JP2003051269A - Color television picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide color television picture tube which can cope making the panel flat or increase in the deflection angle. SOLUTION: A screen 11 is substantially made flat, a horizontal deflection magnetic field is made substantially uniform in magnetic field, and a vertical deflection magnetic field is made substantially a pin-cushion magnetic field. The projections of three electron beams 4, 5, and 6 are made mutually almost parallel at incidence into the deflection magnetic field region 10. Furthermore, it is adjusted so that three focus points of the electron beams 7, 8, and 9, which are located at the same time on the horizontal axis, are kept to have an interval in the horizontal distance s mutually. Moreover, according to the time lags of the time, which the three focus points of the electron beams 7, 8, and 9 scan the same point on the screen 11 respectively, the input timing of the modulation signals 12, 13, and 14 which are given to the three electron beams 4, 5, and 6, are made to have time lags.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube device used for a computer monitor, a television receiver or the like.

[0002]

2. Description of the Related Art Color picture tube devices are R (red), G
Color images are formed by superimposing images of three colors (green) and B (blue) on a screen, and it is an essential condition for a video device to perform the superimposing, that is, the convergence with high accuracy.

The most widely known method for converging images is the "self-convergence method" in which the deflection magnetic field is adjusted so that the image formation points of three electron beams overlap at any position on the screen. There is a method called "signal phase convergence method". This is because the image forming points of the three electron beams are shifted on the screen without intentionally overlapping each other, and the time lag of the input timing of the input modulation signal is given to each electron beam, whereby R, G, and B on the screen are changed. This is a method in which the spatial deviation amounts of the three color images are corrected and the images drawn by the three image forming points of the electron beams are overlapped and coincident with each other over the entire screen in appearance.

Japanese Patent Publication No. 6-46812 discloses an example of a signal phase convergence method. In this technique, three electron beams emitted from an electron gun are made substantially parallel to each other, a horizontal deflection magnetic field has a substantially uniform magnetic field distribution, and the half-value width of the magnetic flux density distribution is 0. 1 to 0.4 times, the vertical deflection magnetic field has a barrel-shaped magnetic field distribution, and signals to three electron beams are given with a time difference. With such a configuration, the shape distortion of the electron beam at the peripheral portion of the screen can be eliminated.

[0005]

However, the self-convergence method, which performs convergence only by the magnetic field distribution, has a problem that there is a limit to the flatness and the shortening of the panel in recent years. . The flatness and shortening of the panel of the color picture tube device increase the deflection angle, which increases the distance from the electron gun to the periphery of the screen. The magnetic field distribution becomes complicated to make them coincide with each other.
This is because there is a limit to obtaining high resolution.

Further, in the structure disclosed in Japanese Patent Publication No. 6-46812, which is cited as an example of the signal phase convergence method, the PQV is provided at the corner portion of the screen.
A vertical misconvergence of R and B, which is called a component, is likely to occur, and this is remarkable as the panel of the color picture tube device is flattened and the depth is shortened.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a color picture tube device capable of coping with the flattening of the panel and the increase of the deflection angle.

[0008]

In order to solve the above-mentioned problems, in the color picture tube device of the present invention, three electron sources corresponding to three colors of R, G and B are arranged inline in the horizontal direction. The three radiated electron beams enter the deflection magnetic field region with a space between them, forming three electron beam imaging points that do not overlap on one point on the screen. When the three electron beam imaging points are horizontally and vertically deflected by the magnetic field and the three electron beam imaging points scan the same point on the screen, the input timings of the modulation signals given to the three electron beams have a time difference. With this, in the color picture tube device of the type that forms a color image on the screen, the screen is made substantially flat, and the horizontal deflection magnetic field is reduced. Homogeneous magnetic field, the vertical deflection magnetic field is a pincushion magnetic field, and the trajectories of both side beams at the moment when the three electron beams are incident on the deflection magnetic field region are substantially parallel to the trajectories of the central beam, and on the horizontal axis. Are adjusted so that the three electron beam image formation points at the same time are kept at the distance s in the horizontal direction.

By doing so, it is possible to arrange the three electron beam image forming points in a horizontal row and easily perform signal phase convergence.

Further, in the color picture tube device of the present invention, three electron beams emitted from three electron sources corresponding to the three colors of R, G, and B arranged inline in the horizontal direction are adjacent to each other. Incident on the deflection magnetic field region in a state of having a space between and, forming three electron beam imaging points that do not overlap one point on the screen, undergo horizontal and vertical deflection by the horizontal deflection magnetic field and the vertical deflection magnetic field, and Since the input timings of the modulation signals given to the three electron beams have a time difference in accordance with the time difference between the time when the electron beam imaging points scan the same point on the screen,
In a color picture tube device of the type that forms a color image on a screen, the screen is substantially flat, and the vertical deflection magnetic field is a pincushion magnetic field,
And the horizontal deflection magnetic field is a weak pincushion magnetic field,
The orbits of both side beams at the moment when the three electron beams are incident on the deflection magnetic field region are directed inward with respect to the orbit of the central beam, and the three electron beam imaging points at the same time on the horizontal axis are Adjustments are made so that they are horizontally spaced from each other by a distance s.

By doing so, it is possible to cancel the spread of the interval between the image forming points of the electron beam, and the horizontal interval s between the image forming points of the electron beam is equal in the central portion and the horizontal peripheral portion of the screen. Can be kept at intervals.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a block diagram for explaining the principle of a color picture tube device according to an embodiment of the present invention.

The color picture tube device 15 according to the embodiment of the present invention includes an electron source 1 corresponding to R (red) and G (green).
, An electron gun (not shown in its entirety) including an electron source 3 corresponding to B (blue), electron beams 4, 5, 6 corresponding to each, and imaging points 7, 8, 9, It is composed of a deflection magnetic field region 10 created by a horizontal deflection coil and a vertical deflection coil, a substantially flat screen 11, and modulation signals 12, 13, 14 applied to each electron beam. The electron sources 1, 2, 3 correspond to the three cathodes of the in-line electron gun, and the electron beams 4, 5, 6 emitted from these electron sources are formed by the potential difference between the electrodes of the electron gun. , 42, 43. Electron beams 4, 5 and 6 are in the deflection magnetic field region 1
When the electron beam is deflected by 0, the electron beams 4 ', 5',
6'and the image forming point 7'8'9 '. In addition to the above, there is a shadow mask 16 shown by a broken line, but it is omitted because it is not necessary for the explanation of the principle.

The color picture tube apparatus of the present invention basically employs the signal phase convergence method. That is, the three electron beam imaging points 7, 8, 9 or 7 ',
8 ′ and 9 ′ are not aligned on the screen, and are arranged at intervals of the horizontal distance s, and the input timings of the modulation signals 12, 13, and 14 placed on these electron beams are shifted, thereby The amount of horizontal deviation of the electron beam image formation point is apparently unknown.

For example, in the video signal circuit, when the R signal is used as a reference, the G signal is delayed by an amount corresponding to the shift amount, and the B signal is further shifted with respect to the G signal. Delay in time by the amount. By doing so, the image actually displayed appears to be converged by overlapping the three images.

Particularly, when the screen is almost flat, the most ideal way to adopt such a signal phase convergence method is that the horizontal deflection magnetic field and the vertical deflection magnetic field are both uniform magnetic fields, and the electrons are not deflected. Beams 4, 5, 6
The orbits of are parallel to each other. By doing so, the horizontal distance s between the three electron beam image forming points can be kept constant over the entire screen, and the given signal phase shift amount can be the same over the entire screen. Can be simple. Further, it is possible to increase the horizontal resolution, which is disadvantageous in the self-convergence method. However, since the deflection device generally composed of windings has a finite length, for example, even if the vertical deflection magnetic field is a uniform magnetic field inside the deflection device, the magnetic field blows out from the end of the deflection device to the barrel. Become a state. Therefore, as shown in FIG. 2, three electron beam image forming points 7 ', which should ideally be arranged in a horizontal line at the corner of the screen,
8 ′ and 9 ′ are shifted in the vertical direction, and as a result, when a horizontal line is drawn on the screen, as shown in FIG. 3, the R line 17 and the B line 18 intersect with each other at the top and bottom of the screen. A horizontal line misconvergence called will occur. This PQ
The V component appears more conspicuously in the technique as described in Japanese Patent Publication No. 6-46812 mentioned above in which the vertical deflection magnetic field has a barrel shape.

In the color picture tube device of the present invention, the vertical deflection magnetic field is a pincushion magnetic field. FIG. 4A is a model view showing the direction of the vertical deflection magnetic field.
FIG. 4B is a model diagram showing the magnetic flux density distribution of the vertical deflection magnetic field with respect to the position in the horizontal axis X direction. The magnetic flux density distribution 19 with respect to the position in the horizontal axis X direction is highest at the center close to the vertical axis Y and becomes lower toward the left and right edges farther from the vertical axis Y, so that the one located closest to the vertical axis Y of the three electron beams. Strongest magnetic field acts on the vertical axis Y
The weakest magnetic field acts on the electron beam located on the side far away from. Therefore, for example, in the upper right corner of the screen,
In FIG. 4A, three electron beam image forming points 7 ′, 8 ′ and 9 ′ which are vertically displaced are indicated by arrows 2 having different vectors.
Since they move like 0, 21, and 22 and are lined up in a horizontal line, as a result, the PQV component is corrected. Further, similarly to this, the PQV component is also corrected at other corners.

The degree of distortion of the vertical deflection magnetic field in this embodiment is z at an arbitrary point on the tube axis Z, Bv (z) is the magnetic flux density of the vertical deflection magnetic field in a cross section perpendicular to the tube axis Z, and The vertical displacement from the axis Z is y, and the magnetic flux density on the tube axis Z is Bv _0.
When the magnetic flux density of the vertical deflection magnetic field is expressed by the equation: Bv (z) = Bv ₀ (z) + Bv ₂ (z) · y ² , Bv ₀
If the maximum value of (z) is standardized as 1 and y is in millimeters, 0 in the region where the vertical deflection device exists on the screen side from the position where the magnetic flux density of the vertical deflection magnetic field on the tube axis is maximum, 0 <Bv ₂ <2.5 × 10 ⁻⁴ [1 / mm ² ] was satisfied.

Next, the horizontal deflection magnetic field will be described.

The horizontal deflection magnetic field is a uniform magnetic field as described above.
It is good to In addition, a perfect uniform magnetic field is a function on the tube axis Z.
Z is the point of interest and the magnetic field of the horizontal deflection magnetic field in a cross section perpendicular to the tube axis Z.
The bundle density is Bh (z) and the displacement from the tube axis Z in the horizontal direction is
x, the magnetic flux density on the tube axis Z is Bh ₀(Z), Bh (z) = Bh₀(Z) + Bh₂(Z) x² When the magnetic flux density of the horizontal deflection magnetic field is expressed by₀
The maximum value of (z) is standardized as 1, and x is in millimeters.
Then, the magnetic flux density of the horizontal deflection magnetic field on the tube axis becomes maximum.
Deflection device exists on the screen side from the position
Within the area, Bh₂Is always zero.

However, since it is impossible to realize such a complete uniform magnetic field and some errors occur,
Here, when the maximum value of Bh ₀ (z) is standardized as 1 and x is in millimeters, the area where the deflection device exists on the screen side from the position where the magnetic flux density of the horizontal deflection magnetic field on the tube axis is maximum. Among them, those satisfying −1 × 10 ⁻⁵ ≦ Bh ₂ ≦ 1 × 10 ⁻⁵ [1 / mm ² ] are recognized as a uniform magnetic field.

The horizontal deflection magnetic field may be a weak pincushion magnetic field. FIG. 5 shows a model of the direction of the horizontal deflection magnetic field, which is a weak pincushion magnetic field, and the direction of the force acting on each electron beam. In such a magnetic field, for example, in the upper right corner of the screen, R is subjected to a magnetic field action such that it moves downward as compared with B.
It plays a role of correcting the V component.

However, when the horizontal deflection magnetic field is a pincushion magnetic field, the horizontal spacing s between the three electron beam image formation points as the electron beam is deflected to the peripheral portion in the horizontal direction of the screen due to the difference in the magnetic flux density distribution in the horizontal direction. There is a tendency to spread out compared to the central part. Also, if the level of the pincushion magnetic field of the horizontal deflection magnetic field is increased to the same level as the conventional self-convergence method, the spot of the electron beam is distorted horizontally and high resolution cannot be obtained, and the merit of the signal phase convergence method is reduced. I will end up.

Therefore, it is preferable that the degree of distortion of the pincushion magnetic field of the horizontal deflection magnetic field is as weak as possible. The degree of distortion of the pincushion magnetic field of the horizontal deflection magnetic field is smaller than that of the vertical deflection magnetic field, and is sufficient compared with the distortion of the pincushion magnetic field used for the horizontal deflection magnetic field in the conventional self-convergence type color picture tube device. It should be small.

FIGS. 6A and 6B show a magnetic flux density curve 24 with respect to displacement in the horizontal axis X direction when the horizontal deflection magnetic field is a weak pincushion magnetic field. For comparison, FIGS. 7A and 7B show magnetic flux density curves 25 with respect to the displacement of the horizontal deflection magnetic field used in the conventional self-convergence method in the horizontal axis X direction. In addition, each,
The displacement in the tube axis Z direction is used as a parameter (here,
z was set to 5 mm. ).

FIGS. 6 (a) and 7 (a) show the magnetic flux density distribution on the screen side from the position where the magnetic flux density is highest on the tube axis Z, and FIGS. 6 (b) and 7 (b). Shows the magnetic flux density distribution on the electron gun side from the position where the magnetic flux density is highest on the tube axis Z. Here, among the magnetic flux density curves 24 and 25, the one at the top of the figure shows the case where the magnetic flux density is the highest on the tube axis Z, and the bending strength of each magnetic flux density curve 24, 25 is It can be considered as the degree of distortion of the deflection magnetic field.

As can be seen from a comparison between FIG. 6 and FIG. 7, the distortion of the horizontal deflection magnetic field of the present invention, which is a weak pincushion magnetic field, particularly on the screen side, is the distortion of the horizontal deflection magnetic field used for the conventional self-convergence magnetic field. It is much smaller than.

In the present embodiment, the degree of distortion of the horizontal deflection magnetic field, which is a weak pinching magnetic field, is determined by the magnetic flux of the horizontal deflection magnetic field in a cross section perpendicular to the tube axis Z, where z is an arbitrary point on the tube axis Z. Let Bh (z) be the density, x be the horizontal displacement from the tube axis Z, and Bh ₀ (z) be the magnetic flux density on the tube axis Z. Bh (z) = Bh ₀ (z) + Bh ₂ (z) When the magnetic flux density of the horizontal deflection magnetic field is expressed by the formula of x ² , Bh ₀
If the maximum value of (z) is standardized as 1 and x is in millimeters, 1 × in a region where the deflection device exists on the screen side from the position where the magnetic flux density of the horizontal deflection magnetic field on the tube axis is maximum. It should satisfy 10 ⁻⁵ <Bh ₂ <1 × 10 ⁻⁴ [1 / mm ² ].

Further, it is more preferable to satisfy the following condition: 1 × 10 ^-5 <Bh ₂ <7 × 10 ^-5 [1 / mm ² ].

In order to suppress the phenomenon that the horizontal distance s between the image forming points of the electron beam, which is caused by using the horizontal deflection magnetic field as a weak pincushion, becomes wider in the horizontal peripheral portion than in the central portion as described above. In the two side beams at the moment when the three electron beams enter the deflection magnetic field region,
It exerts an inward force (close to the center beam) according to the horizontal magnetic field strength. By doing so, it is possible to cancel the spread of the interval between the image forming points of the electron beam, and maintain the horizontal interval s between the image forming points of the electron beam at the center portion and the horizontal peripheral portion of the screen at equal intervals. be able to.

As mentioned before, the deflection magnetic field is
Since the deflecting device that generates this has a finite length and is arranged in a substantially cone shape, it largely distorts by being blown outward at both ends of the deflecting yoke. In particular, due to such distortion in the vertical direction, the horizontal distance s of the image forming point of the electron beam is
Tends to become smaller (or larger) as the vertical deflection amount increases, that is, toward the center of the screen in the vertical direction (this is called the YH component). In order to generate such a YH component, an outward (or inward) force is applied to each of the side beams in accordance with vertical deflection, so that the horizontal distance between the three electron beam image formation points is increased. s can be constant in the center of the screen and in the upper and lower peripheral portions.

As a method of imparting an inward or outward force to both side beams depending on the deflection magnetic field as described above, a quadrupole magnetic field is provided from the vicinity of the main lens of the electron gun to the screen side. One example is to dynamically adjust the trajectory of the electron beam. The configuration is shown in FIG.
As shown in, the deflection device 26 is provided with a simple dynamic convergence device 27, and a part of the deflection current applied to the deflection coil of the deflection device 26 is adjusted in accordance with the strength of the magnetic field, and the coil 28 of the dynamic convergence device 27 is adjusted. It is to flush. In this way, as shown in FIG. 9, the dynamic convergence device 27 forms a quadrupole magnetic field 29 and applies an inward force F1 to the electron beams (R, B) on both sides. The quadrupole magnetic field 29 is dynamic and changes according to the strength of the deflection magnetic field, and can suppress the change in the horizontal interval s due to the change in the deflection amount. Moreover, such a configuration can be easily realized at low cost. Although FIG. 9 shows an example in which an inward force is applied to the electron beams on both sides, it is also possible to apply an outward force by changing the magnetic poles of the dynamic convergence device 27.

Further, the trajectory of the electron beam can be statically adjusted by the quadrupole magnetic field. For example, a magnet device 30 as shown in FIG. 10 is provided on the screen side of the main lens, whereby a quadrupole magnetic field 31 is generated and an outward force F2 is applied to the electron beams (R, B) on both sides. This makes it possible to change the distance between the three electron beams emitted from the electron source and the directions of both side beams. However, the quadrupole magnetic field 31 is static rather than dynamic according to the deflection magnetic field, and always has this action. Although FIG. 10 shows an example in which an outward force is applied to the electron beams on both sides, this magnet 30a
It is also possible to give an inward force by changing the magnetic poles of ~ 30d.

By applying the static action of the quadrupole magnetic field, for example, a magnet device having an action of giving an inward force to the electron beams on both sides is arranged, and the electrons on both sides are further arranged on the screen side. A magnet device having an action of giving an outward force to the beam is sequentially combined and arranged so that the three electron beams are finally parallel to each other. By doing so, the three electron beams are made parallel and the final horizontal interval s thereof is narrowed. In other words, since both side beams are located on the inner side, this avoids a phenomenon in which both side beams hit the inside of the funnel of the color picture tube device and a shadow is likely to appear on the screen (called a neck shadow) as the angle of view becomes wider. be able to.

As described above, according to the present invention, the horizontal distance s between the three electron beam image forming points can be kept constant over the entire screen while suppressing the generation of the PQV component. Therefore, it is possible to realize a color picture tube apparatus of a signal phase convergence type which has a high convergence accuracy, a simple structure, and a high resolution regardless of the widening of the deflection angle. Further, the YH component and neck shadow can be corrected with a simple configuration.

The color picture tube device of the present invention is shown in FIG.
Even if the electron beams 4 and 6 on both sides are not always exactly parallel to the central electron beam 5 at the time of non-deflection, the horizontal distance of the image forming points 7, 8 and 9 on the screen is always s.
If it is ± 1 [mm] or less, there is no practical problem. Further, the screen 11 may not be completely flat but may be slightly spherical, as long as the curvature has a flatness of 1000R or more. Where 1
R = (maximum diagonal outer diameter [mm] /25.4) × 41.

Next, an explanation will be given of an experimental example in which the effect of the present invention was confirmed using a color picture tube device for a 76 cm (32 ") television. In the color picture tube apparatus of the signal phase convergence system in which the orbits of the electron beams of the book are parallel, the amount of PQV generated when the vertical deflection magnetic field is changed to the pincushion magnetic field, the uniform magnetic field, and the barrel magnetic field is shown. In this figure, the horizontal axis represents the YH component at the upper and lower ends, and the vertical axis represents the PQV component at the corner of the screen.The magnetic field distortion of the vertical deflection magnetic field and the YH component have a certain fixed relationship, and the YH component is The degree of distortion of the vertical deflection magnetic field can be alternatively indicated by the following equation: Here, when the YH component in the uniform magnetic field is adjusted to be almost zero, YH Positive sign area of minute barrel magnetic field,
The negative sign areas mean the pincushion magnetic fields, respectively.

Regarding the positive and negative of the YH component, a signal phase difference is given so that the three images overlap at the center of the screen,
When a vertical line is drawn on the screen, a state in which the R line 32 is located on the right and the B line 33 is located on the top and bottom of the screen as shown in FIG. 12A is called a positive YH component, and FIG. The state in which the R line 32 is located on the left and the B line 33 is located on the right and the bottom of the screen as in () is called a negative YH component.

As can be seen from FIG. 11, the PQV component is
When the YH component is zero, that is, when the vertical deflection magnetic field is a uniform magnetic field, it is -0.9 mm, and when the YH component is a positive component, a value larger than that is generated, whereas the YH component is a uniform magnetic field. If the vertical deflection magnetic field (at point (A)) is a pincushion magnetic field that is generated 0.9 mm in the negative direction, the PQV component is 0.1 mm, which is a level at which the horizontal line misconvergence can be ignored. .

That is, the PQV component can be suppressed by using the vertical deflection magnetic field as the pincushion magnetic field as in the present invention. The YH component at this time can be easily corrected by adjusting the beam trajectory dynamically or statically by the quadrupole magnetic field as described above.

Further, FIG. 13 shows a color picture tube apparatus of the present invention in which the vertical deflection magnetic field is a pincushion magnetic field and the horizontal deflection magnetic field is a weak pincushion magnetic field, and a conventional self-convergence method (the vertical deflection magnetic field is a barrel magnetic field and is horizontal. In order to compare the resolution with a color picture tube device in which the deflection magnetic field is a pincushion magnetic field, the results of measuring the horizontal spot diameter (current amount 4.0 mA) of each electron beam at the central portion and the corner portion of the screen are shown. . As can be seen from this figure, the spot diameter, which was about 1.3 mm in both of the center part of the screen, is 5.5 mm in the conventional self-convergence type color picture tube device in the corner part. The color picture tube device of the invention has a value of 4.1 mm, which is 25% smaller, and can be said to be a color picture tube with good resolution.

In the above-described embodiments, the color CRT device in which the electron beam scans in the horizontal axis X direction of the screen is used. However, for example, the color CRT scans in the vertical axis Y direction of the screen. Even when using the device, the present invention can be applied by exchanging horizontal and vertical items.

[0044]

As described above, according to the present invention, it is possible to obtain good convergence over the entire screen without increasing the cost, and to flatten the panel without deteriorating the distortion of the electron beam spot. It is possible to cope with an increase in the deflection angle.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating the principle of a color picture tube device of the present invention.

FIG. 2 is a diagram showing a vertical shift of an electron beam image formation point at a corner portion of a screen.

FIG. 3 is a diagram showing PQV components.

FIG. 4A is a model diagram showing a direction of a vertical deflection magnetic field in one embodiment of the present invention. FIG. 4B is a magnetic flux density distribution with respect to a position in the horizontal axis X direction of the vertical deflection magnetic field in one embodiment of the present invention. Model diagram shown

FIG. 5 is a model diagram showing a direction of a horizontal deflection magnetic field in the embodiment of the present invention.

6A is a diagram showing a magnetic flux density curve distribution of a horizontal deflection magnetic field according to an embodiment of the present invention with respect to a displacement in the horizontal axis X direction on the screen side. FIG. 6B is a horizontal view according to the embodiment of the present invention. Of the deflection field,
The figure which shows the magnetic flux density curve distribution with respect to the displacement of the horizontal axis X direction at the electron gun side.

FIG. 7A is a diagram showing a magnetic flux density curve distribution of a horizontal deflection magnetic field in the conventional self-convergence method with respect to a displacement in the horizontal axis X direction on the screen side, and FIG. 7B is a horizontal deflection magnetic field in the conventional self-convergence method; The figure which shows the magnetic flux density curve distribution with respect to the displacement of the horizontal axis X direction at the electron gun side.

FIG. 8 is a diagram showing a deflection device and a dynamic convergence device according to an embodiment of the present invention.

FIG. 9 is a diagram showing an example of a dynamic convergence device and an action of a quadrupole magnetic field generated by the dynamic convergence device according to one embodiment of the present invention.

FIG. 10 is a diagram showing an example of a magnet device according to an embodiment of the present invention and an action of a quadrupole magnetic field generated by the magnet device.

FIG. 11 is a diagram showing changes in PQV component due to changes in YH component.

FIG. 12 (a) is a diagram showing a positive YH component. (B) Diagram showing negative YH component

FIG. 13 is a diagram comparing horizontal spot diameters of electron beams between a color picture tube apparatus according to an embodiment of the present invention and a conventional self-convergence type color picture tube apparatus.

[Explanation of symbols]

1, 2, 3 electron source 4, 5, 6 electron beam 7, 8 and 9 electron beam imaging points 10 Deflection field area 11 screens 12, 13, 14 modulated signal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Sakurai             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C041 AA03 AC17 AD02                 5C042 FG31 HH01 HH02 HH03                 5C060 BA02 BA07 BB11 BC01 BD06                       BE02 BE07 CA04 CE03 CF03                       CF08 CH02 CH08 CL03 HA08

Claims (4)

[Claims] 1. A deflection magnetic field in which three electron beams emitted from three electron sources corresponding to three colors of R, G, and B arranged in a horizontal direction in an in-line form are spaced from each other. Three electron beam image forming points which are incident on the area and do not overlap one point on the screen, are horizontally and vertically deflected by a horizontal deflection magnetic field and a vertical deflection magnetic field, and the three electron beam image forming points are respectively formed on the screen. In the color picture tube device of the method of forming a color image on the screen, since the input timings of the modulation signals given to the three electron beams have a time difference according to the time difference of the time of scanning the same point above, The screen is substantially flat, the horizontal deflection magnetic field is a substantially uniform magnetic field, the vertical deflection magnetic field is a pincushion magnetic field, and the three electrons are The orbits of both side beams at the moment when the beam enters the deflection magnetic field region are made substantially parallel to the orbit of the central beam, and the three electron beam imaging points at the same time on the horizontal axis have a horizontal distance s. A color picture tube device characterized by being adjusted so as to be kept at intervals. 2. A deflection magnetic field in which three electron beams emitted from three electron sources corresponding to three colors of R, G, and B arranged in a horizontal direction in an in-line form are spaced from each other. Three electron beam image forming points which are incident on the area and do not overlap one point on the screen, are horizontally and vertically deflected by a horizontal deflection magnetic field and a vertical deflection magnetic field, and the three electron beam image forming points are respectively formed on the screen. In the color picture tube device of the method of forming a color image on the screen, since the input timings of the modulation signals given to the three electron beams have a time difference according to the time difference of the time of scanning the same point above, The screen is substantially flat, the vertical deflection magnetic field is a pincushion magnetic field, and the horizontal deflection magnetic field is a weak pincushion magnetic field; The orbits of both side beams at the moment when the three electron beams are incident on the deflection magnetic field region are directed inward with respect to the orbit of the central beam, and the three electron beam imaging points at the same time on the horizontal axis are mutually aligned. Horizontal distance s
A color picture tube device, characterized in that it is adjusted so as to be maintained at the interval. 3. A quadrupole magnetic field is provided near the main lens of the electron gun or on the screen side of the main lens, and the quadrupole magnetic field is
Characteristic that the orbits of the beams on both sides of the three electron beams incident on the deflection magnetic field region are dynamically adjusted so as to be outward or inward with respect to the central electron beam in the traveling direction of the beam The color picture tube device according to claim 1 or 2. 4. A quadrupole magnetic field is provided in the vicinity of the main lens of the electron gun or on the screen side of the main lens, and the quadrupole magnetic field is
Characteristically, the trajectories of the beams on both sides of the three electron beams incident on the deflection magnetic field region are adjusted statically so as to be outward or inward with respect to the central electron beam in the traveling direction of the beam. The color picture tube device according to claim 1.