EP0266813B1 - Degaussing and earthing device for an image tube, and apparatus for manufacturing it - Google Patents

Degaussing and earthing device for an image tube, and apparatus for manufacturing it Download PDF

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Publication number
EP0266813B1
EP0266813B1 EP87201916A EP87201916A EP0266813B1 EP 0266813 B1 EP0266813 B1 EP 0266813B1 EP 87201916 A EP87201916 A EP 87201916A EP 87201916 A EP87201916 A EP 87201916A EP 0266813 B1 EP0266813 B1 EP 0266813B1
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EP
European Patent Office
Prior art keywords
strand
tube
conductor
winding
degaussing
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
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EP87201916A
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German (de)
French (fr)
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EP0266813A1 (en
Inventor
Patrick Société Civile S.P.I.D. Besnard
Jacques Société Civile S.P.I.D. Dupaillon
Georges Société Civile S.P.I.D. Prigent
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LA RADIOTECHNIQUE PORTENSEIGNE
Koninklijke Philips NV
Original Assignee
LA RADIOTECHNIQUE PORTENSEIGNE
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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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
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • 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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0046—Preventing or cancelling fields within the enclosure
    • H01J2229/0053—Demagnetisation

Definitions

  • the invention relates to a device for the demagnetization of a picture tube of a television receiver and for the earthing of a conductive coating applied to the cone of said tube, comprising a demagnetization coil consisting of a strand of wires. electrical insulated, held together and forming at least one loop applied to the cone of the tube, and an electrical conductor connected to ground and placed in electrical contact with said coating.
  • a device fulfilling this function and comprising the above elements is described, for example, in the German utility model no. 070 30 109.
  • the device described by this document uses a metal part in the shape of a spider, the legs of which are fixed. to slots in the image tube belt by means of hooks and laces, and are themselves provided with fingers ensuring the fixing of the demagnetization coil, as well as recesses making it possible to hang a conductive ribbon for setting the mass provided with a tension spring.
  • This device includes a mechanical support, the price of which is added to that of the coil and the grounding tape, and the assembly of the assembly requires a large number of operations: hooking the tabs and putting the laces in place. , then the reel, and finally the ribbon and its spring.
  • the invention proposes to provide an inexpensive device in itself, and the implementation of which is extremely simplified.
  • the device according to the invention is notably remarkable in that said grounding conductor surrounds the strand of the demagnetization winding.
  • this conductor does not require any particular fixing part, nor any specific mounting operation: it is found to be fixed at the same time as the coil.
  • the contact between this conductor and the coating is ensured along several distinct lines in different regions of the coating, which reduces its electrical resistance.
  • said conductor is advantageously a bare electric wire, wound in a spiral with the same pitch as the strip.
  • said conductor is advantageously constituted by said sheath itself, which is made conductive at least on the surface.
  • the device also has an indirect advantage.
  • the good insulation of the winding, connected to the sector, is of great importance and standards provide for the testing of this insulation.
  • an electrical contact surface must be provided around the strand; this is why this test could only be carried out in the prior art by taking samples, to the detriment of safety.
  • each winding is provided with a ground conductor which surrounds it and an insulation test on 100% of the parts is easy to carry out.
  • the fixing of the coil, that of the earthing conductor and also the earthing of the tube belt, in the case of a tube intended to be fixed by means of ears with which it is provided the strand of the winding provided with the grounding conductor advantageously passes in front of the ears and is fixed by this only means.
  • this has the advantage of ensuring the grounding of the tube anti-implosion belt without additional means.
  • said conductor can advantageously also be connected to one of the terminals of said connector.
  • the invention also relates to a machine for manufacturing a demagnetization device according to the invention, with which the strand of the demagnetization winding is wrapped, a machine provided with a rotary magazine for cutting a strip of plastic material and winding it around in a spiral. of the strand, which is advantageously provided with a second rotary magazine driven with the first for cutting and winding a bare conductive wire in order to wind during a single winding operation the conductive wire and the strip of plastic material .
  • the cathode ray tube, or picture tube, of FIG. 1 is covered with a conductive coating 7, in general a graphite coating, on the major part of its cone 6. It is equipped with an anti metallic belt -implosion 5 which carries ears 31, 32 for fixing the tube. It must also be fitted with a demagnetization coil; this winding comprises a plurality of turns of insulated electrical wires, constituting a strand of wires held together, and the whole resembles a sort of hose which is applied to the cone 6 of the tube so as to form at least one loop therein.
  • this hose 4 can be placed so as to form two loops, one of which is located on the upper half of the cone, and the other on the lower half, the neck 13 of the tube not being included in a loop.
  • the hose 4 can also be placed so as to form two loops, the neck of the tube being included in one of the two loops, which is larger than the other.
  • an electrical conductor here a bare electrical wire 1 connected to ground, is wound in a spiral around the strand of wires 4.
  • the belt 5 of the tube is here provided with ears 31 to 34 allowing the fixing of the tube in a cabinet or a frame.
  • the strand 4 provided with the grounding conductor 1 passes in front of the ear 31 (the word “in front” means: “on the side of the front face of the tube", that is to say behind the ear in the figure), follows the belt towards the ear 32 in front of which it passes, crosses diagonally the cone towards the ear 34, passes in front of the ear 34, runs along the belt and passes forward from the ear 33 then crosses again, diagonally, the cone passing under the neck 13 towards the ear 31 where we find the starting point of this description of the path of the strand.
  • the strand is fixed to the tube 6 by the mere fact that it passes in front of the ears.
  • a spring 8 (fig. 2A), pulling the two diagonal branches of the path towards each other, ensures a tension of the winding which it applies to the graphite cone, thus allowing electrical contact between the wire 4 wound in a spiral around the strand and the graphite coating of the tube.
  • Two collars 14 (fig. 2B) formed of a notched strap with irreversible tightening can also ensure the tension of the winding.
  • the winding is provided with a connector 2 to which the two ends of the insulated electrical wire which constitutes the winding are connected; it is interesting to take advantage of the presence of this connector to also connect the grounding conductor 1 to it, which provides a means of connecting this conductor to, for example, the mass of a chassis.
  • FIG. 3 represents a cut part of the strand of FIGS. 2.
  • the insulated conducting wires 12 are surrounded by a strip of plastic material 10, wound in a spiral around them and which holds them together.
  • the conductor 1 is a bare electrical wire, for example of tinned copper, which is wound in a spiral around the plastic strip 10.
  • this wire it is advantageous, to simplify the manufacture of the assembly, for this wire to be wound with the same step as strip 10.
  • FIG. 4 represents a part cut in another variant of a strand according to the invention: the strand of insulated conductive wire 12 is here surrounded by a sheath 9 which holds the strands of the strand together; this cylindrical plastic sheath can be welded at 11 along a generator, for example by means of ultrasonic welding.
  • this sheath is made of a material loaded with conductive particles or else it is metallized on the surface. It is connected to ground by any known means, for example by providing a ground wire 16 with an elastic clamp 15 (fig.2B) which clamps the strand at a point along its length, or else by connecting the spring 8 of Figure 2A to ground.
  • At least one means of connection with the mass of this kind is always necessary, even in the case where there is a wire 1 connected to the connector 2, since several masses must be joined to the coating of the cone and it is necessary that they be brought at different points. (Among other things, the mass of a "focus spark gap" located near the base of the image tube must not be connected to the same point of the sheath of the strand as the other masses).
  • FIGS. 5 and 6 A machine for wrapping a strand as shown in fig. 3 is itself shown diagrammatically in FIGS. 5 and 6.
  • a coil 17 delivers a ribbon 10 which is driven and guided by pulleys 18, then passes through an element 19 for measuring the length delivered and a system of section 20.
  • the ribbon is then brought to a rotary circular magazine 25 consisting of a wheel carrying near its rim a plurality of idler pulleys 41 to 48.
  • the winding strand 4 to be wrapped crosses the magazine in its center, parallel to the axis of rotation of the magazine, that is to say perpendicular to the paper which carries the figure.
  • Figure 6 shows with the same references as Figure 5 the elements in the region of the magazine 25, seen from the side, that is to say with the observer substantially in the plane of the wheel.
  • the dotted loop 39 indicates that the winding 4 is a ring which closes passing through the outside of the magazine 25.
  • the winding 4 is introduced into the magazine before starting the machine through a notch 24 in the magazine wheel, and it is tensioned so that it is firmly held in the center of the magazine 25.
  • a second magazine is added to this machine for cutting and winding a bare conducting wire, advantageously constituted here by a set of second idler pulleys placed on the same axes as the first. They are visible in Figure 6 where the references 41 to 48 of the pulleys of Figure 5 are split with an additional reference "A” or "B” (some of them only are shown so as not to overload the figure).
  • a coil 21 of wire 1 delivers the bare electric wire via guides 22 followed by a system similar to that intended for the ribbon where the references 23, 29, 30 correspond respectively to the references 18, 19, 20.
  • the references 1, 36, 37 of FIG. 6 correspond respectively for the wire to the references 10, 26, 27 for the plastic strip.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Elimination Of Static Electricity (AREA)
  • Insertion, Bundling And Securing Of Wires For Electric Apparatuses (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Description

L'invention concerne un dispositif pour la démagnétisation d'un tube-image de récepteur de télévision et pour la mise à la masse d'un revêtement conducteur appliqué sur le cône dudit tube, comportant un bobinage de démagnétisation constitué d'un toron de fils électriques isolés, maintenus ensemble et formant au moins une boucle appliquée sur le cône du tube, et un conducteur électrique relié à la masse et placé en contact électrique avec ledit revêtement.The invention relates to a device for the demagnetization of a picture tube of a television receiver and for the earthing of a conductive coating applied to the cone of said tube, comprising a demagnetization coil consisting of a strand of wires. electrical insulated, held together and forming at least one loop applied to the cone of the tube, and an electrical conductor connected to ground and placed in electrical contact with said coating.

Un dispositif remplissant cette fonction et comportant les éléments ci-dessus est décrit, par exemple, dans le modèle d'utilité allemand n 070 30 109. Le dispositif décrit par ce document utilise une pièce métallique en forme d'araignée dont les pattes sont fixées à des fentes de la ceinture du tube-image au moyen de crochets et de lacets, et sont elles-mêmes munies de doigts assurant la fixation de la bobine de démagnétisation, ainsi que d'évidements permettant d'accrocher un ruban conducteur de mise à la masse muni d'un ressort de tension.A device fulfilling this function and comprising the above elements is described, for example, in the German utility model no. 070 30 109. The device described by this document uses a metal part in the shape of a spider, the legs of which are fixed. to slots in the image tube belt by means of hooks and laces, and are themselves provided with fingers ensuring the fixing of the demagnetization coil, as well as recesses making it possible to hang a conductive ribbon for setting the mass provided with a tension spring.

Ce dispositif comporte un support mécanique dont le prix s'ajoute à celui de la bobine et du ruban de mise à la masse, et le montage de l'ensemble nécessite une nombreuse suite d'opérations : accrochage des pattes et mise en place des lacets, puis de la bobine, et enfin du ruban et de son ressort.This device includes a mechanical support, the price of which is added to that of the coil and the grounding tape, and the assembly of the assembly requires a large number of operations: hooking the tabs and putting the laces in place. , then the reel, and finally the ribbon and its spring.

L'invention se propose de fournir un dispositif peu coûteux en lui-même, et dont la mise en place soit extrêmement simplifiée. A cet effet, le dispositif, selon l'invention, est notamment remarquable en ce que ledit conducteur de mise à la masse entoure le toron du bobinage de démagnétisation. Ainsi, ce conducteur ne requiert aucune pièce de fixation particulière, ni aucune opération de montage spécifique : il se trou ve fixé en même temps que la bobine. En outre le contact entre ce conducteur et le revêtement est assuré le long de plusieurs lignes distinctes en différentes régions du revêtement, ce qui diminue sa résistance électrique.The invention proposes to provide an inexpensive device in itself, and the implementation of which is extremely simplified. To this end, the device according to the invention is notably remarkable in that said grounding conductor surrounds the strand of the demagnetization winding. Thus, this conductor does not require any particular fixing part, nor any specific mounting operation: it is found to be fixed at the same time as the coil. In addition, the contact between this conductor and the coating is ensured along several distinct lines in different regions of the coating, which reduces its electrical resistance.

Dans une variante préférée où les fils du toron sont maintenus ensemble par une bande de matière plastique enroulée en spirale autour d'eux, ledit conducteur est avantageusement un fil électrique nu, enroulé en spirale avec le même pas que la bande. Ainsi, il est possible de fabriquer le bobinage sans que l'ajout du conducteur ne requière d'opération supplémentaire, et le prix du fil électrique proprement dit est à peu près négligeable.In a preferred variant where the strand wires are held together by a strip of plastic material wound in a spiral around them, said conductor is advantageously a bare electric wire, wound in a spiral with the same pitch as the strip. Thus, it is possible to manufacture the winding without the addition of the conductor requiring any additional operation, and the price of the electric wire itself is almost negligible.

Dans une autre variante où les fils du toron sont maintenus ensemble par une gaine de matière plastique qui les entoure, ledit conducteur est avantageusement constitué par ladite gaine elle-même, qui est rendue conductrice au moins en surface.In another variant where the strand wires are held together by a plastic sheath which surrounds them, said conductor is advantageously constituted by said sheath itself, which is made conductive at least on the surface.

Le dispositif a en outre un avantage indirect. La bonne isolation du bobinage, relié au secteur, est d'une grande importance et des normes prévoient le test de cette isolation. Malheureusement, pour réaliser ce test, il faut fournir une surface de contact électrique autour du toron ; c'est pourquoi ce test ne pouvait être réalisé dans l'art antérieur que par prélèvement, au détriment de la sécurité. Avec le dispositif de l'invention, chaque bobinage est muni d'un conducteur de masse qui l'entoure et un test d'isolation sur 100% des pièces est facile à mettre en oeuvre.The device also has an indirect advantage. The good insulation of the winding, connected to the sector, is of great importance and standards provide for the testing of this insulation. Unfortunately, to perform this test, an electrical contact surface must be provided around the strand; this is why this test could only be carried out in the prior art by taking samples, to the detriment of safety. With the device of the invention, each winding is provided with a ground conductor which surrounds it and an insulation test on 100% of the parts is easy to carry out.

Pour assurer, sans matériel supplémentaire et en une seule opération, la fixation de la bobine, celle du conducteur de mise à la masse et également la mise à la masse de la ceinture du tube, dans le cas d'un tube destiné à être fixé au moyen d'oreilles dont il est muni, le toron du bobinage muni du conducteur de mise à la masse passe avantageusement en avant des oreilles et est fixé par ce seul moyen. En outre ceci offre l'avantage d'assurer sans moyens supplémentaires la mise à la masse de la ceinture an- ti-implosion de tube.To ensure, without additional equipment and in a single operation, the fixing of the coil, that of the earthing conductor and also the earthing of the tube belt, in the case of a tube intended to be fixed by means of ears with which it is provided, the strand of the winding provided with the grounding conductor advantageously passes in front of the ears and is fixed by this only means. In addition, this has the advantage of ensuring the grounding of the tube anti-implosion belt without additional means.

Lorsque le dispositif est muni d'un connecteur pour la connexion électrique de la bobine de démagnétisation, ledit conducteur peut avantageusement être aussi relié à une des bornes dudit connecteur.When the device is provided with a connector for the electrical connection of the demagnetization coil, said conductor can advantageously also be connected to one of the terminals of said connector.

L'invention concerne également une machine pour fabriquer un dispositif de démagnétisation selon l'invention, avec laquelle on enveloppe le toron du bobinage de démagnétisation, machine munie d'un magasin rotatif pour débiter une bande de matière plastique et l'enrouler en spirale autour du toron, qui est avantageusement munie d'un deuxième magasin rotatif entraîné avec le premier pour débiter et enrouler un fil conducteur nu afin d'enrouler au cours d'une seule et même opération d'enroulage le fil conducteur et la bande de matière plastique. Ainsi, seule une légère augmentation de l'investissement au niveau de la machine permet d'obtenir un moyen de mise à la masse quasi gratuit. On économise alors, pour chaque téléviseur construit, le prix d'une tresse de masse équipée d'un ressort spécifique, de ses moyens de fixation et de l'opération de fixation elle-même.The invention also relates to a machine for manufacturing a demagnetization device according to the invention, with which the strand of the demagnetization winding is wrapped, a machine provided with a rotary magazine for cutting a strip of plastic material and winding it around in a spiral. of the strand, which is advantageously provided with a second rotary magazine driven with the first for cutting and winding a bare conductive wire in order to wind during a single winding operation the conductive wire and the strip of plastic material . Thus, only a slight increase in investment in the machine makes it possible to obtain an almost free means of grounding. This saves, for each television set, the price of a ground braid equipped with a specific spring, its fixing means and the fixing operation itself.

La description qui va suivre, en regard des dessins annexés décrivant des exemples non limitatifs, fera bien comprendre comment l'invention peut être réalisée.

  • La figure 1 représente un tube image connu, vu de dessus.
  • Les figures 2A et 2B représentent un tube-image muni d'un dispositif selon l'invention, vu par l'arrière.
  • Les figures 3 et 4 représentent chacune une variante d'un toron du dispositif selon l'invention, dont elles montrent une portion coupée.
  • Les figures 5 et 6 représentent très schématiquement des parties en rapport avec l'invention d'une machine pour envelopper un toron de fils.
The description which follows, with reference to the appended drawings describing nonlimiting examples, will make it clear how the invention can be implemented.
  • Figure 1 shows a known picture tube, seen from above.
  • FIGS. 2A and 2B represent an image tube provided with a device according to the invention, seen from the rear.
  • Figures 3 and 4 each show a variant of a strand of the device according to the invention, of which they show a cut portion.
  • Figures 5 and 6 show very schematically parts related to the invention of a machine for wrapping a strand of son.

Le tube à rayons cathodiques, ou tube-image, de la figure 1, est recouvert d'un revêtement conducteur 7, en général un enduit au graphite, sur la majeure partie de son cône 6. Il est équipé d'une ceinture métallique anti-implosion 5 qui porte des oreilles 31, 32 pour la fixation du tube. Il doit être muni, en outre, d'un bobinage de démagnétisation ; ce bobinage comporte une pluralité de tours de fils électriques isolés, constituant un toron de fils maintenus ensemble, et le tout ressemble à une sorte de boyau qui est appliqué sur le cône 6 du tube de manère à y former au moins une boucle.The cathode ray tube, or picture tube, of FIG. 1, is covered with a conductive coating 7, in general a graphite coating, on the major part of its cone 6. It is equipped with an anti metallic belt -implosion 5 which carries ears 31, 32 for fixing the tube. It must also be fitted with a demagnetization coil; this winding comprises a plurality of turns of insulated electrical wires, constituting a strand of wires held together, and the whole resembles a sort of hose which is applied to the cone 6 of the tube so as to form at least one loop therein.

Comme le montre la figure 2A, ce boyau 4 peut être placé de manière à former deux boucles dont l'une est située sur la moitié supérieure du cône, et l'autre sur la moitié inférieure, le col 13 du tube n'étant pas inclus dans une boucle.As shown in FIG. 2A, this hose 4 can be placed so as to form two loops, one of which is located on the upper half of the cone, and the other on the lower half, the neck 13 of the tube not being included in a loop.

Comme le montre la figure 2B, le boyau 4 peut aussi être placé de manière à former deux boucles, le col du tube étant inclus dans une des deux boucles, qui est plus grande que l'autre.As shown in Figure 2B, the hose 4 can also be placed so as to form two loops, the neck of the tube being included in one of the two loops, which is larger than the other.

Par ailleurs, un conducteur électrique, ici un fil électrique nu 1 relié à la masse, est enroulé en spirale autour du toron de fils 4.Furthermore, an electrical conductor, here a bare electrical wire 1 connected to ground, is wound in a spiral around the strand of wires 4.

La ceinture 5 du tube est ici munie d'oreilles 31 à 34 permettant la fixation du tube dans une ébénisterie ou un châssis. Le toron 4, muni du conducteur de mise à la masse 1, passe en avant de l'oreille 31 (le mot "en avant" signifie : "du côté de la face avant du tube", c'est-à-dire derrière l'oreille sur la figure), suit la ceinture vers l'oreille 32 en avant de laquelle il passe, traverse en diagonale le cône vers l'oreille 34, passe en avant de l'oreille 34, longe la ceinture et passe en avant de l'oreille 33 puis traverse à nouveau, en diagonale, le cône en passant sous le col 13 vers l'oreille 31 où l'on retrouve le point de départ de cette description du trajet du toron. Ainsi, le toron est fixé au tube 6 par le seul fait qu'il passe en avant des oreilles. Un ressort 8 (fig. 2A), tirant l'une vers l'autre les deux branches diagonales du trajet, assure une tension du bobinage qu'il applique sur le cône graphité, permettant ainsi un contact électrique entre le fil 4 enroulé en spirale autour du toron et le revêtement graphité du tube. Deux colliers 14 (fig. 2B) formés d'une lanière crantée à serrage irréversible peuvent aussi assurer la tension du bobinage.The belt 5 of the tube is here provided with ears 31 to 34 allowing the fixing of the tube in a cabinet or a frame. The strand 4, provided with the grounding conductor 1, passes in front of the ear 31 (the word "in front" means: "on the side of the front face of the tube", that is to say behind the ear in the figure), follows the belt towards the ear 32 in front of which it passes, crosses diagonally the cone towards the ear 34, passes in front of the ear 34, runs along the belt and passes forward from the ear 33 then crosses again, diagonally, the cone passing under the neck 13 towards the ear 31 where we find the starting point of this description of the path of the strand. Thus, the strand is fixed to the tube 6 by the mere fact that it passes in front of the ears. A spring 8 (fig. 2A), pulling the two diagonal branches of the path towards each other, ensures a tension of the winding which it applies to the graphite cone, thus allowing electrical contact between the wire 4 wound in a spiral around the strand and the graphite coating of the tube. Two collars 14 (fig. 2B) formed of a notched strap with irreversible tightening can also ensure the tension of the winding.

Le bobinage est muni d'un connecteur 2 auquel sont reliées les deux extrémités du fil électrique isolé qui constitue le bobinage ; il est intéressant de profiter de la présence de ce connecteur pour y relier aussi le conducteur 1 de mise à la masse, ce qui fournit un moyen de relier ce conducteur à, par exemple, la masse d'un chassis.The winding is provided with a connector 2 to which the two ends of the insulated electrical wire which constitutes the winding are connected; it is interesting to take advantage of the presence of this connector to also connect the grounding conductor 1 to it, which provides a means of connecting this conductor to, for example, the mass of a chassis.

La figure 3 représente une partie coupée du toron des figures 2. Les fils conducteurs isolés 12 sont entourés d'une bande de matière plastique 10, enroulée en spirale autour d'eux et qui les maintient ensemble. Le conducteur 1 est un fil électrique nu, par exemple en cuivre étamé, qui est enroulé en spirale autour de la bande de plastique 10. En outre, il est avantageux, pour simplifier la fabrication de l'ensemble, que ce fil soit enroulé avec le même pas que la bande 10.FIG. 3 represents a cut part of the strand of FIGS. 2. The insulated conducting wires 12 are surrounded by a strip of plastic material 10, wound in a spiral around them and which holds them together. The conductor 1 is a bare electrical wire, for example of tinned copper, which is wound in a spiral around the plastic strip 10. In addition, it is advantageous, to simplify the manufacture of the assembly, for this wire to be wound with the same step as strip 10.

La figure 4 représente une partie coupée dans une autre variante d'un toron selon l'invention : le toron de fil conducteur isolé 12 est ici entouré d'une gaine 9 qui maintient les fils du toron ensemble ; cette gaine cylindrique en matière plastique peut être soudée en 11 le long d'une génératrice, par exemple au moyen d'un soudage à ultra-son. Selon l'invention, cette gaine est réalisée dans une matière chargée de particules conductrices ou bien elle est métallisée en surface. Elle est reliée à la masse par tout moyen connu, par exemple en munissant un fil de masse 16 d'une pince élastique 15 (fig.2B) qui serre le toron en un point de sa longueur, ou bien en reliant le ressort 8 de la figure 2A à la masse.FIG. 4 represents a part cut in another variant of a strand according to the invention: the strand of insulated conductive wire 12 is here surrounded by a sheath 9 which holds the strands of the strand together; this cylindrical plastic sheath can be welded at 11 along a generator, for example by means of ultrasonic welding. According to the invention, this sheath is made of a material loaded with conductive particles or else it is metallized on the surface. It is connected to ground by any known means, for example by providing a ground wire 16 with an elastic clamp 15 (fig.2B) which clamps the strand at a point along its length, or else by connecting the spring 8 of Figure 2A to ground.

Au moins un moyen de liaison avec la masse de ce genre reste toujours nécessaire, même dans le cas où il existe un fil 1 relié au connecteur 2, car plusieurs masses doivent être réunies au revêtement du cône et il est nécessaire qu'elles soient amenées en des points différents. (Entre autres la masse d'un "éclateur focus" situé près du culot du tube image ne doit pas être reliée au même point de la gaine du toron que les autres masses). On peut à cet effet imaginer aussi des colliers 14 métalliques et qui seraient munis de cosses pour y raccorder un fil de masse du genre du fil 16.At least one means of connection with the mass of this kind is always necessary, even in the case where there is a wire 1 connected to the connector 2, since several masses must be joined to the coating of the cone and it is necessary that they be brought at different points. (Among other things, the mass of a "focus spark gap" located near the base of the image tube must not be connected to the same point of the sheath of the strand as the other masses). One can for this purpose also imagine metal collars 14 and which would be provided with lugs for connecting a ground wire of the kind of wire 16.

Une machine pour envelopper un toron tel que représenté sur la fig. 3 est elle-même représentée schématiquement sur les figures 5 et 6. Sur la figure 5 une bobine 17 débite un ruban 10 qui est entraîné et guidé par des poulies 18, puis traverse un élément 19 de mesure de la longueur débitée et un système de coupe 20. Le ruban est ensuite amené sur un magasin circulaire rotatif 25 constitué d'une roue portant près de sa jante une pluralité de poulies folles 41 à 48.A machine for wrapping a strand as shown in fig. 3 is itself shown diagrammatically in FIGS. 5 and 6. In FIG. 5 a coil 17 delivers a ribbon 10 which is driven and guided by pulleys 18, then passes through an element 19 for measuring the length delivered and a system of section 20. The ribbon is then brought to a rotary circular magazine 25 consisting of a wheel carrying near its rim a plurality of idler pulleys 41 to 48.

Le toron de bobinage 4 à envelopper traverse le magasin en son centre, parallèlement à l'axe de rotation du magasin c'est à dire perpendiculairement au papier qui porte la figure.The winding strand 4 to be wrapped crosses the magazine in its center, parallel to the axis of rotation of the magazine, that is to say perpendicular to the paper which carries the figure.

La figure 6 représente avec les mêmes références que la figure 5 les éléments dans la région du magasin 25, vus de côté, c'est-à-dire avec l'observateur sensiblement dans le plan de la roue. La boucle en pointillé 39 indique que le bobinage 4 est un anneau qui se referme en passant par l'extérieur du magasin 25. Le bobinage 4 est introduit dans le magasin avant la mise en route de la machine en passant par une échancrure 24 dans la roue du magasin, et il est tendu de manière à être fermement maintenu au centre du magasin 25.Figure 6 shows with the same references as Figure 5 the elements in the region of the magazine 25, seen from the side, that is to say with the observer substantially in the plane of the wheel. The dotted loop 39 indicates that the winding 4 is a ring which closes passing through the outside of the magazine 25. The winding 4 is introduced into the magazine before starting the machine through a notch 24 in the magazine wheel, and it is tensioned so that it is firmly held in the center of the magazine 25.

Pour commencer le bobinage on amène, par exemple à la main, l'amorce de bande plastique sur le toron du bobinage 4 et on l'y fixe par exemple au moyen d'un ruban adhésif. On fait alors tourner le magasin 25 dans le sens de la flèche 38 ce qui enroule simultanément le ruban autour du bobinage en 27 et emmagasine du ruban sur les poulies folles comme indiqué par 26. Un système de pince 40 assure la tension du ruban. Le bobinage 4 est avancé en synchronisme dans une direction indiquée par la flèche 35 de la figure 6 ce qui provoque un enroulement en spirale. Bien entendu la longueur de ruban utilisé à chaque tour autour du bobinage 4 est beaucoup moins longue que celle enroulée en 26 étant donné le rapport des diamètres. On doit donc couper le ruban avec le système de coupe 20, lorsque la longueur nécessaire pour envelopper tout le bobinage 4 a été mesurée par le susdit élément de mesure 19. Alors le magasin continue à tourner et les poulies folles tournent sur elles-même (ici dans le sens inverse des aiguilles d'une montre) pour permettre une avance du ruban par rapport à la roue 25.To start the winding, we bring, for example by hand, the primer of plastic tape on the strand of the winding 4 and we fix it for example by means of an adhesive tape. The magazine 25 is then rotated in the direction of the arrow 38 which simultaneously wraps the ribbon around the winding at 27 and stores ribbon on the idler pulleys as indicated by 26. A clamp system 40 ensures the tension of the ribbon. The winding 4 is advanced in synchronism in a direction indicated by the arrow 35 in Figure 6 which causes a spiral winding. Of course the length of ribbon used at each turn around the winding 4 is much shorter than that wound at 26 given the ratio of diameters. We must therefore cut the tape with the cutting system 20, when the length necessary to wrap all the winding 4 has been measured by the aforementioned measuring element 19. Then the magazine continues to rotate and the idler pulleys rotate on themselves ( here counterclockwise) to allow the ribbon to advance relative to the wheel 25.

La machine telle que décrite jusqu'ici est connue et disponible dans le commerce et ne nécessite donc pas plus d'explication. En particulier les supports et moteurs divers faisant appel à des solutions mécaniques banales ne sont pas représentés.The machine as described so far is known and available commercially and therefore does not require further explanation. In particular the various supports and motors using common mechanical solutions are not shown.

Selon l'invention on adjoint à cette machine un deuxième magasin pour débiter et enrouler un fil conducteur nu, constitué avantageusement ici par un jeu de deuxièmes poulies folles placées sur les mêmes axes que les premières. Elles sont visibles sur la figure 6 où les références 41 à 48 des poulies de la figure 5 sont dédoublées avec une référence additionnelle "A" ou "B" (certaines d'entre elles seulement sont représentées afin de ne pas surcharger la figure).According to the invention, a second magazine is added to this machine for cutting and winding a bare conducting wire, advantageously constituted here by a set of second idler pulleys placed on the same axes as the first. They are visible in Figure 6 where the references 41 to 48 of the pulleys of Figure 5 are split with an additional reference "A" or "B" (some of them only are shown so as not to overload the figure).

Les poulies référencées "A" correspondent à l'art antérieur et supporte le ruban plasltique, celles référencées "B" constituent le deuxième magasin.The pulleys referenced "A" correspond to the prior art and support the plastic tape, those referenced "B" constitute the second magazine.

Une bobine 21 de fil 1 débite le fil électrique nu via des guides 22 suivis d'un système analogue à celui destiné au ruban où les références 23, 29, 30 correspondent respectivement aux références 18, 19, 20.A coil 21 of wire 1 delivers the bare electric wire via guides 22 followed by a system similar to that intended for the ribbon where the references 23, 29, 30 correspond respectively to the references 18, 19, 20.

Ainsi le fil 1 et la bande 10 sont enroulés au cours d'une seule et même opération d'enroulage.Thus the wire 1 and the strip 10 are wound in a single winding operation.

Les références 1, 36, 37 de la figure 6 correspondent respectivement pour le fil aux références 10, 26, 27 pour la bande plastique.The references 1, 36, 37 of FIG. 6 correspond respectively for the wire to the references 10, 26, 27 for the plastic strip.

Au début de l'enroulage, on réalise quelques tours avec le ruban et on fixe le fil sur le toron de bobinage 4 seulement alors. Cette manière de faire permet que le fil ne soit pas recouvert par la spire de ruban suivante.At the start of winding, a few turns are made with the ribbon and the wire is fixed to the winding strand 4 only then. This way of doing things ensures that the wire is not covered by the next turn of ribbon.

Claims (6)

1. A device for degaussing a picture tube of a television receiver and for earthing a conductive coating (7) applied to the cone (6) of said tube, comprising a degaussing coil system constituted by a strand (4) of insulated electric wires (12) held together and forming at least one loop applied to the cone of the tube as well as an electrical conductor (1, 9) connected to earth and arranged so as to be in electrical contact with said coating, characterized in that said conductor (1, 9) encloses the strand (4) of the degaussing coil system.
2. A device as claimed in Claim 1, in which the wires (12) of the strand (4) are held together by a sheath (9) of a plastic material enclosing them, characterized in that said conductor is constituted by said sheath itself, which sheath is made conductive at least at the surface.
3. A device as claimed in Claim 1, in which the wires (12) of the strand (4) are held together by a tape (10) of plastic material wound helically around them, characterized in that said conductor is a bare electric wire (1) wound helically with the same pitch as the tape (10).
4. A device as claimed in Claim 1 for a tube intended to be fixed by means of ears (31-34) with which it is provided, characterized in that the strand provided with the earthing conductor is fixed to the tube solely by the fact that it passes in front of the ears.
5. A device as claimed in Claim 3, provided with a connector (2) for the electrical connection of the degaussing coil, characterized in that the bare electric wire (1) is also connected to one of the terminals of the connector (2).
6. A machine for manufacturing a degaussing device as claimed in Claim 3, by means of which the strand (4) of the degaussing coil system is enveloped, said machine being provided with a rotatable magazine (25; 41A-48A) for supplying a tape (10) of plastic material and winding it helically around the strand, characterized in that it is provided with a second rotatable magazine (41B-48B), driven along with the first magazine, for supplying and winding a bare conductive wire (1) in order to wind the conductive wire and the tape of plastic material in one and the same winding operation.
EP87201916A 1986-10-10 1987-10-07 Degaussing and earthing device for an image tube, and apparatus for manufacturing it Expired - Lifetime EP0266813B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8614125 1986-10-10
FR8614125A FR2605169B1 (en) 1986-10-10 1986-10-10 DEMAGNETIZATION AND EARTHING DEVICE FOR AN IMAGE TUBE, AND MACHINE FOR MAKING SAME

Publications (2)

Publication Number Publication Date
EP0266813A1 EP0266813A1 (en) 1988-05-11
EP0266813B1 true EP0266813B1 (en) 1990-09-19

Family

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Application Number Title Priority Date Filing Date
EP87201916A Expired - Lifetime EP0266813B1 (en) 1986-10-10 1987-10-07 Degaussing and earthing device for an image tube, and apparatus for manufacturing it

Country Status (8)

Country Link
US (1) US4812946A (en)
EP (1) EP0266813B1 (en)
JP (1) JPS63107387A (en)
CN (1) CN1017107B (en)
AU (1) AU603962B2 (en)
DE (1) DE3765086D1 (en)
ES (1) ES2018536B3 (en)
FR (1) FR2605169B1 (en)

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US4916358A (en) * 1988-10-25 1990-04-10 Rca Licensing Corporation Kinescope grounding system
NL9002618A (en) * 1990-11-30 1992-06-16 Philips Nv DEVICE FOR DEMAGNETIZING A PICTURE TUBE.
CN1040934C (en) * 1991-07-18 1998-11-25 东芝株式会社 Cathode ray tube device and cathode ray tube image display apparatus
US5216326A (en) * 1991-10-31 1993-06-01 Apple Computer, Inc. Injection molded printed circuit degauss coil
JPH05300530A (en) * 1992-04-20 1993-11-12 Mitsubishi Electric Corp Shielding mechanism for image display device
US5416595A (en) * 1993-04-29 1995-05-16 Sony Electronics Inc. Methods and apparatus for securing a degaussing coil
DE4441013C2 (en) * 1994-11-17 2000-04-13 Loewe Opta Gmbh Device for establishing a ground connection with the aquadation of a picture tube
KR0155892B1 (en) * 1995-09-30 1998-10-15 김광호 Degaussing coil fixation structure of cathode ray tube
ES2108648B1 (en) * 1996-01-11 1998-07-01 Arnaiz Alfredo Alarcia DEMAGNETIZATION AND GROUND CONNECTION DEVICE FOR COLORED CATHODIC RAY TUBES.
KR100265172B1 (en) * 1996-02-24 2000-09-15 윤종용 The degaussing coil fixing apparatus of monitor
KR100225045B1 (en) * 1996-05-13 1999-10-15 구자홍 Electromagnetic field radiation noise shielding device of cathode ray tube panel
DE19647120C1 (en) * 1996-11-14 1998-05-07 Kunststoff Spritzgusteile Gerh Holder for demagnetizing coils of picture tubes
JPH11127446A (en) * 1997-10-24 1999-05-11 Matsushita Electric Ind Co Ltd Geomagnetic correction device and television receiver

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JPS551786A (en) * 1978-06-19 1980-01-08 Sanyo Electric Co Ltd Demagnetizing coil for color television receiver
DE3009458A1 (en) * 1980-03-12 1981-09-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt CATHODE RAY TUBE
US4441052A (en) * 1982-11-26 1984-04-03 Rca Corporation Degaussing circuit for television receiver having switched mode power supply
JPS60106286A (en) * 1983-11-14 1985-06-11 Matsushita Electric Ind Co Ltd Video tube device
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DE3534150A1 (en) * 1985-09-25 1987-04-02 Newek Neue Elektronik Werke Gm Colour picture tube having a demagnetising coil
US4700260A (en) * 1986-05-30 1987-10-13 Rca Corporation Degaussing coil and ground strap mounting arrangement

Also Published As

Publication number Publication date
JPS63107387A (en) 1988-05-12
FR2605169A1 (en) 1988-04-15
US4812946A (en) 1989-03-14
EP0266813A1 (en) 1988-05-11
CN1017107B (en) 1992-06-17
CN87106861A (en) 1988-04-20
ES2018536B3 (en) 1991-04-16
DE3765086D1 (en) 1990-10-25
AU603962B2 (en) 1990-11-29
FR2605169B1 (en) 1988-12-09
AU7942987A (en) 1988-04-14

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