EP0597533B1 - Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité - Google Patents

Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité Download PDF

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Publication number
EP0597533B1
EP0597533B1 EP19930203100 EP93203100A EP0597533B1 EP 0597533 B1 EP0597533 B1 EP 0597533B1 EP 19930203100 EP19930203100 EP 19930203100 EP 93203100 A EP93203100 A EP 93203100A EP 0597533 B1 EP0597533 B1 EP 0597533B1
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EP
European Patent Office
Prior art keywords
deflection unit
field correction
deflection
coils
correction elements
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
EP19930203100
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German (de)
English (en)
Other versions
EP0597533A1 (fr
Inventor
Bernardus Hendrikus Johannes Dekkers
Ronald Johannes Jacobus De Man
Antonius Jacobus Johannes Bolder
Albertus Aemilius Seyno Sluyterman
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP19930203100 priority Critical patent/EP0597533B1/fr
Publication of EP0597533A1 publication Critical patent/EP0597533A1/fr
Application granted granted Critical
Publication of EP0597533B1 publication Critical patent/EP0597533B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J29/701—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 an electromagnetic deflection unit for a cathode ray tube, comprising a hollow coil holder which supports a set of coils for electron beam deflection, said coils having parts extending substantially in the longitudinal direction of the coil holder at its inner side and field correction elements at the re-entrant side of said coils, the deflection unit further comprising, arranged within the set of coils, an annular support comprising predetermined locations for accommodating field correction elements, at a plurality of said predetermined locations field correction elements being accommodated.
  • the invention also relates to a colour display tube provided with such a deflection unit.
  • Such a deflection unit and a cathode ray tube (particularly a colour display tube) provided with such a unit are commercially available.
  • Predetermined locations is understood to mean that one type of annular support with fixed corrector locations is used for a series of display tubes of the same type (for example colour monitor tubes having a fixed screen diagonal).
  • the coils are arranged at the inner side of the coil holder in such a way that - when the deflection unit is mounted on a display tube - the coils are located as close as possible to the electron beams in the display tube.
  • the greater part of the preformed elements must generally be glued against the inner surface of the coils.
  • the rather non-flat surface of the coils may bring about a poor adhesion so that the preformed elements come loose. It is conventional practice to secure soft-magnetic preformed elements by means of adhesive tape and fix them with glue.
  • correctors of the permanent magnetic type, or magnetized preformed elements is preferred, and will hereinafter be described by way of example, but the invention is not limited thereto. Differences may reside in the strength (magnetic induction) and the direction of magnetization, dependent on the correction required for a given combination of display tube and deflection unit. Generally, corrections with magnetic fields having a field strength in the range between 1 and 1000 ⁇ T, may be sufficient, and in most cases corrections between 5 and 500 ⁇ T are sufficient. For providing these fields, correctors are used in the form of planar elements which produce these field strengths at a certain distance above their centre, which distance is associated with the distance from the electron beams.
  • an electromagnetic deflection unit having a conical coil holder with a flange which carries coils for the deflection of electron beams.
  • the coils have segments extending substantially in the longitudinal direction of the coil holder and near these segments soft-magnetic correction elements are arranged in an annular support.
  • the exact magnetic strength and polarity of the corrector needed for each corrector location can be determined with reference to the measured error pattern followed by individual magnetization of each corrector at the desired strength (and polarity).
  • An alternative is characterized in that the magnetized preformed elements have magnetic strengths which, while taking a given tolerance into account, have a limited number of fixed values. (For example, values which are a multiple of a given unit strength).
  • the preformed elements have an elongated (particularly rectangular) shape and have an in-plane direction of magnetization which is parallel to their short or their long axis. This provides the possibility of magnetizing all preformed elements in the same direction, while placing in a first position or in a 180° rotated position provides a choice of two opposite polarities.
  • the strength and the polarity of the correctors to be placed in the ring can be determined by means of a computer program with reference to the known effects of a reference corrector and the error pattern measured (for example, at 25 points on the screen). Each corrector has its own influence on the convergence pattern.
  • the correctors can be positioned rapidly and possibly automatically by using an annular corrector support having, for example a plurality of compartments arranged at fixed locations along a circular circumference for accommodating correctors.
  • the dimensions of the correctors are chosen to be such that the required (possibly large) number of correctors can be mounted in an annular support having given dimensions (dictated by the deflection unit with which it must cooperate).
  • annular support with the correctors at a position within the deflection coil system is also important, particularly at a position between the centre thereof and the front side.
  • saddle-type line deflection coils preferably proximate to the front transversal connection portions which interconnect the parts extending in the longitudinal direction of the coil holder.
  • the latter notably means that the convergence of the electron beams may be influenced at an instant when the electron beams have already been deflected, which is very effective.
  • each deflection unit can be measured on a standard display tube and each unit can be provided with a ring having correctors of the strength required for correcting errors caused by spreading. In a suitable measuring method the convergence is measured at, for example, 25 points on the display screen.
  • An alternative possibility is to measure each deflection unit on the display tube with which it must form a combination, to assemble a ring with correctors on the basis of the measured data, to remove the deflection unit from the display tube so as to place the ring and to put the deflection unit into position again.
  • the annular support may be placed on the (glass) envelope of the display tube, i.e. separate from the deflection unit.
  • the annular support is, however, secured to the coil holder. This facilitates handling of the deflection unit.
  • the support may be secured in different manners.
  • the annular support may have a very thin wall of the order of 1 mm, while compartments having a bottom thickness of between 0. 1 and 0.5 mm may have been recessed in this support.
  • the correctors may have the shape of very thin flat discs (comprising, for example a permanent magnetic ferrite material) arranged (for example, glued or clamped) in the compartments in the annular wall and do not, or hardly, extend outside the wall. Since the annular support replaces separately provided preformed elements of similar thickness, the use of the annular support does not involve any or hardly any larger distance between the inner deflection coils and a colour display tube extending within the deflection unit. Dependent on the required correction, the support may be provided with correctors at a plurality of locations or with correctors at all available locations.
  • the correctors are preferably magnetized in their plane.
  • the correctors should be sufficiently small. They may have, for example an elongate shape with a largest width of 5 mm and a largest length of 10 mm and placed in such a way that their short or long axis is directed towards the axis of the deflection unit.
  • Their (in-plane) direction of magnetization after positioning in the ring is advantageously directed tangentially. In that case it is possible to form 2 N poles along a circular circumference by means of N correctors.
  • the preformed elements used for the correctors may be standard-premagnetized with different values of the magnetic induction (strength). For example, a collection of preformed elements, the strongest of which is ten times as strong as the weakest, such as a collection whose strength varies in steps between roughly 1 and 10 times a given unit strength, or between roughly 1 and 20 (or 24) times a given unit strength.
  • the correctors from which a choice is made for positioning in the support have, for example 10 or 20 different strengths in the range between 5 and 500 ⁇ T, and more particularly in the range between 5 and 250 ⁇ T.
  • the correctors can be placed at the desired locations in the ring in a simple manner by means of an automatic positioning machine. It is then advantageous if the ring has a plurality of positioning projections or grooves in accordance with the number of correctors to be placed.
  • the colour display tube of Fig. 1 has a neck 1, a cone 2 and a display window 3 with an internal phosphor screen (display screen).
  • Current conductors 4 emerge from the neck 1.
  • a deflection unit 5 is arranged around the neck 1 and against the cone 2.
  • the deflection unit has a coil holder 6 of synthetic material, for example of polystyrene/polyphenylene oxide supporting deflection coils of the saddle type.
  • One deflection coil 7 for (field) deflection of electron beams is visible in this case.
  • a yoke ring 9 of a soft-magnetic material, for example nickel-zinc-ferrite or manganese-zinc-ferrite is arranged around the coils with which it cooperates. The ring 9 is secured to a front flange 8 of the coil holder 6.
  • Fig. 2 is a front elevation of the deflection unit 5 with the coil holder 6.
  • Coils 10a, 10b of the saddle type, intended for, for example line deflection of electron beams, are supported by the coil holder 6.
  • the coils 10a, 10b have parts which extend substantially in the longitudinal direction of the coil holder 6. These longitudinal parts are connected at their front and rear ends by means of transversal arcuate connection portions.
  • the flange 8 provided with an edge 9 at the wide end of the coil holder 6 provides the location for said arcuate connection portions.
  • the invention provides an annular (conical) support 13 (Fig. 3, 3A) in which, in the case shown, 24 compartments 12, ... are recessed every 15° in the inner surface.
  • Preformed, premagnitized elements 14, which have a length of approximately 6 to 7 mm, a width of approximately 5 mm and a thickness of less than about 1 mm are located in a plurality of the compartments.
  • the required field strength (increasing in, for example 10 or 20 steps from approximately 10 ⁇ T to approximately 250 ⁇ T) and the direction of magnetization of each magnet position is computed with reference to a test pattern on a display screen for each deflection unit or for each combination of deflection unit and display tube.
  • An embodiment of the support 13 was made of a synthetic material (such as nylon) having a wall thickness of 1 mm; magnetic preformed elements 14 having a thickness of 0.7 mm and comprising a mixture of 60% by volume of polyphenylene oxide/polystyrene and 40% by volume of permanent magnetic ferrite can be connected to the bottoms of the (0-7 mm deep) compartments 24 by means of glueing.
  • the elements 14 were magnetized to produce the desired field strengths at a distance of about 8.4 mm above their centre.
  • the ring may alternatively comprise a magnetic inert material which is different from synthetic material, such as glass or a ceramic material.
  • the provision of glue and the positioning of the preformed elements 14 can be realised, for example on an (adapted) S(urface) M(ounting) D(evice) machine.
  • a hot-melt process is suitable for glueing.
  • a ring 13 can be given a horizontal position in a positioning machine by means of a conveyor belt.
  • the ring 13 can then be tilted until a processing position has been reached (Fig. 4; Fig. 4A) so that a preformed element 14 can be placed in one position by means of a standard vertical positioning tool.
  • a processing position has been reached (Fig. 4; Fig. 4A)
  • a preformed element 14 can be placed in one position by means of a standard vertical positioning tool.
  • the ring 13 is advanced one position.
  • the position is accurately determined and fixed by making use of reference grooves 19 along the inner circumference of ring 13.
  • the positioning routine is repeated until the ring has been filled with the associated preformed elements.
  • Each type of preformed element can advantageously be packed in tape and fed to the positioning machine.
  • the ring 13 provided with at least two ears 16a, 16b is positioned at the inner side of the line deflection coils 10a, 10b (Fig. 5) at the wide end of the deflection unit 5.
  • the upper side of the ring 13 registers with the upper side of the deflection coils 10a, 10b.
  • the ring 13 has a shape which fits in with the shape of the deflection coils 10a, 10b.
  • the ears 16a, 16b are used for securing the ring 13 to the front flange 8 of coil holder 6.
  • the ears 16a, 16b may be secured to a fixation element 15, for example by means of a screw connection, a snap connection ( via a clamping fit) or by ultrasonic welding.
  • the ears 16a, 16b have grooves 17a, 17b of different dimensions so as to guarantee an unambiguous orientation.
  • Fig. 6 shows in a graph Q max (Q max represents the maximum convergence error measured in a series of 100 display tubes) and Q AV (which is a measure of the average weighted convergence error at a large number of measuring points, for example 25, distributed across the screen surface) in dependence upon the number N of correctors positioned at fixed locations in an annular support and on the basis of a measuring and computing program, selected from a collection of correctors having a strength increasing (in steps) from roughly 10 to 200 ⁇ T.
  • Q max represents the maximum convergence error measured in a series of 100 display tubes
  • Q AV which is a measure of the average weighted convergence error at a large number of measuring points, for example 25, distributed across the screen surface
  • Fig. 6 shows with reference to measurements relating to a colour monitor tube that for normal convergence requirements a minimum of 12 corrector locations was needed. For less stringent requirements a number of 8 locations might suffice. Above 36 corrector locations further improvements were found to be marginal.
  • a series of magnetized preformed elements having dimensions of 5 x 7 x 1 mm had the following values (in ⁇ T): 7.5-16.4-26.4-34.8-43.4-50.9-60.5-70.5-80.3-98.6-109.0-118.4-126.7-136.9-146.9-157.1-170.9-178.3-187.5-199.4 upon measurement by means of a Hall gauge and a Gauss meter.
  • annular support used in the invention and having predetermined locations for accommodating field correction elements may not only be used advantageously in deflection units for monochrome or colour display tubes but also in deflection units for electron microscopes, e-beam pattern generators and the like.
  • the collection of premagnetized preformed elements from which a selection is made may have a strength distribution linking up a minimum number of strengths with a maximum number of possibilities, for example a distribution of 1, 2, 5, 10, ..., a distribution of 1; 1.25; 2; 2.25; 2.75; 3.25; 4; 4.5; 5; 6, ..., a distribution similar to that of scale weights, etc. More particularly, a very large number of possibilities is created by stacking two or more preformed elements of the same or different strengths having parallel or antiparallel directions of magnetization.
  • Fig. 7 shows by way of example a front view of an annular support in which locations for accommodating correctors are provided on a plurality of radiuses (in this example 7 radiuses).
  • the spacings between the locations on a distinct radius is uniform, but in an alternative embodiment these spacings might be non-uniform.

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

Claims (9)

  1. Unité de déviation électromagnétique pour un tube à rayons cathodiques, comprenant un porte-bobines creux qui supporte un jeu de bobines pour dévier un faisceau d'électrons, lesdites bobines ayant des parties qui s'étendent sensiblement dans la direction longitudinale du porte-bobines sur son côté interne et des éléments de correction de champ sur le côté rentrant desdites bobines, l'unité de déviation comprenant en outre, agencé à l'intérieur du jeu de bobines, un support annulaire comprenant des emplacements prédéterminés pour recevoir des éléments de correction de champ, lesdits éléments de correction de champ étant reçus dans une pluralité desdits emplacements prédéterminés, caractérisée en ce que les éléments de correction de champ sont de type magnétique permanent.
  2. Unité de déviation selon la revendication 1, caractérisée en ce que les éléments de correction de champ produisent des champs ayant des intensités magnétiques dans la plage comprise entre 1 et 1000 µT.
  3. Unité de déviation selon la revendication 1 ou 2, caractérisée en ce que le support comprend au moins un jeu d'au moins 12 emplacements prédéterminés, lesdits emplacements prédéterminés étant régulièrement distribués sur un cercle.
  4. Unité de déviation selon la revendication 3, caractérisée en ce que le support comprend une pluralité de jeux concentriques d'emplacements prédéterminés.
  5. Unité de déviation selon la revendication 1, 2, 3 ou 4, caractérisée en ce que les éléments de correction de champ comprennent des éléments magnétisés préformés qui produisent des champs ayant des intensités magnétiques qui, tout en tenant compte d'une tolérance donnée, ont un nombre limité de valeurs fixes.
  6. Unité de déviation selon la revendication 1, 2, 3, 4 ou 5, caractérisée en ce que les parties de bobines s'étendant sensiblement dans la direction longitudinale du porte-bobines sont connectées, à leurs extrémités, par des parties de connexion transversales avant et arrière, et en ce que le support annulaire est agencé à un endroit contigu aux parties de connexion transversales avant des bobines de déviation.
  7. Unité de déviation selon l'une quelconque des revendications précédentes, caractérisée en ce que les éléments de correction de champ comprennent des éléments magnétisés préformés qui sont magnétisés dans leur plan.
  8. Unité de déviation selon la revendication 7, caractérisée en ce que les directions de magnétisation des éléments préformés sont dirigées tangentiellement par rapport à la circonférence du support annulaire.
  9. Tube image couleur pourvu d'une unité de déviation selon l'une quelconque des revendications précédentes.
EP19930203100 1992-11-12 1993-11-05 Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité Expired - Lifetime EP0597533B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19930203100 EP0597533B1 (fr) 1992-11-12 1993-11-05 Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92203476 1992-11-12
EP92203476 1992-11-12
EP19930203100 EP0597533B1 (fr) 1992-11-12 1993-11-05 Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité

Publications (2)

Publication Number Publication Date
EP0597533A1 EP0597533A1 (fr) 1994-05-18
EP0597533B1 true EP0597533B1 (fr) 1997-02-26

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EP19930203100 Expired - Lifetime EP0597533B1 (fr) 1992-11-12 1993-11-05 Unité de déviation muni d'un anneau avec des éléments de correction de champ, et un tube à rayons cathodiques comprenant ladite unité

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141154A (ja) * 1983-01-31 1984-08-13 Mitsubishi Electric Corp 受像管のミスコンバ−ゼンス補正方法
NL8303238A (nl) * 1983-09-21 1985-04-16 Philips Nv Elektromagnetische afbuigeenheid en kleurenbeeldbuis voorzien daarvan.

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EP0597533A1 (fr) 1994-05-18

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