EP0123611B1 - Verfahren und Vorrichtung zum Einstellen der statischen Konvergenz und der Farbreinheit bei Farbfernsehröhren - Google Patents

Verfahren und Vorrichtung zum Einstellen der statischen Konvergenz und der Farbreinheit bei Farbfernsehröhren Download PDF

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Publication number
EP0123611B1
EP0123611B1 EP84400759A EP84400759A EP0123611B1 EP 0123611 B1 EP0123611 B1 EP 0123611B1 EP 84400759 A EP84400759 A EP 84400759A EP 84400759 A EP84400759 A EP 84400759A EP 0123611 B1 EP0123611 B1 EP 0123611B1
Authority
EP
European Patent Office
Prior art keywords
coils
ring
purity
coil
static convergence
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
EP84400759A
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English (en)
French (fr)
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EP0123611A3 (en
EP0123611A2 (de
Inventor
Claude Pons
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
Application filed by Videocolor SA filed Critical Videocolor SA
Priority to AT84400759T priority Critical patent/ATE35878T1/de
Publication of EP0123611A2 publication Critical patent/EP0123611A2/de
Publication of EP0123611A3 publication Critical patent/EP0123611A3/fr
Application granted granted Critical
Publication of EP0123611B1 publication Critical patent/EP0123611B1/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 method and an apparatus for adjusting the static convergence and / or the purity of color television tubes, in particular of the perforated mask type.
  • a color television tube has a screen on which are deposited luminescent substances (or phosphors) arranged in triads, each point, called luminophore, of this triad, when it is excited, producing an elementary color for example red , green or blue.
  • the excitation is carried out by an electron beam generated by an electron gun assigned to a specific color.
  • the three electron beams have different directions so that the three brushes of these beams which pass through the same opening of the mask have different impacts on the screen, each point of impact being a part of a phosphor, called a chromatoma.
  • the setting of adjusting the direction of each beam so that it only excites the color for which it is intended is called the purity setting.
  • the color reproduction is not necessarily perfect; in addition, the chromatomes of each triad must not be too far from each other. Indeed, so that the eye has the impression of seeing a white or uniform spot in the presence of three light points of the three primary colors, it causes these light points to be sufficiently close to one another. To obtain this result, it is arranged so that the impacts of the three beams are, in the absence of the mask, superimposed on the screen. The setting that achieves this result is called the convergence setting.
  • the purity and convergence settings are obtained on the one hand using constant magnetic fields produced by one or more magnets and, on the other hand, by correct positioning of the deflector (intended to move the electron beams to effect the sweep) relative to the rest of the tube.
  • the adjustment of the purity and of the static convergence (that is to say of the convergence in the center of the screen, without scanning) is carried out using permanent magnets.
  • the invention relates to this type of adjustment.
  • This ring is for example made of a flexible material, called "plastoferrite", which is ferrite embedded in a plastic material.
  • the magnetization intensity that is to say, are created in the magnetizable ring.
  • the magnetic induction of each pole being a function of the set of corrections to be made.
  • the invention does not have this drawback.
  • each coil is integral with a support, or jaw, displaceable perpendicular to the axis of the tube so that, during magnetization, this coil and / or the core around which it is wound -may be applied against the periphery of the magnetizable ring around which it is wound, against said ring.
  • a current of a given intensity in a coil generates a magnet pole having a well-determined induction.
  • This reproducibility facilitates adjustment and enables automation.
  • a preliminary calibration makes it possible to establish, for each type of tube, an abacus indicating the intensity of the current to be supplied, to each coil, to correct a static convergence or purity error, as a function of the value of this error. , whereas with the previously known methods such a calibration is not feasible or is insufficiently precise.
  • each coil is at the end of a jaw.
  • a device is used for measuring errors of purity and static convergence and (the relationship between each error and the current at provide each coil being known by said prior calibration) a calculation means is used so that each coil receives the amount of energy it needs to perform the correction.
  • EP-A-0037766 For the measurement of static convergence errors, the device described in EP-A-0037766 (FR.A.2480032) can be used and for the measurement of purity errors, the device described in US-A patent can be used. 4,001,877.
  • FIG. 1 is a diagram of an apparatus for adjusting purity and static convergence according to the invention.
  • Figure 2 is a diagram of an arrangement in which the apparatus of Figure 1 is used.
  • a flexible and magnetizable ring 10 for example made of plastoferrite, is mounted around the neck 11 of a color television tube.
  • this tube is of the type with a perforated mask and with three cannons in line, that is to say producing three electron beams in the same plane.
  • the ring 10 is intended to be magnetized to produce magnetic fields which deflect the electron beams in order to obtain the purity of the colors, that is to say that the beam of the cannon intended for the blue phosphors exclusively reaches the phosphors of this color and, similarly, the cannons intended to excite the red and green phosphors respectively produce beams exclusively reaching these phosphors.
  • the magnetic camps produced by the magnets formed in the ring 10 also have the purpose of regulating the static convergence, that is to say that they ensure that the three beams, in the absence of scanning, have the same trace in the center of the screen assuming the mask with holes removed.
  • the apparatus 12 (FIG. 1) according to the invention comprises eight jaws 13 each of which is guided radially, that is to say perpendicular to the axis 14 of the tube and has a tapered end 15 around which is wound a magnetization coil 16.
  • the jaws 13 thus have a double function: on the one hand, they make it possible to apply the flexible ring 10 against the periphery of the neck 11 (this ring being however previously glued to the neck 11) and on the other hand, they apply the coils 16 directly against the external surface of the ring 10.
  • the end 15 constitutes a magnetic core. It should be noted that it is not essential to apply the coils against the ring 10; it suffices that the cores 15 are in contact with this ring. But it is preferable, to obtain maximum efficiency, as is the case in the example, that the end of the coil 16 is in contact, at the same time as the end face of the core 15 against the ring 10. In other words, in the example, the end turn of the coil 16 is in the same plane as the end face of the core 15.
  • a device 20 for faults on the screen produces electrical signals which are applied to a computer 21 programmed to supply values of the currents to be supplied to the coils 16 to obtain a resultant action which corrects the faults measured.
  • the program is easy to draw up for those skilled in the art; indeed, a prior calibration makes it possible to determine the relationship existing between the errors of purity and static convergence, measured on the screen, and the currents to be supplied to each coil to obtain the correction of the errors, this calibration being made possible by the elimination of the air gap between the coils 16 and the plastoferrite 10 whereas with the methods used previously, the magnetization coils were fixed, which, taking into account the dimensional dispersions on the diameters of the necks of the tubes and on the dimensions of the rings 10 did not allow precise calibration.
  • the adjustment can be carried out fully automatically, a motor then being provided, with corresponding control means, for approaching and moving the jaws 13 away from the rings 10.

Landscapes

  • 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)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Claims (6)

1. Gerät zur Einstellung der Reinheit und/oder der statischen Konvergenz von Farbfernsehröhren, das mittels Spulen (16) die Bildung von Polen in einem den Hals (11) der Röhre umgebenden magnetisierbaren Ring (10) ermöglicht, dadurch gekennzeichnet, daß jede Spule (16) mit einem Träger (13) oder Spannteil fest verbunden ist und in Bezug auf die Achse (14) der Röhre derart senkrecht verschiebbar ist, daß diese Spule-und/oder der Kern, (15) um welchen sie gewickelt ist-gegen den Umfang des Rings (10) während der Magnetisierung angebracht werden kann.
2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß jede Spule sich an dem Ende (15) des Trägers (13) befindet, wobei dieses Ende von dem obengenannten Kern gebildet wird.
3. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der magnetisierbare Ring (10) aus einem biegsamen Material besteht.
4. Gerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es eine Vorrichtung zur Messung (20) der Fehler der Reinheit oder der statischen Konvergenz auf dem Bildschirm umfaßt, die ein diese Fehler darstellendes Signal abgibt, wobei ein Mittel wie ein programmierter Rechner (21) ein die Intensität der verschiedenen an die Spulen (16) zu liefernden Ströme darstellendes Signal abgibt, um eine die gemessenen Fehler korrigierende resultierende Wirkung zu erhalten, sowie ein Mittel zur Versorgung dieser Spulen aus diesen Signalen.
5. Gerät nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Zahl der Pole, und folglich der Spulen (16), gleich acht ist.
6. Verfahren zur Einstellung der Reinheit oder der statischen Konvergenz einer Farbfernsehröhre, z.B. des Typs mit Lochmaske und mit drei in Reihe liegenden Elektronenstrahlerzeugern, in welchem ein magnetisierbarer Ring (10) durch von Strömen durchflossene Spulen magnetisiert wird, dadurch gekennzeichnet, daß die Verschiebung jeder Spule (16) und/oder jedes Kerns (15), um welchen sie gewickelt ist, einzeln gesteuert wird, so daß jede dieser Spulen (16) oder jeder dieser Kerne (15) gegen den Ring (10) angelegt wird, um die Magnetisierung zu bewirken, wobei die Intensität des an jede Spule (16) gelieferten Stroms von einem Rechner (21) bestimmt wird, welcher einer Vorrichtung (20) zur Messung der Fehler auf dem Bildschirm zugeordnet ist.
EP84400759A 1983-04-26 1984-04-17 Verfahren und Vorrichtung zum Einstellen der statischen Konvergenz und der Farbreinheit bei Farbfernsehröhren Expired EP0123611B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400759T ATE35878T1 (de) 1983-04-26 1984-04-17 Verfahren und vorrichtung zum einstellen der statischen konvergenz und der farbreinheit bei farbfernsehroehren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306832 1983-04-26
FR8306832A FR2545264B1 (fr) 1983-04-26 1983-04-26 Procede et appareil de reglage de la convergence statique et de la purete de tubes de television en couleurs

Publications (3)

Publication Number Publication Date
EP0123611A2 EP0123611A2 (de) 1984-10-31
EP0123611A3 EP0123611A3 (en) 1986-03-26
EP0123611B1 true EP0123611B1 (de) 1988-07-20

Family

ID=9288219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400759A Expired EP0123611B1 (de) 1983-04-26 1984-04-17 Verfahren und Vorrichtung zum Einstellen der statischen Konvergenz und der Farbreinheit bei Farbfernsehröhren

Country Status (8)

Country Link
US (1) US4641062A (de)
EP (1) EP0123611B1 (de)
JP (1) JPS59205136A (de)
AT (1) ATE35878T1 (de)
DE (1) DE3472856D1 (de)
FR (1) FR2545264B1 (de)
HK (2) HK3791A (de)
SG (1) SG78690G (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8500862A (nl) * 1985-03-25 1986-10-16 Philips Nv Werkwijze voor het vervaardigen van een kleurenbeeldbuis en inrichting voor het uitvoeren van deze werkwijze.
FR2606550B1 (fr) * 1986-11-12 1989-01-13 Videocolor Procede et dispositif pour le reglage de la convergence statique et/ou de la purete d'un tube de television en couleurs
FR2611083B1 (fr) * 1987-02-13 1989-05-05 Videocolor Procede de mesure automatique de convergence et de determination des corrections a apporter a des deviateurs pour tubes cathodiques trichromes, et machine de mise en oeuvre
JP2937386B2 (ja) * 1990-03-08 1999-08-23 株式会社東芝 カラー受像管の製造方法
US5146411A (en) * 1990-05-29 1992-09-08 International Business Machines Corporation Computer-aided process for placement of crt trim magnets
IT1245117B (it) * 1991-01-29 1994-09-13 Videocolor Spa Dispositivo di controllo della convergenza statica e della purezza di un tubo a raggi catodici tricromatico
JP3399706B2 (ja) * 1995-08-09 2003-04-21 エヌイーシー三菱電機ビジュアルシステムズ株式会社 カラー陰極線管ディスプレイ装置及びその色純度調整方法
US5869923A (en) * 1996-12-04 1999-02-09 Philips Electronics North America CRT with neck-gripping beam-correcting ferrite-ring assembly
US5969486A (en) * 1997-01-16 1999-10-19 Display Laboratories, Inc. Detecting horizontal blanking time in cathode ray tube devices
US6285397B1 (en) 1997-01-16 2001-09-04 Display Laboratories, Inc. Alignment of cathode ray tube video displays using a host computer processor
US6437829B1 (en) 1997-01-16 2002-08-20 Display Laboratories, Inc. Alignment of cathode ray tube displays using a video graphics controller

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348177A (en) * 1965-12-27 1967-10-17 Zenith Radio Corp Convergence device for color television
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.
US4001877A (en) * 1975-11-26 1977-01-04 Rca Corporation Method of measuring color purity tolerance of a color display tube
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
US4138628A (en) * 1977-07-26 1979-02-06 Rca Corporation Magnetizing method for use with a cathode ray tube
DE2907898A1 (de) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing Vielpolige vorrichtung und verfahren zum magnetisieren von ringfoermigen dauermagneten
JPS563938A (en) * 1979-06-20 1981-01-16 Mitsubishi Electric Corp Magnetizing method of color cathode-ray tube
JPS5615530A (en) * 1979-07-19 1981-02-14 Toshiba Corp Manufacture of color picture tube
US4390815A (en) * 1981-03-17 1983-06-28 Rca Corporation Apparatus for influencing electron beam movement
DE3113454A1 (de) * 1981-04-03 1982-10-21 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren und vorrichtung zur ermittlung der farbreinheits- und der konvergenzkorrekturgroesse auf einem farbfernseh-bildschirm von in-line-typ mit magnetischen ablenkmitteln

Also Published As

Publication number Publication date
SG78690G (en) 1991-01-18
DE3472856D1 (en) 1988-08-25
EP0123611A3 (en) 1986-03-26
JPS59205136A (ja) 1984-11-20
HK59492A (en) 1992-08-21
US4641062A (en) 1987-02-03
JPH0542092B2 (de) 1993-06-25
EP0123611A2 (de) 1984-10-31
HK3791A (en) 1991-01-18
FR2545264A1 (fr) 1984-11-02
ATE35878T1 (de) 1988-08-15
FR2545264B1 (fr) 1985-12-13

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