EP0456224B1 - Dispositif de tube à rayons cathodiques en couleurs - Google Patents

Dispositif de tube à rayons cathodiques en couleurs Download PDF

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Publication number
EP0456224B1
EP0456224B1 EP19910107505 EP91107505A EP0456224B1 EP 0456224 B1 EP0456224 B1 EP 0456224B1 EP 19910107505 EP19910107505 EP 19910107505 EP 91107505 A EP91107505 A EP 91107505A EP 0456224 B1 EP0456224 B1 EP 0456224B1
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EP
European Patent Office
Prior art keywords
electron
permanent magnet
deflection device
axis
magnetic
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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EP19910107505
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German (de)
English (en)
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EP0456224A3 (en
EP0456224A2 (fr
Inventor
Masatsugu C/O Intellectual Property Div. Inoue
Kiyoshi C/O Intellectual Property Div. Tokita
Takeshi C/O Intellectual Property Div. Fujiwara
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Toshiba Corp
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Toshiba Corp
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Publication of EP0456224A2 publication Critical patent/EP0456224A2/fr
Publication of EP0456224A3 publication Critical patent/EP0456224A3/en
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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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • H01J29/566—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses for correcting aberration
    • 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
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices

Definitions

  • the present invention relates to a deflection device for a color cathode ray tube apparatus featuring improved focus characteristic by effect of minimized deflection aberration.
  • a color cathode ray tube apparatus of shadow mask type comprises a panel section having a generally rectangular face plate and a skirt extending from a lateral edge of the face plate, a funnel section connected to the panel section, and a neck section continuously formed with the funnel section.
  • the interior of the cathode ray tube is maintained in a vacuum state by the panel section, the funnel section and the neck section.
  • an electron gun assembly which generates three electron beams (R), (G) and (B).
  • R electron beams
  • G electron beams
  • B electron beams
  • a deflection device At the outer lateral side of the portion of the apparatus between the funnel section and the neck section is disposed a deflection device for generating magnetic fields which deflect electron beams vertically and horizontally.
  • a phosphor screen is formed on the inner face of the face plate of the panel.
  • a generally rectangular shadow mask is opposed to the face plate at a predetermined spacing.
  • the shadow mask is made of a thin metal plate and provided with a lot
  • the deflection device for use in the color cathode ray tube apparatus of shadow mask type has a horizontal deflection coil and a vertical deflection coil which produce magnetic fields for respectively horizontally and vertically deflecting the three electron beams (R), (G), (B) emitted from the electron gun assembly. After being deflected by the horizontal and vertical deflection coils, the three electron beams (R), (G) and (B) are converged towards the corresponding slit. The electron beams (R), (G) and (B) converged at the vicinity of the slit are landed on the phosphor screen which has three kinds of phosphor stripes alternately arranged to each other.
  • the three electron beams (R), (G) and (B) pass the slit and are incident on the phosphor screen, thereby the red light, green light and blue light are emitted from the phosphor stripes. In other words, the three beams are landed on the corresponding phosphor stripes which emit the red, green and blue light.
  • the electron beam (G) which causes green light to be emitted is radiated from the electron gun so as to coincide with the tube axis.
  • the electron beams (B) and (R) which cause blue light and red light to be emitted, respectively, are radiated, with the electron beam (G) disposed therebetween.
  • the color cathode ray tube apparatus which employs the characteristic of the inline type electron gun to produce specific non-uniform magnetic fields by means of deflection yokes, is a self-convergence type color cathode ray tube apparatus.
  • a horizontal deflection magnetic field of mainly pincushion type and a vertical deflection magnetic field of mainly barrel type are applied.
  • the impression of these magnetic fields enables the three electron beams radiated on the same horizontal plane to be converged on the phosphor screen.
  • Sho 57-45748 discloses another apparatus in which an auxiliary coil is provided at the side of the electron gun of a deflection device and is adapted to render an electrical current to flow in synchronism with the deflection current flowing in a vertical deflection coil, thereby generating a strong pincushion type magnetic field.
  • Fig. 1 designates this condition. If these three electron beams where subject to deflection by effect of uniform magnetic filed, the shape of beam spots of these three electron beams remains circular all over the fluorescent surface. On the other hand, as shown in Fig.
  • the beam-spot shapes 13b and 13r of a pair of side beams B and R among those three electron beams distort themselves into an elliptical form which extends itself in the about 90°-inclined direction to intersect with each other.
  • the shape of beam spot of the center beams G among those three electron beams distorts itself into horizontally extended elliptical form on receipt of the Lorentz's force.
  • focus characteristics in the periphery of the fluorescent surface is significantly degraded.
  • manufacturers are obliged to design the color cathode ray tube apparatus to level off the focus characteristic of the whole fluorescent surface even though satisfactory focus characteristic may be sacrificed in the center region of the fluorescent surface.
  • auxiliary coil contains a coil wound on a magnetic member in order to allow current to flow through the coil, considering the nature of being an auxiliary element, it is by no means economical to use.
  • impedance of the deflection device is often variable. If the impedance of the deflection device were changed, then, current flowing through the deflection coil fluctuates. As a result, in order to offset influence of the auxiliary coil affecting the deflection device, it is essential for the TV manufacturers to change specification of the auxiliary coil in correspondence with the impedance of the deflection coil, and thus, the color cathode ray tube using the above auxiliary coil involves poor compatibility with the mass production.
  • Those permanent magnets 10a and 10b are disposed on the axis X orthogonally intersecting the aligned direction of three electron beams, where these permanent magnets 10a and 10b respectively generate pin-cushion type magnetic filed.
  • the pin-cushion type magnetic field generates specific Lorentz's force which compensates for the deformation of the beam spot shape of three electron beams caused by the other Lorentz's force of the barrel-type deflection magnetic filed generated by the second deflection coil.
  • the other pair of permanent magnetic 10c and 10d are respectively disposed on the axis X which is in parallel with the aligned direction of these three electron beams, where these permanent magnets 10c and 10d respectively generate specific Lorentz's force inverse from the other Lorentz's force of the barrel-type deflection magnetic filed generated by the second deflection coil.
  • this inverse Lorentz's force independent of influence of the barrel-type deflection magnetic filed generated by the second deflection coil 4, a pair of side beams B and R can be prevented from deforming themseleves in the oblique direction.
  • Prior art document EP-A-59 004 discloses a picture display device having a display tube and a self-converging system of deflection coils. In this display device, focusing is substantially independent of the deflection by the system of the deflection coils and takes place by means of two quadrupole lenses and a focusing lens. Also an eight-pole magnetic lens can be used.
  • prior art document EP-A-53 853 describes a cathode-ray tube and a deflection unit.
  • this cathode-ray tube an eight-pole magnetic field is generated in a region closer to the screen than the center of the deflection yoke.
  • the object of the invention is to fully solve the technical problems as mentioned above by providing a novel deflection device capable of securely providing satisfactory focus characteristics throughout the whole screen surface without degrading the convergence characteristics at all.
  • the present invention provides a deflection device as specified in claim 1 or 8.
  • the deflection device embodied by the invention characteristically incorporates a single unit of eight-pole permanent magnet disc capable of precisely positioning a plurality of magnetic poles between the end of the deflection device on the side of the electron gun and the electron gun itself.
  • Fig. 6 is a sectional view of the color cathode ray tube apparatus according to the first embodiment of the invention.
  • the color cathode ray tube apparatus 50 incorporates the following; a panel section 52 which is internally provided with a substantially rectangular face plate 54 and a skirt 51 which extends itself from the side edge of the face plate 54, a funnel section 58 which is connected to the panel section 52, and an envelope member 61 which envelopes a neck section 60 connected to the funnel section 58.
  • the panel section 52, the funnel section 58, and the neck section 60 conjunctionally hold the interior of the color cathode ray tube in perfect vacuum.
  • the neck section 60 incorporates an electron-gun assembly 62 which generates three electron beams R, G, and B.
  • a deflection device 64 is provided with a pair of horizontal deflection coils 80 generating specific magnetic field which deflects those three electron beams R, G, and B in the horizontal direction and a pair of vertical deflection coils 82 generating specific magnetic field which deflects those three electron beams R, G, and B in the vertical direction.
  • the deflection device 64 is secured to the external surface of the funnel section 58 and the neck section 60.
  • a ring-shaped permanent magnet 70 incorporating eight magnetic poles is secured to the deflection device 64 at the position close to the electron-gun assembly 62.
  • a phosphor screen 74 is provided on the inner surface of the face plate 54 of the panel section 52.
  • Shadow mask 76 of substantially rectangular shape is disposed inside of the color cathode ray tube in opposition from the phosphor screen 74 at the predetermined intervals.
  • the shadow mask 76 is made of extremely thin metallic sheets and provided with a large number of through holes.
  • a mask frame 78 is provided in the periphery of these shadow masks 76 in order to support them.
  • the mask frame 78 is secured to the panel section 52 by means of a plurality of elastic supporters (not shown).
  • Fig. 7 is an enlarged perspective view of the deflection device 64, which incorporates a pair of saddle-type horizontal deflection coils 80 symmetrically being disposed in the vertical (Y-axial) direction of a separator 83 and a pair of troidal-type vertical deflection coils 82 wound on a core 84, respectively. Synchronized currents each having a different value compatible with those deflection coils 80 and 83 are respectively delivered to passive circuits (not shown) which incorporates those elements like resistors and line concentrators.
  • the ring-shaped permanent magnet 70 secured to the deflection device 64 on the side of the electron-gun assembly 62 is integrally provided with eight magnetic poles in the periphery of the tubular axis Z.
  • those eight magnetic poles provided for the permanent magnet 70 are alternately disposed.
  • the intervals provided between these magnetic poles which are disposed at specific positions close to both sides of the axes X and Y are substantially narrower than those intervals between those magnetic poles which are apart from those axes X and Y.
  • those two pairs of magnetic poles in other words, four magnetic poles, which are disposed at specific positions close to both sides of the axis X respectively contain magnetic force being equal to each other.
  • those two pairs of magnetic poles (i.e., four magnetic poles) which are disposed at specific positions close to both sides of the axis Y also contain magnetic force being equal to each other.
  • those two pairs of magnetic poles i.e., four magnetic poles
  • those two pairs of magnetic poles which are disposed at those positions close to both sides of the axis X respectively contain such magnetic force weaker than that is held by those two pairs (i.e., four magnetic poles) of magnetic poles disposed at those positions close to both sides of the axis Y.
  • these magnetic poles alternately invert themselves clockwise based on the N-pole which is made of the magnetic pole closest to the axis Y in the first quadrant at the upper right position.
  • the permanent magnet ring 70 has 30 mm of inner diameter, 33 mm of outer diameter, 5 mm of width, 6 mm of intervals La between those magnetic poles intersecting the axis Y, 5 mm of intervals Lb between those magnetic poles intersecting the axis x, and 26.5 mm of intervals La between those magnetic poles which do not intersect normal axis, respectively.
  • This embodiment provides 1.300 Gauss per centimeter of superficial flux density for those magnetic pole intersecting the axis X, and provides 1,500 Gauss per centimeter of the superficial density for those magnetic poles intersecting the axis Y, respectively.
  • Fig. 18 shows magnetizing method of the permanent magnet having eight magnetic poles.
  • a magnetizing apparatus having eight cores 202 and eight coils 203 is arranged around a ring-shaped magnetic material 204. Electric current is provided for coils 203, so that eight magnetic poles are formed on magnetic material 204.
  • eight cores 202 is correctly positioned on magnetizing apparatus, eight magnetic poles are formed on magnetic material 204 correctly.
  • the strength of magnetic filed can be changed by current strength and winding times of the coil.
  • magnetizing apparatus can be positioned on inside of ring-shaped magnetic material 204.
  • the electron gun assembly 62 of the color cathode ray tube apparatus embodied by the invention incorporates the following; three units of independent cathodes 130 which are aligned on a rank in horizontal direction, an electron beam generator GE consisting of the first and second grids 131 and 132 which respectively control electrons emitted from those independent cathodes 130, and an electron lens section consisting of the third through sixth grids 133 through 136 which respectively accelerate and focus those three electron beams R, G, and B, emitted from the electron beam generator GE.
  • a convergence cup 137 is provided for the sixth grid 136.
  • a heater 138 is provided in order to heat those three independent cathodes 130.
  • Those first, second and the fourth grids 131, 132, and 134 are substantially plate-like electrodes which are respectively provided with three through-holes allowing permeation of electron beams emitted from those three independent cathodes 130.
  • the third, fifth, and the sixth grids 133, 135, and 136 are respectively the integrally structured cylindrical electrodes which are respectively provided with three through holes to allow permeation of electron beams emitted from those three independent cathodes 130.
  • the intervals between those through holes allowing permeation of a pair of side electron beams concretely, those intervals Sg between the aligned direction of a pair of side electron beams passing through the main lens section are adjusted to about 6.6 mm.
  • a magnetic field control element consisting of those magnetic members 141a and 141b affecting each other between the magnetic field leaked from the rear region of the deflection device is provided in the periphery of the side-beam permeating holes at the bottom of the convergence cup 137. The magnetic field control element compensates for the coma aberration.
  • a pair of vertical deflection coils 82 respectively generate extremely intense barrel-like vertical deflection magnetic field 150.
  • extremely intense Lorentz's force affects electron beams, and thus, all the electron beams are compulsorily subject to severe distortion.
  • those magnetic poles on both sides of those regions intersecting the axis Y respectively generate intense pin-cushion type magnetic fields 151 and 152 which are inverse form the barrel-like vertical deflection magnetic field 150 so that the intense Lorentz's force can eventually be offset.
  • those adverse phenomena like elliptical distortion of beam spots of those three electron beams and inclination of those side electron beams against the horizontal direction are effectively eliminated.
  • those magnetic poles on both sides of those regions intersecting the axis X respectively generate intense pin-cushion type magnetic fields 153 and 154. Furthermore, in order to minimize adverse influence of the intense barrel-like vertical deflection magnetic field 150 affecting those side beams, those magnetic poles on both sides of those regions not intersecting axes X and Y respectively generate the other magnetic field 155 which consequently generates specific Lorentz' force inverse from the one generated by the barrel-like vertical deflection magnetic field 150. As a result, the preceding Lorentz's force is offset, thus cancelling the inclination of those side beams against the horizontal direction.
  • the intervals La be provided between those magnetic poles on both sides of the axis Y by way of being narrower than the intervals Sg provided for a pair of those side beams in the aligned direction.
  • the permanent magnet disc 70 embodied by the invention easily corrects spots of those three electron beams, and in addition, owing to its compact size, the permanent magnet ring 70 is inexpensive and promotes workability for implementing the mass production.
  • the preceding color cathode ray tube apparatus added with the auxiliary coil cited above fluctuates the deflection magnetic field by effect of deflection current, and thus, when compensating for the spot shape of those three electron beams by applying the added auxiliary coil, depending on the position of electron beams, correction effect may become too short or excessive.
  • the apparatus when applying the color cathode ray tube apparatus using the permanent magnet disc 70 embodied by the invention, the apparatus can stably correct magnetic field all the time. In other words, neither shortage nor excess occurs in the effect of correcting the beam spot shape irrelevant of the position of the electron beams. As a result, electron beam spot can constantly be shaped into perfectly circular form all over the phosphors screen.
  • the line of magnetic force may deviate itself from the correct direction, and as a result, the magnetic poles cannot be set to correct positions.
  • the permanent magnet ring 70 embodied by the invention can discretely provide a plurality of magnetic poles, all the magnetic poles can precisely be set to the predetermined positions.
  • the disc-shaped permanent magnet 70 embodied by the invention can easily generate axially symmetrical corrective magnetic field, thus eventually achieving improved focus characteristic without causing the convergence characteristic to be lowered.
  • Fig. 12 designates the second embodiment of the permanent magnet disc 70. Except for the ring-shaped permanent magnet 70 introduced to the first embodiment, the second embodiment uses those components exactly identical to those of the first embodiment.
  • the second embodiment provides a pair of permanent magnet members for making up an integral permanent magnet disc. Concretely, those permanent magnet members 161a and 161b are respectively provided with four magnetic poles. These four magnetic poles provided for each of these permanent magnet members 161a and 161b are symmetrically positioned, which are conjunctionally united to complete a disc-shaped permanent magnet 162 like the one provided for the first embodiment.
  • the complete permanent magnet disc 162 yields satisfactory effect identical to that is generated by the disc-shaped permanent magnet 70 of the first embodiment.
  • Figs. 13 and 14 respectively designate modified examples of the permanent magnet 162 of the second embodiment.
  • those magnet poles on a pair of permanent magnet member 171a and 171b and another pair of permanent magnet members 181a and 181b are positioned apart from each other in the structure of those permanent magnets 172 and 182. Provision of these magnetic poles at discrete positions minimizes mutual interference of those magnetic poles to effectively promote magnetization.
  • the scope of the second embodiment does not solely specify the number of applicable permanent magnet to be only two pieces, but a minimum of three permanent magnet members may also be introduced as well.
  • the above first and second embodiments respectively provided the ring-shaped permanent magnet at a specific position corresponding to an end of the electron gun.
  • the third embodiment shown in Fig. 15 secures the permanent magnet disc 28 between the core 24 and the rear end region 27 of the electron gun.
  • the ring-shaped permanent magnet may also be composed of a pair of semicircular shaped permanent magnet members 164a and 164b in union. Nevertheless, it is of course possible for the third embodiment to provide the permanent magnet disc which can be composed of three or more than three of component members instead of merely specifying the available number to be only two pieces of permanent magnet member. The same also applied to the second embodiment as well.
  • the first, second and the third embodiments respectively secure the permanent magnet disc to the deflection device.
  • the invention provides another embodiment which directly installs the permanent magnet disc to the electron-gun assembly 20.
  • the electron-gun assembly 20 comprises the following; three independent cathodes 30 which are aligned on a rank in the horizontal direction, an electron beam generator incorporating the first and second grids 31 and 32 which respectively control electron beam emitted from those three independent cathodes 30, and an electron lens section incorporating the third and fourth grids 33 and 34 which respectively accelerate and focus those three electron beams emitted from the electron beams generator.
  • a magnetic field control element consisting of a pair of magnetic members 41a and 41b is installed in the periphery of the side-beam permeating through holes at the bottom of the convergence cup 37 secured to the fourth grid 34.
  • the permanent magnet disc 28 is secured to the internal surface of the convergence cup 37, where the permanent magnet ring 28 generates eight-pole magnetic field which is symmetrical of both sides of the center axis 55 of the electron gun assembly 20.
  • the permanent magnet ring 28 substantially makes up a region allowing permeation of electron beams on the side of the electron gun assembly 20 of the deflection device, and yet, the permanent magnet disc 28 may be installed to a position much closer to the deflection device than the electron lens section of the electron gun assembly 20.
  • the whole substance of the permanent magnet disc may not necessarily be magnetic, but the magnetism may merely be present in those regions accommodating those magnetic poles. Needless to say, the process for magnetizing the magnetic members shall precede the process for installing the color cathode ray tube to the apparatus.
  • the color cathode ray tube apparatus embodied by the invention incorporates an electron gun which emits three electron beams aligned on a rank and a deflection device which generates deflected magnetic field deflecting those three electron beams emitted from the electron gun in the aligned direction and in the direction orthogonally intersecting the aligned direction.
  • the ring-shaped permanent magnet generating eight-pole magnetic field is disposed at a position on the side of the electron gun of the deflection device or at a position close to electrons on the side of the phosphorous screen of the main lens section of the electron gun assembly.
  • the circular permanent magnet disceasily promotes magnetization of magnetic poles, and yet, the permanent magnet disc itself is integrated with those magnetic poles which are precisely magnetized and secured to the predetermined positions, and as a result, the permanent magnet disc correctly generates eight-pole magnetic field in perfect symmetry.

Claims (8)

  1. Dispositif de déviation (64) qui convient pour un appareil de tube à rayons cathodiques couleur comprenant une section de panneau (52), une section d'entonnoir (58) et une section de col (60) fixant de façon interne un assemblage de canons à électrons (62), ledit dispositif de déviation comprenant :
    une première bobine de déviation (80) qui dévie trois faisceaux d'électrons (B, R, G) émis depuis ledit assemblage de canons à électrons (62) suivant la direction en ligne sensiblement suivant la direction axiale X horizontale ;
    une seconde bobine de déviation (82) qui dévie lesdits trois faisceaux d'électrons émis depuis ledit assemblage de canons à électrons (62) suivant la direction axiale Y verticale ; et
    un moyen d'aimant permanent à huit pôles (70) qui est prévu autour de l'axe tubulaire (axe Z) entre une région d'extrémité dudit dispositif de déviation (64) et une section de lentille électronique principale dudit assemblage de canons à électrons (62), pour générer des champs magnétiques permettant de minimiser une aberration de déviation desdits trois faisceaux d'électrons provoquée par le champ magnétique dudit dispositif de déviation,
    caractérisé en ce que :
    ledit moyen d'aimant permanent à huit pôles (70) comprend un disque de forme générale torique circulaire sur lequel les huit pôles sont formés.
  2. Dispositif de déviation selon la revendication 1, caractérisé en ce que ledit moyen d'aimant permanent à huit pôles (70) est sensiblement constitué par une pluralité de plaques de forme générale torique circulaire.
  3. Dispositif de déviation selon la revendication 1, caractérisé en ce que ledit moyen d'aimant permanent à huit pôles (70) comprend des anneaux magnétiques agencés suivant l'axe tubulaire ou est divisé en deux éléments suivant la direction perpendiculaire à l'axe tubulaire.
  4. Dispositif de déviation selon la revendication 1, caractérisé en ce que des intervalles entre deux paires de pôles magnétiques qui sont disposées en des positions spécifiques proches des deux côtés d'un axe suivant la direction axiale X dudit moyen d'aimant permanent à huit pôles (70) et des intervalles entre deux autres paires de pôles magnétiques qui sont disposées en des positions spécifiques proches des deux côtés d'un axe suivant la direction axiale Y dudit moyen d'aimant permanent à huit pôles (70) sont respectivement plus étroits que les intervalles entre quatre paires de pôles magnétiques qui sont éloignées desdits axes suivant les directions axiales X et Y.
  5. Dispositif de déviation selon la revendication 1, caractérisé en ce que deux paires de pôles magnétiques qui sont disposées en des positions spécifiques proches des deux côtés d'un axe suivant la direction axiale X et deux autres paires de pôles magnétiques qui sont disposées en des positions spécifiques proches des deux côtés d'un axe suivant la direction axiale Y sont respectivement pourvues d'intensités polaires magnétiques spécifiques égales les unes aux autres.
  6. Dispositif de déviation selon la revendication 1, caractérisé en ce que des intervalles entre deux paires de pôles magnétiques qui sont disposées en des positions spécifiques proches des deux côtés d'un axe suivant la direction axiale Y sont plus étroits que l'intervalle entre une paire de faisceaux d'électrons latéraux émis depuis ledit assemblage de canons à électrons (62).
  7. Dispositif de déviation selon la revendication 1, caractérisé en ce que, si l'on suppose la présence d'un plan passant par les axes suivant les directions axiales X et Y dans ledit moyen d'aimant permanent à huit pôles (70), tel que vu sensiblement depuis un écran au phosphore, le pôle N est le pôle magnétique qui est le plus proche de l'axe suivant la direction axiale X dans le sens des aiguilles d'une montre.
  8. Dispositif de déviation qui convient pour un appareil de tube à rayons cathodiques couleur comprenant une section de panneau (52), une section d'entonnoir (58) et une section de col (60) fixant de façon interne un assemblage de canons à électrons (62), comprenant :
    une première bobine de déviation (80) qui dévie trois faisceaux d'électrons (B, R, G) émis depuis ledit assemblage de canons à électrons (62) suivant la direction en ligne sensiblement suivant la direction axiale X horizontale ;
    une seconde bobine de déviation (82) qui dévie lesdits trois faisceaux d'électrons émis depuis ledit assemblage de canons à électrons (62) suivant la direction axiale Y verticale ;
    un noyau (24) qui reçoit ladite seconde bobine de déviation (82) enroulée dessus ; et
    un moyen d'aimant permanent à huit pôles (70) qui est prévu autour de l'axe tubulaire (axe Z) pour générer un champ magnétique permettant de minimiser une aberration de déviation desdits trois faisceaux d'électrons provoquée par le champ magnétique dudit dispositif de déviation,
    caractérisé en ce que :
    ledit moyen d'aimant permanent à huit pôles (70) est prévu entre une région d'extrémité dudit dispositif de déviation et ledit noyau (24) et comprend un disque de forme générale torique circulaire sur lequel les huit pôles sont formés.
EP19910107505 1990-05-10 1991-05-08 Dispositif de tube à rayons cathodiques en couleurs Expired - Lifetime EP0456224B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP118683/90 1990-05-10
JP2118683A JP3034906B2 (ja) 1990-05-10 1990-05-10 カラー受像管および偏向装置

Publications (3)

Publication Number Publication Date
EP0456224A2 EP0456224A2 (fr) 1991-11-13
EP0456224A3 EP0456224A3 (en) 1993-02-24
EP0456224B1 true EP0456224B1 (fr) 1996-03-27

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EP19910107505 Expired - Lifetime EP0456224B1 (fr) 1990-05-10 1991-05-08 Dispositif de tube à rayons cathodiques en couleurs

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EP (1) EP0456224B1 (fr)
JP (1) JP3034906B2 (fr)
DE (1) DE69118235T2 (fr)

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NL8600355A (nl) * 1986-02-13 1987-09-01 Philips Nv Inrichting voor het weergeven van televisiebeelden en afbuigeenheid daarvoor.
KR920000940B1 (ko) * 1988-06-27 1992-01-31 가부시끼가이샤 도시바 칼라 수상관 및 편향 장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI771003B (zh) * 2020-06-17 2022-07-11 漢辰科技股份有限公司 混合磁鐵結構

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JPH0417238A (ja) 1992-01-22
EP0456224A3 (en) 1993-02-24
EP0456224A2 (fr) 1991-11-13
JP3034906B2 (ja) 2000-04-17
DE69118235D1 (de) 1996-05-02
DE69118235T2 (de) 1996-08-22

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