EP0207849A1 - Magnetic deflection device for a cathode ray tube with a reduced neck length - Google Patents

Magnetic deflection device for a cathode ray tube with a reduced neck length Download PDF

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Publication number
EP0207849A1
EP0207849A1 EP86401385A EP86401385A EP0207849A1 EP 0207849 A1 EP0207849 A1 EP 0207849A1 EP 86401385 A EP86401385 A EP 86401385A EP 86401385 A EP86401385 A EP 86401385A EP 0207849 A1 EP0207849 A1 EP 0207849A1
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EP
European Patent Office
Prior art keywords
deflector
cathode ray
magnetic circuit
windings
ray tube
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Granted
Application number
EP86401385A
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German (de)
French (fr)
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EP0207849B1 (en
Inventor
Bruno C/O Thomson-Csf Scpi Roussel
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Videocolor SA
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Videocolor SA
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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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/762—Deflecting by magnetic fields only using saddle coils or printed windings

Definitions

  • the present invention relates to a magnetic divider for cathode ray tubes with reduced neck length.
  • the size of the cathode ray tube and its deflector can pose problems which are difficult to solve.
  • it has been thought to shorten the length of the neck but such a solution has so far been rejected, since this thus reduces the length of the space available for the deflector, which leads to either a notable decrease in the sensitivity of the deflector if the length is reduced, or disturbances, due to the magnetic fields created by a deflector of normal length, of the operation of the electron gun which is immersed in these fields, the disturbances affecting in particular the focusing lens.
  • the subject of the present invention is a deflector device which can be used on a cathode ray tube with a reduced neck length, causing practically no disturbance of the operation of the electron gun and practically optimal sensitivity.
  • the deflector according to the invention comprises a magnetic circuit closed at its rear part which envelops the rear buns of the coils of the deflector, the coils of these deflectors being of the so-called "saddle-saddle" type.
  • the known cathode ray tube 1 shown in FIG. 1 is of the "long neck" type, this neck 2 having a length such that the intensity of the magnetic field produced by the deflector 3 is practically zero at the level of the electron gun 4 of this tube, the deflector being positioned as far as possible from the electron gun, bearing on the conical part 5 of the tube.
  • the deflector 3 conventionally comprises a first winding 6 of horizontal deflection, and a second winding 7 of vertical deflection, both in the form of saddles.
  • the tube 8, shown in FIG. 2 is of the "short neck” type. Its neck 9 is significantly shorter than the neck 2 of the tube 1, which means that if the deflector 3 of the prior art were used, the electron gun 10 of this short neck tube would be in an area where the amplitude A of the magnetic field produced by the deflector is not negligible. Thus, the operation of the electron gun would be disturbed, as specified above.
  • a deflector according to the invention is used, such as the deflector 11 shown in FIG. 2.
  • the deflector 11 comprises a magnetic circuit 12, the front part of which (on the side of the conical part 13 of the tube) is flared in the same way as the front part of the conventional magnetic circuit.
  • the rear part of the magnetic circuit 12 is closed, that is to say that instead of forming a cylindrical sleeve, the end 12A of this rear part extends radially inwards (towards the longitudinal axis of the tube) practically to the point of the neck so as to form a "bottom" perpendicular to the axis of the tube and provided with an axial hole whose diameter is substantially equal to the outside diameter of the neck 9 of the cathode ray tube.
  • the deflector further comprises a winding 14 for horizontal deflection, and a winding 15 for vertical deflection, these two windings being arranged concentrically around the neck 9, the winding 14 for example inside the winding 15, the magnetic circuit 12 surrounding them .
  • the coil 14 which conforms most precisely to the shape of the tube (neck and start of the conical part 13) has a central part 16 and end buns 17 (at the front) and 18 (at the rear) .
  • the winding 15 comprises a central part 19 and end buns 20 (at the front ) and 21 (at the rear), the bun 21 being substantially in the extension of the central part 19 above the bun 18.
  • the windings 14 and 15 have practically the same shape saddle as the windings 6 and 7.
  • the magnetic circuit 12 which must follow the external contour of the winding 15, therefore comprises, for accommodating the buns 18 and 21, which are thicker than the central parts 16 and 19, a slight recess 22 , just in front of the end wall 12A.
  • the magnetic circuit 12 "envelops" the buns 18 and 21.
  • the focusing lens 13 is very close to the deflector. If a deflector such as the conventional deflector 3 of FIG. 1 were used, the amplitude of its magnetic field (solid line curve in FIG. 3) at the level of the lens 23 (zone 24 in FIG. 3) would be still high enough to deflect the electron beam produced by the gun, and therefore to offset it with respect to the lens 23, hence the appearance of spherical aberrations due to this lens at the focused spot. Indeed, at this lens 23, the electron beam of the barrel 10 is at its maximum diameter, and it is at a low potential compared to its final potential at the exit of the barrel; this beam is therefore very sensitive to magnetic fields ticks.
  • the magnetic circuit of which is made of a ferromagnetic material, for example numeral or ferrite, having a high permeability (much greater than 1) and a low time constant (approximately a few microseconds) in the establishment of the field, one obtains, behind the deflector, a very strong attenuation of its magnetic field, as illustrated by the curve in dashed line of figure 3.
  • the magnetic field becomes negligible (zone 24 in FIG. 3), the winding 17 being, in its front part, identical to the conventional winding 6.
  • the left part of the curve in broken lines merges with that of the curve in solid line. Similar curves would be obtained for the vertical deflection.

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Abstract

Le déviateur de l'invention comporte un circuit magnétique (12) enveloppant les chignons postérieurs (18, 21) des bobinages de déflexion, qui sont rabattus dans le prolongement des parties cen­trales de ces bobinages.The deflector of the invention comprises a magnetic circuit (12) enveloping the rear buns (18, 21) of the deflection windings, which are folded down in the extension of the central parts of these windings.

Application : visualisation de matériels embarqués.

Figure imgaf001
Application: visualization of on-board equipment.
Figure imgaf001

Description

La présente invention se rapporte à un diviateur magnétique pour tube à rayons cathodiques à longueur de col réduite.The present invention relates to a magnetic divider for cathode ray tubes with reduced neck length.

Dans le domaine de la visualisation professionnelle en parti­culier, notamment en avionique, l'encombrement du tube cathodique et de son déviateur peuvent poser des problèmes difficiles à résoudre. Pour réduire cet encombrement, à angle de déflexion constant, on a pensé raccourcir la longueur du col, mais une telle solution a jusqu'à présent été rejetée, car on réduit ainsi la longueur de l'emplacement disponible pour le déviateur, ce qui entraîne soit une baisse notable de la sensibilité du déviateur si on en diminue la longueur, soit des perturbations, dues aux champs magnétiques créés par un déviateur de longueur normale, du fonctionnement du canon à électrons qui se trouve plongé dans ces champs, les perturbations affectant notamment la lentille de focalisation.In the field of professional visualization in particular, especially in avionics, the size of the cathode ray tube and its deflector can pose problems which are difficult to solve. To reduce this space requirement, at constant deflection angle, it has been thought to shorten the length of the neck, but such a solution has so far been rejected, since this thus reduces the length of the space available for the deflector, which leads to either a notable decrease in the sensitivity of the deflector if the length is reduced, or disturbances, due to the magnetic fields created by a deflector of normal length, of the operation of the electron gun which is immersed in these fields, the disturbances affecting in particular the focusing lens.

La présente invention a pour objet un dispositif déviateur pouvant être utilisé sur un tube cathodique à longueur de col réduite, ne provoquant pratiquement aucune perturbation du fonc­tionnement du canon à électrons et de sensibilité pratiquement optimale.The subject of the present invention is a deflector device which can be used on a cathode ray tube with a reduced neck length, causing practically no disturbance of the operation of the electron gun and practically optimal sensitivity.

Le déviateur conforme à l'invention comporte un circuit magnétique fermé à sa partie postérieure qui enveloppe les chignons arrière des bobinages du déviateur, les bobinages des ces déviateurs étant du type dit "selle-selle".The deflector according to the invention comprises a magnetic circuit closed at its rear part which envelops the rear buns of the coils of the deflector, the coils of these deflectors being of the so-called "saddle-saddle" type.

La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation pris comme exemple non limitatif et illustré par le dessin annexé, sur lequel:

  • - la figure 1 est une vue schématique en coupe longitudinale d'un tube cathodique de l'art antérieur avec son déviateur classique;
  • - la figure 2 est une vue schématique en coupe longitudinale d'un tube cathodique à col raccourci, muni d'un déviateur conforme à l'invention, et
  • - la figure 3 est une courbe représentant l'amplitude du champ magnétique de déflexion horizontale le long de l'axe longitudinal du tube cathodique de la figure 1 et de la figure 2, dans la zone d'action du déviateur de l'invention.
The present invention will be better understood on reading the detailed description of an embodiment taken as a nonlimiting example and illustrated by the appended drawing, in which:
  • - Figure 1 is a schematic view in longitudinal section of a cathode ray tube of the prior art with its conventional deflector;
  • FIG. 2 is a schematic view in longitudinal section of a cathode ray tube with a shortened neck, provided with a deflector according to the invention, and
  • - Figure 3 is a curve representing the amplitude of the magnetic field of horizontal deflection along the longitudinal axis of the cathode ray tube of Figure 1 and Figure 2, in the area of action of the deflector of the invention.

Le tube cathodique connu 1 représenté sur la figure 1, est du type à "col long", ce col 2 ayant une longueur telle que l'intensité du champ magnétique produit par le déviateur 3 soit pratiquement nulle au niveau du canon à électrons 4 de ce tube, le déviateur étant positionné le plus loin possible du canon à électrons, en appui sur la partie conique 5 du tube. Le déviateur 3 comprend, de façon classique, un premier bobinage 6 de déviation horizontale, et un second bobinage 7 de déviation verticale, tous deux en forme de selle.The known cathode ray tube 1 shown in FIG. 1 is of the "long neck" type, this neck 2 having a length such that the intensity of the magnetic field produced by the deflector 3 is practically zero at the level of the electron gun 4 of this tube, the deflector being positioned as far as possible from the electron gun, bearing on the conical part 5 of the tube. The deflector 3 conventionally comprises a first winding 6 of horizontal deflection, and a second winding 7 of vertical deflection, both in the form of saddles.

Le tube 8, représenté sur la figure 2, est du type "à col court". Son col 9 est nettement plus court que le col 2 du tube 1, ce qui fait que si l'on utilisait le déviateur 3 de l'art antérieur, le canon à électrons 10 de ce tube à col court se trouverait dans une zone où l'amplitude A du champ magnétique produit par le déviateur n'est pas négligeable. Ainsi, le fonctionnement du canon à électrons serait perturbé, comme précisé ci-dessus.The tube 8, shown in FIG. 2, is of the "short neck" type. Its neck 9 is significantly shorter than the neck 2 of the tube 1, which means that if the deflector 3 of the prior art were used, the electron gun 10 of this short neck tube would be in an area where the amplitude A of the magnetic field produced by the deflector is not negligible. Thus, the operation of the electron gun would be disturbed, as specified above.

Pour réduire à une valeur négligeable l'amplitude du champ magnétique du déviateur au niveau du canon à élecrons 10, on utilise un déviateur conforme à l'invention, tel que le déviateur 11 repré­senté sur la figure 2.To reduce to a negligible value the amplitude of the magnetic field of the deflector at the level of the electron gun 10, a deflector according to the invention is used, such as the deflector 11 shown in FIG. 2.

Le déviateur 11 comporte un circuit magnétique 12 dont la partie antérieure (du côté de la partie conique 13 du tube) est évasée de la même façon que la partie antérieure du circuit magnétique classique. La partie postérieure du circuit magnétique 12 est fermée, c'est-à-dire qu'au lieu de former un manchon cylindrique, l'extrémité 12A de cette partie postérieure s'étend radialement vers l'intérieur (vers l'axe longitudinal du tube) prati­quement jusqu'au conctact du col de façon à former un "fond" perpendiculaire à l'axe du tube et pourvu d'un trou axial dont le diamètre est sensiblement égal au diamètre extérieur du col 9 du tube cathodique.The deflector 11 comprises a magnetic circuit 12, the front part of which (on the side of the conical part 13 of the tube) is flared in the same way as the front part of the conventional magnetic circuit. The rear part of the magnetic circuit 12 is closed, that is to say that instead of forming a cylindrical sleeve, the end 12A of this rear part extends radially inwards (towards the longitudinal axis of the tube) practically to the point of the neck so as to form a "bottom" perpendicular to the axis of the tube and provided with an axial hole whose diameter is substantially equal to the outside diameter of the neck 9 of the cathode ray tube.

Le déviateur comporte en outre un bobinage 14 de déflexion horizontale, et un bobinage 15 de déflexion verticale, ces deux bobinages étant disposés concentriquement autour du col 9, le bobi­nage 14 par exemple à l'intérieur du bobinage 15, le circuit magnétique 12 les entourant.The deflector further comprises a winding 14 for horizontal deflection, and a winding 15 for vertical deflection, these two windings being arranged concentrically around the neck 9, the winding 14 for example inside the winding 15, the magnetic circuit 12 surrounding them .

Le bobinage 14 qui épouse de façon la plus précise la forme du tube (col et début de la partie conique 13) comporte une partie centrale 16 et des chignons d'extrémité 17 (à l'avant) et 18 (à l'arrière). Le chignon 18, au lieu d'être rabattu radialement vers l'extérieur, est sensiblement dans le prolongement de la partie centrale 16. De même, le bobinage 15 comporte une partie centrale 19 et des chignons d'extrémité 20 (à l'avant) et 21 (à l'arrière), le chignon 21 étant sensiblement dans le prolongement de la partie centrale 19 au-dessus du chignon 18. A l'avant et dans leur partie centrale, les bobinages 14 et 15 ont pratiquement la même forme de selle que les bobinages 6 et 7. Le circuit magnétique 12, qui doit épouser le contour extérieur du bobinage 15, comporte donc pour loger les chignons 18 et 21, qui sont plus épais que les parties centrales 16 et 19, un léger chambrage 22, juste devant la paroi d'extrémité 12A. Ainsi, le circuit magnétique 12 "enveloppe" les chignons 18 et 21.The coil 14 which conforms most precisely to the shape of the tube (neck and start of the conical part 13) has a central part 16 and end buns 17 (at the front) and 18 (at the rear) . The bun 18, instead of being folded radially outward, is substantially in the extension of the central part 16. Similarly, the winding 15 comprises a central part 19 and end buns 20 (at the front ) and 21 (at the rear), the bun 21 being substantially in the extension of the central part 19 above the bun 18. At the front and in their central part, the windings 14 and 15 have practically the same shape saddle as the windings 6 and 7. The magnetic circuit 12, which must follow the external contour of the winding 15, therefore comprises, for accommodating the buns 18 and 21, which are thicker than the central parts 16 and 19, a slight recess 22 , just in front of the end wall 12A. Thus, the magnetic circuit 12 "envelops" the buns 18 and 21.

Dans le cas de l'utilisation d'un tube à col court tel que le tube 8, la lentille de focalisation 13 est très proche du déviateur. Si l'on utilisait un déviateur tel que le déviateur classique 3 de la figure 1, l'amplitude de son champ magnétique (courbe en trait plein de la figure 3) au niveau de la lentille 23 (zone 24 sur la figure 3) serait encore suffisamment élevée pour dévier le faisceau électronique produit par le canon, et donc de la désaxer par rapport à la lentille 23, d'où l'apparition d'aberrations sphériques dues à cette lentille au niveau du spot focalisé. En effet, au niveau de cette lentille 23, le faisceau électronique du canon 10 est à son diamètre maximal, et il est à un potentiel faible par rapport à son potentiel final à la sortie du canon ; ce faisceu est donc très sensible aux champs magné­ tiques.In the case of the use of a short neck tube such as the tube 8, the focusing lens 13 is very close to the deflector. If a deflector such as the conventional deflector 3 of FIG. 1 were used, the amplitude of its magnetic field (solid line curve in FIG. 3) at the level of the lens 23 (zone 24 in FIG. 3) would be still high enough to deflect the electron beam produced by the gun, and therefore to offset it with respect to the lens 23, hence the appearance of spherical aberrations due to this lens at the focused spot. Indeed, at this lens 23, the electron beam of the barrel 10 is at its maximum diameter, and it is at a low potential compared to its final potential at the exit of the barrel; this beam is therefore very sensitive to magnetic fields ticks.

En utilisant un déviateur conforme à l'invention dont le circuit magnétique est en un matériau ferromagnétique, par exemple du numétal ou de la ferrite, présentant une perméabilité élevée (très supérieure à 1) et une faible constante de temps (environ quelques microsecondes) dans l'établissement du champ, on obtient, derrière le déviateur, une très forte atténuation de son champ magnétique, comme illustré par la courbe en trait interrompu de la figure 3. Ainsi, au niveau de la lentille de focalisation, le champ magnétique devient négligeable (zone 24 sur la figure 3), le bobinage 17 étant, dans sa partie antérieure, identique au bobinage classique 6. La partie gauche de la courbe en trait interrompu se confond avec celle de la courbe en trait plein. On obtiendrait des courbes semblables pour la déflexion verticale.Using a deflector according to the invention, the magnetic circuit of which is made of a ferromagnetic material, for example numeral or ferrite, having a high permeability (much greater than 1) and a low time constant (approximately a few microseconds) in the establishment of the field, one obtains, behind the deflector, a very strong attenuation of its magnetic field, as illustrated by the curve in dashed line of figure 3. Thus, at the level of the focusing lens, the magnetic field becomes negligible (zone 24 in FIG. 3), the winding 17 being, in its front part, identical to the conventional winding 6. The left part of the curve in broken lines merges with that of the curve in solid line. Similar curves would be obtained for the vertical deflection.

Claims (6)

1. Déviateur magnétique pour tube à rayons cathodiques à longueur de col réduite, les bobinages de déflexion (15, 16) de ce déviateur étant du type selle-selle, caractérisé par le fait qu'il comporte un circuit magnétique (12) fermé à sa partie postérieure (12A), qui enveloppe les chignons arrière (18, 21) des bobinages (14, 15) du déviateur.1. Magnetic deflector for cathode ray tube with reduced neck length, the deflection coils (15, 16) of this deflector being of the saddle-saddle type, characterized in that it comprises a magnetic circuit (12) closed to its rear part (12A), which envelops the rear buns (18, 21) of the windings (14, 15) of the deflector. 2. Déviateur selon la revendication 1, caractérisé par le fait que l'extrémité (12A) de la partie postérieure du circuit magnétique s'étend radialement vers l'intérieur pratiquement jusqu'au contact du col (9).2. Diverter according to claim 1, characterized in that the end (12A) of the rear part of the magnetic circuit extends radially inwards practically until contact with the neck (9). 3. Déviateur selon la revendication 1 ou 2, caractérisé par le fait que les chignons postérieurs (18, 21) des bobinages s'étendent dans le prolongement des parties centrales (16, 19) de ces bobinages.3. Diverter according to claim 1 or 2, characterized in that the rear buns (18, 21) of the windings extend in the extension of the central parts (16, 19) of these windings. 4. Déviateur selon la revendication 3, caractérisé par le fait que les chignons postérieurs sont superposés.4. Diverter according to claim 3, characterized in that the rear buns are superimposed. 5. Déviateur selon l'une des revendications précédentes, carac­térisé par le fait que le circuit magnétique épouse le contour du bobinage extérieur, et qu'il comporte dans sa partie postérieure un chambrage (22) logeant les chignons postérieurs des bobinages.5. Diverter according to one of the preceding claims, characterized in that the magnetic circuit follows the contour of the external winding, and that it comprises in its rear part a recess (22) housing the rear buns of the windings. 6. Déviateur selon l'une des revendications précédentes, carac­térisé par le fait que le circuit magnétique est en matériau ferromagnétique à perméabilité magnétique élevée, tel que le mumétal ou la ferrite.6. Diverter according to one of the preceding claims, characterized in that the magnetic circuit is made of ferromagnetic material with high magnetic permeability, such as mumetal or ferrite.
EP86401385A 1985-06-27 1986-06-24 Magnetic deflection device for a cathode ray tube with a reduced neck length Expired - Lifetime EP0207849B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8509823 1985-06-27
FR8509823A FR2584233B1 (en) 1985-06-27 1985-06-27 MAGNETIC DEVIATOR FOR REDUCED NECK LENGTH CATHODE RAY TUBE

Publications (2)

Publication Number Publication Date
EP0207849A1 true EP0207849A1 (en) 1987-01-07
EP0207849B1 EP0207849B1 (en) 1990-08-01

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EP86401385A Expired - Lifetime EP0207849B1 (en) 1985-06-27 1986-06-24 Magnetic deflection device for a cathode ray tube with a reduced neck length

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US (1) US4700164A (en)
EP (1) EP0207849B1 (en)
DE (1) DE3673088D1 (en)
FR (1) FR2584233B1 (en)
HK (1) HK126895A (en)
IN (1) IN166686B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618253A1 (en) * 1987-07-17 1989-01-20 Videocolor MAGNETIC DEVICE FOR TRICHROME TUBE WITH SHIELD AND ADJUSTMENT METHOD.

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US3019361A (en) * 1957-11-15 1962-01-30 Philco Corp Laminated magnetic shielding means for television tubes and the like
US4369418A (en) * 1980-12-10 1983-01-18 Rca Corporation Deflection yoke incorporating a permeable corrector
US4409578A (en) * 1979-11-01 1983-10-11 U.S. Philips Corporation Color display tube comprising a deflection yoke and deflection yoke for a color display tube

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IT349671A (en) * 1936-02-28
US2845562A (en) * 1954-07-07 1958-07-29 Rca Corp Electromagnetic deflection yoke
NL153714B (en) * 1965-10-23 1977-06-15 Sanders Associates Inc CATHOD BEAM TUBE FITTED WITH A MAGNETIC DEFLECTION SYSTEM.
JPS601729A (en) * 1983-06-17 1985-01-07 Matsushita Electric Ind Co Ltd Deflecting yoke
JP2960888B2 (en) * 1996-06-17 1999-10-12 株式会社サンユー Wheelchair braking device

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Publication number Priority date Publication date Assignee Title
US3019361A (en) * 1957-11-15 1962-01-30 Philco Corp Laminated magnetic shielding means for television tubes and the like
US4409578A (en) * 1979-11-01 1983-10-11 U.S. Philips Corporation Color display tube comprising a deflection yoke and deflection yoke for a color display tube
US4369418A (en) * 1980-12-10 1983-01-18 Rca Corporation Deflection yoke incorporating a permeable corrector

Non-Patent Citations (1)

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Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 110 (E-314)[1833], 15 mai 1985; & JP-A-60 001 729 (MATSUSHITA DENKI SANGYO K.K.) 07-01-1985 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618253A1 (en) * 1987-07-17 1989-01-20 Videocolor MAGNETIC DEVICE FOR TRICHROME TUBE WITH SHIELD AND ADJUSTMENT METHOD.

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EP0207849B1 (en) 1990-08-01
DE3673088D1 (en) 1990-09-06
IN166686B (en) 1990-06-30
HK126895A (en) 1995-08-18
FR2584233B1 (en) 1987-08-07
US4700164A (en) 1987-10-13
FR2584233A1 (en) 1987-01-02

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