EP0095617A2 - Tube-image couleurs comprenant des moyens de correction des défauts de torsion - Google Patents

Tube-image couleurs comprenant des moyens de correction des défauts de torsion Download PDF

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Publication number
EP0095617A2
EP0095617A2 EP83104638A EP83104638A EP0095617A2 EP 0095617 A2 EP0095617 A2 EP 0095617A2 EP 83104638 A EP83104638 A EP 83104638A EP 83104638 A EP83104638 A EP 83104638A EP 0095617 A2 EP0095617 A2 EP 0095617A2
Authority
EP
European Patent Office
Prior art keywords
correction
magnets
electron beam
correction magnets
electron
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.)
Granted
Application number
EP83104638A
Other languages
German (de)
English (en)
Other versions
EP0095617A3 (en
EP0095617B1 (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.)
Panasonic Holdings Corp
Original Assignee
Alcatel SEL AG
Standard Elektrik Lorenz AG
Alcatel NV
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 Alcatel SEL AG, Standard Elektrik Lorenz AG, Alcatel NV, International Standard Electric Corp filed Critical Alcatel SEL AG
Publication of EP0095617A2 publication Critical patent/EP0095617A2/fr
Publication of EP0095617A3 publication Critical patent/EP0095617A3/de
Application granted granted Critical
Publication of EP0095617B1 publication Critical patent/EP0095617B1/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
    • H01J29/70—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
    • 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
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
    • 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 color picture tube consisting of a screen trough, a cone and HaLs, in which the screen trough is provided with a fluorescent screen and a mask and in which an electron beam generator system with at least one correction magnet is arranged in the HaLs.
  • the screen image is generated by horizontally and vertically deflecting three electron beams which meet in the plane of the mask provided with openings, the electron beams passing through the openings in different directions and the ones assigned to them, arranged on the one behind the mask Luminous screen next to each other - stimulate lying fluorescent areas.
  • the static convergence of the color picture tube is set when the three electron beams run without a deflection field in such a way that they hit the center of the mask together.
  • Static color purity is present when the electron beams hit the fluorescent areas of the fluorescent screen assigned to them at the correct angle through the openings in the mask.
  • Dynamic convergence and color purity are maintained when the joint is distracted Electron beams through the magnetic field of the deflection unit, color purity and convergence are present on the entire fluorescent screen.
  • Modern combinations of color picture tube and deflection unit are self-convergent, i.e. they are designed so that dynamic convergence and color purity are guaranteed without additional correction currents in the deflection coils of the deflection unit.
  • this is done, for example, with a ring made of easily magnetizable permanent magnet material, which is located just behind the deflection unit above or in the electron gun system.
  • the ring is magnetized on its circumference so multipolar that the electron beams experience the necessary corrective deflections.
  • twist error which consists in the fact that the lines written by the three electron beams when deflected via the screen are inclined towards one another with the aid of the multipole magnetized ring mentioned above, does not succeed because at the same time with the reduction of the Twist errors other dynamic errors arise.
  • This is very disadvantageous because it is therefore not possible to effectively eliminate the twist error, so that color picture tubes with such mounting sensors have to be reworked in such a way that a new electron gun system is used.
  • the object of the invention is to provide an inexpensive device for correcting twist errors.
  • Claims 2 to 5 indicate advantageous embodiments of the invention.
  • the electron beams to be corrected are deflected by additional correction magnets before entering the magnetic field of the deflection unit and before passing through the correction fields for color purity and convergence.
  • correction magnets are attached near the external electron beams and magnetized so that the electron beams are directed in different directions Can be steered, that is, from the plane in which the three electron gun systems lie.
  • the middle electron beam should not be influenced by the correction magnets.
  • the magnetization of the correction magnets in the color tube production can take place on the same machine on which other correction magnets are also set.
  • a ring of magnetizing coils with strongly bundled magnetic fields is arranged displaceably in the direction of the longitudinal axis of the color picture tube at the location of the correction magnets to be magnetized.
  • the effect of the magnetizations is measured with the help of sensors arranged in front of the fluorescent screen and then the magnetization of the correction magnets continues until they have the required magnetization.
  • the color picture tube in Figure 1 consists of the screen trough 7 with the fluorescent screen 1 and the mask 2, the cone 6 and the HaLs 5 and has the electron gun system 3, which is located in the picture 5 of the color picture tube.
  • the electron gun system is shown enlarged in Figure 2. It has a correction magnet 10 for the correction of color purity and convergence and a correction magnet 11 which makes this correction free of twist errors.
  • FIG. 3 shows the course of a dashed line of an electron beam that is only convergent-corrected with a correction magnet 10 and is dash-dotted Course of an electron beam corrected for convergence with two correction magnets 10 and 11 without twist errors.
  • the course shown in broken lines arises when a correction magnet 10 is present.
  • the course drawn in dash-dot lines occurs when the correction magnet 11 is arranged in addition to the correction magnet 10.
  • the course of an electron beam that does not require correction up to the correction magnet 10 is shown in dotted lines.
  • the convergence correction takes place with the correction magnet 10 arranged at the level of the line 12.
  • the twist error-free convergence correction is prepared by a further correction magnet 11 which is located at the line 13.
  • FIG. 4 shows how the deflection takes place without the correction magnets 11.
  • FIG. 5 shows how, by means of the correction parameters 11 according to the invention, which lie in a plane containing the cutting line 13, the dashed-dotted, initially still incorrect course of an electron beam is directed towards the plane 19.
  • the deflection of the electron beam into the plane 19 is effected by the correction magnet 10, which is located in the plane containing the cutting line 12.
  • the corrected electron beam then runs on the now correct, dash-dotted path into the magnetic field of the deflection unit and thus does not cause any dynamic distortions during deflection.
  • the dashed line corresponds to the course of an electron beam corrected only by a correction magnet 10.
  • the dotted line corresponds to the course of an electron beam that does not require correction.
  • FIG. 6 shows an exemplary embodiment for the arrangement and configuration of the correction magnets 11.
  • the openings 20, through which the external electron beams enter the grating 3, lie in the area of influence of the correction magnets 11, which can be I, U, or E-shaped . They are preferably fixed in the lower part 21 of the grid 3 of the electron beam generator system in a non-positive or positive manner.
  • the correction magnets 10 are provided in the middle part 22 of the grating 3.
  • FIG. 7 shows an exemplary embodiment with U-shaped correction magnets 11
  • FIG. 8 shows an E-shaped correction magnet.
  • the correction magnets 11 can also be attached to the outside of the grating 3.
  • a corresponding arrangement on the grid 2, inside or outside, is also possible.
  • FIG. 10 gives an example of the closely adjacent attachment of correction magnets 10 inside the grid 3 in the form of clips and the correction magnets 11 outside on the grid 3 as a U-shaped bow.
  • the shape of the correction magnets can be seen from FIGS. 11 and 12: FIG. 11 is the section AB in FIG. 10 and FIG. 12 shows the section CD of FIG. 10.
  • FIG. 13 is the representation of a construction with correction magnets 10 in two planes and a correction magnet 11 in one plane.
  • section AB of FIG. 13 which is shown in FIG. 14, correction magnets 10 divided by air gaps are inserted into the central part of the grating 3, while in FIG. 15 the section CD of FIG. 13 is I-shaped Correction magnets 11 shows, in which two basic forms of magnetization are symbolically illustrated.
  • the magnetization with three magnetic poles shown on the left causes the electron beam to shift perpendicular to the plane of the electron beams, while the magnetization indicated with two magnetic poles on the right in FIG. 15 causes the neighboring electron beam to be deflected in the horizontal direction.
  • one or both of the outer electron gun systems may twist from the intended level.
  • the deflection unit is aligned precisely with the horizontal position of this plane so that twisted electron beams with positional deviations enter the magnetic field of the deflection unit.
  • a twist angle a is created, which leads to dynamic convergence errors.
  • the twist error is eliminated by the magnetization of the correction magnet 11 according to the invention alternating with the magnetization of the correction magnet 10.
  • the dosing of the twist correction is done by the different magnetization of the correction magnets. If the electron beam path is influenced in this way, this course is bent twice. This not only corrects the direction of the course, but also the position of the electron beam.
  • a simultaneous correction of the course of the two outer electron beams is possible and desirable, but is not absolutely necessary because of the already satisfactorily good effect in the case of asymmetrical correction. Influencing an external beam may be sufficient, i.e. the correspondingly dimensioned two-pole field of a correction magnet 11 with a suitable arrangement for the electron beam is sufficient.
  • correction magnet (s) 11 are arranged in the beam generator system, e.g. Correction magnets 11 used in the form of pieces of wire, which are preferably attached to the bottom of the inner edge of grid 3.
  • the magnetization coils that are already present for the magnetization of the correction magnets 10 can be used to magnetize the wire pieces, which are temporarily brought to the height of the correction magnets 11 on the electron gun system.
  • magnetic brackets provided with one or more air gaps can also be used if the magnetizing coils can be used to achieve a narrowly confined, that is to say sharply localized, magnetization of the magnetic brackets near the external beams.
  • Pieces of wire or brackets are attached to the grid 3 in a non-positive or positive manner inside or outside.
  • the shape of the correction magnets and their geometric position on the longitudinal axis of the electron gun system depends on the properties of the relevant color picture tube type and can also deviate from the exemplary embodiment shown in FIG.
  • Correction magnets 11 can, for example, also be located in the upper part 23 of the grating 3 if the correction magnets 10 are located in the grating 4, the so-called convergence pot.
  • correction magnets 11 are low, so that all color picture tubes can be equipped with the correction magnets 11 during their manufacture. In this way, more than half of the scrap due to twist errors, which would make it necessary to reread an electron gun system, can be avoided.
  • the magnetization of the correction magnets 11 must take place in such a way that the magnetic field of the correction magnet influencing the adjacent external beam runs in the plane of the electron beams.
  • the magnetic field of the correction magnet at the location of the electron beam then shifts it out of the plane, as shown in Fig. 15 left side.
  • a magnetization of the correction magnet, as indicated on the right in FIG. 15, creates a magnetic field perpendicular to the plane of the electron beams at the location of the adjacent external beam.
  • the resulting displacement of the outer beam in question thus takes place in the plane of the electron beams, which then also supports the color purity and convergence correction.
  • the electron beam is displaced in any direction, so that deflection of the outer electron beams can be achieved in all directions between vertical and horizontal.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP83104638A 1982-05-27 1983-05-11 Tube-image couleurs comprenant des moyens de correction des défauts de torsion Expired EP0095617B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823219954 DE3219954A1 (de) 1982-05-27 1982-05-27 Farbbildroehre mit twistkorrektur
DE3219954 1982-05-27

Publications (3)

Publication Number Publication Date
EP0095617A2 true EP0095617A2 (fr) 1983-12-07
EP0095617A3 EP0095617A3 (en) 1984-10-17
EP0095617B1 EP0095617B1 (fr) 1987-11-19

Family

ID=6164634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104638A Expired EP0095617B1 (fr) 1982-05-27 1983-05-11 Tube-image couleurs comprenant des moyens de correction des défauts de torsion

Country Status (5)

Country Link
US (1) US4625144A (fr)
EP (1) EP0095617B1 (fr)
JP (1) JPS58218732A (fr)
CA (2) CA1206321A (fr)
DE (2) DE3219954A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633598A1 (fr) * 1993-07-06 1995-01-11 Matsushita Electronics Corporation Tube cathodique couleur

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2728212B2 (ja) * 1988-11-22 1998-03-18 株式会社日立製作所 カラーブラウン管装置
US5233267A (en) * 1989-10-03 1993-08-03 Matsushita Electronics Corporation Dynamic convergence system for color cathode ray tubes having an in line electron gun
JP2945688B2 (ja) * 1989-10-03 1999-09-06 松下電子工業株式会社 カラー受像管装置
US5557164A (en) * 1995-03-15 1996-09-17 Chunghwa Picture Tubes, Ltd. Cathode ray tube with misconvergence compensation
KR100596229B1 (ko) * 1998-09-29 2006-09-20 엘지전자 주식회사 컬러 음극선관 전자총

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1912271A1 (de) * 1968-03-11 1969-10-02 Sony Corp Farbbildroehre
FR2313832A1 (fr) * 1975-06-06 1976-12-31 Videon Sa Procede et dispositif d'elimination des defauts de groupement des faisceaux electroniques dans un tube cathodique couleur a canons coplanaires
FR2345805A1 (fr) * 1976-03-25 1977-10-21 Philips Nv Tube image de television en couleur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5559637A (en) * 1978-10-30 1980-05-06 Hitachi Ltd Magnetic focus cathode ray tube
DE3003197A1 (de) * 1980-01-30 1981-08-06 Standard Elektrik Lorenz Ag, 7000 Stuttgart Vorrichtung zum einstellen der elektronenstrahlen einer farbbildroehre
GB2079530B (en) * 1980-07-02 1985-04-11 Hitachi Ltd Magnetic focussing arrangement in a cathode ray tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1912271A1 (de) * 1968-03-11 1969-10-02 Sony Corp Farbbildroehre
FR2313832A1 (fr) * 1975-06-06 1976-12-31 Videon Sa Procede et dispositif d'elimination des defauts de groupement des faisceaux electroniques dans un tube cathodique couleur a canons coplanaires
FR2345805A1 (fr) * 1976-03-25 1977-10-21 Philips Nv Tube image de television en couleur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633598A1 (fr) * 1993-07-06 1995-01-11 Matsushita Electronics Corporation Tube cathodique couleur
US5530315A (en) * 1993-07-06 1996-06-25 Matsushita Electronics Corporation Color cathode ray tube having magnetic members for mitigating effects of an external magnetic field along an axial direction of the in-line election gun

Also Published As

Publication number Publication date
DE3219954A1 (de) 1983-12-01
CA1202059A (fr) 1986-03-18
EP0095617A3 (en) 1984-10-17
CA1206321A (fr) 1986-06-24
DE3374625D1 (en) 1987-12-23
JPS58218732A (ja) 1983-12-20
US4625144A (en) 1986-11-25
EP0095617B1 (fr) 1987-11-19

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