EP0030704B1 - Vorrichtung zum Magnetisieren einer Konvergenzeinrichtung für Inline-Farbbildröhren - Google Patents

Vorrichtung zum Magnetisieren einer Konvergenzeinrichtung für Inline-Farbbildröhren Download PDF

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Publication number
EP0030704B1
EP0030704B1 EP80107753A EP80107753A EP0030704B1 EP 0030704 B1 EP0030704 B1 EP 0030704B1 EP 80107753 A EP80107753 A EP 80107753A EP 80107753 A EP80107753 A EP 80107753A EP 0030704 B1 EP0030704 B1 EP 0030704B1
Authority
EP
European Patent Office
Prior art keywords
coils
neck
convergence
axis
colour
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
Application number
EP80107753A
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German (de)
English (en)
French (fr)
Other versions
EP0030704A2 (de
EP0030704A3 (en
Inventor
Erhard Kienle
Walter Kornaker
Felix Greiner
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.)
Nokia Deutschland GmbH
Original Assignee
International Standard Electric Corp
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Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of EP0030704A2 publication Critical patent/EP0030704A2/de
Publication of EP0030704A3 publication Critical patent/EP0030704A3/de
Application granted granted Critical
Publication of EP0030704B1 publication Critical patent/EP0030704B1/de
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances

Definitions

  • the invention relates to a device for magnetizing the permanent magnetic convergence device of an inline color picture tube, in which a permanent magnet arranged in a longitudinal axis of the convergence device lying perpendicular to the z-direction of the color picture tube plane by means of coils arranged on the neck of the tube and generating an electromagnetic field in the direction of the convergence device plane. and is unmagnetizable.
  • Such a device is known from DE-A-2 832 667.
  • the coils which produce the magnetization (required for achieving static convergence) in the permanent magnet are arranged in four groups and in two planes one behind the other in the direction of the longitudinal axis of the tube, their shape being circular.
  • the known device is constructive very expensive and it has been shown that the setting of the static convergence with such a device can have an unfavorable effect on the shape stability.
  • a convergence device consisting of diametrically magnetized rings made of permanent magnetic ferrite material is described in the article in "Funkschau" (1976), No. 5 , Pages 59 and 60.
  • the object on which the invention is based is therefore to create a magnetizing device for magnetizing the static convergence device, which is to be as compact as possible and is to be arranged close to the convergence device and which acts on the convergence device in such a way that the convergence device in each case only one electron beam - independently of the other electron beams - experiences magnetizing influences.
  • This magnetization should also have the least possible influence on the shape of the electron beams.
  • the magnetic coils Since the magnetic coils have different dimensions, they are adapted to the shape of the convergence device. Since all coil dimensions lie in the plane of the convergence device, the smallest possible change in beam shape is guaranteed. By adapting the coil shape to the shape of the convergence device, it is possible to achieve very strong magnetizing fields. This allows the construction of magnetizing devices in which the coils, which are required to achieve a multi-pole field, can be arranged on circles with different radii around the tube neck. It has been found that such a device can even magnetize through a deflection system arranged around the tube neck. Novel deflection systems in fact extend over such a long area of the color picture tube neck that they still cover part of the electron gun. It was previously necessary to adjust the convergence and color purity before the deflection system was attached to the tube. The fields of the magnetizing device according to the invention are so strong, however, that the hard magnetic material attached to the tube neck can be magnetized or re-magnetized even through the deflection system already attached.
  • the convergence device made of hard magnetic material, which consists of a wire ring 1 with an air gap arranged in the interior of the color picture tube neck. This ring is arranged concentrically with the central electron beam 5. The electron beam direction is designated z. The ring is located in the convergence plane, which is perpendicular to the z-axis. Instead of the shape of a ring, the convergence device can also have a different shape.
  • Fig. 1 shows the wire ring 1 in the direction of view of the convergence device level, so that the wire ring 1 appears only as a line.
  • the rectangular, electrically excitable magnet coil 2 can be seen, the magnetic axis of which lies in the viewing direction.
  • the longer dimension of the coil 2 is parallel to the convergence device level. It can be seen that the coil shape is well adapted to the shape of the converging device.
  • the diameter of a round coil 3 which encloses the same area as the rectangular coil, is shown in broken lines.
  • Fig. 1 is easy to imagine that the rectangular coil generates a homogeneous field over the entire extent of the convergence device.
  • edge regions of the convergence device would be located in the inhomogeneous edge field of the coil.
  • the diameter of the round coil 3 would have to be larger. This would, however, only achieve a considerably weaker field with the same current flow in the coil. The maximum current flow is limited by the available voltage sources.
  • the mode of operation of a magnetizing device according to FIG. 2 is first described below, followed by information on the geometric dimensions and the electrical properties of the coils.
  • These six coils are operated in such a way that they impress a six-pole field into the wire ring 1, through which the two outer electron beams can be displaced in the x direction together with respect to the central electron beam.
  • eight further coils are arranged, the radially arranged magnetic axes of which each enclose angles of 45 °.
  • the four coils, the magnetic axes of which coincide with the x and y axes, are designated by 9.
  • Those four coils, the magnetic axes of which are each offset by 45 ° with respect to the x and y axes, are designated by 10.
  • the four coils 9 are operated in such a way that a four-pole field is impressed into the wire ring 1, with which the two outer beams 4 can be displaced relative to one another in the y direction, but the central electron beam 5 remains unaffected.
  • the four coils 10, on the other hand, are operated in such a way that a four-pole field is impressed into the wire ring 1, by means of which the two outer electron beams 4 are displaced relative to one another in the x direction, but the central electron beam 5 also remains unaffected.
  • the coils for the four-pole fields can also be arranged on two circular radii analogous to the six-pole coils.
  • All of the previously mentioned coils used to adjust the static convergence are arranged on circles with different radii.
  • elongated coils are required, which generate an identical, homogeneous field at the location of all three electron beams.
  • the magnetic axes of the color purity coils coincide with the y axis.
  • the two color purity coils 11 arranged in the y-direction above and below the coils described so far are operated in such a way that a two-pole field is created which shifts all three electron beams together by the same amount in the x-direction.
  • the possibility of a common deflection of all three electron beams in the y direction is desired for the raster adjustment.
  • two additional raster correction coils 12 are provided in the device according to FIG. 2, the magnetic axes of which coincide with the x-axis and which are located to the left and right of the convergence coils in the x-direction.
  • the coils 12 are also operated so that a two-pole field is created.
  • All coils have a rectangular shape.
  • the large dimensions of the color purity coils 11 and the raster correction coils 12 are approximately twice to three times as long as the diameter of the device for setting the static convergence in the x or y direction.
  • the large dimensions of the coils arranged on circles are each so large that all the coils on the circle form a closed circle.
  • the small dimension of all coils is about 1 cm.
  • the color purity and halftone correction coils each consist of 95 turns of a copper wire with a cross section of 0.5 mm 2.
  • the other coils consist of 150 turns of a copper wire with a cross section of 0.25 mm 2 .
  • the coils 12 provided for the basic deflection movement are each connected in series and excited with a capacitor of approximately 200 ⁇ F with a maximum of ⁇ 500 V. The achievable deflections lead to displacements of the electron beam landing points of up to ⁇ 15 mm on the screen of the color picture tube.
  • the magnetizing device described makes it possible to deflect the two outer electron beams together or against one another without influencing the central electron beam.
  • the magnetization is impressed into the material of the convergent device which can be magnetized and unmagnetized in a manner known per se, so that it is not dealt with in more detail here.
  • Fig. 3 shows a further embodiment of the Magnetizing device according to the invention, with each of which an outer electron beam 4 can be adjusted substantially independently of the middle and the other outer electron beam.
  • a permanent magnetic wire ring 3 is again to be provided in the tube neck 6 as a convergence device.
  • the dimensions of the device shown in FIG. 3 correspond to a magnetizing device which is provided for magnetizing a permanent-magnetic wire ring arranged inside a so-called thick-necked tube with an outside diameter of approximately 36 mm.
  • the structure and mode of operation of the color purity correction coils 11 and raster correction coils 12 correspond to those described in FIG. 2.
  • the wound magnetic coils 12 and 13 are shown only on the right and above, while only the unwound winding body can be seen below and left.
  • the shift of the right electron beam 4 in the x direction will first be described below.
  • the coils 13, the magnetic axes of which run parallel to the x axis or inclined at an angle thereto, are arranged one above the other in the y direction, but at equal intervals above and below the x axis. They are operated so that the polarity of one coil is exactly opposite to the polarity of the other coil. In this way, a magnetic field drawn in broken lines in FIG. 3 is generated in both coils, the field lines of which are closed via the wire ring 1.
  • the field lines at the location of the right outer electron beam 4 run essentially in the y direction, which causes this electron beam to be displaced in the x direction.
  • the displacement of the outer electron beam in the y direction is shown in FIG. 1 using the left outer electron beam 4.
  • the coil 14, the magnetic axis of which coincides with the x-axis, is excited in such a way that the coil forms the magnetic north and south poles shown.
  • the field lines close in a known manner outside the coil.
  • the left outer electron beam 4 is located in a dashed magnetic field in the x direction, which causes a deflection in the y direction.
  • the coil arrangements for deflecting an external electron beam in the x or y direction were only explained for one side of the magnetizing device. Since both coils 13 and 14 are present on each side in the magnetizing device, both outer electron beams 4 can be deflected independently of one another and independently of the central electron beam 5 individually in the x or y direction.
  • FIG. 4 shows the side view of the winding body on which the coils for raster correction 12 and for the independent deflection of an external electron beam in the x and y directions 13, 14 are wound in the device according to FIG. 3.
  • the distance of the winding body or the coil wound thereon from the tube neck 6 and from the convergence device 1 can be seen from FIG. 4.
  • the electrical design of the coil 12 corresponds to that described in FIG. 2.
  • the illustrated and described embodiments of the magnetizing device according to the invention are suitable for magnetizing a convergence device arranged inside the tube neck.
  • the same device, but with larger geometrical dimensions, can be used to magnetize a convergence device arranged on the outside of the tube neck or if the convergence device is arranged inside the tube neck, but parts of a deflection system are still located between the tube neck and the magnetizing device. It is a particular advantage of the magnetizing devices according to the invention that permanent magnetic materials arranged in the interior of the tube neck can also be magnetized through parts of the deflection system.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP80107753A 1979-12-12 1980-12-09 Vorrichtung zum Magnetisieren einer Konvergenzeinrichtung für Inline-Farbbildröhren Expired EP0030704B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2949851 1979-12-12
DE2949851A DE2949851C2 (de) 1979-12-12 1979-12-12 Vorrichtung zum Magnetisieren einer Konvergenzeinrichtung für Inline-Farbbildröhren

Publications (3)

Publication Number Publication Date
EP0030704A2 EP0030704A2 (de) 1981-06-24
EP0030704A3 EP0030704A3 (en) 1982-03-03
EP0030704B1 true EP0030704B1 (de) 1985-03-27

Family

ID=6088181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107753A Expired EP0030704B1 (de) 1979-12-12 1980-12-09 Vorrichtung zum Magnetisieren einer Konvergenzeinrichtung für Inline-Farbbildröhren

Country Status (6)

Country Link
US (1) US4395692A (fi)
EP (1) EP0030704B1 (fi)
JP (1) JPS6057652B2 (fi)
CA (1) CA1169116A (fi)
DE (1) DE2949851C2 (fi)
FI (1) FI70096C (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090108B1 (en) * 1982-03-31 1986-06-11 International Business Machines Corporation Convergence unit for in-line colour cathode ray tube
JPS6222351A (ja) * 1985-07-19 1987-01-30 Mitsubishi Electric Corp コンバ−ゼンス副調整装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2832667A1 (de) * 1977-07-26 1979-02-08 Rca Corp Verfahren zum erzeugen magnetisierter bereiche

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL170683C (nl) * 1975-04-01 1982-12-01 Philips Nv Werkwijze voor het vervaardigen van een statische convergentie-eenheid en een kleurenbeeldbuis voorzien van een convergentie-eenheid, vervaardigd onder toepassing van die werkwijze.
DE2612607C3 (de) * 1976-03-25 1984-01-12 Philips Patentverwaltung Gmbh, 2000 Hamburg Statische Konvergenzkorrekturvorrichtung in Farbfernsehbildwiedergaberöhren
DE2722477A1 (de) * 1977-05-18 1978-11-23 Standard Elektrik Lorenz Ag Farbfernseh-bildroehren
NL7707476A (nl) * 1977-07-06 1979-01-09 Philips Nv Werkwijze voor het vervaardigen van een kleuren- beeldbuis en kleurenbeeldbuis vervaardigd vol- gens die werkwijze.
US4159456A (en) * 1977-07-26 1979-06-26 Rca Corporation Magnetizing apparatus and method for use in correcting color purity in a cathode ray tube and product thereof
US4162470A (en) * 1977-07-26 1979-07-24 Rca Corporation Magnetizing apparatus and method for producing a statically converged cathode ray tube and product thereof
SU741349A1 (ru) * 1978-11-21 1980-06-15 Львовский Ордена Ленина Политехнический Институт Магнитна отклон юща система
DE2907898A1 (de) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing Vielpolige vorrichtung und verfahren zum magnetisieren von ringfoermigen dauermagneten

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2832667A1 (de) * 1977-07-26 1979-02-08 Rca Corp Verfahren zum erzeugen magnetisierter bereiche

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FUNKSCHAU (1976), Heft 5, Seiten 179, 180 *

Also Published As

Publication number Publication date
CA1169116A (en) 1984-06-12
FI70096B (fi) 1986-01-31
DE2949851A1 (de) 1981-06-19
JPS5693245A (en) 1981-07-28
DE2949851C2 (de) 1982-09-09
FI70096C (fi) 1986-09-12
EP0030704A2 (de) 1981-06-24
JPS6057652B2 (ja) 1985-12-16
EP0030704A3 (en) 1982-03-03
US4395692A (en) 1983-07-26
FI803861L (fi) 1981-06-13

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