JP4189227B2 - Color picture tube device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color picture tube device, and more particularly to an electrode constituting a main lens for focusing a plurality of electron beams on a screen.
[0002]
[Prior art]
In general, a color picture tube apparatus has an envelope made up of a panel and a funnel integrally joined to the panel, and three electron beams emitted from an electron gun arranged in the neck of the funnel are A color image is displayed by being deflected by the horizontal and vertical deflection magnetic fields generated by the deflection device mounted on the outside and being emitted onto a phosphor screen formed facing the shadow mask on the inner surface of the panel while performing horizontal and vertical scanning. It is formed as follows.
[0003]
In general, the magnetic field of the deflecting device used in such a color picture tube device has a self-convergence configuration in which three electron beams are concentrated on the screen. The deflection magnetic field is distorted in a barrel shape. For this reason, the three electron beams that pass through the deflection magnetic field receive a diverging action in the horizontal direction and a focusing action in the vertical direction.
[0004]
When the electron beam trajectory becomes longer as the deflection angle increases, the above-mentioned astigmatism appears remarkably in the periphery of the phosphor screen surface due to the self-convergence magnetic field as described above, and the electron beam spot becomes longer in the horizontal direction. There is a problem that the horizontal resolution is reduced due to a horizontally long and flat cross-sectional shape on which the axis is placed. This problem has become more prominent due to the flattening of panels and the expansion of the deflection angle as in recent years.
[0005]
Therefore, in order to draw an image with high resolution on the phosphor screen surface, it is necessary to reduce the spot diameter in the horizontal direction in advance by a child gun.
As one attempt to meet this demand, a technique for applying a dynamic voltage to a focusing electrode constituting an electron gun is known. In this method, a voltage that increases as the amount of deflection increases is applied to the focusing electrode that is positioned closest to the final electrode. As a result, the action of the main lens electric field increases as the amount of deflection increases. It is a technique for correcting the beam spot shape by correcting astigmatism.
[0006]
As an application of such dynamic voltage technology, the shape and direction of the beam passage hole of the electrode are adjusted so that the applied dynamic voltage can be reduced, and the condition of the voltage applied to each electrode is specified. A technique is proposed in Japanese Patent No. 3040272.
By the way, the spot diameter in the color picture tube device can be made smaller as the spherical aberration in the main lens electric field of the electron gun is smaller. When the incident angle of the electron beam to the main lens electric field is α, the spot diameter δ contributed by the most dominant spherical aberration in the main lens electric field is
δ = (M ・ CsP ・ α ^Three ) / 2
It is expressed. Here, M is a lens magnification, and CsP is a spherical aberration coefficient. As can be seen from this equation, spherical aberration is reduced when the lens action by the main lens electric field is weakened. That is, the spot diameter on the phosphor screen can be reduced by effectively increasing the lens diameter by the main lens electric field.
[0007]
The OLF disclosed in Japanese Examined Patent Publication No. 2-18540 as realizing this concept by the electrode structure ( O ver L apping F ield) there is a lens. The electrode configuration is shown in FIG.
As shown in FIG. 13, the main electrode includes a focusing electrode 101, a final acceleration electrode 102, and a shield cup 103 connected to the final acceleration electrode 102 that are spaced apart from each other in the tube axis direction.
[0008]
The focusing electrode 101 and the final accelerating electrode 102 recede from the opposing end surfaces of the cylindrical outer peripheral electrodes 101A and 102A each having a flat cylindrical shape that is long in the horizontal scanning direction surrounding the three electron beams, and the cylindrical outer peripheral electrodes. The correction electrode plates 101B, 102B1, 102B2, and 102B3 with the three holes 101B1, 101B2, and 101B3 arranged so that the electron beam passes almost vertically at the positions are formed of the correction electrode plates 102B with the openings. . The correction electrode plates 101B and 102B play a role of generating three main lens electric fields corresponding to the three electron beams.
[0009]
The focusing electrode 101 forming the main lens electric field and the correction electrode plates 101B and 102B arranged inside the cylindrical outer peripheral electrodes 101A and 102A of the final accelerating electrode 102 are retracted inward so that the inside of the focusing electrode 101 Thus, the high potential of the final acceleration electrode 102 penetrates deeply, and the low potential of the focusing electrode 101 penetrates deeply into the final acceleration electrode 102. As a result, the lens diameter by the main lens electric field is effectively enlarged, and the spot diameter on the phosphor screen can be reduced.
[0010]
[Patent Document 1]
Patent No. 3040272
[0011]
[Patent Document 2]
No. 2-18540
[0012]
[Patent Document 3]
JP-A-8-22780
[0013]
[Problems to be solved by the invention]
Here, when the dynamic voltage technology is applied to the electrode configuration constituting the OLF lens and the dynamic voltage is to be reduced to a low value, the voltage value to be applied to the electrode by adjusting the shape and direction of the beam passage hole is set. According to the specified method, it is difficult to make the beam passage hole optimally designed to satisfy all the characteristics, and there is a limit in design and the feasibility is poor.
[0014]
An object of the present invention is to provide a color picture tube provided with an electron gun that can easily reduce the dynamic voltage when an OLF lens is combined with a dynamic voltage technique.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a panel having a screen formed of phosphors of a plurality of colors, a plurality of cathode portions arranged in-line, and a plurality of particles emitted from the cathode portion and directed toward the screen. An electron gun having an electron gun having a cylindrical electrode that is arranged on a path of an electron beam through a gap and has a flat cylindrical shape that is long in the horizontal scanning direction, and the cylindrical electrode includes: An aperture common to the plurality of electron beams, a correction electrode plate provided so that one principal surface faces the gap at a position retracted from an end provided with the aperture, and the correction electrode plate A plurality of beam passage holes provided to form a main lens electric field, and the correction electrode plate of at least one cylindrical electrode sandwiches the beam passage hole from the vertical direction in the horizontal direction and the Wherein a pair of partition-like electrode plate extending in a direction towards the gap lens field is formed is provided.
[0016]
According to this, an auxiliary lens is formed by adding a screen-like electrode plate in addition to the conventional lens system by a method without design difficulties, including a correction electrode plate and providing a screen-like electrode plate. With this auxiliary lens, the difference in the focusing force between the horizontal direction and the vertical direction in the main lens is enlarged, and as a result, the dynamic voltage can be further reduced.
[0017]
Here, the cylindrical electrode having the correction electrode provided with the screen-like electrode includes a final electrode on the screen side.
By providing the correction electrode plate and the screen electrode plate in the final electrode in this way, an auxiliary lens is formed on the most screen side in the electron gun, and the focusing power in the horizontal and vertical directions of the main lens is adjusted efficiently. Can be planned.
[0018]
Here, when the number of the cylindrical electrodes having the correction electrode provided with the screen-like electrode is two or more, other than the final electrode includes a focusing electrode located on the cathode side of the final electrode, To do.
Thereby, it becomes possible to weaken spherical aberration and improve the effect of the double quadrupole lens.
[0019]
Here, the bottom of the shield cup provided on the screen side of the final electrode protrudes into the final electrode, so that the bottom functions as the correction electrode plate.
In this way, the shield electrode can be fitted into the cylindrical portion, and at the same time, the correction electrode can be disposed therein, so that the electron gun can be easily assembled.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
Hereinafter, a color picture tube 1 according to an embodiment of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a cross-sectional view in the horizontal scanning direction showing the configuration of the color picture tube 1.
[0021]
As shown in this figure, the color picture tube 1 has three colors of R (red), G (green), and B (blue) so as to face a shadow mask 11 having a large number of electron beam passage holes. The picture tube 10 is provided with a screen 12 on which the phosphor is coated in layers on the back surface, and an in-line electron gun 20 inserted from the base end side of the neck portion 13 of the picture tube 10. The three electron beams 30R, 30G, and 30B corresponding to the RGB colors emitted from the in-line electron gun 20 are provided along the boundary surface between the neck portion 13 and the enlarged diameter portion 14 of the funnel portion. The beam passes through the deflection magnetic field induced by the deflection coil 15 and is deflected by a predetermined amount in the vertical and horizontal directions and is focused on a predetermined position on the screen 12.
[0022]
Details of the structure of the in-line electron gun 20 will be described.
FIG. 2 is a perspective view of the inline-type electron gun 20, and FIG. 3 is a top view showing the internal configuration in more detail.
As shown in this figure, the in-line type electron gun 20 includes three sets of in-line cathodes 21, a grid electrode 22 that accommodates the cathodes 21, an acceleration electrode 23, a focusing electrode 24, a focusing electrode 25, and a focusing electrode. The electrode 26, the focusing electrode 27, the final acceleration electrode 28, and the shield cup 29 are included. A voltage that forms an electric field for generating, accelerating, and focusing an electron beam is applied to each electrode in a predetermined amount so as to generate a predetermined potential difference between the electrodes. Then, the three electron beams are emitted in a predetermined direction while controlling the diameter and the trajectory thereof.
[0023]
Specifically, an electron beam is generated from the cathode 21, and the energy amount (current amount) of the electron beam is controlled by the cathode 21, the lattice electrode 22, and the acceleration electrode 23. Next, a prefocus lens electric field is generated between the accelerating electrode 23 and the focusing electrode 24, and the divergence angle of the electron beam incident on the subsequent main lens electric field is adjusted. The focusing electrodes 24, 25, and 26 are unipotential type, and serve to assist the preliminary focusing of the electron beam by the prefocus lens electric field.
[0024]
The focusing electrode 27 and the final accelerating electrode 28 constitute a main lens electric field as will be described below, and a divergence angle finally adjusted by the main lens electric field is emitted toward the deflection magnetic field generated by the deflection coil. Will be.
The focusing electrode 27 and the final accelerating electrode 28 each include a cylindrical outer peripheral electrode 27A, a cylindrical outer peripheral electrode 28A, a cylindrical outer peripheral electrode 27A, The correction electrode plate 27B having three holes 27B1, 27B2, and 27B3 arranged so that the electron beam passes substantially vertically at a position retracted from the opposed end surface of the cylindrical outer peripheral electrode 28A, and the electron beam is substantially vertical. The correction electrode plate 28B has three holes 28B1, 28B2, and 28B3 arranged so as to pass through. The focusing electrode 27 and the final acceleration electrode 28 play a role of generating a main lens electric field of the electron gun.
[0025]
In this way, the focusing electrode 27 that forms the main lens electric field, the cylindrical outer peripheral electrode 27A of the final acceleration electrode 28, and the correction electrode plate 27B and the correction electrode plate 28B disposed inside the cylindrical outer peripheral electrode 28A are retracted inward. As a result, the high potential (Va in the figure) of the final acceleration electrode 28 penetrates deeply into the focusing electrode 27, and the low potential (Vfoc2 in the figure) of the focusing electrode 27 penetrates deeply into the final acceleration electrode 28. become. In particular, with regard to the final accelerating electrode, since the correction electrode plate is provided inside, there are three closer to the focusing electrode side end of the outer peripheral electrode 28A than in the case where the correction electrode plate is not provided. A hole will be placed. For this reason, the pitch between the center lens and the side lens is larger in the three lenses formed by the three electron beam passage holes than in the case where the correction electrode plate is not provided inside (conversely, the correction electrode plate is provided). Otherwise, the three electron beam passage holes are only formed in the shield cup and are located far from the focusing electrode side end of the outer peripheral electrode 28A. The pitch decreases as the diameter of the lens increases and the lens center approaches. Thus, when the pitch between the center lens and the side lens is increased, the distance between the shadow mask and the screen can be shortened by that amount, thereby making it difficult to cause beam shift movement due to geomagnetism. There is also.
[0026]
In the above configuration, the potential Vfoc1 is applied to the focusing electrode 24 and the focusing electrode 26, and the dynamic voltage Vfoc2 is applied to the focusing electrode 27. Vfoc1 is fixed, and Vfoc2 is increased according to the deflection amount of the electron beam. The relationship between the two is set to Vfoc1> Vfoc2 when the deflection amount is zero (not deflected). As a result, the astigmatism can be corrected and the beam spot shape can be controlled by weakening the effect of the main lens electric field as the deflection amount increases. Further, by controlling the dynamic voltage from the state of Vfoc1> Vfoc2 as described above, the dynamic voltage can be reduced. This method is described in detail in Japanese Patent No. 3040272.
[0027]
A configuration diagram of the correction electrode plate 28B is shown in FIG. As shown in this figure, the correction electrode plate 28B is formed by providing three circular holes in a flat plate body having a shape similar to the opening shape of the outer peripheral electrode 28A and extending in the horizontal scanning direction.
Electrodes 40 and 41 are attached to the correction electrode plate so as to be electrically conductive in a partition shape (this electrode is referred to as a partition electrode plate). As shown in FIGS. 2 and 3, the partition electrode plates 40 and 41 are arranged so as to extend parallel to each other in the horizontal scanning direction and sandwich the electron beam passage hole. Further, it is provided on the surface side facing the gap side so as to protrude toward the gap Gap formed in the portion facing the focusing electrode 27 and the final acceleration electrode 28.
[0028]
By arranging the partition-like electrode plate so as to protrude to the gap side in this way, in the main lens, the difference in the focusing force between the horizontal direction and the vertical direction (referred to as HV difference) can be enlarged, Thereby, the value of the dynamic voltage can be reduced. Here, by applying a dynamic voltage, the HV difference is enlarged and the lens action is weakened. There is also an effect that the electric field and spot distortion constituting the main lens can be directly improved with high sensitivity.
[0029]
Here, FIG. 6 is a diagram showing a lens model based on a main lens electric field when the screen-like electrode plates 40 and 41 are not provided, in which (a) shows a horizontal section (horizontal scanning direction) in (b). The lens model of a vertical section (vertical scanning direction) is shown.
As shown in this figure, the main lens has different focusing powers in the horizontal direction and the vertical direction. As described above, it is important to set the difference in focusing power, that is, the HV difference, to reduce the dynamic voltage. .
[0030]
In this lens model, 60, 61, and 62 are main lenses based on a main lens electric field, which are convex lenses having a strong focusing action in the horizontal direction and forming a convex lens having a weaker focusing action in the vertical direction (lens action). Is shown by the lens thickness). In order to focus on the screen, the lenses 63, 64, 64 are arranged on the cathode side of the main lens, that is, on the electron beam position where the electron beam speed is relatively slow so as to compensate for the difference in the lens action occurring in the horizontal and vertical directions. 65 is formed separately. This lens is a quadrupole lens constituting a concave lens having a strong diverging action in the horizontal direction and a convex lens having a strong focusing action in the vertical direction.
[0031]
FIG. 5 is a diagram showing a lens model based on a main lens electric field in the case of this embodiment provided with the screen-like electrode plates 40 and 41, in which (a) shows a horizontal section (horizontal scanning direction) (b). Shows a lens model of a vertical section (vertical scanning direction).
As shown in this figure, an auxiliary lens is added by a screen-like electrode plate, which is considered to function as a main lens.
[0032]
Specifically, in this lens model, 50, 51, and 52 are one of the main lenses based on the main lens electric field, and constitute a convex lens having a strong focusing action in the horizontal direction and a convex lens having a focusing action in the vertical direction. ing. Further, in addition to the lenses 50, 51 and 52, auxiliary lenses 53, 54 and 55 are additionally formed by adding a screen-like electrode plate. This lens is a convex lens having a strong focusing action in the horizontal direction and a concave lens having a diverging action in the vertical direction. In order to focus on the screen, the cathode side of the main lens, that is, at a position where the electron beam speed is relatively slow so as to compensate for the difference in the lens action occurring in the horizontal and vertical directions, the diverging action is caused in the horizontal direction. Quadrupole lenses 56, 57, and 58 that form a strong concave lens and a convex lens having a strong focusing effect in the vertical direction are formed.
[0033]
As is apparent from the above, by providing the screen-like electrode plate as in the present embodiment, the HV difference is increased by adding the auxiliary lens. As a result, the dynamic voltage can be reduced as compared with the conventional one (without the screen electrode plate).
Here, a specific example will be given of the fact that the HV difference is increased by providing the partition electrode plate on the correction electrode plate. FIG. 7 shows changes in the HV difference (here, the difference between the horizontal direction focus voltage and the vertical direction focus voltage) with respect to the change in the height of the screen electrode plate from the correction electrode plate. When the height of the screen electrode is 0.0, that is, when there is a correction electrode plate and no screen electrode plate as in the prior art, the HV difference is 1400V, but the screen electrode plate is attached. The higher the height, the higher the HV difference.
[0034]
FIG. 8 is a diagram showing a change in dynamic voltage and a change in horizontal spot diameter when the HV difference is changed. If the HV difference is increased, the dynamic voltage can be reduced and the withstand voltage strength can be lowered accordingly, so that simplification of the circuit and cost reduction can be expected. However, if the HV difference is changed, the horizontal spot diameter will also change, and if the HV difference is increased, the horizontal spot diameter will increase once again from the vicinity of the HV difference, but this horizontal spot diameter will be minimized. It is desirable to make HV difference. In the electron gun mentioned in this embodiment, the horizontal spot diameter is the smallest when the HV difference is around 3000V.
[0035]
Thus, in the present embodiment, the height of the screen-like electrode is set to about 0.5 mm so that the HV difference is 3000 V (see FIG. 7). By doing so, both the dynamic voltage and the horizontal spot diameter can be set to values smaller than those of the prior art. For reference, the dimensions of other parts are as follows. In the electron gun of the present embodiment, the length of the cylindrical electrode having the correction electrode plate provided with the screen-like electrode is 7.0 mm. The length in the tube axis direction from the screen side end to the correction electrode plate is 4.6 mm, and the thickness of the correction electrode plate is 0.7 mm.
[0036]
The screen-like electrode plates 40 and 41 are provided on the surface side facing the gap side so as to protrude to the gap side formed in the portion facing the focusing electrode 27 and the final acceleration electrode 28 as described above. Thus, the lens action of the auxiliary lens is maximized. That is, the sensitivity to the lens electric field can be increased by providing the tip of the screen-like electrode plate at a position close to the gap having a steep potential gradient. However, if it is too close, the thin plate will be close to the low-pressure side, resulting in an undesirable phenomenon such as the occurrence of discharge in the proximity, so the position is limited to the extent that such discharge does not occur. It is necessary to The higher the screen-like electrode plate is, the closer the tip is to the gap, so that the effect of reducing the dynamic voltage is improved. However, the screen-like electrode plate is added to the correction electrode plate provided inside the cylindrical portion as in the present invention. Since the tip can be brought close to the gap without increasing the height of the screen-like electrode plate itself, the mounting accuracy of the screen-like electrode plate is maintained high. There is also an advantage that variation in action caused by variation in the degree of opening of the tip can be avoided.
[0037]
In addition, the lens magnification in the horizontal direction is reduced and the lens magnification in the vertical direction is increased by the double quadrupole effect of the screen side quadrupole lenses 53, 54 and 55 and the cathode side quadrupole lenses 56, 57 and 58. As a result, the problem that the astigmatism is further corrected and the electron beam spot is horizontally distorted can be further suppressed.
[0038]
The electron gun can be configured as follows. FIG. 9 is a plan view showing a configuration of an inline type electron gun of this modification.
As shown in this figure, in the modification, an intermediate electrode 70 is provided between the focusing electrode 27 and the final acceleration electrode 28 in the above-described in-line electron gun. Here, the potential Vm2 is applied via the resistor R1. With such a configuration, in addition to the above-described actions and effects, the electric field lens is expanded in the tube axis direction, so that the effective lens aperture can be further increased. Such a configuration and effect are described in detail in JP-A-8-22780.
[0039]
[Embodiment 2]
Next, a second embodiment of the present invention will be described.
FIG. 10 is a plan view showing the configuration of the inline-type electron gun according to the present embodiment, and FIG. 11 shows the lens model thereof.
The difference from the first embodiment is that a pair of screen-like electrode plates 60 and 61 are also projected on the correction electrode plate 27B toward the gap formed in the portion facing the focusing electrode 27 and the final acceleration electrode 28, as described above. Thus, it is provided on the surface side facing this gap side.
[0040]
With this configuration, in addition to the lens of FIG. 5 as shown in FIG. 11, quadrupole lenses 66 and 67 having a diverging action (concave lens) in the horizontal direction and a converging action (convex lens) in the vertical direction on the lower pressure side than the main lens. , 68 are generated.
With this lens, since the horizontal focusing force is weakened in the low-pressure portion where the influence of the spherical aberration of the main lens is large, it is possible to weaken the horizontal spherical aberration that most affects the spot characteristics.
[0041]
Further, the strength of the cathode-side quadrupole lenses 56, 57, and 58 is determined by the potential difference between the electrodes 27 and 28. If the lens action is strengthened, problems such as discharge occur, so the potential difference is increased. Therefore, the strength of the cathode-side quadrupole lenses 56, 57, and 58 is naturally limited. However, since the main lens low-pressure side lenses 66, 67, and 68 supplementarily serve to strengthen the cathode-side quadrupole lenses 56, 57, and 58, the HV difference can be further increased without being limited by such restrictions. (Enhance the effect of the double quadrupole).
[0042]
[Embodiment 3]
Next, a third embodiment of the present invention will be described.
FIG. 12 is a plan view showing the configuration of the inline-type electron gun according to the present embodiment. As shown in this figure, in this inline type electron gun, in the inline type electron gun of Embodiment 1, a convex portion 29A is formed on the shield cup, and this portion enters into the final acceleration electrode, and its bottom portion 29B is the correction electrode. It is configured to function as a plate.
That is, the bottom 29B is positioned to the middle of the cylindrical outer peripheral electrode of the shield cup in which the same three holes as those provided in the correction electrode arranged so that the electron beam passes substantially vertically are formed in the bottom 29B. It is inserted to do. In the bottom 29B, screen-like electrode plates 40 and 41 are provided in the same manner as described above.
[0043]
With such a configuration, the above-described operations and effects can be achieved, and the correction electrode can be disposed inside the shield cup while being fitted into the cylindrical portion. Therefore, the electron gun can be easily assembled. .
In addition, although Embodiment 2 and 3 can also be implemented each independently, it is good also as combining them mutually. This provides a synergistic effect.
[0044]
Further, as described above, the present invention is particularly effective for a technique for applying a dynamic voltage, but is not limited thereto. Even an electron gun that does not apply a dynamic voltage to the electrodes can be applied as a means for adjusting the HV difference.
[0045]
【The invention's effect】
As described above, according to the color picture tube apparatus of the present invention, it is possible to provide assistance by adding a screen-like electrode plate in addition to the conventional main lens system by a method without design difficulty of providing a screen-like electrode plate. By additionally forming a lens, the difference in focusing force between the horizontal direction and the vertical direction in the main lens can be enlarged, and as a result, the dynamic voltage can be further reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the horizontal scanning direction showing a configuration of a color picture tube common to an embodiment.
FIG. 2 is a perspective view illustrating a configuration of an inline-type electron gun according to the first embodiment.
3 is a plan view showing a configuration of the inline-type electron gun of FIG. 2;
FIGS. 4A and 4B are a front view and a side view showing a configuration of a correction electrode plate and a screen-like electrode plate, respectively.
FIG. 5 is a model diagram illustrating a main lens configuration in the inline-type electron gun according to the first embodiment.
FIG. 6 is a model diagram showing a main lens configuration in an in-line type electron gun of a conventional example (when there is no screen-like electrode plate).
FIG. 7 is a diagram illustrating a change in HV difference (here, a difference between a horizontal focus voltage and a vertical focus voltage) with respect to a change in the height of a screen electrode plate from a correction electrode plate.
FIG. 8 is a diagram showing a change in dynamic voltage and a change in horizontal spot diameter when the HV difference is changed.
9 is a plan view showing a configuration of a modified example of the inline-type electron gun of Embodiment 1. FIG.
FIG. 10 is a plan view showing a configuration of an inline-type electron gun according to a second embodiment.
FIG. 11 is a model diagram illustrating a main lens configuration in an inline-type electron gun according to a second embodiment.
12 is a plan view showing a configuration of an inline-type electron gun according to Embodiment 3. FIG.
FIG. 13 is a plan view showing a configuration of a conventional in-line type electron gun (OLF lens configuration).
[Explanation of symbols]
20 In-line type electron gun
27 Focusing electrode
27A Cylindrical outer peripheral electrode
27B Correction electrode plate
28 Final acceleration electrode
28A Cylindrical outer peripheral electrode
28B Correction electrode plate
29 Shield Cup
29A Convex (shield cup part)
29B Bottom (shield cup part)
40, 41, 60, 61 Screen electrode plate
50-58 Main lens (4-pole lens)
53-55 Auxiliary lens (composed of main lens)
66-68 quadrupole lens (generated by screen electrode 60, 61)
70 Intermediate electrode

Claims (4)

A panel having a screen formed of phosphors of a plurality of colors, a plurality of cathode portions arranged in-line, and a plurality of electron beams emitted from the cathode portion and traveling toward the screen side, arranged with a gap therebetween. A color picture tube device comprising an electron gun having a cylindrical electrode having a flat cylindrical shape that is long in the horizontal scanning direction ,
The cylindrical electrode includes an aperture common to the plurality of electron beams, and a correction electrode plate provided so that one principal surface faces the gap at a position retracted from an end portion where the aperture is provided. , Having a plurality of beam passage holes provided in the correction electrode plate, forming a main lens electric field,
The correction electrode plate of at least one of the cylindrical electrodes has a pair of screen-like electrode plates extending in a horizontal direction and a direction toward the gap where the main lens electric field is formed with the beam passage hole being sandwiched from the vertical direction. A color picture tube device characterized by comprising: 2. The color picture tube apparatus according to claim 1, wherein the cylindrical electrode including the correction electrode provided with the screen-like electrode includes a final electrode on a screen side. 3. The focusing electrode located on the cathode side of the final electrode other than the final electrode is included when the number of the cylindrical electrodes having the correction electrode provided with the screen-shaped electrode is two or more. 2. A color picture tube apparatus according to 2. 4. The bottom portion functions as the correction electrode plate by forming a bottom surface of a shield cup provided on the screen side of the final electrode so as to protrude into the final electrode. A color picture tube device according to claim 1.

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