EP0123611A2 - 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
EP0123611A2
EP0123611A2 EP84400759A EP84400759A EP0123611A2 EP 0123611 A2 EP0123611 A2 EP 0123611A2 EP 84400759 A EP84400759 A EP 84400759A EP 84400759 A EP84400759 A EP 84400759A EP 0123611 A2 EP0123611 A2 EP 0123611A2
Authority
EP
European Patent Office
Prior art keywords
coils
purity
ring
static convergence
coil
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
EP84400759A
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English (en)
French (fr)
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EP0123611A3 (en
EP0123611B1 (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 chromatomas of each triad must not be too far from each other. Indeed, for the eye to have the impression of seeing a white or uniform spot in the presence of three light points of the three primary colors, it is necessary that these light points are sufficiently close to each other. To obtain this result, we arrange for the impacts of the three beams to be superimposed on the screen, in the absence of the mask. 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 several magnets and on the other hand, by correct positioning of the deflector (intended to move the electron beams to carry out the scanning) 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.
  • each p ole is a function of all the corrections to be made.
  • the invention does not have this drawback.
  • each magnetization coil, and / or the core is applied around which it is wound, against said ring.
  • a current of a given intensity in a coil generates a magnet pole having a well-defined 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.
  • the device described in French patent n ° 80 07412 can be used and for the measurement of purity errors, the device described in US patent n ° 4 001 877 can be 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 canon intended for the blue phosphors exclusively reaches the phosphors of this color and, similarly, the guns intended to excite the red and green phosphors respectively produce beams exclusively reaching these phosphors.
  • the magnetic fields produced by the magnets formed in the ring 10 also have the aim 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 device 12 ( Figure 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 one end 15 narrowed around. which is wound a magnet 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 removal 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 dispersions of dimensions 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 entirely 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)
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
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
FR8306832 1983-04-26

Publications (3)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662853A (en) * 1985-03-25 1987-05-05 U.S. Philips Corporation Method of manufacturing a color display tube and device for carrying out said method
FR2606550A1 (fr) * 1986-11-12 1988-05-13 Videocolor Procede et dispositif pour le reglage de la convergence statique et/ou de la purete d'un tube de television en couleurs
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
EP0445815A1 (de) * 1990-03-08 1991-09-11 Kabushiki Kaisha Toshiba Verfahren zur Herstellung einer Farbkathodenstrahlröhren-Einrichtung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
US5969486A (en) * 1997-01-16 1999-10-19 Display Laboratories, Inc. Detecting horizontal blanking time in cathode ray tube devices

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306522A1 (fr) * 1975-04-01 1976-10-29 Philips Nv Procede pour la fabrication d'une unite de convergence statique, et tube d'images en couleur muni d'une unite de convergence fabriquee de la sorte
US4138628A (en) * 1977-07-26 1979-02-06 Rca Corporation Magnetizing method for use with a cathode ray tube
GB2001830A (en) * 1977-07-26 1979-02-07 Rca Corp Static convergence apparatus
DE2907898A1 (de) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing Vielpolige vorrichtung und verfahren zum magnetisieren von ringfoermigen dauermagneten
FR2502386A1 (fr) * 1981-03-17 1982-09-24 Rca Corp Procede et dispositif pour influencer le mouvement de faisceaux d'electrons
EP0062281A1 (de) * 1981-04-03 1982-10-13 International Standard Electric Corporation Verfahren und Vorrichtung zur Ermittlung der Farbreinheits- und der Konvergenzkorrekturgrösse auf einem Farbfernseh-Bildschirm vom In-Line-Typ mit magnetischen Ablenkmitteln

Family Cites Families (4)

* 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
US4001877A (en) * 1975-11-26 1977-01-04 Rca Corporation Method of measuring color purity tolerance of a color display tube
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306522A1 (fr) * 1975-04-01 1976-10-29 Philips Nv Procede pour la fabrication d'une unite de convergence statique, et tube d'images en couleur muni d'une unite de convergence fabriquee de la sorte
US4138628A (en) * 1977-07-26 1979-02-06 Rca Corporation Magnetizing method for use with a cathode ray tube
GB2001830A (en) * 1977-07-26 1979-02-07 Rca Corp Static convergence apparatus
DE2907898A1 (de) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing Vielpolige vorrichtung und verfahren zum magnetisieren von ringfoermigen dauermagneten
FR2502386A1 (fr) * 1981-03-17 1982-09-24 Rca Corp Procede et dispositif pour influencer le mouvement de faisceaux d'electrons
EP0062281A1 (de) * 1981-04-03 1982-10-13 International Standard Electric Corporation Verfahren und Vorrichtung zur Ermittlung der Farbreinheits- und der Konvergenzkorrekturgrösse auf einem Farbfernseh-Bildschirm vom In-Line-Typ mit magnetischen Ablenkmitteln

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662853A (en) * 1985-03-25 1987-05-05 U.S. Philips Corporation Method of manufacturing a color display tube and device for carrying out said method
FR2606550A1 (fr) * 1986-11-12 1988-05-13 Videocolor Procede et dispositif pour le reglage de la convergence statique et/ou de la purete d'un tube de television en couleurs
EP0269504A1 (de) * 1986-11-12 1988-06-01 Videocolor Verfahren und Vorrichtung zur Einstellung der statischen Konvergenz und/oder Reinheit für eine Farbfernsehröhre
US4896071A (en) * 1986-11-12 1990-01-23 Videocolor Method and device for setting the static convergence and/or purity of a color television tube
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
EP0445815A1 (de) * 1990-03-08 1991-09-11 Kabushiki Kaisha Toshiba Verfahren zur Herstellung einer Farbkathodenstrahlröhren-Einrichtung
US5176556A (en) * 1990-03-08 1993-01-05 Kabushiki Kaisha Toshiba Method of manufacturing color cathode ray tube apparatus

Also Published As

Publication number Publication date
EP0123611A3 (en) 1986-03-26
ATE35878T1 (de) 1988-08-15
SG78690G (en) 1991-01-18
HK59492A (en) 1992-08-21
HK3791A (en) 1991-01-18
DE3472856D1 (en) 1988-08-25
FR2545264B1 (fr) 1985-12-13
JPS59205136A (ja) 1984-11-20
FR2545264A1 (fr) 1984-11-02
JPH0542092B2 (de) 1993-06-25
EP0123611B1 (de) 1988-07-20
US4641062A (en) 1987-02-03

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