EP0269504B1 - Verfahren und Vorrichtung zur Einstellung der statischen Konvergenz und/oder Reinheit für eine Farbfernsehröhre - Google Patents

Verfahren und Vorrichtung zur Einstellung der statischen Konvergenz und/oder Reinheit für eine Farbfernsehröhre Download PDF

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Publication number
EP0269504B1
EP0269504B1 EP87402513A EP87402513A EP0269504B1 EP 0269504 B1 EP0269504 B1 EP 0269504B1 EP 87402513 A EP87402513 A EP 87402513A EP 87402513 A EP87402513 A EP 87402513A EP 0269504 B1 EP0269504 B1 EP 0269504B1
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EP
European Patent Office
Prior art keywords
tube
deflector
purity
coil
axis
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 - Lifetime
Application number
EP87402513A
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English (en)
French (fr)
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EP0269504A1 (de
Inventor
Claude Pons
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Videocolor SA
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Videocolor SA
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Publication of EP0269504A1 publication Critical patent/EP0269504A1/de
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/703—Static convergence systems

Definitions

  • the invention relates to a method and a permanent magnet device for adjusting the static convergence and / or the purity of a color television tube.
  • a color television (or viewing) tube usually comprises three electron guns intended to excite phosphors arranged against the internal face of the slab, or front part, of the tube. These luminophores are arranged in a group of three points (triads) or three bands and in each group a point or a band is intended to emit, when it is excited, a light of a determined color, in general red, green or blue.
  • a perforated mask is placed in front of the screen so that each phosphor is only excited by the electron gun intended to excite the corresponding color.
  • each diverter consists of a coil supplied with current; the two coils are generally mounted on the same support around the neck and the flared part of the television tube.
  • the three electron beams must also have precise positions relative to the screen, the barrel assigned to a color should reach only the phosphors producing this color. Otherwise the colors are not pure. To this end, during the manufacture of the tube, a so-called purity adjustment is carried out.
  • the settings that involve sweeping that is, the deflectors, are called dynamic settings. They consist in precisely positioning the deflector relative to the rest of the tube.
  • Purity and static convergence settings are of this type. They are carried out either by displacement of magnets, or by modulation of the induction of the poles of a magnetizable ring arranged around the neck of the cathode ray tube.
  • application EP-A-123 611 in the name of the applicant a method of adjusting the purity and the static convergence of the tube is described, which comprises a magnetic ring placed around the neck in which eight poles are regularly distributed around the 'axis using magnet coils which are applied against the outer surface of the ring so that a current of a given intensity in a coil generates a magnet pole having a well-defined induction.
  • the magnetization process is, for example, that described in French Patent 2,545,265, also in the name of the application, which consists in strongly magnetizing the magnetic material then in decreasing the magnetization by reversing it until reaching induction allowing the adjustment of static convergence and / or purity.
  • each coil produces outside its turns a field of direction opposite to that which it generates inside the turns; the useful field is that produced inside the turns; on the other hand the field of opposite direction creates around each pole a pole of opposite direction which is at the origin of the imprecision noted. This imprecision is all the greater the higher the number of poles.
  • the invention overcomes these drawbacks.
  • the method according to the invention is characterized as indicated in the claim.
  • each element is made of a device for measuring errors of purity and static convergence, and the relationship between each error and the current to be supplied.
  • each coil being known by a prior calibration, a calculation means is used so that each coil receives the quantity of energy which it needs to carry out the correction.
  • the magnetizable elements are for example made of "plastoferrite”, that is to say made of a ferrite (for example of barium) embedded in a plastic material.
  • each magnetizable element is preferably rectangular with sides parallel to the axis of the tube. For the same size, this shape allows a more effective correction than others, such as circular or elliptical shapes.
  • the magnetizable elements are fixed on the support of the deflector. So it is not necessary to provide supports particular for these elements; in addition, these magnetizable elements can be mounted on the support of the deflector before the installation of the latter on the tube itself, so that for the static convergence and purity adjustments there is no mechanical operation to be performed such that '' a displacement of the magnetizable elements or a collage.
  • a quantity of magnetizable material is used which is less than that used with a continuous ring.
  • the windings 10 of the deflector of a color television tube are mounted on a frusto-conical part of a plastic support 11, between two flanges 12, at the front, and 13, at the rear, which extend in a plane perpendicular to the axis 14 of the tube (coincident with the axis of the support).
  • the support 11 has a cylindrical projection 15 with an axis coincident with the axis 14 of the tube and intended to receive a clamp 16 of the support on the tube.
  • the magnetizable elements of the invention are fixed, for example by gluing, to the external face 17 of this cylindrical projection 15, in the example between the flange 13 and the collar 16.
  • magnetizable elements 181 182 ... 188 are eight in number. They are arranged regularly around the axis 14. All the elements have the same shape and the same dimensions and are made of the same material, namely a formed plastoferrite. of a barium ferrite embedded in a plastic matrix. Each element 18 is formed of a rectangular plate, preferably square, with two sides 19 and 20 parallel to the axis 14.
  • the distribution of the plates is such that: the axis 21 connecting the centers of the plates 184 and 188 is parallel to the horizontal axis of the screen; the axis 22 connecting the centers of 182 and 186 inserts is parallel to the vertical axis of the screen and the axes connecting the other diametrically opposite inserts: 183 and 187, and 181 and 185, are at 45 ° to the axes 21 and 22.
  • an apparatus comprising eight magnetizing coils 231 ... 238 each of which is wound on a core 241 ... of square section with a side of length slightly greater than the side of the square of the corresponding plate 18. To effect the magnetization, the end 25 of the core 24 is applied against the external face of the plate 18.
  • the section of the coil 23 is larger than the section of the plate 18 the latter is subjected only to the internal field of the coil; this field has only one meaning.
  • the last turn of the coil 23 is practically in the plane of the end 25 of the core 24.
  • the turns of the coil are beyond the end face 25 of the core 24 so that these turns completely cover the wafer 18.
  • Each element 18 is in a uniform field area. No part of the magnetic material is in the vicinity of the periphery of the coils, which is a zone of strong variation and inversion of the field. The magnetization is thus maximum and of great uniformity. In addition there is no interaction between the poles.
  • the coils 23 are, for the manufacture of each tube, moved radially using electric motors and means for converting the rotational movement into a translational movement or using electromagnets to apply and then move these coils away from the pads.
  • sliding coils are preferably fixed to the platform normally used to support the deflector and position it on the tube, which is favorable to the correct positioning of each coil 23 relative to the corresponding magnetic element 18; indeed each coil 23 then has a well-determined position (by the platform) relative to the deflector and therefore relative to the associated element 18.
  • the platform is for example that described in French Patent 2,545,266 in the name of the applicant.
  • D is a vector with 6 components (two for each beam) representing the displacements of the points of impact of the electron beams on the screen; B represents the 8 current values applied to the adjustment coils and K is the matrix of calibration coefficients with 6 lines and 8 columns.
  • B is the vector of the 8 amplitudes of the adjustment pulses and A is the vector of the 6 actions (displacements) required, the measurement of these displacements resulting from the determination of the convergence faults static and purity; and C is the matrix with 8 rows and 6 columns of the calculated adjustment coefficients, which is deduced from the matrix K above.
  • the tube on which a deflector has been mounted is placed on an adjustment machine, for example the platform mentioned above. Then the magnetization coils 23 are applied, by the end faces 25 of their cores 24, against the corresponding plates 18. The errors of convergence and purity are noted in the center of the screen and the B pulses are computed, for example using a microprocessor, to correct the errors observed, according to the formula (2) above. .
  • This microprocessor is also used to control the magnetization sequence, which is carried out using two pulses of opposite directions as described in French Patent 2,545,265.
  • a single cycle of measurement of convergence and purity errors and of calculation of the magnetization pulses is generally not sufficient for the errors to be less than a predetermined limit. It will usually take 3 to 4 cycles for the convergence errors to be at most 0.1 mm and the purity errors at most about 10 ⁇ m. This constraint is not a problem if the magnetization method described in French Patent 2,545,265 is used, because with this method the total adjustment time is less than 10 seconds.
  • the dynamic adjustments are made: positioning and fixing of the diverter. After the dynamic settings you can review the static settings. 2 or 3 cycles of static and dynamic adjustments will suffice to obtain a satisfactory result.
  • the mean lines, perpendicular to the axis 14, of all the plates 18 are in the same plane.
  • other magnets are provided, the mean lines of which are in another (or several other) plane (s) perpendicular (s) to the axis 14.
  • These additional magnets can be used for example for horizontal centering of the image or to compensate for a misalignment of the guns relative to the screen.
  • the elements 18 are preferably mounted automatically on the support of the deflector before mounting this deflector on the tube itself.
  • the plates 18 are arranged directly on the neck of the tube, without using the support of the deflector.

Landscapes

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

Claims (13)

1. Verfahren zur Einstellung der statischen Konvergenz und/oder der Reinheit einer Farbfernsehröhre mit Hilfe von Permanentmagneten, dadurch gekennzeichnet, daß magnetisierbare Bauteile um die Röhre herum befestigt werden, wobei diese Bauteile um die Achse (14) der Röhre regelmäßig verteilt sind, und dadurch, daß zur Korrektur der Fehler der statischen Konvergenz und/oder der Rein­heit jedes Bauteil (18₁-18₈) mit Hilfe einer in Stellung und Abmessungen derart entsprechenden Spule (23), daß das Bauteil (18) ausschließlich dem Feld im Inneren der Spulenwicklungen ausgesetzt ist, magnetisiert wird.
2. Verfahren gemäß Patentanspruch 1, dadurch gekenn­zeichnet, daß jedes magnetisierbare Bauteil (18) im allgemeinen die Form einer rechteckigen oder quadrati­schen Platte aufweist, deren Seiten parallel zur Achse (14) der Röhre verlaufen.
3. Verfahren gemäß Patentanspruch 1 oder 2, dadurch gekenn­zeichnet, daß die Platten in Form und Abmessungen gleich sind.
4. Verfahren gemäß Patentanspruch 2, dadurch gekenn­zeichnet, daß die auf der Achse (14) der Röhre senkrecht stehenden Mittellinien der Platten (18) in derselben Ebene liegen.
5. Verfahren gemäß irgendeinem der vorangehenden Patent­ansprüche, dadurch gekennzeichnet, daß die magnetisier­baren Bauteile (18) am Träger (11) der Ablenkeinheit befestigt sind.
6. Verfahren gemäß Patentanspruch 5, in dem ein Träger für die Ablenkeinheit verwendet wird, der einen kegelstumpf­förmigen Teil, der durch eine vordere Krempe (12) und eine hintere Krempe (13) begrenzt wird, sowie einen hinteren zylindrischen Teil (15) aufweist, dadurch gekennzeichnet, daß die magnetisierbaren Bauteile am genannten zylindrischen Teil befestigt werden.
7. Verfahren gemäß Patentanspruch 5 oder 6, dadurch gekennzeichnet, daß die magnetisierbaren Bauteile vor Montage des Trägers der Ablenkeinheit auf der Röhre an diesem Träger befestigt werden.
8. Verfahren gemäß irgendeinem der vorangehenden Patent­ansprüche, dadurch gekennzeichnet, daß jede Magnetisie­rungsspule eines magnetisierbaren Bauteils auf einem Kern (24) gewickelt ist und dadurch, daß die Endwicklung dieser Spule in derselben Ebene liegt, wie die Endfläche (25) des Kerns.
9. Verfahren gemäß irgendeinem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, daß das Ende der Magnetisie­rungsspule bei der Magnetisierung das entsprechende magnetisierbare Bauteil überdeckt.
10. Verfahren gemäß irgendeinem der vorangehenden Patent­ansprüche, dadurch gekennzeichnet, daß die Spulen zur Magnetisierung der magnetisierbaren Bauteile auf einer Plattform angebracht sind, die die Ablenkeinheit stützt und ebenfalls die Mittel zur Positionierung dieser Ablenkeinheit umfaßt.
11. Farbfernsehröhre, eine Ablenkeinheit (10) mit um die Röhre im engeren Sinne herum montiertem Träger (11), sowie Mittel zur Einstellung der statischen Konvergenz und/oder der Reinheit vom Permanentmagnettyp aufweisend, dadurch gekennzeichnet, daß die Mittel zur Einstellung der statischen Konvergenz und/oder der Reinheit aus getrennten Permanentmagneten (18) bestehen, die regel­mäßig um die Achse (14) der Röhre herum angeordnet und am Träger (11) der Ablenkeinheit befestigt sind.
12. Röhre gemäß Patentanspruch 11, dadurch gekennzeichnet, daß jeder Magnet die Form einer Platte hat.
13. Röhre gemäß Patentanspruch 12, dadurch gekennzeichnet, daß jede Platte einen rechteckigen oder quadratischen Querschnitt mit Seiten (19, 20) parallel zur Achse (14) der Röhre hat.
EP87402513A 1986-11-12 1987-11-06 Verfahren und Vorrichtung zur Einstellung der statischen Konvergenz und/oder Reinheit für eine Farbfernsehröhre Expired - Lifetime EP0269504B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8615672A FR2606550B1 (fr) 1986-11-12 1986-11-12 Procede et dispositif pour le reglage de la convergence statique et/ou de la purete d'un tube de television en couleurs
FR8615672 1986-11-12

Publications (2)

Publication Number Publication Date
EP0269504A1 EP0269504A1 (de) 1988-06-01
EP0269504B1 true EP0269504B1 (de) 1991-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402513A Expired - Lifetime EP0269504B1 (de) 1986-11-12 1987-11-06 Verfahren und Vorrichtung zur Einstellung der statischen Konvergenz und/oder Reinheit für eine Farbfernsehröhre

Country Status (8)

Country Link
US (1) US4896071A (de)
EP (1) EP0269504B1 (de)
JP (1) JP2680000B2 (de)
CN (1) CN1018109B (de)
DE (1) DE3768072D1 (de)
FR (1) FR2606550B1 (de)
HK (1) HK25096A (de)
SG (1) SG16194G (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2871698B2 (ja) * 1988-08-24 1999-03-17 株式会社日立製作所 偏向ヨーク付きカラーブラウン管
JP2746932B2 (ja) * 1988-08-24 1998-05-06 株式会社日立製作所 カラーブラウン管用マグネット装置
US5179319A (en) * 1989-07-31 1993-01-12 Matsushita Electronics Corporation Deflection yoke for a color CRT
US5146411A (en) * 1990-05-29 1992-09-08 International Business Machines Corporation Computer-aided process for placement of crt trim magnets
EP0551027B1 (de) * 1992-01-10 1997-09-17 THOMSON TUBES & DISPLAYS S.A. Magnetische Fokussierungsvorrichtung
EP0562200B1 (de) * 1992-03-27 1996-08-14 THOMSON TUBES & DISPLAYS S.A. Permanentmagnet-Fokusiersystem mit integriertem Astigmatismuskorrektor
US5557164A (en) * 1995-03-15 1996-09-17 Chunghwa Picture Tubes, Ltd. Cathode ray tube with misconvergence compensation
US5828167A (en) * 1995-07-24 1998-10-27 Hitachi, Ltd. Color cathode ray tube with a dynamic convergence device and color display system employing same

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US3525831A (en) * 1968-07-03 1970-08-25 Westinghouse Electric Corp Operating mechanism for electric switch
US3912970A (en) * 1973-06-08 1975-10-14 Zenith Radio Corp Electron beam deflection correction system
NL7414845A (nl) * 1974-11-14 1976-05-18 Philips Nv Inrichting voor het weergeven van kleurentelevi- siebeelden.
US4001877A (en) * 1975-11-26 1977-01-04 Rca Corporation Method of measuring color purity tolerance of a color display tube
US4211960A (en) * 1976-03-19 1980-07-08 U.S. Philips Corporation Method of manufacturing a static convergence unit, and a color display tube comprising a convergence unit manufactured according to the method
NL7707476A (nl) * 1977-07-06 1979-01-09 Philips Nv Werkwijze voor het vervaardigen van een kleuren- beeldbuis en kleurenbeeldbuis vervaardigd vol- gens die werkwijze.
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FR2480032A1 (fr) * 1980-04-02 1981-10-09 Videocolor Procede d'analyse de la convergence d'un tube cathodique a trois canons en ligne et dispositif formant capteur permettant la mise en oeuvre de ce procede
NL8104735A (nl) * 1980-12-05 1982-07-01 Philips Nv Kathodestraalbuis met een afbuigeenheid met een samenstel van permanente magneten dat een statisch multipoolveld opwekt voor het simuleren van een modulatie van het dynamische afbuigveld.
US4369418A (en) * 1980-12-10 1983-01-18 Rca Corporation Deflection yoke incorporating a permeable corrector
FR2545264B1 (fr) * 1983-04-26 1985-12-13 Videocolor Sa Procede et appareil de reglage de la convergence statique et de la purete de tubes de television en couleurs
FR2545266B1 (fr) * 1983-04-26 1985-12-27 Videocolor Sa Appareil pour le reglage de la position d'un deviateur sur un tube de television, notamment en couleurs
FR2545265B1 (fr) * 1983-04-26 1985-12-13 Videocolor Sa Procede et appareil de reglage rapide, a l'aide d'un aimant permanent, de la convergence statique et de la purete d'un tube de television en couleurs
FR2547952B1 (fr) * 1983-06-21 1986-01-31 Videocolor Procede d'alignement d'un ensemble de canons a electrons pour un tube de television en couleurs et dispositif mettant en oeuvre le procede
JPS6028142A (ja) * 1983-07-27 1985-02-13 Hitachi Ltd 磁気コンバ−ゼンス装置を備えたインライン形カラ−受像管および磁気コンバ−ゼンス装置の製造装置
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Also Published As

Publication number Publication date
JPS63138633A (ja) 1988-06-10
JP2680000B2 (ja) 1997-11-19
US4896071A (en) 1990-01-23
SG16194G (en) 1994-06-10
DE3768072D1 (de) 1991-03-28
EP0269504A1 (de) 1988-06-01
HK25096A (en) 1996-02-16
CN87102951A (zh) 1988-05-25
CN1018109B (zh) 1992-09-02
FR2606550A1 (fr) 1988-05-13
FR2606550B1 (fr) 1989-01-13

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