EP0067390A2 - Dispositif d'ajustement du faisceau d'électrons pour un tube à rayons cathodiques - Google Patents

Dispositif d'ajustement du faisceau d'électrons pour un tube à rayons cathodiques Download PDF

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Publication number
EP0067390A2
EP0067390A2 EP82104947A EP82104947A EP0067390A2 EP 0067390 A2 EP0067390 A2 EP 0067390A2 EP 82104947 A EP82104947 A EP 82104947A EP 82104947 A EP82104947 A EP 82104947A EP 0067390 A2 EP0067390 A2 EP 0067390A2
Authority
EP
European Patent Office
Prior art keywords
magnetic ring
axis
electron
electron beam
central
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.)
Ceased
Application number
EP82104947A
Other languages
German (de)
English (en)
Other versions
EP0067390A3 (fr
Inventor
Walter Kornaker
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
Standard Elektrik Lorenz AG
Nokia Graetz GmbH
International Standard Electric Corp
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
Application filed by Standard Elektrik Lorenz AG, Nokia Graetz GmbH, International Standard Electric Corp filed Critical Standard Elektrik Lorenz AG
Publication of EP0067390A2 publication Critical patent/EP0067390A2/fr
Publication of EP0067390A3 publication Critical patent/EP0067390A3/fr
Ceased 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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/703—Static convergence systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/58—Electron beam control inside the vessel
    • H01J2229/581—Electron beam control inside the vessel by magnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/58—Electron beam control inside the vessel
    • H01J2229/583—Electron beam control inside the vessel at the source
    • H01J2229/5835—Electron beam control inside the vessel at the source cooperating with the electron gun

Definitions

  • the invention relates to a device for adjusting electron beams in a cathode ray tube, in particular the convergence, color purity and raster of a color picture tube, with an electron gun with electrodes, which in the neck, which extends in the z direction, and which emits at least two electron beams in an xz plane,
  • a device consists of a magnet ring which is attached to the electron gun and can be magnetized from the outside and which, with two longitudinal and two transverse sides, encloses an elongated surface perpendicular to the electron beam plane, the long axis (x-axis) of which lies in the electron beam plane and the short axis (y Axis) is perpendicular to it.
  • a color picture tube with such a device was presented at the "Electronica” exhibition in 1980.
  • the device itself is described in the article related to this exhibition in Funkschau 26/1980, page 57.
  • the magnetic ring of the device consists of an iron-cobalt-vanadium alloy and has two magnetic ring parts abutting one another via air gaps.
  • the Mag netring is attached to the front of the focusing electrode of the electron gun and is magnetized to adjust the color purity, static convergence and grid from the outside, i.e. through the tube neck.
  • Each part of the magnetic ring has a curvature in the middle of its long side that points into the inside of the ring.
  • the meaning of such a curvature is described in the application P 30 03 197. It lies in the fact that when adjusting the color, all three electron beams are to be adjusted by the same horizontal values, that is to say to the left or to the right. It has been found that, for achieving this purpose, it is advantageous if the distance between the longitudinal sides of the magnetic ring decreases from the outside to the center. The distance can decrease evenly from the edge to the center, or an arching towards the central electron beam can be provided.
  • the invention has for its object to provide a device of the type described above, with which not only the mutual position of electron beams is satisfactory lend can be adjusted, but which also has a beneficial influence on the beam sharpness.
  • the y distance of the ring from the central axes of the outer electron beams is smaller than the y distance of the ring from the central axis of the central electron beam in the case of a magnetic ring of the type specified at the outset. It has been found that this measure not only leads to an increase in the sharpness of the electron beams ending on the screen compared to the sharpness in the tubes mentioned at the beginning, but also that the appearance of the so-called halo is reduced in its effects. Halo is understood to mean the error that is particularly noticeable at the edges of the screen and leads there to the result that a line is displayed on one or both sides with a weak yard.
  • the advantageous embodiment of a magnetic ring according to the invention depends on the chosen type of fastening on the electron gun and on the position of the magnetic ring in the z-direction in the electron gun.
  • Magnet rings which are shaped in such a way that they abut the inner wall of a pot-shaped electrode at only three points, can be attached particularly securely. This can be achieved particularly easily with two-part magnetic rings that have a larger radius of curvature than that of the electrode wall are provided and just touch them in three places.
  • Such a partial ring can be fastened in a simple manner by means of notches in the electrode wall, which are attached from the bottom of the cup-shaped electrode directly above the partial ring lying on the bottom into the interior of the pot.
  • each long side of the magnetic ring runs parallel to the x axis and in the central region away from the x axis is bent.
  • each long side is roughly in a range of the x coordinate which corresponds in value to the x coordinate of an outer electron beam, is bent in the y-direction toward the respective outer electron beam and is further away from the x-axis on such a bending area than in the respective bending area.
  • the ratio is constituted from the central region to the outer regions so with the present invention, the sharpness enhancing magnet rings that each region in about one third of the total length one long side comprises.
  • the electron gun 10 in Fig. 1 has a press glass plate 11, in which contact pins 12 are melted.
  • the contact pins 12 are conductively connected to contact tabs 13.
  • This is followed by a Wehnelt electrode 14, a control electrode 15, a focusing electrode 16, an anode 17 and a convergence pot 18 with contact springs 19.
  • the end with the press glass plate is generally referred to as the lower end and that with the convergence pot 18 as the upper end. In this sense, the terms above and below are also used in this application.
  • the individual parts of the electron gun 10, that is to say the contact lugs 13 and the electrodes 14 to 17, are held together by two glass rods 20 which are heated to softening in the manufacturing process and into which the opening edges 21 of the electrodes are then pressed. Only one of the two glass rods 20 can be seen in the side view.
  • the convergence pot 18 is connected to the anode 17 by spot welding. For the sake of clarity, not all connections between contact pins 12 and contact tabs 13 are shown, and cathodes and heaters are also not shown.
  • a magnetic ring 22 is in the focusing electrode 16 placed, which is shown in dashed lines in Fig. 1, since it is not recognizable from the outside in the side view.
  • the structure of the focusing electrode 16 is shown more clearly in the exploded view according to FIG. 2.
  • the focusing electrode 16 consists of four electrode parts 23 and an intermediate plate 24 .:
  • Each electrode part 23, like the Wehnelt electrode 14, the control electrode 15 and the anode 17, consists of a metal pot with bottom 26, cup wall 27 and opening edge 21.
  • three beam passage openings 28 are recessed, which have a circular shape, as is shown in FIG 3 is recognizable.
  • a central electron beam 29.1 passes through the central beam passage openings 28.1, and an outer electron beam 29.1 passes through the outer beam passage openings 28.2.
  • the beam passage openings 28 lie next to one another in an electrode part 23, which leads to an oval configuration of the electrode part 23.
  • the plane in which the electron beams 29 lie is referred to as the xz plane.
  • the z direction is the longitudinal direction of extension of the electron gun 10 and the tube neck 30, in which the electron gun 10 is inserted.
  • the tube neck 30 and the z direction are shown in broken lines in FIG. 1.
  • the y direction is perpendicular to the xz plane spanned by the three electron beams 29.
  • arbticianröhren F are so constructed that the x-axis is horizontal and the y-axis runs vertically.
  • two electrode parts 23 are first placed together with their bottoms and connected to one another by spot welding to form a central part 31.
  • the magnetic ring 22 is then inserted into the upper electrode part 23 of this middle part 31 and fastened by notches 32.
  • the notches 32 are made in the pot wall 27 in such a way that they point directly above the magnetic ring 22 into the interior of the electrode part 23.
  • the intermediate plate 24 and an electrode part 23 designated as the upper part 33 with its opening edge 21 are then placed on the upper opening edge 21 of the middle part 31.
  • the fourth electrode part 23, referred to as the lower part 34 is placed with its opening edge 21 on the lower opening edge of the central part 31. All parts are then held by the glass rods 20 pressed into the opening edges 21.
  • the shape of the magnetic ring 22 and its attachment by means of notches 32 can be seen even more clearly from FIGS. 3, 6 and 7.
  • the magnetic ring 22 consists of two identical magnetic ring parts 22.1, which together form an oval ring divided along the x-axis.
  • the ends of the magnetic ring parts 22.1 abut one another with an air gap 35.
  • the air gaps 35 are drawn very large, so that it can appear in the drawings 3, 5, 8 and 9 as if the ends of the magnetic ring parts 22.1 were not directly adjacent to one another.
  • the magnetic ring 22 can, however, also be completely closed, or the magnetic ring parts can form a ring while maintaining larger distances, which encloses a closed surface.
  • the magnetic ring parts 22.1 are made of a wire, for example one Iron-cobalt-vanadium alloy manufactured.
  • the wire is circular, as shown in the wire cross-sections 36 of FIGS. 6 and 7. Its diameter is 1.1 mm, but it can also have a different thickness, for example 0.8 mm.
  • Each magnetic ring part 22.1 has a central region 37 and two outer regions 38. The central region 37 runs parallel to the x-axis, while the outer regions 38 run uniformly on the x-axis. The end sections 39 of the magnetic ring parts 22.1 are finally bent so far relative to the central region 37 that they are almost at right angles to the latter.
  • a central region 37 with adjoining outer regions 38 each form a longitudinal side 40 and two adjacent end sections 39 form a transverse side 41.
  • a central region 37 and an outer region 38 are each approximately of the same length.
  • the overall dimension of the magnetic ring 22 is selected such that its outer areas 38 and its end sections 39 bear against the inside of the pot wall 27.
  • the diameter of the magnetic ring 22 in the x direction is 20.45 mm and in the y direction 9.4 mm.
  • Figures 2 to 9 are thus shown enlarged, while Fig. 1 shows the actual conditions to scale.
  • the magnetic ring acc. Fig. 3 is held by four notches 32 which are attached in the pot wall 27 above the end portions 39.
  • a further notch 32 can be provided over a central region 37, but this has not been shown to be absolutely necessary for secure fastening.
  • the magnetic ring 22 serves to influence the electrons radiate 29.
  • the electron beams 29 are influenced in their position and / or in their beam shape.
  • the primary purpose of the magnetic ring 22 is in color picture tubes is to influence by corresponding from the outside through the R hausenenhals 30 through successful magnetization by an unillustrated magnetizing the three electron beams 29 in their location with respect to color purity, convergence, and raster.
  • a corresponding magnetization for influencing the position also influences the sharpness of the electron beam. In this case, either an electron beam 29 as a whole can become blurred, that is to say the diameter of the light spot it generates on the screen of the tube becomes larger, or a halo error, that is to say a yard around a line, can occur.
  • the specified embodiment has a magnetic ring 22 with the result that the influence of the magnetic ring 22 to the S t rahlWarrfe more advantageous than in the previously known embodiment. 3 differs from previously known ones in that the y distance 46 of the central axis 42.1 of the central electron beam 29.1 from the magnetic ring 22 is greater than the y distance 47 of the central axis 42.2 of an outer electron beam 29.2 from the magnetic ring 22. This is due to the fact that the outer regions 38 run on the x-axis. The difference in the y-distances 46 and 47 is typically about 0.5 to 1 mm.
  • the embodiment described so far relates to a magnetic ring 22, as is advantageously used in a thin-necked tube with a high-voltage focusing electron gun 10 of a certain type.
  • the electron gun described there are a plurality of pot-shaped electrodes, on the base 26 of which the magnetic ring can be easily placed and held in the pot wall 27 by notches 32.
  • electron guns with plate-shaped electrodes are also known, on which a magnetic ring 22 is then to be fastened in a correspondingly suitable manner.
  • An exemplary embodiment is described in FIGS. 4 and 5.
  • the types of attachment and the shape of a magnetic ring 22 can also depend on whether the magnetic ring 22 is attached to an electron gun for a thin-necked tube with a 29 mm neck diameter or a thick-necked tube with a 36 mm neck diameter or for a tube with a different neck diameter or, for example, for a Trinitron tube or a multi-beam oscillograph tube is used. It is essential for the advantageous influence on the beam sharpness that the y distance of the central electron beam from the magnet ring 22 is greater than the corresponding y distance of an outer electron beam. Depending on the structure of the electron gun, it may be more advantageous to mount a magnetic ring 22 on the inside or outside of a cup-shaped electrode or further down or above in the electron gun.
  • a magnetic ring 22 with only one air gap or those with a larger number of individual magnetic ring parts and thus a plurality of air gaps or a closed ring can also be provided.
  • the most appropriate position and type of attachment of a magnetic ring 22 can also depend on the voltages applied to the electrodes.
  • an embodiment of an electron gun 10 is shown in which a high voltage of approximately 7 kV is present at the focusing electrode 16.
  • electron guns are also widely used in which only about 4.5 kV is applied to the focusing electrode 16.
  • Other electron guns differ from the one shown here in that instead of electrodes which are common to all three electron beams 29, there are three individual cannons with individual electrodes for each electron beam 29.
  • the individual cannons are also all in one plane, so that magnetic rings can also be used here which enclose an elongated surface.
  • the magnetic rings 22 can be made of circular wire as described herein or can e.g. be made of wire with an oval cross-section or ribbon-shaped wire.
  • a magnetic ring which surrounds an elongated surface is such that the magnetic ring is closer to one another in the y-direction is essential for the advantageous influence of a magnetic ring on the sharpness of the electron beams 29 the outer electron beams 29.2 lie on the middle electron beam 29.1.
  • the most advantageous location and the most advantageous type of attachment of such a magnetic ring 22 then depends on the special structure of an electron gun and is to be determined in each case by tests.
  • FIGS. 4 and 5 show a modified form of fastening a magnetic ring 22.
  • the magnetic ring 22 is placed on the intermediate plate 24 and fastened with tabs 43 bent up from the opening edge 21 of the intermediate plate 24.
  • tabs 43 which each engage on the long side 40 near the short side 41.
  • the long sides 40 of the magnetic ring 22 are curved outwards.
  • the diameter in the y direction is such that the upper part 33, when it is placed on the intermediate plate 24, with its cup wall 27 touches the outer edge of the magnetic ring 22 in the y direction and presses slightly inwards. This ensures a further securing of the position of the magnetic ring 22.
  • the curved shape according to FIGS. 4 and 5 is also advantageous for a magnetic ring inserted into a cup-shaped electrode part 23. This is especially the case if the end sections 39 are also designed such that they abut only one point on the longitudinal wall of an electrode part 23.
  • each magnetic ring part 22.1 shaped in this way lies only at three points on a pot wall 27 and can thus be secured in its position particularly securely by means of notches 32 made above the contact points.
  • the magnetic ring parts 22.1 according to FIGS. 4 and 5, like the magnetic ring parts 22.1 according to FIGS. 6 and 7, are embossed in their end sections in order to achieve a cross-sectional reduction. This is necessary because, in various embodiments of electron guns, the space available between beam passage openings 28 and pot wall 27 falls below the specified value of 1.1 mm of wire cross section 36 and only 0.6 or 0.8 mm are available here.
  • the shape of the magnetic ring in the vicinity of the electron beams also addresses the sharpness behavior of the electron beams. It is now known that in almost all known electron guns the central electron beam 29.1 and the outer electron beams 29.2 have different beam shapes due to the design. So z. B. the central electron beam is circular and the outer ones are elongated in the x or y direction, or it can be the other way round, or there can be a combination of such cases. In such cases, a corresponding influence on the different beam shapes can be exerted by appropriately shaping the magnetic ring 22.
  • each long side 40 has approximately the same value in a range of the x coordinate corresponds to the x coordinate of an outer electron beam 29.2, is bent in the y direction towards the respective outer electron beam 29.2 and is further away from the x axis on both sides of such a bending region 44 than in the respective bending region 44.
  • the magnetic ring 22 according to FIG. 8 is divided into two magnetic ring parts 22.1 in the y-axis.
  • the magnetic ring parts 22.1 thereby have a U-shape, with two legs that press against the pot wall 27 on its long side.
  • the magnetic ring parts 22.1 can be clamped and held in place by their elastic tension in the electrode part 23.
  • four notches are made in the longitudinal side of the pot wall 27 according to FIG. 8.
  • FIG. 9 An embodiment of a magnetic ring 22 with which a more inhomogeneous one is applied to the central electron beam 29.1 Effect can be exerted on the outer electron beams 28.2, is shown in Fig. 9.
  • This M agnetring 22 is formed such that each longitudinal side 40 runs, with the exception of the central portion 37 parallel to the x axis and is bent in the central region 37 of the x axis away.
  • the magnetic ring 22 is only split at one point on the x-axis and thus has only one air gap 35. It is held by two notches 32 in the cup wall 27 over the deflection area 45. Closed magnetic rings can also be used, which are produced, for example, by casting or pressing in a predetermined form.
  • the magnetic ring 22 in the embodiment according to FIG. 10 is also bent out in the central region 37; however, so far that 23 openings 48 are made in the electrode part, through which the bending areas 45 can pass. Due to this design, magnetic rings 22 can be used which are at a greater distance from the electron beams than magnetic rings which are entirely accommodated in a pot-shaped electrode part 23 without openings 48. The engagement of the central regions 37 by openings 48 of suitable dimensions simultaneously ensures a secure fastening of a magnetic ring 22.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP82104947A 1981-06-12 1982-06-05 Dispositif d'ajustement du faisceau d'électrons pour un tube à rayons cathodiques Ceased EP0067390A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3123301A DE3123301C2 (de) 1981-06-12 1981-06-12 Vorrichtung zum Einstellen von Elektronenstrahlen einer Kathodenstrahlröhre
DE3123301 1981-06-12

Publications (2)

Publication Number Publication Date
EP0067390A2 true EP0067390A2 (fr) 1982-12-22
EP0067390A3 EP0067390A3 (fr) 1984-09-05

Family

ID=6134525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104947A Ceased EP0067390A3 (fr) 1981-06-12 1982-06-05 Dispositif d'ajustement du faisceau d'électrons pour un tube à rayons cathodiques

Country Status (5)

Country Link
US (1) US4495438A (fr)
EP (1) EP0067390A3 (fr)
JP (1) JPS5814451A (fr)
CA (1) CA1206510A (fr)
DE (1) DE3123301C2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59170119A (ja) * 1983-03-16 1984-09-26 Hitachi Chem Co Ltd 熱可塑性ポリエ−テルイミド重合体の製造法
NL8303423A (nl) * 1983-10-06 1985-05-01 Philips Nv Kleurenbeeldbuis.
DE102011083214A1 (de) 2011-09-22 2013-03-28 Siemens Aktiengesellschaft Elektrische Leitungseinrichtung, Endenglimmschutzanordnung und Verfahren zum Herstellen eines Endenglimmschutzes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL242894A (fr) * 1958-09-06
US3614502A (en) * 1969-09-16 1971-10-19 Frederick F Doggett Electron gun convergence assembly
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.
DE3003197A1 (de) * 1980-01-30 1981-08-06 Standard Elektrik Lorenz Ag, 7000 Stuttgart Vorrichtung zum einstellen der elektronenstrahlen einer farbbildroehre

Also Published As

Publication number Publication date
JPS5814451A (ja) 1983-01-27
EP0067390A3 (fr) 1984-09-05
DE3123301A1 (de) 1983-01-05
US4495438A (en) 1985-01-22
DE3123301C2 (de) 1985-08-08
CA1206510A (fr) 1986-06-24

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