EP0146839B1 - Colour picture tube and method for production and adjustment thereof - Google Patents

Colour picture tube and method for production and adjustment thereof Download PDF

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Publication number
EP0146839B1
EP0146839B1 EP84114760A EP84114760A EP0146839B1 EP 0146839 B1 EP0146839 B1 EP 0146839B1 EP 84114760 A EP84114760 A EP 84114760A EP 84114760 A EP84114760 A EP 84114760A EP 0146839 B1 EP0146839 B1 EP 0146839B1
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EP
European Patent Office
Prior art keywords
deflection unit
electron beams
picture tube
raster
deflection
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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
EP84114760A
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German (de)
French (fr)
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EP0146839A1 (en
Inventor
Eberhard Nill
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.)
Nokia Deutschland GmbH
Original Assignee
Alcatel SEL AG
Standard Elektrik Lorenz AG
Alcatel NV
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Application filed by Alcatel SEL AG, Standard Elektrik Lorenz AG, Alcatel NV filed Critical Alcatel SEL AG
Publication of EP0146839A1 publication Critical patent/EP0146839A1/en
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Publication of EP0146839B1 publication Critical patent/EP0146839B1/en
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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
    • H01J9/42—Measurement or testing during manufacture

Definitions

  • the invention relates to a color picture tube according to the preamble of the main claim and a method for attaching and adjusting a deflection unit to such a color picture tube.
  • a color picture tube which bears a large number of markings on the side of the shadow mask facing the beam generator system. These markings, which also have a strip of phosphorus running in the direction of image deflection, are all arranged in the perforated area of the shadow mask, so that they are struck by the electron beams during normal operation of the color picture tube.
  • the signals generated in this way are scanned through a window in the tube bulb and fed to a correction control system which carries out a convergence and / or geometry adjustment of the displayed image.
  • the invention has for its object to design a color picture tube so that an automatic adjustment of the deflection unit can take place and to specify a suitable method.
  • a color picture tube 19 like a conventional color picture tube, consists of a glass tube bulb 9, a screen 8, a shadow mask 7 of the slit or shadow mask type, a glass tube neck 25 and three jet generator systems 1, 2 mounted in the tube neck , 3.
  • an opaque inner coating 10 is attached on the inside of the tube bulb 9, an opaque inner coating 10 is attached.
  • a deflection unit 18 is attached to the outside of the color picture tube 19 at the transition from the tube neck 25 to the tube bulb 9. Electron beams 4, 5, 6 emanate from the beam generator systems 1, 2, 3, which are deflected in the region of the deflection unit 18 and which are intended to intersect in the holes in the shadow mask 7.
  • the color picture tube 19 also has at least one opening 11 in the inner coating 10.
  • the changes to the shadow mask 7 compared to a conventional one are further explained with reference to FIG. 2.
  • the rear view of the shadow mask 7 of the color picture tube 19 is shown.
  • the shadow mask 7 is attached to the front of a frame 16.
  • the edges of the shadow mask 7 are covered on the back by the frame 16.
  • There are markings 13a, 13b, 14a, 14b which run in the direction of the image deflection and which consist of a material which emits visible or UV light when an electron beam strikes it.
  • the markings preferably consist of phosphor strips.
  • the markings 13a, 13b, 14a are applied on the frame 16 and the marking 14b on a marking carrier 17 attached thereon. It is also possible to make markings directly on the shadow mask 7 in its edge region, which, however, must not be shadowed by the frame 16 for the electron beams 4, 5, 6.
  • the type and placement of markings should be selected so that a specific error to be corrected can be identified.
  • the openings 11 in the inner coating 10 of the tube bulb 9 and the associated photosensitive elements 12, on the other hand, are to be selected such that the largest possible part of the light emanating from the markings can be received from each photosensitive element 12 and that each of any part of one Mark outgoing flash of light from at least one photosensitive element 12 is receivable. Whether a photosensitive element 12 is permanently attached or whether such is only applied temporarily, for example by fitting a corresponding test head, depends primarily on whether one-off adjustment work or regular checks are carried out with the aid of the light received by this photosensitive element 12 should.
  • the markings 13a, 13b, 14a, 14b are applied to the frame 16 or the marking carrier 17 in such a way that they are struck by electron beams whose imaginary extensions extend the four centers of the edges of the image screen 8 meet. This makes it possible, in particular, to check the convergence at the four center sides.
  • a color picture tube is usually described with a grid that extends only a few percent on all sides beyond the edge of the screen and thus also beyond the perforated part of the shadow mask.
  • the markings 13 and 14 which serve to correct the convergence lie outside this range, since a larger grid is written during the adjustment of the color picture tube.
  • the correct fit of the deflection unit can be checked well. Not only can the deflection unit be adjusted very well, the adjustment process can also be largely automated.
  • the deflection unit 18 is usually attached and adjusted to the color picture tube 19 in such a way that the deflection unit 18 is first preassembled on the tube bulb 9 at the transition to the tube neck 25 and that the color picture tube 19 with the deflection unit 18 is then put into operation such that A grid is written to electron beams. Thereafter, the deflection unit 18 is first shifted on the tube neck 25 of the picture tube 19 such that the electron beams 4, 5, 6 of the three beam generator systems 1, 2, 3 converge in the center of the screen. The deflection unit 28 is then rotated about an axis running in the direction of the line deflection such that the electron beams 4, 5, 6 converge in the middle of the upper and lower raster edges.
  • the deflection unit 18 is then rotated about an axis running in the direction of the image deflection in such a way that the electron beams 4, 5, 6 converge in the middle of the right and left raster edges.
  • the convergence is usually determined by a test person by checking whether, in the presence of only a single electron beam, only the associated color is present everywhere. If necessary, the process is repeated.
  • the deflection unit 18 is then immovably connected to the color picture tube 19.
  • this method is modified in such a way that, at least during the setting of the convergence, the grid is written in such capital that the markings 13a, 13b, 14a, 14b are also overwritten by the grid.
  • the grid is not written by all jet generator systems 1, 2 and 3 at the same time, but only by one.
  • the times that the electron beams need to reach the respective marking 13a, 13b, 14a, 14b from the raster edge on the left when viewing the screen are then measured. An exact adjustment is achieved when all electron beams need the same length to reach a certain marking from the left raster edge. Depending on which electron beam arrives earlier and how big the time difference is, one has to change more or less in one or the other direction.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Description

Die Erfindung betrifft eine Farbbildröhre nach dem Oberbegriff des Hauptanspruchs und ein Verfahren zum Anbringen und Justieren einer Ablenkeinheit an eine derartige Farbbildröhre.The invention relates to a color picture tube according to the preamble of the main claim and a method for attaching and adjusting a deflection unit to such a color picture tube.

Die Anforderungen, die an die Wiedergabetreue von Farbbildröhren gestellt werden, sind vor allem durch häufigere Wiedergabe von Graphiken und Texten stark angestiegen. Durch selbstkonvergente Ablenksysteme und durch vielfältige Schaltungsmassnahmen ist bereits eine hohe Wiedergabetreue erreicht. Eine weitere Erhöhung der Wiedergabetreue ist dann möglich, wenn individuelle Fehler ausgeglichen werden. Dies setzt voraus, dass solche Abweichungen so genau wie möglich festgestellt werden können.The demands placed on the fidelity of color picture tubes have increased significantly, particularly as a result of the frequent reproduction of graphics and texts. A high level of fidelity has already been achieved through self-converging deflection systems and a variety of switching measures. A further increase in fidelity is possible if individual errors are compensated for. This presupposes that such deviations can be determined as accurately as possible.

Aus der D E-A 1 -3 225 278 ist eine Farbbildröhre bekannt, die auf der dem Strahlerzeugersystem zugewandten Seite der Schattenmaske eine Vielzahl von Markierungen trägt. Diese auch einen in Richtung der Bildablenkung verlaufenden Streifen aus Phosphor aufweisende Markierungen sind alle im gelochten Bereich der Schattenmaske angeordnet, so dass sie im normalen Betrieb der Farbbildröhre von den Elektronenstrahlen getroffen werden. Die dadurch erzeugten Signale werden durch ein Fenster im Röhrenkolben abgetastet und einem Korrekturregelsystem zugeführt, das eine Konvergenz- und/oder Geometriejustierung des angezeigten Bildes vornimmt.From DE-A 1 -3 225 278 a color picture tube is known which bears a large number of markings on the side of the shadow mask facing the beam generator system. These markings, which also have a strip of phosphorus running in the direction of image deflection, are all arranged in the perforated area of the shadow mask, so that they are struck by the electron beams during normal operation of the color picture tube. The signals generated in this way are scanned through a window in the tube bulb and fed to a correction control system which carries out a convergence and / or geometry adjustment of the displayed image.

Aus der EP-A1-0 021 275 ist eine Vorrichtung zum Einstellen der Ablenkeinheit einer Farbbildröhre bekannt, die manuell bedient wird.From EP-A1-0 021 275 a device for adjusting the deflection unit of a color picture tube is known, which is operated manually.

Der Erfindung liegt die Aufgabe zugrunde, eine Farbbildröhre so auszugestalten, dass eine automatische Justierung der Ablenkeinheit erfolgen kann und ein dafür geeignetes Verfahren anzugeben.The invention has for its object to design a color picture tube so that an automatic adjustment of the deflection unit can take place and to specify a suitable method.

Die Lösung dieser Aufgabe erfolgt durch die im Anspruch 1 bzw. Anspruch 3 angegebenen Merkmale. Eine vorteilhafte Ausgestaltung ist im Anspruch 2 enthalten. Die Farbbildröhre und ihre Ablenkeinheit sind so genau wie möglich aufeinander ausgerichtet. Das Verfahren gibt an, wie bei der erfindungsgemässen Farbbildröhre möglichst gut und einfach justiert werden kann.This object is achieved by the features specified in claim 1 and claim 3. An advantageous embodiment is contained in claim 2. The color picture tube and its deflection unit are aligned as precisely as possible. The method specifies how the color picture tube according to the invention can be adjusted as well and easily as possible.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen unter Zuhilfenahme der beiliegenden Zeichnung weiter erläutert.

  • Fig. zeigt den Schnitt durch die Farbbildröhre und
  • Fig. 2 zeigt schematisch die Lochmaske der Farbbildröhre von hinten.
In the following, the invention is further explained on the basis of exemplary embodiments with the aid of the attached drawing.
  • Fig. Shows the section through the color picture tube and
  • Fig. 2 shows schematically the shadow mask of the color picture tube from behind.

Eine erfindungsgemässe Farbbildröhre 19 besteht, wie Fig. 1 zeigt, ebenso wie eine herkömmliche Farbbildröhre aus einem gläsernen Röhrenkolben 9, einem Bildschirm 8, einer Schattenmaske 7 vom Typ Schlitz- oder Lochmaske, einem gläsernen Röhrenhals 25 und drei im Röhrenhals angebrachten Strahlerzeugersystemen 1, 2, 3. Auf der Innenseite des Röhrenkolbens 9 ist eine undurchsichtige Innenbeschichtung 10 angebracht. An der Aussenseite der Farbbildröhre 19 ist am Übergang vom Röhrenhals 25 zum Röhrenkolben 9 eine Ablenkeinheit 18 befestigt. Von den Strahlerzeugersystemen 1, 2, 3 gehen Elektronenstrahlen 4, 5, 6 aus, die im Bereich der Ablenkeinheit 18 abgelenkt werden und die sich in den Löchern der Schattenmaske 7 schneiden sollen. Die Farbbildröhre 19 weist darüberhinaus mindestens eine Öffnung 11 in der Innenbeschichtung 10 auf. An jeder Stelle des Röhrenkolbens 9, an der an der Innenseite eine Öffnung 11 in der Innenbeschichtung 10 angebracht ist, besteht auf der Aussenseite die Möglichkeit zum Anbringen eines lichtempfindlichen Elements 12, das so angebracht oder anbringbar ist, dass das auf die zugehörige Öffnung 11 fallende Licht registrierbar ist. Dieses Licht kommt von auf der Schattenmaske 7, die in Fig. 1 nur sehr schematisch dargestellt ist, anqeordneten Markierungen.As shown in FIG. 1, a color picture tube 19 according to the invention, like a conventional color picture tube, consists of a glass tube bulb 9, a screen 8, a shadow mask 7 of the slit or shadow mask type, a glass tube neck 25 and three jet generator systems 1, 2 mounted in the tube neck , 3. On the inside of the tube bulb 9, an opaque inner coating 10 is attached. A deflection unit 18 is attached to the outside of the color picture tube 19 at the transition from the tube neck 25 to the tube bulb 9. Electron beams 4, 5, 6 emanate from the beam generator systems 1, 2, 3, which are deflected in the region of the deflection unit 18 and which are intended to intersect in the holes in the shadow mask 7. The color picture tube 19 also has at least one opening 11 in the inner coating 10. At any point of the tube bulb 9, at which an opening 11 is made in the inner coating 10 on the inside, there is the possibility on the outside of attaching a photosensitive element 12, which is attached or can be attached in such a way that that falling on the associated opening 11 Light can be registered. This light comes from marks arranged on the shadow mask 7, which is shown only very schematically in FIG. 1.

Anhand von Fig. 2 werden die Änderungen an der Schattenmaske 7 gegenüber einer herkömmlichen weiter erläutert. Gezeigt ist die Rückansicht der Schattenmaske 7 der Farbbildröhre 19. Die Schattenmaske 7 ist an der Vorderseite eines Rahmens 16 angebracht. Die Ränder der Schattenmaske 7 sind rückseitig durch den Rahmen 16 verdeckt. Es sind in Richtung der Bildablenkung verlaufende Markierungen 13a, 13b, 14a, 14b vorhanden, die aus einem solchen Material bestehen, das beim Auftreffen eines Elektronenstrahls sichtbares oder UV-Licht abgibt.The changes to the shadow mask 7 compared to a conventional one are further explained with reference to FIG. 2. The rear view of the shadow mask 7 of the color picture tube 19 is shown. The shadow mask 7 is attached to the front of a frame 16. The edges of the shadow mask 7 are covered on the back by the frame 16. There are markings 13a, 13b, 14a, 14b which run in the direction of the image deflection and which consist of a material which emits visible or UV light when an electron beam strikes it.

Vorzugsweise bestehen die Markierungen aus Phosphorstreifen. Im gezeigten Beispiel sind die Markierungen 13a, 13b, 14a auf dem Rahmen 16 und die Markierung 14b auf einem darauf angebrachten Markierungsträger 17 aufgebracht. Es ist auch möglich, Markierungen unmittelbar auf die Schattenmaske 7 in deren Randbereich anzubringen, der jedoch für die Elektronenstrahlen 4, 5, 6 nicht durch den Rahmen 16 abgeschattet sein darf.The markings preferably consist of phosphor strips. In the example shown, the markings 13a, 13b, 14a are applied on the frame 16 and the marking 14b on a marking carrier 17 attached thereon. It is also possible to make markings directly on the shadow mask 7 in its edge region, which, however, must not be shadowed by the frame 16 for the electron beams 4, 5, 6.

Die Art und Anbringung von Markierungen ist so zu wählen, dass damit jeweils ein bestimmter zu korrigierender Fehler erkennbar wird. Die Öffnungen 11 in der Innenbeschichtung 10 des Röhrenkolbens 9 und die zugehörigen lichtempfindlichen Elemente 12 sind dagegen so zu wählen, dass von jedem lichtempfindlichen Element 12 aus ein möglichst grosser Teil des von den Markierungen ausgehenden Lichts empfangen werden kann und dass jeder von irgend einem Teil einer Markierung ausgehenden Lichtblitz von mindestens einem lichtempfindlichen Element 12 aufnehmbar ist. Ob ein lichtempfindliches Element 12 fest angebracht ist oder ob ein solches, beispielsweise durch Aufsetzen eines entsprechenden Prüfkopfs, nur vorübergehend aufgebracht wird, hängt in erster Linie davon ab, ob mit Hilfe des von diesem lichtempfindlichen Element 12 empfangenen Lichts einmalige Abgleicharbeiten oder regelmässig wiederkehrende Kontrollen erfolgen sollen.The type and placement of markings should be selected so that a specific error to be corrected can be identified. The openings 11 in the inner coating 10 of the tube bulb 9 and the associated photosensitive elements 12, on the other hand, are to be selected such that the largest possible part of the light emanating from the markings can be received from each photosensitive element 12 and that each of any part of one Mark outgoing flash of light from at least one photosensitive element 12 is receivable. Whether a photosensitive element 12 is permanently attached or whether such is only applied temporarily, for example by fitting a corresponding test head, depends primarily on whether one-off adjustment work or regular checks are carried out with the aid of the light received by this photosensitive element 12 should.

Die Markierungen 13a, 13b, 14a, 14b sind so auf dem Rahmen 16 bzw. dem Markierungsträger 17 aufgebracht, dass sie von solchen Elektronenstrahlen getroffen werden, deren gedachte Verlängerungen die vier Mitten der Ränder des Bildschirms 8 treffen. Damit ist insbesondere eine Überprüfung der Konvergenz an den vier Seitenmitten möglich.The markings 13a, 13b, 14a, 14b are applied to the frame 16 or the marking carrier 17 in such a way that they are struck by electron beams whose imaginary extensions extend the four centers of the edges of the image screen 8 meet. This makes it possible, in particular, to check the convergence at the four center sides.

Eine Farbbildröhre wird normalerweise mit einem Raster beschrieben, das nach allen Seiten nur um wenige Prozent über den Bildschirmrand und damit auch über den gelochten Teil der Schattenmaske hinausreicht. Die der Korrektur der Konvergenz dienenden Markierungen 13 und 14 liegen ausserhalb dieses Bereichs, da während der Justierung der Farbbildröhre ein grösseres Raster geschrieben wird.A color picture tube is usually described with a grid that extends only a few percent on all sides beyond the edge of the screen and thus also beyond the perforated part of the shadow mask. The markings 13 and 14 which serve to correct the convergence lie outside this range, since a larger grid is written during the adjustment of the color picture tube.

Bei der Farbbildröhre 19, die Markierungen, 13a, 13b, 14a, 14b aufweist, mit denen die Konvergenz an den Mitten der Ränder des Bildschirms überprüfbar ist, kann der richtige Sitz der Ablenkeinheit gut kontrolliert werden. Damit kann die Ablenkeinheit nicht nur sehr gut justiert werden, der Justiervorgang kann auch weitgehend automatisiert werden.With the color picture tube 19, which has markings 13a, 13b, 14a, 14b, with which the convergence at the center of the edges of the screen can be checked, the correct fit of the deflection unit can be checked well. Not only can the deflection unit be adjusted very well, the adjustment process can also be largely automated.

Das Anbringen und Justieren der Ablenkeinheit 18 an die Farbbildröhre 19 erfolgt üblicherweise so, dass die Ablenkeinheit 18 zunächst auf den Röhrenkolben 9 am Übergang zum Röhrenhals 25 vormontiert wird und dass dann die Farbbildröhre 19 mit der Ablenkeinheit 18 so in Betrieb genommen wird, dass von den Elektronenstrahlen ein Raster geschrieben wird. Danach wird zunächst die Ablenkeinheit 18 auf dem Röhrenhals 25 der Bildröhre 19 so verschoben, dass in der Bildschirmmitte die Elektronenstrahlen 4, 5, 6 der drei Strahlerzeugersysteme 1, 2, 3 konvergieren. Danach wird die Ablenkeinheit 28 um eine in Richtung der Zeilenablenkung verlaufende Achse so gedreht, dass in der Mitte des oberen und unteren Rasterrands die Elektronenstrahlen 4, 5, 6 konvergieren. Anschliessend wird die Ablenkeinheit 18 um eine in Richtung der Bildablenkung verlaufende Achse so gedreht, dass in der Mitte des rechten und linken Rasterrands die Elektronenstrahlen 4, 5, 6 konvergieren. Die Konvergenz wird, meist durch eine Prüfperson, dadurch festgestellt, dass überprüft wird, ob beim Vorhandensein nur eines einzigen Elektronenstrahls überall auch nur die zugehörige Farbe vorhanden ist. Gegebenenfalls wird der Vorgang wiederholt. Anschliessend wird die Ablenkeinheit 18 unverrückbar mit der Farbbildröhre 19 verbunden.The deflection unit 18 is usually attached and adjusted to the color picture tube 19 in such a way that the deflection unit 18 is first preassembled on the tube bulb 9 at the transition to the tube neck 25 and that the color picture tube 19 with the deflection unit 18 is then put into operation such that A grid is written to electron beams. Thereafter, the deflection unit 18 is first shifted on the tube neck 25 of the picture tube 19 such that the electron beams 4, 5, 6 of the three beam generator systems 1, 2, 3 converge in the center of the screen. The deflection unit 28 is then rotated about an axis running in the direction of the line deflection such that the electron beams 4, 5, 6 converge in the middle of the upper and lower raster edges. The deflection unit 18 is then rotated about an axis running in the direction of the image deflection in such a way that the electron beams 4, 5, 6 converge in the middle of the right and left raster edges. The convergence is usually determined by a test person by checking whether, in the presence of only a single electron beam, only the associated color is present everywhere. If necessary, the process is repeated. The deflection unit 18 is then immovably connected to the color picture tube 19.

Bei der Farbbildröhre 19 wird dieses Verfahren so abgewandelt, dass das Raster zumindest während der Einstellung der Konvergenz so gross geschrieben wird, dass die Markierungen 13a, 13b, 14a, 14b mit vom Raster überschrieben werden. Das Raster wird nicht von allen Strahlerzeugersystemen 1, 2 und 3 gleichzeitig geschrieben, sondern nur von jeweils einem. Zur Kontrolle genügt die Verwendung von zwei der drei Strahlerzeugersysteme, vorwiegend der beiden äusseren für rot und blau. Es werden dann die Zeiten gemessen, die die Elektronenstrahlen brauchen, um vom beim Betrachten des Bildschirms linken Rasterrand zu der jeweiligen Markierung 13a, 13b, 14a, 14b zu gelangen. Eine exakte Justierung ist dann erreicht, wenn alle Elektronenstrahlen gleich lang brauchen, um vom linken Rasterrand zu einer bestimmten Markierung zu gelangen. Je nach dem, welcher Elektronenstrahl früher ankommt und wie gross die Zeitdifferenz ist, muss in der einen oder in der anderen Richtung mehr oder weniger verändert werden.In the case of the color picture tube 19, this method is modified in such a way that, at least during the setting of the convergence, the grid is written in such capital that the markings 13a, 13b, 14a, 14b are also overwritten by the grid. The grid is not written by all jet generator systems 1, 2 and 3 at the same time, but only by one. As a control, it is sufficient to use two of the three jet generator systems, mainly the two outer ones for red and blue. The times that the electron beams need to reach the respective marking 13a, 13b, 14a, 14b from the raster edge on the left when viewing the screen are then measured. An exact adjustment is achieved when all electron beams need the same length to reach a certain marking from the left raster edge. Depending on which electron beam arrives earlier and how big the time difference is, one has to change more or less in one or the other direction.

Claims (3)

1. Colour picture tube comprising three electron-gun systems for producing electron beams, one quadrilateral (slit or) shadow mask having upon it, on the side facing the beam-generating systems, markings of phosphor strips running in the direction of the picture deflection, a screen and a glass bulb with a non-transparent interior coating which, at least at one point, has an opening opposite which, on the outside of the bulb, there is attached a photo-sensitive element capable of detecting the visible or ultraviolet light from the markings falling on the opening upon the impingement of the electron beams, characterized in that the markings (13a, b, 14a, b) are in each case present in the middle on the sides of the edge of the shadow mask (7) surrounding the perforated area outside the raster written by the electron beams during normal operation.
2. A colour picture tube as claimed in Claim 1, characterized in that said marks (13a, b, 14a, b) are arranged on the holder (16) of said shadow mask.
3. A method of attaching and adjusting a deflection unit to a colour picture tube as claimed in any one of Claims 1 or 2, in which the deflection unit is first premounted on the bulb, in which the colour picture tube together with the premounted deflection unit is put into operation in such a way that the electron beams write a raster, in which the deflection unit is displaced in such a way on the longitudinal axis of the bulb that the electron beams converge in the centre of the screen, in which the deflection unit is turned about an axis running in the direction of the line deflection in such a way that the electron beams converge in the centre of the upper and the lower raster edge, in which the deflection unit is turned about an axis running in the direction of the picture deflection in such a way that the electron beams converge in the centre of the right-hand and the left-hand raster edge, and in which the deflection unit, thereafter, is irremovably connected to the colour picture tube, characterized in that the raster, at least during the convergence adjustment, is written so large at the picture edges that the vertical marks (13a, b, 14a, b) are writtenover as well, that, in succession, the times are measured which the electron-beams (4, 5, 6) coming from the various electron-gun systems (1, 2, 3) require for passing from the left-hand raster edge, viewed looking at the screen, to the respective mark (13a, b, 14a, b), and that the differences between the measured times are evaluated as a measure of both the amount and the kind of deviation from convergence and the deflection unit is turned until all the electron beams require the same length of time to pass from the left-hand raster edge to a certain marking.
EP84114760A 1983-12-22 1984-12-04 Colour picture tube and method for production and adjustment thereof Expired EP0146839B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3346361 1983-12-22
DE19833346361 DE3346361A1 (en) 1983-12-22 1983-12-22 COLOR IMAGE TUBES AND METHOD FOR THEIR PRODUCTION AND ADJUSTMENT

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EP0146839A1 EP0146839A1 (en) 1985-07-03
EP0146839B1 true EP0146839B1 (en) 1988-06-01

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EP84114760A Expired EP0146839B1 (en) 1983-12-22 1984-12-04 Colour picture tube and method for production and adjustment thereof

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US (1) US4659957A (en)
EP (1) EP0146839B1 (en)
JP (1) JPS60157145A (en)
CA (1) CA1220508A (en)
DE (2) DE3346361A1 (en)

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Publication number Priority date Publication date Assignee Title
JP2565881B2 (en) * 1985-12-09 1996-12-18 株式会社東芝 Color picture tube device
US4748371A (en) * 1987-02-10 1988-05-31 Rca Licensing Corporation Cathode-ray tube shadow mask for low overscan

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Publication number Priority date Publication date Assignee Title
NL7610353A (en) * 1976-09-17 1978-03-21 Philips Nv METHOD OF APPLYING REFERENCE POINTS FOR THE MAGNETIC DEFLECTION OF A COLOR IMAGE TUBE, DEVICE FOR PERFORMING SUCH METHOD AND IMAGE TUBE FITTING REFERENCE POINTS ACCORDING TO THE METHOD OR WITH THE DEVICE.
US4456853A (en) * 1981-07-06 1984-06-26 Tektronix, Inc. Feedback CRT for use in a closed-loop correction system

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US4659957A (en) 1987-04-21
CA1220508A (en) 1987-04-14
JPS60157145A (en) 1985-08-17
DE3346361A1 (en) 1985-07-04
EP0146839A1 (en) 1985-07-03
DE3471811D1 (en) 1988-07-07

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