EP0107987B2 - Procédé de transformation d'un déviateur permettant son utilisation pour des tubes à images autoconvergents de dimensions différentes et déviateur ainsi obtenu - Google Patents

Procédé de transformation d'un déviateur permettant son utilisation pour des tubes à images autoconvergents de dimensions différentes et déviateur ainsi obtenu Download PDF

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Publication number
EP0107987B2
EP0107987B2 EP83401888A EP83401888A EP0107987B2 EP 0107987 B2 EP0107987 B2 EP 0107987B2 EP 83401888 A EP83401888 A EP 83401888A EP 83401888 A EP83401888 A EP 83401888A EP 0107987 B2 EP0107987 B2 EP 0107987B2
Authority
EP
European Patent Office
Prior art keywords
deflection
tube
screen
coil
horizontal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP83401888A
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German (de)
English (en)
French (fr)
Other versions
EP0107987A1 (fr
EP0107987B1 (fr
Inventor
Jean-Pierre Fourché
Marc Milili
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Videocolor SA
Original Assignee
Videocolor SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Videocolor SA filed Critical Videocolor SA
Priority to AT83401888T priority Critical patent/ATE23763T1/de
Publication of EP0107987A1 publication Critical patent/EP0107987A1/fr
Application granted granted Critical
Publication of EP0107987B1 publication Critical patent/EP0107987B1/fr
Publication of EP0107987B2 publication Critical patent/EP0107987B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/766—Deflecting by magnetic fields only using a combination of saddle coils and toroidal windings

Definitions

  • the invention relates to a method for transforming a deflector for a color image tube, which comprises three electron guns producing beams in the same plane, and such that the tube-deflector assembly is self-converging, so that this tube is suitable - with the same self-convergence property - for a similar tube but of different dimensions, in particular smaller, or more generally, so that it is suitable for a family of tubes of the same deflection angle.
  • a device corresponding to the preamble of claim 1 is described in GB-A-2 029 089.
  • a tube for color television comprises three electron guns, each of which is intended to excite on the screen a phosphor substance of a determined color, red, green, or blue. At all times these three beams strike a triplet of luminescent substances on the screen.
  • the displacement of these three electron beams is obtained by means of a deflector mounted on the neck of the tube and which comprises two coils, each of which is traversed by an alternating electric current generating a variable magnetic field for deflecting the electronic beams.
  • One of these coils allows horizontal scanning, that is to say in lines, of the screen and the other coil is intended for vertical scanning, or raster scanning.
  • the same deflector can be suitable for two self-converging tubes which differ only in the size of the screen (and therefore also in the length of the conical part) provided that they are modified - in order to reduce the anisotropic astigmatism (cause of convergence faults between horizontal lines) - the distance separating the center of deflection - line from the center of deviation-frame (see for example GB-A-2 029 089).
  • one coil is moved axially relative to the other or the length of each coil is varied.
  • the invention makes it possible to further simplify the modification of a diverter for self-converging tube in order to adapt it to a tube of smaller dimensions.
  • the deflector is of the saddle-torus type with a saddle-shaped horizontal deflection winding ending at the front and at the rear by buns extending in planes perpendicular to the axis of the tube between which is disposed the vertical deflection coil in the shape of a torus, we can arrange the magnetic screen between the rear bun of the horizontal deflection coil and the rear face of the vertical deflection coil.
  • the deflector is of the saddle type
  • the vertical deflection coil being in the form of a saddle, like the horizontal deflection coil, with front and rear buns
  • the magnetic screen is for example placed between the rear bunches of the two coils.
  • the magnetic screen modifies the field lines in such a way that the center of vertical deflection is moved forward (towards the screen of the tube) and the center of horizontal deflection is moved towards the rear (towards the barrels).
  • the assembly formed by the color image tube and the deflector is self-converging;
  • the tube includes cannons producing coplanar beams and a mask with oblong holes.
  • the deflector 20 is mounted around the neck 21 and around the conical part 22 of the tube 23 which is connected to the neck. It includes a horizontal deflection coil 24 in the form of a saddle with a central part 25 conforming to the contour of the part of the tube which it surrounds and end buns, respectively 26 and 27, extending in a plane perpendicular to the axis 15 of the tube.
  • the role of the coil 24 is to produce the magnetic field horizontally displacing the electron beams produced by the three guns 28 inside the tube.
  • Another coil 29 in the form of a torus with a substantially rectangular section is wound on a core of ferromagnetic material such as ferrite and surrounds the coil 24 between the front 26 and rear buns 27. It ensures the vertical displacement of the beams produced by the barrels 28 .
  • the diagonal of the screen 30 having a length of 67 cm, the coil 24 of horizontal deflection has a center of deflection 31 on the axis 15, which is separated from the center 32 of vertical deflection, or weft, of the coil 29 by a distance of the order of a few millimeters (see Figs. 3 and 4). It is the center of horizontal deflection 31 which is closest to the screen 30.
  • the screen 30 ′ shown in broken lines in FIG. 1, is smaller than the screen 30, its diagonal having a length of 56 cm, but moreover having the same characteristics : same barrels 28, same diameter and same length of the neck 21, same opening angle of the conical part 22, it is necessary that the deflection centers, respectively horizontal and vertical, of the deflector are practically coincident or at a short distance from it one of the other.
  • the common center 33 of horizontal and vertical deflection for a deflector suitable for a tube whose screen 30 ′ has a diagonal of 56 cm must be between the centers of horizontal 31 and vertical deflection 32.
  • the tube whose screen has a 56 cm diagonal has a center of horizontal deflection of its deflector closer to the barrels and a center of vertical deflection of its deflector more distant from the barrels.
  • a magnetic screen 35 (FIG. 2) which, in the example, is between the rear bun 27 of the coil 24 of horizontal deflection in the form of a saddle and the rear part 36 of the coil 29 of vertical deflection in the form of a torus.
  • This magnetic screen is made of a material, for example mumetal, with high magnetic permeability, greater than 1.
  • FIG. 3 is a diagram showing the variations along the axis 15 of the magnetic field H. produced by the coil 29 of vertical deflection.
  • the curve 37 in solid lines corresponds to the magnetic field in the absence of the screen 35.
  • the center 32 of vertical deflection is the projection on the axis 15 of the center of gravity of the surface delimited by this curve 37 and the axis 15.
  • Figure 4 is a diagram similar to that of Figure 3 but showing the variations along the axis 15 of the magnetic field H o produced by the coil 24 of horizontal deflection.
  • the curve 40 in solid lines corresponds to the absence of magnetic screen 35.
  • the center of horizontal deflection of the deflector 20 is at point 31.
  • the rear part 41 of the curve 40 moves backwards, thus becoming curve 42 in broken lines. Under these conditions, the center of horizontal deviation moves at 33 backwards.
  • FIG. 5 is a diagram showing the vertical deflection coil 29 with the field lines produced by the latter in the horizontal plane (plane ZX). It can be seen that the field lines in the vicinity of the magnetic screen 35 and of the rear part 36 of the coil 29 in the shape of a torus are deviated from their initial trajectory 43 and moved forward (at 43 ′) due to the mirror effect produced by this magnetic screen 35, which explains the displacement of the center of vertical deviation (FIG. 3).
  • Figure 6 is a diagram similar to that of Figure 5, but for the coil 24 of horizontal deflection.
  • the field lines 44 at the rear of the magnetic screen 35 are pushed back even more, which explains the passage from curve 41 to curve 42 in FIG. 4 and the displacement of the center.
  • horizontal deflection when said screen 35 is introduced between the bun 27 and the rear part 36 of the coil 29.
  • the quality of the image obtained on the screen of the tube depends on the shape, the dimensions and the position of the magnetic screen 35.
  • the screen 35 we have available '' a means of additional adjustment of the tube. This adjustment is obtained by modifying the position and / or the dimensions and / or the shape of the screen 35.
  • the screen 35 increases the horizontal deflection and decreases the vertical deflection. As a result, the supply energy of the horizontal deflection coil is lower while the supply energy of the vertical deflection coil is greater.
  • the magnetic screen 35 is in two parts constituting the two halves of a crown extending in a plane perpendicular to the axis 15, practically all around this axis.
  • the deflector has a plastic carcass 50 with central cylindrical hole for the passage of the neck 21 and inside which is the main part 25 of the horizontal deflection winding 24. Around this carcass is arranged the vertical deflection winding.
  • the rear bun 27 is applied against the rear face 51 of a crown, or end flange 52 of the carcass 50.
  • the coil 29 (not visible in the figure 7) is on the other side, relative to the bun 27, of this crown 52.
  • the magnetic screen 35 is disposed between the bun 27 and the rear face 51 of the crown 52. Its separation into two parts is intended to allow its mounting.
  • the magnetic screen 35 is formed of four segments 35 1 , 35 2 , 35 3 and 35 4 of a crown, which are distributed regularly around the axis 15, each segment being shaped and arranged in such a way that the bisector of the quadrant that it occupies constitutes an axis of symmetry for this segment.
  • the horizontal deflection coil 24a is identified with the coil 24 of FIG. 2.
  • the vertical deflection coil 54 is, like the saddle-shaped coil 24a. This coil 54 is shorter than the coil 24a; it surrounds the latter and it has front buns 55 and rear 56 extending perpendicular to the axis of the tube.
  • the magnetic screen 35a is disposed between the rear bun 27a of the coil 24a and the rear bun 56 of the coil 54.
  • a ferrite core 57 is disposed between the buns 55 and 56 around the central part of the coil 54.
  • the magnetic screen 35 b has a part 60 perpendicular to the axis 15 and an extension 61 towards the rear, that is to say towards the barrels, and in an oblique direction.
  • This extension increases, to a greater extent than the simple crown 35 or 35a, the horizontal deflection field at the rear of the deflector.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP83401888A 1982-10-05 1983-09-27 Procédé de transformation d'un déviateur permettant son utilisation pour des tubes à images autoconvergents de dimensions différentes et déviateur ainsi obtenu Expired - Lifetime EP0107987B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401888T ATE23763T1 (de) 1982-10-05 1983-09-27 Verfahren zur aenderung einer ablenkeinheit das seine verwendung in autokonvergierenden bildroehren verschiedener groesse ermoeglicht und auf diese weise erhaltene ablenkeinheit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216680A FR2534065A1 (fr) 1982-10-05 1982-10-05 Procede de transformation d'un deviateur permettant son utilisation pour des tubes a images autoconvergents de dimensions differentes et deviateur ainsi obtenu
FR8216680 1982-10-05

Publications (3)

Publication Number Publication Date
EP0107987A1 EP0107987A1 (fr) 1984-05-09
EP0107987B1 EP0107987B1 (fr) 1986-11-20
EP0107987B2 true EP0107987B2 (fr) 1990-03-14

Family

ID=9277990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401888A Expired - Lifetime EP0107987B2 (fr) 1982-10-05 1983-09-27 Procédé de transformation d'un déviateur permettant son utilisation pour des tubes à images autoconvergents de dimensions différentes et déviateur ainsi obtenu

Country Status (9)

Country Link
US (1) US4538128A (ja)
EP (1) EP0107987B2 (ja)
JP (1) JPS5987740A (ja)
AT (1) ATE23763T1 (ja)
DE (1) DE3367821D1 (ja)
FR (1) FR2534065A1 (ja)
HK (1) HK16890A (ja)
PT (1) PT77365B (ja)
SG (1) SG66789G (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3439808A1 (de) * 1984-10-31 1986-04-30 Standard Elektrik Lorenz Ag, 7000 Stuttgart Ablenksystem fuer farbbildroehren
US4823100A (en) * 1985-07-31 1989-04-18 Rca Licensing Corporation Deflection distortion correction device
CA1269694A (en) * 1985-07-31 1990-05-29 Paul Michael Bruey Deflection distortion correction device
NL8600833A (nl) * 1986-04-02 1987-11-02 Philips Nv Kathodestraalbuis.
DE3706015A1 (de) * 1987-02-25 1988-11-17 Henkel Kgaa Fluessiges reinigungsmittel

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2602902A (en) * 1950-02-14 1952-07-08 Bendix Aviat Corp Sweep amplitude control for magnetically deflected cathode-ray tubes
US2763804A (en) * 1953-12-01 1956-09-18 Rca Corp Cathode ray tube device
JPS4822364B1 (ja) * 1968-10-09 1973-07-05
JPS568056B2 (ja) * 1972-11-08 1981-02-21
JPS5224530A (en) * 1975-07-01 1977-02-24 Matsushita Electric Ind Co Ltd Image formation method
NL188373C (nl) * 1978-02-06 1992-06-01 Philips Nv Afbuigjuk voor kleurentelevisiebeeldweergeefbuizen.
NL188484C (nl) * 1978-02-06 1992-07-01 Philips Nv Afbuigjuk voor kleurentelevisiebeeldweergeefbuizen.
JPS54131795A (en) * 1978-04-01 1979-10-13 Akira Nakano Apparatus for twisting naked and of distributing wire material
NL174198C (nl) * 1978-08-25 1984-05-01 Philips Nv Serie van ten minste twee beeldbuis/afbuigeenheid combinaties, afbuigeenheid bestemd voor een dergelijke combinatie, alsmede werkwijze voor het vervaardigen van een dergelijke afbuigeenheid.
US4231009A (en) * 1978-08-30 1980-10-28 Rca Corporation Deflection yoke with a magnet for reducing sensitivity of convergence to yoke position
JPS5831697B2 (ja) * 1979-03-12 1983-07-07 株式会社日立製作所 偏向ヨ−ク
NL7908000A (nl) * 1979-11-01 1981-06-01 Philips Nv Afbuigjuk.
JPS573352A (en) * 1980-06-06 1982-01-08 Denki Onkyo Co Ltd Deflection yoke

Also Published As

Publication number Publication date
FR2534065B1 (ja) 1985-02-08
US4538128A (en) 1985-08-27
FR2534065A1 (fr) 1984-04-06
EP0107987A1 (fr) 1984-05-09
DE3367821D1 (en) 1987-01-08
PT77365A (fr) 1983-10-01
ATE23763T1 (de) 1986-12-15
PT77365B (pt) 1986-03-11
HK16890A (en) 1990-03-09
EP0107987B1 (fr) 1986-11-20
SG66789G (en) 1990-01-26
JPS5987740A (ja) 1984-05-21

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