EP0137373B1 - Electron gun for multiple cathode ray tubes such as colour picture tubes - Google Patents
Electron gun for multiple cathode ray tubes such as colour picture tubes Download PDFInfo
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- EP0137373B1 EP0137373B1 EP84111219A EP84111219A EP0137373B1 EP 0137373 B1 EP0137373 B1 EP 0137373B1 EP 84111219 A EP84111219 A EP 84111219A EP 84111219 A EP84111219 A EP 84111219A EP 0137373 B1 EP0137373 B1 EP 0137373B1
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- 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
- H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
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- the invention relates to an electron beam generation system for multiple cathode ray tubes, such as color picture tubes, with cathodes and a plurality of electrodes which follow one another and lie one behind the other in the electron beam direction, at least one of which has a substantially greater spatial dimension in the electron beam direction than the other electrodes and consists of at least two segments and in which the electrodes are made of different materials.
- At least the first three electrodes are made of different materials when viewed in the beam direction.
- the coefficients of thermal expansion of the materials of the electrodes are increasingly staggered from the cathode to the screen such that the changes in distance in the beam direction between the adjacent openings of the electrodes, through which the electron beams pass, decrease linearly when the electrode beam generation system is at operating temperature.
- This measure ensures that the voltages occurring in the electron beam generating system as a result of its heating to such high temperatures are as low as possible and that the electron-optical lenses present between the electrodes can have the most undisturbed effect on the electron beams.
- the offset between an electrode opening in the electrode G3 of an external electron beam and the corresponding electrode opening in the Electrode G4 with a center distance of the electrode openings of 6.6 mm is approximately 1.5 ⁇ m.
- the displacement of the light spots generated by the two outer electron beams in a color picture tube with each other, that is, the red and blue light spots then thus amounts to about 0.4 mm in the center of the screen. This is a clearly visible t misconvergence.
- any remaining misconvergence in the steady state of the color picture tube i.e. when their electron gun has reached operating temperature, can be corrected in a known manner with a convergence unit.
- this misconvergence that occurs during the heating phase is of course undesirable.
- the object on which the invention is based is therefore to further develop the known electron beam generation system in such a way that the least possible offset between the electrodes occurs in the heating phase and that any offset that does occur is below the interference limit.
- the electrodes G2 and G4 adjacent to the larger electrode G3 and the segments of the larger electrode G3 adjacent to these electrodes consist of materials with different coefficients of thermal expansion such that the material of the electrode segment adjacent to electrode G4 has a smaller coefficient of thermal expansion than that Material of the electrode G4 and the material of the electrode segment adjacent to the electrode G2 has a greater or the same coefficient of thermal expansion than the material of the electrode G2.
- the electron gun is designed in this way, there will be less offset between the electrodes during its heating-up period and / or the period in which misconvergence will occur due to the offset is shorter than in the known electron gun systems, so that the convergence correction required is less is and can be done much sooner.
- FIGS. 1 to 3 A “unitized gun” electron beam generating system for a “inline” color picture tube is illustrated in FIGS. 1 to 3.
- Such an electron beam generation system has - as can be clearly seen from FIG. 3 - an approximately rectangular cross section and, arranged parallel to one another on a line, contains three electron beam generation systems which are each intended to excite the red, green and blue light spots on the screen of the color picture tube.
- the electron gun has three individual cathodes 1 and electrodes G1, G2, G3 and G4.
- the electrodes consist either of individual (G1, G2 and G4) or of several, composite, pot-shaped metal bodies with an edge, which are melted into the glass rods 3 either at the edges or on additional holding parts 2 connected to the electrodes or segments.
- the electrode G3 has the greatest length of all electrodes and is composed of the electrode segments 4, 5, 6 and 7.
- further electrode segments 8 and 9 are present within the electrode segments 6 and 7.
- the electrode segments forming the electrode G3 are connected to one another in a non-positive and / or positive manner. As a rule, the connection is made by spot welding.
- the electrodes are provided with openings through which the electron beams emanating from the cathodes 1 pass on their way to the screen.
- the openings in the same electrode or in the same electrode segment are arranged on a line next to one another and at the same distance from one another, as illustrated in FIG. 3. This distance at room temperature is denoted by Q.
- the openings of different electrodes have a different diameter; however, they are arranged concentrically to a common axis of symmetry. Since the electrodes have different electrical potentials during operation of the color picture tube, electron-optical lenses are formed between them, which influence the path of the electron beams.
- the invention deals with the changes in the electron-optical lenses due to the different expansions of the electrodes during the heating phase of the electrode beam generation system to the operating temperature, which lead to the misconvergences already mentioned at the beginning.
- the cathodes have a temperature of approximately 760 ° C. in the operating state.
- the electrode G2 has a temperature of approximately 150 ° C, the electrode segment 4 a temperature of approximately 100 ° C, the electrode segment 7 a temperature of approximately 85 ° C and the electrode G4 a temperature of approximately 70 ° C.
- the convergence errors in the heating phase of the color picture tube can be very greatly reduced if different materials are used for the electrodes G4 and G2 and the electrode segments 7 and 4 in the manner according to the invention. Materials are used which have a coefficient of thermal expansion between 1.0 x 10- 5 ° C -1 and 1.7 x 10- 5 ° C- 'at the application temperatures between 20 ° C and 150 ° C.
- an austenitic stainless steel As a material with the coefficient of thermal expansion of 1.7 x 10- 5 ° C- 1, an austenitic stainless steel has in embodiments been found suitable, of the 16-20 wt .-% Cr, 8-12 wt .-% Ni and remainder iron. This material is not ferromagnetic at room temperature.
- a series of austenitic steels are useful whose thermal expansion coefficient is 1.7 to 1.9 x 10- 5 ° C-. 1
- a nickel-chromium-iron alloy can be used, which, from 72 wt .-% Ni 14-21 wt .-% CR and max 10% FE.
- alloys which contain approximately 80% by weight of Ni and approximately 20% by weight of Cr or whose composition consists of approximately 65% by weight of Ni, approximately 30% by weight of Cr and a maximum 1 wt .-% Fe exists. These alloys are also not ferromagnetic at room temperature.
- Materials which are ferromagnetic at room temperature such as an alloy of 48-54% by weight of Ni, a maximum of 2% by weight of Cr and the rest of Fe or with approximately 72% by weight of Fe and can also be used for the electrode G2 approx. 28% by weight Cr.
- the electrode segment 7 consists of a material with 80% by weight Ni and 20% by weight Cr, then the electrode segments 4, 5 and 6 can consist of an austenitic chromium-nickel steel.
- electrode segments 7 and 9 are formed in several parts, such as the part of the electrode G3 consisting of the electrode segments 7, 8 and 9, then it is advantageous if all the electrode segments consist of the same material. However, it is possible that there are only slight deviations if the electrode segments 8 and 9 are made from a material with a slightly different temperature expansion coefficient than that of the electrode segment 7 from a material with> 72% by weight Ni, 14-21% by weight. % Cr and> 10 wt .-% Fe and the electrode segments 8 and 9 consist of an austenitic chromium-nickel steel.
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Description
Die Erfindung betrifft ein Elektronenstrahlerzeugungssystem für Mehrfachkathodenstrahlröhren, wie Farbbildröhren, mit Kathoden und mehreren auf diese folgenden, in Elektronenstrahlrichtung hintereinander liegenden Elektroden, von denen wenigstens eine eine wesentlich stärkere räumliche Ausdehnung in Elektronenstrahlrichtung als die anderen Elektroden aufweist und aus wenigstens zwei Segmenten besteht und bei dem die Elektroden aus verschiedenen Werkstoffen bestehen.The invention relates to an electron beam generation system for multiple cathode ray tubes, such as color picture tubes, with cathodes and a plurality of electrodes which follow one another and lie one behind the other in the electron beam direction, at least one of which has a substantially greater spatial dimension in the electron beam direction than the other electrodes and consists of at least two segments and in which the electrodes are made of different materials.
Ein solches Elektronenstrahlerzeugungssystem ist bekannt (DE-PS 29 20 151).Such an electron gun is known (DE-PS 29 20 151).
Bei dem bekannten Elektronenstrahlerzeugungssystem sind wenigstens die ersten drei Elektroden in Strahlrichtung gesehen aus verschiedenen Werkstoffen hergestellt. Die Temperaturausdehnungskoeffizienten der Werkstoffe der Elektroden sind von der Kathode zum Bildschirm hin derart zunehmend gestaffelt, dass die Abstandsänderungen in Strahlrichtung zwischen den nebeneinander liegenden Öffnungen der Elektroden, durch welche die Elektronenstrahlen hindurchtreten, linear abnehmen, wenn sich das Elektrodenstrahlerzeugungssystem auf Betriebstemperatur befindet.In the known electron gun system, at least the first three electrodes are made of different materials when viewed in the beam direction. The coefficients of thermal expansion of the materials of the electrodes are increasingly staggered from the cathode to the screen such that the changes in distance in the beam direction between the adjacent openings of the electrodes, through which the electron beams pass, decrease linearly when the electrode beam generation system is at operating temperature.
Durch diese Massnahme wird erreicht, dass die in dem Elektronenstrahlerzeugungssystem infolge seiner Aufheizung auf solche hohen Temperaturen auftretenden Spannungen möglichst gering sind und auch die zwischen den Elektroden vorhandenen elektronenoptischen Linsen eine möglichst ungestörte Wirkung auf die Elektronenstrahlen ausüben können.This measure ensures that the voltages occurring in the electron beam generating system as a result of its heating to such high temperatures are as low as possible and that the electron-optical lenses present between the electrodes can have the most undisturbed effect on the electron beams.
Diese bekannten Elektronenstrahlerzeugungssysteme haben sich in der Praxis auch bewährt. Jedoch sollten die von den Elektronenstrahlen in einer Farbbildröhre erzeugten Bilder nicht nur im Betriebszustand der Farbbildröhre konvergent sein, sondern nach Möglichkeit schon kurze Zeit nach Inbetriebsetzen der Farbbildröhre. Die Anheizphase kann bei einer Farbbildröhre mehrere Minuten dauern. Es ist beobachtet worden, dass in dieser Anheizphase der Farbbildröhre sehr auffällige Misskonvergenzen auftreten.These known electron gun systems have also proven themselves in practice. However, the images generated by the electron beams in a color picture tube should not only be convergent in the operating state of the color picture tube, but if possible shortly after the color picture tube has been started up. With a color picture tube, the heating phase can take several minutes. It has been observed that very noticeable misconvergences occur during this heating phase of the color picture tube.
Diese Misskonvergenzen sind darauf zurückzuführen, dass in der Anheizphase der Farbbildröhre infolge der unterschiedlichen Ausdehnungsgeschwindigkeiten der Werkstoffe ein zeitweilig auftretender Versatz zwischen den Elektroden G3 und G4 auftritt. Dies führt zu einer Verzerrung der elektronenoptischen Linse zwischen G3 und G4.These misconvergences are due to the fact that a temporary offset occurs between electrodes G3 and G4 in the heating phase of the color picture tube due to the different rates of expansion of the materials. This leads to distortion of the electron optical lens between G3 and G4.
Es wurde festgestellt, dass bei einem «Inline»-Elektronenstrahlerzeugungssystem mit «unitized guns», bei dem die entsprechenden Elektroden aller drei Elektronenstrahlen in einem Körper vereint sind, der Versatz zwischen einer Elektrodenöffnung in der Elektrode G3 eines aussenliegenden Elektronenstrahls und der entsprechende Elektrodenöffnung in der Elektrode G4 bei einem Mittenabstand der Elektrodenöffnungen von 6,6 mm etwa 1,5 µm beträgt. Dies hat die Verschiebung des von einem durch diese Öffnungen hindurchtretenden Elektronenstrahls im Zentrum des Bildschirms einer 68,6 cm (27")-Röhre erzeugten Leuchtflecks zum benachbarten Leuchtfleck von etwa 0,2 mm bei einer Spannung von 18 kV zwischen den Elektroden G3 und G4 zur Folge. Die Verschiebung der von den beiden äusseren Elektronenstrahlen einer Farbbildröhre erzeugten Leuchtflecken zueinander, d.h. der roten und blauen Leuchtflecken, beträgt dann also etwa 0,4 mm in der Bildschirmmitte. Das ist eine deutlich t sichtbare Misskonvergenz.It was found that in an "inline" electron gun with "unitized guns" in which the corresponding electrodes of all three electron beams are combined in one body, the offset between an electrode opening in the electrode G3 of an external electron beam and the corresponding electrode opening in the Electrode G4 with a center distance of the electrode openings of 6.6 mm is approximately 1.5 µm. This has the shift of the light spot generated by an electron beam passing through these openings in the center of the screen of a 68.6 cm (27 ") tube to the neighboring light spot of about 0.2 mm at a voltage of 18 kV between the electrodes G3 and G4 result. the displacement of the light spots generated by the two outer electron beams in a color picture tube with each other, that is, the red and blue light spots, then thus amounts to about 0.4 mm in the center of the screen. This is a clearly visible t misconvergence.
Eine etwa verbleibende restliche Misskonvergenz im eingeschwungenen Zustand der Farbbildröhre, d.h. wenn deren Elektronenstrahlerzeugungssystem Betriebstemperatur erreicht hat, kann in bekannter Weise mit einer Konvergenzeinheit korrigiert werden. Da es jedoch bis zu dreissig Minuten dauern kann, bis eine Farbbildröhre Betriebstemperatur erreicht hat, ist diese in der Aufheizphase auftretende Misskonvergenz natürlich unerwünscht.Any remaining misconvergence in the steady state of the color picture tube, i.e. when their electron gun has reached operating temperature, can be corrected in a known manner with a convergence unit. However, since it can take up to thirty minutes for a color picture tube to reach operating temperature, this misconvergence that occurs during the heating phase is of course undesirable.
Die der Erfindung zugrunde liegende Aufgabe besteht deshalb darin, das bekannte Elektronenstrahlerzeugungssystem in der Weise weiter zu entwickeln, dass in der Aufheizphase ein möglichst geringer Versatz zwischen den Elektroden eintritt und dass ein etwa doch auftretender Versatz dem Betrag nach unterhalb der Störgrenze liegt.The object on which the invention is based is therefore to further develop the known electron beam generation system in such a way that the least possible offset between the electrodes occurs in the heating phase and that any offset that does occur is below the interference limit.
Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass die der grösseren Elektrode G3 benachbarten Elektroden G2 und G4 sowie die diesen Elektroden benachbarten Segmente der grösseren Elektrode G3 derart aus Werkstoffen mit unterschiedlichem Temperaturausdehnungskoeffizienten bestehen, dass der Werkstoff des der Elektrode G4 benachbarten Elektrodensegmentes einen kleineren Temperaturausdehnungskoeffizienten als der Werkstoff der Elektrode G4 und der Werkstoff des der Elektrode G2 benachbarten Elektrodensegmentes einen grösseren oder den gleichen Temperaturausdehnungskoeffizienten als der Werkstoff der Elektrode G2 aufweist.This object is achieved according to the invention in that the electrodes G2 and G4 adjacent to the larger electrode G3 and the segments of the larger electrode G3 adjacent to these electrodes consist of materials with different coefficients of thermal expansion such that the material of the electrode segment adjacent to electrode G4 has a smaller coefficient of thermal expansion than that Material of the electrode G4 and the material of the electrode segment adjacent to the electrode G2 has a greater or the same coefficient of thermal expansion than the material of the electrode G2.
Wenn das Elektronenstrahlerzeugungssystem in dieser Weise ausgeführt ist, dann tritt während seiner Aufheizzeit ein geringerer Versatz zwischen den Elektroden auf und/oder die Zeitspanne, in der infolge des Versatzes eine Misskonvergenz auftritt, ist kürzer als bei den bekannten Elektronenstrahlerzeugungssystemen, so dass die erforderliche Konvergenzkorrektur geringer ist und wesentlich eher vorgenommen werden kann.If the electron gun is designed in this way, there will be less offset between the electrodes during its heating-up period and / or the period in which misconvergence will occur due to the offset is shorter than in the known electron gun systems, so that the convergence correction required is less is and can be done much sooner.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 11 enthalten. Sie ist nachstehend anhand der Figuren 1 bis 3 erläutert. Es zeigen:
- Fig. 1 ein «unitized gun»-Elektronenstrahlerzeugungssystem schematisch im Längsschnitt, entlang der grösseren Achse des Rechtecks geschnitten,
- Fig. 2 das Elektronenstrahlerzeugungssystem gemäss Fig. 1, entlang der kleineren Achse des Rechtecks geschnitten und
- Fig. 3 den Querschnitt des Elektronenstrahlerzeugungssystems gemäss Fig. 1, entlang der Linie AB in Fig. 2 geschnitten.
- 1 schematically shows a «unitized gun» electron beam generating system in longitudinal section, cut along the larger axis of the rectangle,
- Fig. 2, the electron gun according to Fig. 1, cut along the smaller axis of the rectangle and
- 3 shows the cross section of the electron gun according to FIG. 1, cut along the line AB in FIG. 2.
In den Figuren 1 bis 3 ist ein sogenanntes «unitized gun» - Elektronenstrahlerzeugungssystem für eine sogenannte «inline»-Farbbildröhre verdeutlicht. Ein solches Elektronenstrahlerzeugungssystem weist - wie aus Fig. 3 deutlich erkennbar - einen etwa rechteckigen Querschnitt auf und enthält, parallel zueinander auf einer Linie angeordnet, drei Elektronenstrahlerzeugungssysteme, welche jeweils die roten, grünen und blauen Leuchtflecke auf dem Bildschirm der Farbbildröhre erregen sollen.A “unitized gun” electron beam generating system for a “inline” color picture tube is illustrated in FIGS. 1 to 3. Such an electron beam generation system has - as can be clearly seen from FIG. 3 - an approximately rectangular cross section and, arranged parallel to one another on a line, contains three electron beam generation systems which are each intended to excite the red, green and blue light spots on the screen of the color picture tube.
Das Elektronenstrahlerzeugungssystem besitzt drei einzelne Kathoden 1 und die Elektroden G1, G2, G3 und G4. Die Elektroden bestehen entweder aus einzelnen (G1, G2 und G4) oder aus mehreren, zusammengesetzten, topfförmigen, einen Rand aufweisenden Metallkörpern, welche entweder an den Rändern oder an zusätzlichen, mit den Elektroden oder Segmenten verbundenen Halterungsteilen 2 in die Glasstäbe 3 eingeschmolzen sind. Die Elektrode G3 weist die grösste Länge von allen Elektroden auf und ist aus den Elektrodensegmenten 4, 5, 6 und 7 zusammengesetzt. Ausserdem sind innerhalb der Elektrodensegmente 6 und 7 weitere Elektrodensegmente 8 und 9 vorhanden. Die die Elektrode G3 bildenden Elektrodensegmente sind kraft-und/oder formschlüssig miteinander verbunden. In der Regel erfolgt die Verbindung durch Punktschweissen.The electron gun has three individual cathodes 1 and electrodes G1, G2, G3 and G4. The electrodes consist either of individual (G1, G2 and G4) or of several, composite, pot-shaped metal bodies with an edge, which are melted into the
Wie aus den Figuren erkennbar, sind die Elektroden mit Öffnungen versehen, durch welche die von den Kathoden 1 ausgehenden Elektronenstrahlen auf ihrem Weg zum Bildschirm hindurchtreten. Die Öffnungen, in der gleichen Elektrode bzw. in dem gleichen Elektrodensegment sind auf einer Linie nebeneinander und in gleichem Abstand zueinander angeordnet, wie Fig. 3 verdeutlicht. Dieser Abstand bei Raumtemperatur sei mit Q bezeichnet. Die Öffnungen von verschiedenen Elektroden besitzen einen unterschiedlichen Durchmesser; sie sind jedoch konzentrisch zu einer gemeinsamen Symmetrieachse angeordnet. Da die Elektroden beim Betrieb der Farbbildröhre unterschiedliche elektrische Potentiale besitzen, entstehen zwischen ihnen elektronenoptische Linsen, welche den Weg der Elektronenstrahlen beeinflussen.As can be seen from the figures, the electrodes are provided with openings through which the electron beams emanating from the cathodes 1 pass on their way to the screen. The openings in the same electrode or in the same electrode segment are arranged on a line next to one another and at the same distance from one another, as illustrated in FIG. 3. This distance at room temperature is denoted by Q. The openings of different electrodes have a different diameter; however, they are arranged concentrically to a common axis of symmetry. Since the electrodes have different electrical potentials during operation of the color picture tube, electron-optical lenses are formed between them, which influence the path of the electron beams.
Die Erfindung befasst sich mit den Veränderungen der elektronenoptischen Linsen durch die unterschiedliche Ausdehnungen der Elektroden während der Aufheizphase des Elektrodenstrahlerzeugungssystems auf Betriebstemperatur, welche zu den eingangs bereits erwähnten Misskonvergenzen führen.The invention deals with the changes in the electron-optical lenses due to the different expansions of the electrodes during the heating phase of the electrode beam generation system to the operating temperature, which lead to the misconvergences already mentioned at the beginning.
Als Beispiel sei erwähnt, dass bei einer heute üblichen Farbfernsehröhre mit einer Heizleistung von etwa 4,4 Watt, im Betriebszustand die Kathoden eine Temperatur von ca. 760 °C aufweisen. Die Elektrode G2 hat eine Temperatur von ca. 150 °C, das Elektrodensegment 4 eine Temperatur von ca. 100 °C, das Elektrodensegment 7 eine Temperatur von ca. 85 °C und die Elektrode G4 eine Temperatur von ca. 70 °C.As an example, it should be mentioned that in a color television tube with a heating power of approximately 4.4 watts which is common today, the cathodes have a temperature of approximately 760 ° C. in the operating state. The electrode G2 has a temperature of approximately 150 ° C, the electrode segment 4 a temperature of approximately 100 ° C, the electrode segment 7 a temperature of approximately 85 ° C and the electrode G4 a temperature of approximately 70 ° C.
Die Konvergenzfehler in der Aufheizphase der Farbbildröhre können sehr stark vermindert werden, wenn für die Elektroden G4 und G2 sowie die Elektrodensegmente 7 und 4 in erfindungsgemässer Weise unterschiedliche Werkstoffe verwendet werden. Dabei werden Werkstoffe eingesetzt, welche bei den Verwendungstemperaturen zwischen 20 °C und 150 °C Temperaturausdehnungskoeffizienten zwischen 1,0 x 10-5 °C-1 und 1,7 x 10-5 °C-' aufweisen.The convergence errors in the heating phase of the color picture tube can be very greatly reduced if different materials are used for the electrodes G4 and G2 and the electrode segments 7 and 4 in the manner according to the invention. Materials are used which have a coefficient of thermal expansion between 1.0 x 10- 5 ° C -1 and 1.7 x 10- 5 ° C- 'at the application temperatures between 20 ° C and 150 ° C.
Als Werkstoff mit dem Temperaturausdehnungskoeffizienten 1,7 x 10-5 °C-1 hat sich in Ausführungsbeispielen ein austenitischer Chromnickelstahl als geeignet erwiesen, der 16-20 Gew.-% Cr, 8-12 Gew.-% Ni und Rest Eisen enthält. Dieser Werkstoff ist bei Zimmertemperatur nicht ferromagnetisch. Für diejenigen Elektroden oder Elektrodensegmente, welche aus einem Werkstoff mit dem höheren Temperaturausdehnungskoeffizienten bestehen, sind eine Reihe von austenitischen Stählen brauchbar, deren Temperaturausdehnungskoeffizient zwischen 1,7 und 1,9 x 10-5 °C-1 liegt.As a material with the coefficient of thermal expansion of 1.7 x 10- 5 ° C- 1, an austenitic stainless steel has in embodiments been found suitable, of the 16-20 wt .-% Cr, 8-12 wt .-% Ni and remainder iron. This material is not ferromagnetic at room temperature. For those electrodes or electrode segments, which consist of a material having the higher thermal expansion coefficient, a series of austenitic steels are useful whose thermal expansion coefficient is 1.7 to 1.9 x 10- 5 ° C-. 1
Als Werkstoff mit dem Temperaturausdehnungskoeffizienten 1,5 x 10-5 °C-1, wie er beispielsweise für die Elektrode G2 und das Elektrodensegment 7 vorgeschlagen ist, kann eine Nikkel-Chrom-Eisenlegierung verwendet werden, welche aus 72 Gew.-% Ni, 14-21 Gew.-% CR und max 10% FE besteht. Es sind aber auch solche Legierungen brauchbar, die ca. 80 Gew.-% Ni und ca. 20 Gew.-% Cr enthalten oder deren Zusammensetzung aus ca. 65 Gew.-% Ni, ca. 30 Gew.-% Cr und maximal 1 Gew.-% Fe besteht. Diese Legierungen sind gleichfalls bei Zimmertemperatur nicht ferromagnetisch. Für die Elektrode G2 können auch Werkstoffe verwendet werden, die bei Zimmertemperatur ferromagnetisch sind, wie eine Legierung aus 48-54 Gew.-% Ni, maximal 2 Gew.-% Cr und Rest Fe oder mit ca. 72 Gew.-% Fe und ca. 28 Gew.-% Cr.As a material of the thermal expansion coefficient 1.5 x 10- 5 ° C- 1, as is proposed, for example for the electrode G2 and the electrode segment 7, a nickel-chromium-iron alloy can be used, which, from 72 wt .-% Ni 14-21 wt .-% CR and max 10% FE. However, it is also possible to use alloys which contain approximately 80% by weight of Ni and approximately 20% by weight of Cr or whose composition consists of approximately 65% by weight of Ni, approximately 30% by weight of Cr and a maximum 1 wt .-% Fe exists. These alloys are also not ferromagnetic at room temperature. Materials which are ferromagnetic at room temperature, such as an alloy of 48-54% by weight of Ni, a maximum of 2% by weight of Cr and the rest of Fe or with approximately 72% by weight of Fe and can also be used for the electrode G2 approx. 28% by weight Cr.
Wenn das Elektrodensegment 7 aus einem Werkstoff mit 80 Gew.-% Ni und 20 Gew.-% Cr besteht, dann können die Elektrodensegmente 4, 5 und 6 aus einem austenitischen Chromnickelstahl bestehen.If the electrode segment 7 consists of a material with 80% by weight Ni and 20% by weight Cr, then the electrode segments 4, 5 and 6 can consist of an austenitic chromium-nickel steel.
Falls einzelne Elektrodensegmente mehrteilig ausgebildet sind, wie beispielsweise das aus den Elektrodensegmenten 7, 8 und 9 bestehende Teil der Elektrode G3, dann ist es vorteilhaft, wenn alle Elektrodensegmente, aus dem gleichen Werkstoff bestehen. Es ist jedoch möglich, dass sich nur geringe Abweichungen ergeben, wenn die Elektrodensegmente 8 und 9 aus einem Werkstoff mit geringfügig anderem Temperatur-Ausdehnungskoeffizienten als der des Elektrodensegmentes 7 aus einem Werkstoff mit > 72 Gew.-% Ni, 14-21 Gew.-% Cr und > 10 Gew.-% Fe und die Elektrodensegmente 8 und 9 aus einem austenitischen Chromnickelstähl bestehen.
Claims (11)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3334242 | 1983-09-22 | ||
| DE19833334242 DE3334242A1 (en) | 1983-09-22 | 1983-09-22 | ELECTRONIC RADIATOR GENERATION SYSTEM FOR MULTIPLE-CATHODE RAY TUBES, LIKE COLOR IMAGE TUBES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0137373A1 EP0137373A1 (en) | 1985-04-17 |
| EP0137373B1 true EP0137373B1 (en) | 1988-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84111219A Expired EP0137373B1 (en) | 1983-09-22 | 1984-09-20 | Electron gun for multiple cathode ray tubes such as colour picture tubes |
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| Country | Link |
|---|---|
| US (1) | US4631442A (en) |
| EP (1) | EP0137373B1 (en) |
| JP (1) | JPS6095836A (en) |
| CA (1) | CA1216016A (en) |
| DE (2) | DE3334242A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2553035B2 (en) * | 1985-06-19 | 1996-11-13 | 株式会社日立製作所 | Electron gun for color picture tube |
| JP2815169B2 (en) * | 1989-03-18 | 1998-10-27 | 株式会社日立製作所 | In-line type electron gun |
| US5010271A (en) * | 1989-10-24 | 1991-04-23 | Rca Licensing Corporation | Color picture tube having an electron gun with reduced convergence drift |
| US4952186A (en) * | 1989-10-24 | 1990-08-28 | Rca Licensing Corporation | Method of making a color picture tube electron gun with reduced convergence drift |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2642560C2 (en) * | 1976-09-22 | 1983-08-04 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Color cathode ray tube |
| NL7902159A (en) * | 1979-03-20 | 1980-09-23 | Philips Nv | COLOR TELEVISION PICTURE TUBE. |
| DE2920151C2 (en) * | 1979-05-18 | 1985-04-11 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Electron gun for cathode ray tubes |
| JPS56130063A (en) * | 1980-03-17 | 1981-10-12 | Mitsubishi Electric Corp | Electron gun electrode |
| JPS56153652A (en) * | 1980-04-30 | 1981-11-27 | Toshiba Corp | Electron gun frame for color cathode-ray tube |
-
1983
- 1983-09-22 DE DE19833334242 patent/DE3334242A1/en not_active Withdrawn
-
1984
- 1984-09-20 DE DE8484111219T patent/DE3469103D1/en not_active Expired
- 1984-09-20 EP EP84111219A patent/EP0137373B1/en not_active Expired
- 1984-09-21 US US06/653,753 patent/US4631442A/en not_active Expired - Lifetime
- 1984-09-21 JP JP59196942A patent/JPS6095836A/en active Granted
- 1984-09-21 CA CA000463714A patent/CA1216016A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3334242A1 (en) | 1985-04-04 |
| DE3469103D1 (en) | 1988-03-03 |
| CA1216016A (en) | 1986-12-30 |
| JPH0410697B2 (en) | 1992-02-26 |
| US4631442A (en) | 1986-12-23 |
| JPS6095836A (en) | 1985-05-29 |
| EP0137373A1 (en) | 1985-04-17 |
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