EP0134059B1 - Tube-image couleurs - Google Patents

Tube-image couleurs Download PDF

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Publication number
EP0134059B1
EP0134059B1 EP84201127A EP84201127A EP0134059B1 EP 0134059 B1 EP0134059 B1 EP 0134059B1 EP 84201127 A EP84201127 A EP 84201127A EP 84201127 A EP84201127 A EP 84201127A EP 0134059 B1 EP0134059 B1 EP 0134059B1
Authority
EP
European Patent Office
Prior art keywords
electrodes
focusing lens
apertures
aperture
outermost
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
EP84201127A
Other languages
German (de)
English (en)
Other versions
EP0134059A2 (fr
EP0134059A3 (en
Inventor
Hans Georg Gerlach
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0134059A2 publication Critical patent/EP0134059A2/fr
Publication of EP0134059A3 publication Critical patent/EP0134059A3/de
Application granted granted Critical
Publication of EP0134059B1 publication Critical patent/EP0134059B1/fr
Expired 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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • 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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4886—Aperture shape as viewed along beam axis polygonal

Definitions

  • the invention relates to a color picture tube with an evacuated piston, which is composed of a neck, a cone and an image window, in which neck an electron beam generating system is arranged, with which three electron beams with their axes are generated, which are applied with a focusing lens field a screen attached to the inside of the image window.
  • a focusing lens field is formed between two electrodes of the electron gun, which lie one behind the other on the axes, which electrodes are provided with mutually extending outer edges and in these edges in a deeper part which extends substantially perpendicular to the axes, three symmetrically with respect to the plane openings are made through which the electron beams pass.
  • the invention is therefore based on the object of specifying measures to improve the impact leak quality and to obtain smaller impact leak dimensions than in the known tubes with comparable jet currents.
  • this object is achieved in that the central opening in at least one of the electrodes is elongated and is designed such that a four-pole component and a compensating eight-pole component are produced in the focusing lens field at the location of the central electron beam, and the outer ones Openings in at least one of the electrodes are shaped such that a four-pole component and a compensating six-pole component are generated in the focusing lens field at the location of the outer electron beams.
  • the invention is based on the knowledge obtained on a trial basis and by calculations that, since the three electron beams lie with their axes in one plane and in outer edges that extend towards one another, not only is there a different focusing in the horizontal and vertical directions, but also in intermediate directions .
  • an eight-pole component arises around the central beam and a visual pole component around the outer beams in the focusing lens field. These multipole components must be compensated for at least for the most part.
  • the openings in the electrodes between which the focusing lens field is generated are given a shape which deviates from a round opening such that, in addition to the four-pole component, a compensating eight-pole component for the middle beam and a compensating one for the outer beams Six-pole component is obtained.
  • the horizontal / vertical astigmatism can be essentially compensated for by the four-pole component in the lens field.
  • a preferred first embodiment of a color picture tube according to the invention is therefore characterized in that the outer edge protrudes a distance beyond the deeper part, which is equal to 10 to 25% of the largest diameter of the deeper part in the outer edge.
  • the electrodes have an oval cross section perpendicular to the longitudinal axis of the electron gun. However, the electrodes can also have a round vertical cross section.
  • a compensating eight-pole component in the focusing lens field can be produced by giving the central opening in the lower part of the first and / or the second electrode essentially an octagonal shape in addition to an elongated shape for producing a four-pole component.
  • a compensating six-pole component in the focusing lens field can be produced by essentially giving the outer openings a pear shape.
  • a second preferred embodiment of the color picture tube according to the invention is therefore characterized in that when viewed in the direction of propagation of the electron beams, the central opening is elongated in at least the first of the two electrodes between which the focusing lens field is formed, the long axis of which is perpendicular to the plane mentioned and the Edge of this opening in the we forms an octagon and the outer openings are pear-shaped, the edges of which converge towards the outside when viewed from the central opening.
  • a focusing lens formed between two electrodes can be considered to be composed of two lens parts, namely a positive lens part (equipotential lines convex towards the low potential electrode) and a weaker negative lens part (equipotential lens convex towards the electrode) high potential). The strength of the positive lens part is always greater than that of the negative lens part, so that the two lens parts together have a positive lens effect.
  • the influence of the openings in the first electrode on the positive lens part is weakened by the influence of the openings in the second electrode on the negative lens part. This is explained in more detail below.
  • a third preferred embodiment of the color picture tube according to the invention is characterized in that seen in the direction of propagation of the electron beams in the second of the two electrodes, between which the focusing lens field is formed, the central opening is elongated, the long axis of which lies in the plane mentioned and the The edge of this opening essentially forms an octagon, and the outer openings are essentially pear-shaped, the edges of which, as seen from the central opening, diverge outwards.
  • the desired correction can also be obtained by this configuration of the openings in the second electrode.
  • the desired correction can also be carried out by combining the first and second preferred embodiments. It is clear that the desired eight-pole and six-pole components can also be created by, for example, making an elongated, essentially octagonal central opening in the first electrode with the long axis of the opening perpendicular to the plane mentioned and two outwardly diverging, essentially pear-shaped outer openings in the second electrode of the focusing lens can be obtained. It is also possible to obtain the desired eight-pole and six-pole components by e.g.
  • the pear-shaped openings are obtained in a simple manner in that they are composed of isosceles trapezoids converging outwards or inwards from the central opening, which are closed on the outside and / or inside with circular arcs.
  • a color picture tube of the so-called "in-line” type is shown in longitudinal section.
  • a glass bulb 1 which consists of an image window 2, a cone 3 and a neck 4, an integrated electron beam generation system 5 is arranged in this neck, which generates three electron beams 6, 7 and 8, which lie with their axes in the plane of the drawing.
  • the axis of the middle electron beam 7 initially coincides with the tube axis 9.
  • the image window 2 is provided on the inside with a large number of fluorescent triplets. Each triple contains a line of blue phosphor, a line of green phosphor, and a line of red phosphor. All triples together form the screen 10.
  • the fluorescent lines run perpendicular to the plane of the drawing.
  • a perforated mask 11 is arranged in front of the screen, in which a large number of elongated openings 12 are provided, through which the electron beams 6, 7 and 8 pass, each of which only reaches fluorescent lines of a single color.
  • the three electron beams lying in one plane are deflected by the deflection coil system 13.
  • FIG. 2 shows a longitudinal section of the electron beam generation system of the color picture tube according to FIG. 1.
  • the electron gun contains a common cup-shaped control electrode 20, in which three cathodes 21, 22 and 23 are fastened, and a common plate-shaped anode 24.
  • the three electron beams lying in one plane with their axes are by means of the electrodes 25 and 26 focused.
  • the electrode 25 consists of two cup-shaped parts 27 and 28 which are fastened to one another with their open ends.
  • the electrode 26 contains a single cup-shaped part 29 and a centering bush 30, the bottom of which is provided with openings 31 through which the electron beams pass.
  • the electrode 25 is provided with an outer edge 32 which extends to the electrode 26 and the electrode 26 is provided with an outer edge 33 which extends to the electrode 25.
  • openings 38, 39 and 40 attached in the recessed part 34, which extends perpendicular to the axes 35, 36 and 37 of the electron beams 6, 7 and 8, openings 38, 39 and 40 attached. Openings 42, 43 and 44 are made in the recessed part 41, which extends essentially perpendicular to the axis 36 of the central electron beam.
  • the recessed portions 34 and 41 may be integral with the portions 28 and 29, respectively, as in the electron gun system described in U.S. Patent 4,370,592.
  • the openings in the recessed parts can also be equipped with collars. Since the edge 33 has a larger opening than the edge 32, the electron beams converge behind the focusing lens.
  • the electron beams converge in or behind the triode part of the electron gun system which is formed by the cathode and the electrodes 20, 24 and 25; (See, for example, U.S. Patent 4,291,251).
  • the wall of the electrodes 25 and 26 is, for example, 0.25 mm thick.
  • the gap between the electrodes 25 and 26 has a width of 1 mm, for example.
  • the distance between the axes of the electron beams 35, 36 and 36, 37 is, for example, 4.45 mm
  • FIG. 3 shows a view of the lens electrode 25 according to FIG. 2. Due to the essentially octagonal and elongated configuration of the opening 39, the long axis of which extends perpendicular to the plane of the bundle axis 35, 36 and 37, the intersection line 45 of which is shown in the plane of the drawing, the eight-pole component is essentially balanced in addition to the horizontal / vertical astigmatism which is created in the focusing lens field by the edges 32 and 33.
  • the corners of the octagon can be rounded, which simultaneously compensates for higher order multipoles. It is also possible to form sides 46 and 47, which form parts of a circle in the drawing.
  • Such pear-shaped and octagonal openings can be easily realized by starting with a circle (dashed lines), parts (48, 49) of the circle being replaced by their chords (50, 51).
  • a pear-shaped opening made in this way has an edge with the shape of an isosceles trapezoid, the base and the apex line being replaced by circular arcs.
  • a part of the circular arc 52 can be replaced by its chord 53 (shown in broken lines).
  • the outer circles shown in broken lines have a radius of 2.15 mm, for example, and the middle circle has a radius of 1.9 mm.
  • the beam axes 35 and 36 and the beam axes 36 and 37 are, for example, 4.45 mm apart.
  • the corner points A, B, C and D lie at the locations indicated in the table
  • the edge 32 extends 2 mm above the recessed part 34.
  • the openings 38 and 40 are identical and are symmetrical with respect to the X axis.
  • the opening 39 is symmetrical with respect to the X and Y axes.
  • Line A is the course of the impingement leak diameter depending on the beam current in a conventional type electron gun with no edge and no recessed part.
  • Line B is the course of the impact spot diameter depending on the beam current in an electron beam generating system according to US Pat. No. 4,370,592.
  • Line C shows the course of the impact spot diameter depending on the beam current in an electron beam generating system for a color picture tube according to the invention.
  • the electrodes 25 and 26 are designed according to FIGS. 2 and 3.
  • the impingement leak diameter is smaller both at high and at low beam currents, as a result of which a sharper image can be obtained.
  • a 10 to 20% smaller impact leak was found in tubes according to the invention than in tubes in which the invention was not used.
  • the desired eight and six-pole component correction can also be obtained.
  • the four-pole component in the focusing lens field at the location of the rays can also be compensated for or adjusted to a specific value.
  • the six and eight pole correction is weakened.
  • the use of identical lens parts offers advantages, which are explained in more detail below.
  • FIG. 5 shows another embodiment of the lens electrode 26 according to FIG.
  • the opening 43 like the opening 39 in FIG. 3, is essentially octagonal and elongated. However, the long axis of this opening now lies in the plane through the electron beam axes, the intersection line 54 of which is shown with the plane of the drawing.
  • the eight-pole component which is in the focusing lens field through the Edges 32 and 33 arise, substantially balanced.
  • the openings 42 and 44 are substantially pear-shaped. The edge of the openings now diverges outwards.
  • the six-pole component which is created in the focusing lens field by the edges 32 and 33, is essentially compensated through these openings.
  • the different position of the openings in the electrode 26 compared to the position in the electrode 25 is due to the fact that the focusing lens can be regarded as being composed of a positive lens part followed by a weaker negative lens part.
  • the lens becomes stronger in this direction because the positive lens part lies close to the electrode 25.
  • the opening diameter in a certain direction in the electrode 26 By reducing the opening diameter in a certain direction in the electrode 26, the lens becomes weaker in this direction because the negative lens part lies close to the electrode 26. It follows that the opening diameters in the electrodes 25 and 26 have to be changed opposite to each other in order to achieve the same effect.
  • the astigmatism of the electron beams can also be reduced by making the lens electrode parts, between which the lens field is formed in an electron gun, identical.
  • the lens electrode parts must face one another with the corresponding sides and be arranged opposite one another with the corresponding openings.
  • the pear-shaped openings can also be made as indicated in FIG. 6.
  • the straight lines 60, 61, 62, 63 and 64 are again chords of a circle, of which the arches 65, 66 and 67 are still left.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Claims (6)

1. Tube image couleurs comportant une enveloppe vidée d'air qui est constituée par un col, un cône et une fenêtre image, col dans lequel est disposé un système de canons électroniques permettant d'engendrer trois faisceaux d'électrons dont les axes se situent dans un. plan et qui sont focalisés à l'aide d'un champ de lentilles do focalisation sur un écran image realisé sur la face intérieure de la fenêtre image, champ de lentilles de focalisation qui est formé entre deux électrodes du système de canons électroniques disposées l'une derrière l'autre le long des axes, électrodes qui présentent des bords extérieurs s'étendant l'un vers l'autre et à l'intérieur de ces bords sont réalisées, dans une partie enfoncée s'étendant essentiellement perpendiculairement aux axes et d'une façon symétrique par rapport audit plan, trois ouvertures que traversent les faisceaux d'électrons, caractérisé en ce que l'ouverture centrale dans au moins l'une des électrodes est oblongue et formée de façon à obtenir une composante quadripolaire et une composante octopo- laire compensatrice dans le champ de lentilles de focalisation à l'endroit du faisceau d'électrons central et les ouvertures extrêmes dans au moins l'une des électrodes sont formées de façon à obtenir une composante quadripolaire et une composante hexapolaire compensatrice dans le champ de lentilles de focalisation à l'endroit des faisceaux d'électrons extrêmes.
2. Tube image couleurs selon la revendication 1, caractérisé en ce que le bord extérieur dépasse la partie enfoncée d'une distance égale à 10 à 25% du diamètre le plus grand de la partie enfoncée dans le bord extérieur.
3. Tube image couleurs selon la revendication 1 ou 2, caractérisé en ce que vue dans la direction de propagation des faisceaux d'électrons, dans la première des deux électrodes entre lesquelles est formé le champ de lentilles de focalisation, l'ouverture centrale est allongée, son grand axe s'étend perpendiculairement audit plan et le bord de cette ouverture constitue essentiellement un octogone et les ouvertures extrêmes sont en forme de poire, les bords des ouvertures extrêmes, vus à partir de l'ouverture centrale, convergeant vers l'extérieur.
4. Tube image couleurs selon la revendication 1, 2 ou 3, caractérisé en ce que vue dans la direction de propagation des faisceaux d'électrons dans la deuxième des deux électrodes entre lesquelles est formé le champ de lentilles de focalisation, l'ouverture centrale est oblongue et son grand axe se situe dans ledit plan et le bord de cette ouverture constitue essentiellement un octogone et les ouvertures extrêmes sont essentiellement en forme de poire et leurs bords sont divergents, vus à partir de l'ouverture centrale.
5. Tube image couleurs selon la revendication 1, caractérisé en ce que vue dans la direction de propagation des faisceaux d'électrons dans les deux électrodes entre lesquelles est formé le champ de lentilles de focalisation, l'ouverture centrale est oblongue et son grand axe s'étend perpendiculairement audit plan et le bord de cette ouverture constitue essentiellement un octogone et les ouvertures extrêmes sont en forme de poire, les bords convergeant vers l'extérieur, vus à partir de l'ouverture centrale.
6. Tube image couleurs selon la revendication 3, 4 ou 5, caractérisé en ce que vues à partir de l'ouverture centrale, les ouvertures en forme de poire sont formées par des trapèzes isocèles qui convergent vers l'extérieur ou vers l'intérieur et qui sont fermées par des arcs de cercle du côté extérieur et/ou intérieur.
EP84201127A 1983-08-05 1984-08-01 Tube-image couleurs Expired EP0134059B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8302773 1983-08-05
NL8302773A NL8302773A (nl) 1983-08-05 1983-08-05 Kleurenbeeldbuis.

Publications (3)

Publication Number Publication Date
EP0134059A2 EP0134059A2 (fr) 1985-03-13
EP0134059A3 EP0134059A3 (en) 1985-04-10
EP0134059B1 true EP0134059B1 (fr) 1988-10-26

Family

ID=19842237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201127A Expired EP0134059B1 (fr) 1983-08-05 1984-08-01 Tube-image couleurs

Country Status (11)

Country Link
US (1) US4626738A (fr)
EP (1) EP0134059B1 (fr)
JP (1) JPS6054143A (fr)
KR (1) KR920001870B1 (fr)
CA (1) CA1216878A (fr)
DD (1) DD223566A5 (fr)
DE (1) DE3474881D1 (fr)
ES (1) ES8505142A1 (fr)
NL (1) NL8302773A (fr)
PL (1) PL249062A1 (fr)
SG (1) SG52090G (fr)

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FR2724046B1 (fr) 1994-08-26 1996-10-04 Thomson Tubes & Displays Canon a electrons coplanaire a electrodes de focalisation ameliorees
JPH08190877A (ja) 1995-01-09 1996-07-23 Hitachi Ltd 陰極線管
KR970701917A (ko) * 1995-01-13 1997-04-12 요트. 게. 아. 롤페즈 직렬 전자총을 포함하는 색 표시관(Colour display tube comprising an in-line electron gun)
EP0755569B1 (fr) * 1995-02-14 1999-07-21 Koninklijke Philips Electronics N.V. Tube a rayons cathodiques de couleur comprenant un canon electronique en ligne
WO1996035224A1 (fr) * 1995-05-02 1996-11-07 Philips Electronics N.V. Tube image couleur
KR100189609B1 (ko) * 1995-07-28 1999-06-01 구자홍 칼라음극선관용 전자총의 전극구조
JP3779436B2 (ja) * 1997-06-30 2006-05-31 株式会社東芝 カラー陰極線管用電子銃
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Also Published As

Publication number Publication date
KR920001870B1 (ko) 1992-03-06
EP0134059A2 (fr) 1985-03-13
US4626738A (en) 1986-12-02
NL8302773A (nl) 1985-03-01
PL249062A1 (en) 1985-04-09
DD223566A5 (de) 1985-06-12
CA1216878A (fr) 1987-01-20
EP0134059A3 (en) 1985-04-10
JPS6054143A (ja) 1985-03-28
DE3474881D1 (en) 1988-12-01
ES534821A0 (es) 1985-05-01
ES8505142A1 (es) 1985-05-01
JPH053695B2 (fr) 1993-01-18
KR850002161A (ko) 1985-05-06
SG52090G (en) 1990-10-26

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