EP0074891A1 - Vorrichtung zum Einstellen und Befestigen der statischen Konvergenzkorrektureinheit auf den Hals einer Farbfernsehbildröhre - Google Patents

Vorrichtung zum Einstellen und Befestigen der statischen Konvergenzkorrektureinheit auf den Hals einer Farbfernsehbildröhre Download PDF

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Publication number
EP0074891A1
EP0074891A1 EP82401633A EP82401633A EP0074891A1 EP 0074891 A1 EP0074891 A1 EP 0074891A1 EP 82401633 A EP82401633 A EP 82401633A EP 82401633 A EP82401633 A EP 82401633A EP 0074891 A1 EP0074891 A1 EP 0074891A1
Authority
EP
European Patent Office
Prior art keywords
neck
tube
ring
correction unit
convergence correction
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
EP82401633A
Other languages
English (en)
French (fr)
Other versions
EP0074891B1 (de
Inventor
Adriano Venturi
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
Publication of EP0074891A1 publication Critical patent/EP0074891A1/de
Application granted granted Critical
Publication of EP0074891B1 publication Critical patent/EP0074891B1/de
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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • H01J29/823—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements around the neck of the tube
    • H01J29/826—Deflection arrangements

Definitions

  • the subject of the present invention is a method for installing and fixing the unit for correcting static convergences on the neck of a color television tube.
  • the invention also relates to a device allowing the implementation of this method.
  • This adjustment is ensured in a conventional manner by the static convergence correction unit which is constituted by several small magnets whose magnetic fields which interfere make it possible to carry out the desired adjustment.
  • This correction unit is usually placed just behind the tube deflection block. Its positioning on the tube, its precise positioning and the adjustment and maintenance operations associated therewith pose delicate problems which the invention makes it possible to solve in a simple and economical manner.
  • the static convergence correction unit could comprise various adjustable unit elements which were fixed, for example glued, behind the deflection block of the tube. Such a process is long, difficult to industrialize and does not allow adjustments to be made flexible.
  • a ring usually made of a plastic material loaded with ferrite is placed behind the deflection block which can be magnetized in the most suitable way to obtain the desired static convergence corrections.
  • This ring can be split, and in this case, its attachment to the neck of the tube is ensured by tightening by means of an external metal collar.
  • the adjustment operations are not very easy because the magnetization of the ring cannot be done with the metal fixing collar in place.
  • the fact that the ring is split also introduces an air gap unfavorable for a good adjustment.
  • the ring of plastic material loaded with ferrite is not split, which eliminates the problem of the air gap.
  • this introduces a problem difficult to solve of precise positioning of this ring on the neck of the tube, taking into account the manufacturing tolerances in particular of the glass of the tube and of the relatively large and variable clearance existing between the walls of the neck of the tube and of the static convergence correction unit.
  • This axial play is unfavorable both at the level of the realization of the adjustment and at the level of the fixing of the ring on the neck of the tube.
  • the above-mentioned difficulties are resolved by the fact that at least one and preferably two elastic collars mounted in extension are placed on the neck, at the rear of the tube, behind the deflection block. around said neck -and having a small thickness, of the order of 1 to 2 millimeters for example, and one slides over these two collars said static convergence correction unit which is in the form of a cylindrical ring whose the internal diameter is chosen so as to slip with a certain play on said collar and to compress said elastic collars when the correction unit is brought over them to the desired location on said collar, ensuring the precise positioning of said correction unit on the neck of the tube.
  • the desired magnetization of the static convergence correction unit is carried out when the latter is in place on the neck of the tube, which facilitates this operation and makes it easily industrializable.
  • the device for implementing the method of the invention comprises a static convergence correction unit essentially composed of a closed plastic cylindrical ring loaded with ferrite with an inside diameter slightly greater than the outside diameter of the neck of the tube which it must equip , at least one and preferably two elastic collars made of heat-resistant elastomeric material such as silicone rubber having in the rest state a diameter less than the outside diameter of the neck and a thickness section reduced by about one to two millimeters, said device, in the mounting position on the tube, comprising said unit positioned on the neck over said elastic collars compressed between the facing walls of said unit and said neck.
  • FIG. 1 we see the rear part or neck 1 of a color television tube 2 on which we just mounted in any known manner the deflection block 3 whose outer contour has been shown in dotted lines in the figure and of which we have identified in FIGS. 2 and 3 only the rear face 4 against which we have mounted the static convergence correction unit slightly in front of the barrels (not shown) located at inside of the collar at the rear end of the latter.
  • the letters AR mark the rear direction with respect to the front direction marked AV of the tube whose axis has been marked 5.
  • a closed cylindrical ring 6 known per se which can be seen in particular in FIGS. 2 and 4 is used as the static convergence correction unit.
  • This ring is advantageously made of a suitable quality plastic material loaded with ferrite, so that you can create the desired polar magnetic elements to obtain the desired magnetic static convergence correction.
  • two elastic rings or elastic collars of appropriate quality marked 7 and 8 are engaged on the neck 1, behind the deflection block 3, two elastic rings or elastic collars of appropriate quality marked 7 and 8 are engaged.
  • the dimensions of these rings are such that their diameter D (FIG. 5) is in the state much lower than the outside diameter D 2 of a tube neck.
  • D 1 collars 7 and 8 may be of the order of 13 to 26 millimeters.
  • the collars 7 and 8 are positioned on the neck 1 in extension and remain in place of themselves.
  • the mean diameter D 2 of the neck 1 of the tube is 29 millimeters
  • an average inner diameter of the ring 6 of 30 millimeters, which gives a diametral mean clearance of 1 millimeter allowing absorption of the tolerances normal manufacturing.
  • a thickness d of the section of the collars of the order of 1.5 to 2 millimeters, so as to obtain sufficient crushing of these collars during the positioning of the correction unit. static convergences 6.
  • the manufacturing tolerances of the tubes are greater than a millimeter for the value of the diameter of the neck, it will be possible to provide a set of several correction rings 6 having diameters ranging from millimeter to millimeter and l 'We will adapt each time on the neck of the tube the ring of the most suitable dimension, that is to say of the diameter D 3 the smallest but greater than the diameter D 2 of the tube.
  • the collars 7, 8 may be standard collars.
  • the normal thickness e of the ring 6 can be of the order of 1.5 millimeters or more, while the axial length L of the ring varies depending on the type of tube fitted.
  • the ring 6 is placed on the neck 1 of the tube as illustrated in FIG. 2 before magnetization of this ring.
  • FIG. 3 An additional advantage of the invention as illustrated in FIG. 3 results from the fact that it is optionally possible to adapt over the ring 6 an additional correction ring 9 which can be fixed in a conventional manner like a non-magnetic clamp around of this ring.
  • the collar 9 may for example carry small correction magnets.
  • these collars may have a circular section as illustrated.
  • they can be given an elliptical or even rectangular or square section, although the provision of rounded angle sections will generally facilitate the introduction and proper positioning of the ring 6 over the collars.
  • two collars will be used, placed at a distance from each other slightly less than the length L of the ring 6, making it possible to obtain perfect results.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP82401633A 1981-09-16 1982-09-07 Vorrichtung zum Einstellen und Befestigen der statischen Konvergenzkorrektureinheit auf den Hals einer Farbfernsehbildröhre Expired EP0074891B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8117520A FR2513010A1 (fr) 1981-09-16 1981-09-16 Procede et dispositif de mise en place et de fixation de l'unite de correction des convergences statiques sur le col d'un tube de television en couleur
FR8117520 1981-09-16

Publications (2)

Publication Number Publication Date
EP0074891A1 true EP0074891A1 (de) 1983-03-23
EP0074891B1 EP0074891B1 (de) 1986-05-07

Family

ID=9262202

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401633A Expired EP0074891B1 (de) 1981-09-16 1982-09-07 Vorrichtung zum Einstellen und Befestigen der statischen Konvergenzkorrektureinheit auf den Hals einer Farbfernsehbildröhre

Country Status (9)

Country Link
US (1) US4453921A (de)
EP (1) EP0074891B1 (de)
JP (1) JPS5859538A (de)
DE (1) DE3271009D1 (de)
ES (1) ES8306920A1 (de)
FR (1) FR2513010A1 (de)
HK (1) HK94189A (de)
PT (1) PT75485B (de)
SG (1) SG29489G (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568010A (en) * 1995-11-16 1996-10-22 Philips Electronics North America Corporation Cathode ray tube with improved yoke clamp
DE60102531T2 (de) * 2000-09-12 2005-02-03 Thomson Licensing S.A. Vorrichtung zum Korrigieren des statischen Fehlers bei der Strahllandung
JP4901946B2 (ja) * 2009-12-16 2012-03-21 株式会社牧野フライス製作所 滑り案内装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528230A (de) * 1953-04-21
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
US4261017A (en) * 1979-12-27 1981-04-07 Rca Corporation Electron beam influencing apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
US2643373A (en) * 1950-07-21 1953-06-23 Tele King Corp Mounting of cathode-ray tubes for television reception
US4030126A (en) * 1976-01-16 1977-06-14 Gte Sylvania Incorporated Support means for a CRT beam adjustment device
JPS55137650A (en) * 1979-04-16 1980-10-27 Ricoh Co Ltd Cathode ray tube-focusing phototransmission unit array mounting construction
US4338584A (en) * 1980-11-24 1982-07-06 Rca Corporation Television deflection yoke mount

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528230A (de) * 1953-04-21
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
US4261017A (en) * 1979-12-27 1981-04-07 Rca Corporation Electron beam influencing apparatus

Also Published As

Publication number Publication date
ES515727A0 (es) 1983-06-01
PT75485A (fr) 1982-09-01
FR2513010A1 (fr) 1983-03-18
EP0074891B1 (de) 1986-05-07
DE3271009D1 (en) 1986-06-12
US4453921A (en) 1984-06-12
HK94189A (en) 1989-12-08
ES8306920A1 (es) 1983-06-01
FR2513010B1 (de) 1983-10-21
PT75485B (fr) 1984-10-29
SG29489G (en) 1991-01-04
JPS5859538A (ja) 1983-04-08

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