32 turns while the coil 22 extends along Z over a length of 20mm and has 14 turns.
  • the two windings are arranged in series, so that the current in the auxiliary winding flows in the opposite direction to the current in the main winding.
  • the arrangement in series of the two windings is not limiting, the winding 22 being able to be obviously supplied by a second external source.
  • the conductors 24 are arranged around an angular position ⁇ M of between 58 ° and 71 °, increasing as one moves away from the part of the winding closest to the screen of the tube, the conductors 24 being wound between 54 ° and 80 °.
  • the deflection device being divided into three zones, the front zone 47, closest to the screen of the tube, the central zone 46 and the rear zone 45, FIGS. 6, 7, 8 show, along the axis Z, the modifications of the amplitude of the deflector line field 43 introduced by the auxiliary coil positioned at 44 in the front part 47 of the main winding, that is to say as close as possible to the screen of the tube.
  • the amplitude of the harmonic 3 is roughly doubled, from 51 without the coil 22 to 41 after addition of this coil; thus the amplitude obtained 41 of the harmonic 3 is found to be greater than that of the fundamental 40 by about 12%.
  • the amplitude of the harmonic 5 is reduced from 52 to 42, thereby improving the convergence of the beams in the corners of the screen.
  • some of the conductors 23 of the main winding 21 located in the middle part 46 of the diverter are shifted towards inside the coil 21 over a length 48.
  • the Figures 9.1 and 9.2 illustrate this embodiment in showing a line coil in which all of conductors are shifted towards the inside of the coil. In a section along a plane perpendicular to Z passing through zone 48, this offset is represented by the angle a.
  • This offset makes it possible to decrease locally, in zone 46, the importance of harmonic 3 of the angular distribution of ampere-turns density in the winding, an excessive value of which could lead to a deconvergence of electron beams, but that it it is necessary to have in zone 47 to be able to obtain effective correction of cushion deformation.
  • the conductors of the coil 21 of the deflector equipping this tube are offset by an angle equal to about 10 ° in the middle zone 46.
  • the coil 22 creating a magnetic field from oppose that of the main coil 21 is made up of main coil conductors, wound up in such a way that they open a window 35 in the crown 36 of the main winding, window extending inwardly of the coil 21; thereby current flows in opposite directions 30 and 31 in both winding parts 21 and 22.
  • Another way of implementing the principle of the invention is to use an auxiliary coil 22 whose conductors are short-circuited on themselves.
  • the magnetic field created by the main coil 21 induces in the auxiliary coil a current which tends to oppose the variation in flux seen from this coil 22. It therefore appears in the strands of the coil 22 a current of opposite direction to that circulating in the coil 21.
  • This embodiment allows a greater correction of the NORTH / SOUTH geometry than in the case where the coils 21 and 22 are in series because the induced current reaches a value greater than that of the circulating current in the main coil.
  • this type of embodiment makes it possible to simplify the wiring of the coils 21 and 22 and avoids running wires subjected to high voltages such as the return voltage of the horizontal scan.
  • the apparent L / R ratio is improved, the short-circuited turns no longer being taken into account in the resistance of the deflector.

Landscapes

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

Claims (7)

  1. Ablenkvorrichtung für eine Farb-Kathodenstrahlröhre mit drei koplanaren Elektronenkanonen, enthaltend ein Paar von Horizontal-Ablenkspulen und ein Paar von Vertikal-Ablenkspulen, wobei jede Horizontal-Ablenkspule eine Haupt-Ablenkwicklung (21), die sich über die Länge der Ablenkvorrichtung erstreckt, und eine Hilfs-Ablenkwicklung (22) enthält, die im vorderen Teil der Hauptwicklung liegt und derart gespeist ist, daß sie ein Magnetfeld (31) erzeugt, das entgegengesetzt ist zu dem Feld der Hauptwicklung in dem vorderen Teil jeder der Spulen des Paares von Horizontal-Ablenkspulen, wobei die dritte Harmonische der FOURIER-Zerlegung der Winkelverteilung der Ampère-Windungsdichte im wesentlichen gleich oder größer ist als die der Grundschwingung, dadurch gekennzeichnet. daß die Leiter (24) der Hilfswick-lung (22) seitlich über einen mittleren Winkel (M) bezüglich der Horizontal-Ablenkachse verteilt sind und dieser mittlere Winkel sich in Abhängigkeit von der Lage dieser Leiter entlang der Längsachse (2) der Ablenkvorrichtung derart ändert, daß die Amplitude der fünften Harmonischen der FOURIER-Reihenzerlegung der Winkelverteilung der durch die Haupt-Ablenkwicklung erzeug-ten Ampère-Windungsdichte verringert wird.
  2. Ablenkvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der mittlere Winkel (M) zwischen 50° und 65° liegt.
  3. Ablenkvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Wert des mittleren Winkels (M), um den die Leiter der Hilfswicklung (22) angeordnet sind, in dem Maß ansteigt, wie man von dem vorderen Teil dieser Wicklung entfernt ist.
  4. Ablenkvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Mehrzahl der Leiter (24) der Hilfswicklung seitlich in einer Winkellage zwischen 54° und 90° liegt.
  5. Ablenkvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Teil der Leiter (32) der Hauptwicklung (21), der in dem mittleren Bereich dieser Wicklung liegt, zum Inneren der Wicklung versetzt ist.
  6. Ablenkvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Leiter (24) der Hilfswicklung (22) untereinander kurzgeschlossen sind.
  7. Kathodenstrahlröhre, dadurch gekennzeichnet, daß sie mit einer Ablenkvorrichtung mit einem der vorhergehenden Ansprüche ausgerüstet ist.
EP93907920A 1992-04-07 1993-04-02 Selbstkonvergierende und in der geometrie korrigierte elektronenablenkeinheit für kathodenstrahlröhren Expired - Lifetime EP0635163B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9204249A FR2689679A1 (fr) 1992-04-07 1992-04-07 Dispositif de déflexion des faisceaux d'électrons pour tubes à rayons cathodiques autoconvergent et corrigé en géométrie.
FR9204249 1992-04-07
PCT/FR1993/000331 WO1993020578A1 (fr) 1992-04-07 1993-04-02 Dispositif de deflexion des faisceaux d'electrons pour tubes a rayons cathodiques autoconvergent et corrige en geometrie

Publications (2)

Publication Number Publication Date
EP0635163A1 EP0635163A1 (de) 1995-01-25
EP0635163B1 true EP0635163B1 (de) 1998-12-16

Family

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EP93907920A Expired - Lifetime EP0635163B1 (de) 1992-04-07 1993-04-02 Selbstkonvergierende und in der geometrie korrigierte elektronenablenkeinheit für kathodenstrahlröhren

Country Status (6)

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EP (1) EP0635163B1 (de)
JP (1) JP3502634B2 (de)
KR (1) KR950701765A (de)
DE (1) DE69322629T2 (de)
FR (1) FR2689679A1 (de)
WO (1) WO1993020578A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519371A (en) * 1993-12-22 1996-05-21 Sony Corporation Deflection apparatus
KR100192233B1 (ko) * 1995-11-30 1999-06-15 구자홍 브라운관용 편향요크
JP3543900B2 (ja) * 1996-12-27 2004-07-21 松下電器産業株式会社 陰極線管装置
KR100609195B1 (ko) * 1998-11-10 2006-08-02 마츠시타 덴끼 산교 가부시키가이샤 편향요크 및 그것을 이용한 컬러수상관장치
FR2797994B1 (fr) * 1999-08-30 2001-12-07 Thomson Tubes & Displays Unite de deflexion pour tube a rayons cathodiques autoconvergents comportant des bobines de deviation verticales en forme de selle
FR2797993B1 (fr) * 1999-08-30 2001-10-26 Thomson Tubes & Displays Unite de deflexion pour tube a rayons cathodiques comportant des bobines de deviation verticales en forme de selle

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411486A1 (fr) * 1977-12-07 1979-07-06 Videon Sa Bobine de deviation perfectionnee
NL8300031A (nl) * 1983-01-06 1984-08-01 Philips Nv Inrichting voor het weergeven van televisiebeelden en afbuigeenheid daarvoor.
JPS59184439A (ja) * 1983-04-01 1984-10-19 Hitachi Ltd 偏向ヨ−ク
NL8400886A (nl) * 1984-03-21 1985-10-16 Philips Nv Werkwijze voor het vervaardigen van een zadelvormige afbuigspoel voor een beeldweergeefbuis en afbuigsysteem met zadelvormige afbuigspoelen.
US4556857A (en) * 1984-10-01 1985-12-03 General Electric Company Deflection yoke for small gun-base CRT
JPH01161644A (ja) * 1987-12-18 1989-06-26 Victor Co Of Japan Ltd 偏向ヨーク
JP3002481B2 (ja) * 1989-10-30 2000-01-24 株式会社日立製作所 偏向ヨーク
US5077533A (en) * 1990-09-28 1991-12-31 Syntronic Instruments, Inc. Cathode ray tube deflection yoke arrangement

Also Published As

Publication number Publication date
DE69322629D1 (de) 1999-01-28
DE69322629T2 (de) 1999-05-06
JPH07509093A (ja) 1995-10-05
JP3502634B2 (ja) 2004-03-02
KR100430129B1 (de) 2004-07-15
WO1993020578A1 (fr) 1993-10-14
KR950701765A (ko) 1995-04-28
EP0635163A1 (de) 1995-01-25
FR2689679A1 (fr) 1993-10-08

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