JPH08203454A - Color image displaying apparatus - Google Patents

Abstract

PURPOSE: To effectively correct convergence axis shift regarding a color image displaying apparatus employing an inline-type color picture tube. CONSTITUTION: A convergence correcting apparatus 30 which holds a pair of first magnetic pieces 7a, 7b installed in a horizontally deflecting axis at a prescribed distance while having an electron beam between them and a pair of second magnetic pieces 10a, 10b installed in vertically deflecting axis at a prescribed distance while having an electron beam between them and which can move in the direction of the horizontally deflecting axis is installed between a deflecting yoke 9 and an auxiliary yoke 13. Consequently, shifting of the YV axis following correction of shifting of the XH axis can be canceled by a simple mechanism and without causing the shifting of the XH axis and the shifting of the YV axis by setting the respective distances of the first and the second pairs of magnetic pieces to be proper values, the shifting can easily be corrected to be in a proper range in which the shifting causes no trouble in practical use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image display device using an in-line type color picture tube, and more particularly to a convergence correction device therefor.

[0002]

2. Description of the Related Art A conventional color image display device will be described. A conventional color image display device using an in-line type color picture tube has R (red), G (green) and B emitted from in-line electron guns arranged in a line along a horizontal deflection axis.
A screen is formed by deflecting the three (blue) electron beams horizontally and vertically by a deflection yoke. Of course 3
The electron beam of the book must be concentrated on one point on the phosphor screen, but generally the distance from the deflection center is different in the center of the screen and other parts, so the concentration of the beam changes depending on the part of the screen and Deviation occurs.
A deflection yoke provided with self-convergence correction was proposed to improve this. This is realized by a deflection yoke in which the horizontal deflection magnetic field is a pincushion magnetic field and the vertical deflection magnetic field is a barrel magnetic field.

Further, in recent color image display devices, demands for higher resolution and higher densities of images are extremely high. Therefore, it is difficult to meet the demands only by the self-convergence correction described above. Deflection yokes have also been devised with additional convergence correction devices, such as secondary yokes with cores. FIG. 9 shows an example thereof. In the figure, 15 is an in-line type color picture tube, 1
Reference numeral 6 is a neck portion of the in-line type color picture tube 15, and 9 is a deflection yoke attached to the in-line type color picture tube 15. A sub-yoke 13 is provided with a core of, for example, 8 poles formed of a ferrite material, and a correction current is passed through a coil 14 added to the core to perform coma correction, static convergence correction, and the like. In addition,
The multi-pole core is not limited to the 8-pole core described above,
Also included are C-type coils and E-type coils formed of permalloy, silicon steel plate, and the like. Also, coma correction is because the vertical deflection coil forms a barrel magnetic field,
This is to correct the phenomenon that the vertical deflection amount of the G (green) electron beam is smaller than that of the R (red) and B (blue) electron beams at the upper and lower ends of the screen.

By the way, the deflection yoke having the above-mentioned self-convergence correction requires the correction of the convergence axis deviation. The deviation of the convergence axis means that the deviation of the convergence occurs when vertical or horizontal unbalance is generated in the vertical or horizontal deflection magnetic field distribution with respect to the electron beam. When a convergence axis shift occurs, generally, the opening side of the deflection yoke is corrected by swinging the head vertically and horizontally along the horizontal deflection or vertical deflection axis. It is known that convergence changes and distortion also changes.

FIG. 10 is a diagram showing the left-right unbalance of the horizontal deflection magnetic field distribution and the resulting deviation in convergence. The XH axis shift and the correction method therefor will be described with reference to FIG. As shown in FIG. 10A, the XH axis shift is a shift that occurs when the horizontal deflection magnetic field 1 is left-right unbalanced with respect to the electron beam 2.
It means the deviation of the convergence of the left and right vertical lines of the red raster 3 and the blue raster 4 on the screen as shown in (b).
(When the red raster 3 ′ and the blue raster 4 ′ before the left and right imbalances are the same.) Of course, when the left and right imbalances of the horizontal deflection magnetic field, which are opposite to those in FIG. The deviation of convergence is opposite to that shown in FIG. In order to correct this XH axis shift, the deflection yoke 9 may be swung left and right along the horizontal deflection axis to remove the left and right imbalance of the horizontal deflection magnetic field. For example, in the case where an axial deviation as shown in FIG. 10A occurs, it is clear that if the deflection yoke 9 is swung to the right, the left and right unbalance is eliminated and the axial deviation can be removed.

Here, a case where the deflection yoke 9 is swung right and left along the horizontal deflection axis will be described. Figure 11
FIG. 6 is a diagram showing left and right unbalance of the vertical deflection magnetic field distribution due to left and right swing of the deflection yoke 9 and accompanying variations in convergence and distortion. When the opening of the deflection yoke 9 is swung to the left side, the horizontal deflection magnetic field 1 and the vertical deflection magnetic field 5 with respect to the electron beam 2 are shown in FIGS.
The left-right imbalance as shown in FIG.
As shown in (b), the red raster 3 spreads vertically and horizontally with respect to the blue raster 4, and the change in strain (that is, the change in the green raster 6) with respect to the swinging neutral state is as shown in FIG.
It spreads to the left as shown in (c).

Of course, when swinging to the right,
The changes are opposite to those of (b) and (c). In the above-mentioned change in convergence, in addition to the XH axis shift, there is a shift in the convergence of the horizontal lines of the upper and lower ends of the red raster 3 and the blue raster 4 on the screen. This is due to the imbalance of the vertical deflection magnetic field. This is the deviation that occurs, and this is called the YV axis deviation. This is because when the deflection yoke 9 is swung, the distribution of both the vertical deflection magnetic field and the horizontal deflection magnetic field with respect to the electron beam is changed due to the structure of the deflection yoke 9. Further, since the magnetic field distribution is changed mainly on the deflection yoke opening side, the influence on the distortion is large. That is,
When the deflection yoke is swung to the left or right to correct the XH axis shift, the result is that the YV axis shift and the distortion are changed.

In order to solve this problem, a magnetic piece is attached to the end of the deflection yoke on the electron gun side, or a swinging operation is performed without providing a multipole core having a device capable of moving the magnetic piece. There is a deflection yoke that does not do either. FIG. 12 is a diagram showing a schematic configuration of an example of a correction device for correcting the XH axis shift using such a magnetic piece and a change in the distribution of the horizontal deflection magnetic field when the correction device is used. FIG. 12 (a) is a view of the deflection yoke side of the in-line type color picture tube from the neck portion 16 side. In the figure, 7a and 7b are magnetic pieces, and 8 is a convergence that allows a pair of magnetic pieces 7a and 7b arranged so as to sandwich an electron beam on the horizontal deflection axis to move left and right along the horizontal deflection axis. The correction device 11 is an elongated hole into which the neck portion 16 is inserted and which allows the correction device 8 to move in the horizontal direction.

As shown in FIG. 12 (b), the magnetic piece pair 7a
When 7b and 7b are moved to the right side when viewed from the tube surface, as if the opening of the deflection yoke was swung to the left,
A horizontal imbalance of the horizontal deflection magnetic field 1 is created, and a change in convergence as shown in FIG. 10 (b) is caused as compared with the case where the pair of magnetic pieces 7a and 7b are symmetrical with respect to the tube axis. Naturally, the change in convergence when the pair of magnetic pieces 7a and 7b is moved in the direction opposite to that in FIG. 12B is opposite to that in FIG. 10B. As shown in FIG. 1 for the convergence correction of the device using the deflection yoke which does not have the multi-pole core and does not perform the swinging motion.
When a magnetic piece as shown in FIG. 2 (a) is used, unlike the case of swinging, there is almost no effect on the left-right unbalance of the vertical deflection magnetic field, so there is almost no effect on the YV axis deviation and the deflection There is almost no effect on distortion because it is applied at the electron gun side end of the yoke.

Therefore, a pair of magnetic pieces 7a and 7b as shown in FIG. 12A is arranged on the deflection yoke 9 having the sub-yoke 13 composed of the multi-pole core as shown in FIG. Convergence correction device 8 for XH axis deviation correction
It is quite natural to think of combining
As a result of making and testing a prototype, it was found that the following problems occur. The multi-pole core used in this prototype was an 8-pole ferrite core having a diameter of 68 mm and a thickness of 8 mm, and was placed about 10 mm behind the horizontal deflection coil. Further, the XH axis deviation correction magnetic pieces 7a and 7b are made of ferrite thin plates (thickness 1 mm) in three sizes (30 × 5, 22 ×).
Two sheets each were prepared and used. However,
The coil 14 is not provided in the 8-pole core (that is, the condition that a high magnetic permeability object is present in the rear part of the deflection yoke),
Further, the XH axis deviation correction pieces 7a and 7b have a magnetic piece interval (that is, a movable range) between the horizontal deflection coil and the 8-pole core at a position 6 mm from the horizontal coil so that the effect is not shielded by the 8-pole core. Placed as a parameter.

In an attempt to correct the XH axis shift under the above conditions, for example, the magnetic piece 7a, as in FIG.
When 7b is moved to the right when viewed from the tube surface, a phenomenon occurs in which the YV axis shift is changed as shown in FIG. Of course, when the magnetic pieces 7a and 7b are moved to the left, the change in convergence is opposite to that in FIG.

This is because the 8-pole core forming the sub-yoke 13 arranged at the end of the deflection yoke 9 on the electron gun side shields the leakage magnetic field from the deflection yoke 9 to the electron gun side for vertical deflection. The magnetic field distribution becomes complicated, and the vertical deflection magnetic field distribution, which should be hardly affected by the positions of the magnetic pieces 7a and 7b in the deflection yoke having no sub-yoke 13, is affected by the positions of the magnetic pieces 7a and 7b. It is considered that the YV axis shift has changed due to the left-right imbalance of the distribution. This phenomenon was measured only under the above conditions (that is, the deflection yoke provided with the sub-yoke 13 consisting of an 8-pole core), but an object with high magnetic permeability including the E-type and C-type cores is the deflection yoke. It is considered to be a phenomenon that occurs when it exists in the rear part (although the amount of change in YV axis deviation may be different).

14 and 15 show the results of measuring the change in the XH and YV axis shifts with this phenomenon under the above conditions, using the size of the XH axis shift correcting magnetic pieces 7a and 7b and the distance (movable range) between them as parameters. Show. 14 and 15, it can be seen that the larger the magnetic pieces 7a and 7b are and the larger the movable range ± x is, the larger the XH axis deviation correction amount and the YV axis deviation change amount are. The XH axis deviation correction amount is required to be about 0.8 mm or more. For that purpose, the largest magnetic piece (30 x 5 mm) is used and the movable range is ± 2.
Must be at least mm. At this time, the change in the YV axis shift is about 0.1 mm. This change in the YV axis shift is not a value that can be ignored, and results in disturbing the quality of convergence.

[0014]

A conventional color image display device having a deflection yoke having a sub-yoke composed of a multi-pole core and having an XH axis shift correcting device as shown in FIG. 12 is required. If an attempt is made to secure a correction amount for the XH axis deviation, the YV axis deviation becomes large, and the XH axis deviation and Y
There was a problem that any of the V-axis shifts could not perform good convergence correction. The present invention
It solves the above problems and has a simple structure and YV
It is an object of the present invention to provide a color image display device capable of correcting XH axis deviation without causing axis deviation.

[0015]

In the color image display device according to the first aspect of the present invention, three electron beams are generated along a horizontal deflection axis toward a phosphor screen coated with phosphors of three colors. A color picture tube having an in-line type electron gun, a deflection yoke having a horizontal deflection coil and a vertical deflection coil mounted on the color picture tube between the fluorescent screen and the electron gun for deflecting an electron beam, and a deflection yoke. In a color image display device including a sub-yoke formed of a multi-pole core arranged on the electron gun side of the first magnetic piece pair, the pair of first magnetic pieces are arranged at a predetermined interval with the electron beam on the horizontal deflection axis. Between the deflection yoke and the sub-yoke, there is provided a convergence correction device which holds the second pair of magnetic pieces arranged at a predetermined interval with the electron beam interposed therebetween on the vertical deflection axis and is movable in the horizontal deflection axis direction. Be prepared.

A color image display device according to a second aspect of the present invention is the color image display device according to the first aspect, wherein the convergence correction device is provided with a handle portion. A color image display device according to a third aspect of the present invention is the color image display device according to the first or second aspect, in which the convergence correction device is provided with fixing means for fixing the convergence correction device at a desired position within a moving range in the horizontal deflection axis direction. Is. A color image display device according to a fourth aspect of the present invention is the color image display device according to the first aspect.
In any one of the color image display devices described above, a ferrite material magnetic piece is used for the first magnetic piece pair arranged in the convergence correction device. A color image display device according to claim 5 of the present invention is the color image display device according to any one of claims 1 to 4, wherein a silicon steel plate magnetic piece is used for the second magnetic piece pair arranged in the convergence correction device. It was what I had.

[0017]

According to the first aspect of the present invention, the first magnetic piece pair arranged at a predetermined interval with the electron beam sandwiched on the horizontal deflection axis and the predetermined interval with the electron beam sandwiched on the vertical deflection axis. Since the convergence correction device that holds the second pair of magnetic pieces arranged in step S1 and is movable in the horizontal deflection axis direction is provided between the deflection yoke and the sub-yoke composed of the multi-pole core, the XH has a simple structure. The YV axis deviation due to the correction of the axis deviation can be canceled, and the left and right imbalances of the vertical deflection magnetic field distribution and the horizontal deflection magnetic field distribution are set by setting the interval between the first and second magnetic piece pairs to an appropriate predetermined value. When correcting the convergence loss due to any one of the above, the influence on the magnetic field distribution of the other can be suppressed to such an extent that there is no practical problem and the correction can be easily performed within an appropriate range.

According to the second aspect of the present invention, since the convergence correction device is provided with the handle portion, the adjustment work for the correction by the convergence correction device is facilitated. In the third aspect of the present invention, since the convergence correction device is provided with the fixing means for fixing the convergence correction device at a desired position within the movement range in the horizontal deflection axis direction, the adjustment work for the correction by the convergence correction device becomes easier. . According to the fourth aspect of the present invention, since the ferrite magnetic piece having good frequency characteristics is used for the first magnetic piece pair arranged in the convergence correction device, it is possible to cope with a horizontal deflection magnetic field having a high frequency and to obtain a good convergence. Can be corrected. According to the fifth aspect of the present invention, since the second magnetic piece pair provided in the convergence correction device is not required to have high frequency characteristics, the convergence correction device can be realized at low cost by using the silicon steel plate magnetic piece.

[0019]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In the figure, the same reference numerals as those in the conventional example represent the same as or equivalent to those in the conventional example. FIG. 1 is a view showing an embodiment of a color image display device according to the present invention, in which a neck portion 16
It is a schematic block diagram seen from the side. FIG. 2 is a side view of the first embodiment shown in FIG. Before carrying out the first embodiment shown in FIGS. 1 and 2, as a method for solving the above-mentioned conventional problems, as shown in FIG. 3, a convergence correction device 8 for the purpose of correcting the conventional XH axis deviation is provided. It was examined what would happen if only the magnetic piece pairs 10a and 10b for YV axis shift correction were provided.

Since the YV axis shift is caused by the left-right unbalance of the vertical deflection magnetic field distribution, the YV axis shift correction is performed by the magnetic piece as in the XH axis shift correction, as shown in FIG. 3A. A convergence correction device 8 capable of moving a pair of magnetic piece pairs 10a and 10b arranged so as to sandwich an electron beam on the deflection axis to the left and right along the horizontal deflection axis is arranged at the electron gun side end of the deflection yoke 9. Do by things. For example, when the pair of magnetic pieces 10a and 10b are moved to the right as viewed from the tube surface as shown in FIG. 3B, left and right imbalance occurs in the vertical deflection magnetic field 5, and the pair of magnetic pieces 10a and 10b move vertically. 3 when compared to when the position is symmetrical with respect to FIG.
The YV axis shift as shown in (c) occurs.

By the way, in the conventional XH axis deviation correction shown in FIGS. 12 and 13, the change of the YV axis deviation and the moving direction of the pair of magnetic pieces 7a and 7b, and the YV axis deviation correction shown in FIG. Change in YV axis shift and pair of magnetic pieces 10a, 1
When comparing the direction of moving 0b, that is, comparing FIG. 13 and FIG. 3 (c), if the directions of moving the magnetic piece pairs 7a and 7b and the magnetic piece pairs 10a and 10b are the same, the change in the YV axis shift will occur. It is in the opposite direction. Therefore, it has been found that the configuration shown in FIG. 3 can be introduced as a means for canceling the YV axis shift associated with the XH axis shift correction.

Here, the YV axis deviation correction effect using the pair of magnetic pieces 10a and 10b was measured under the same conditions as in the measurement of the XH axis deviation correction effect (specification of the sub-yoke having an 8-pole core, positional relationship, and magnetic piece). Confirmation was made at (insertion position). The magnetic piece pair 10a, 10b uses two silicon steel plates (30 × 3 mm, thickness 0.5 mm), and the movable range of the magnetic piece pair is ± 4 mm.
And ± 3 mm, and the magnetic piece spacing was set as a parameter. Now, the change in YV axis deviation measured under the above conditions is
For example, when the pair of magnetic pieces 10a and 10b is moved to the right as viewed from the tube surface as shown in FIG. 3B, the change is as shown in FIG. 4 and the XH axis shift also changes. As can be seen from FIGS. 13 and 4, the direction of change in the XH axis shift in YV axis shift cancellation changes in the direction opposite to the direction in which the XH axis shift is corrected, but as will be described below, the XH axis shift is changed. It is a small value with respect to the correction amount, and there is no problem if the setting of the XH axis shift correction amount is made large.

This phenomenon is solved by the magnetic piece pair 10 for YV axis deviation correction.
FIG. 5 shows the results of measurement using the intervals a and 10b and the movable range as parameters. From FIG. 5, a pair of magnetic pieces 10a,
As the distance between 10b is narrower and the movable range is larger, Y
It can be seen that the V-axis deviation correction amount and the XH-axis deviation change amount increase. It can be seen from FIG. 5 that the YV axis shift cancellation amount is about 0.1 mm from the required XH axis shift correction amount, and the XH axis shift change that occurs at that time is about 0.05 mm. This is a smaller value than the value of the XH axis deviation to be corrected, and there is almost no effect of reducing the correction amount (of course, if the set value of the XH axis deviation correction amount is made large, the reduction amount is a concern. You don't have to). Therefore, in a deflection yoke having a multi-pole core at the rear,
The YV axis shift change that occurs along with the XH axis shift correction using the magnetic piece pairs 7a and 7b as shown in FIG. A pair of magnetic piece pairs 10a and 10b arranged so as to sandwich the electron beam on the vertical deflection axis are arranged on the convergence correction device 8 which is movable by, and the magnetic piece pair 10a, It was confirmed that the change in the YV axis shift can be effectively canceled by appropriately selecting the size of 10b or the distance from the horizontal deflection axis.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a pair of magnetic pieces 7a and 7b for XH axis shift correction, which is a first pair of magnetic pieces, and a pair of magnetic pieces 10 for canceling YV axis shift change, which is a second pair of magnetic pieces.
It is the figure which arranged a and 10b on the convergence correction device 30 which is the same magnetic piece holding member. A neck portion 16 of an in-line type color picture tube is inserted into the convergence correction device 30 at a substantially central portion thereof, and a long hole 1 elongated in the horizontal deflection axis direction is provided so as to be movable in the horizontal deflection axis direction.
1 is provided. XH axis misalignment correctable amount is 0.8mm
Further, if the movable range of the magnetic piece pair, that is, the convergence correction device 30 which is a holding member of the magnetic piece pair, is too small, it becomes difficult to make fine adjustments. .

In order to satisfy the above condition, from the above measurement results, the magnetic piece pair 7a, 7b for correcting the XH axis deviation is 30 ×.
A 5 mm rectangular shaped ferrite plate with a thickness of 1 mm is arranged at an interval of 39 mm, and YV axis deviation canceling magnetic pieces 10a, 10b are formed with a rectangular 30 × 3 mm silicon steel plate having a thickness of 0.5 mm at an interval of 39 mm. Placed respectively. The magnetic piece pair 7a, 7b for correcting the XH axis shift is intended to induce the left-right unbalance of the horizontal deflection magnetic field having a high frequency, and therefore is long in the direction along the horizontal deflection magnetic field and
It is possible to obtain a higher effect by adopting a ferrite material having an excellent frequency characteristic that can cope with the horizontal deflection frequency of the multi-scan type color image display device.

Further, the magnetic piece 1 for canceling the YV axis deviation.
Regarding 0a and 10b, since the purpose is to induce left-right imbalance of the vertical deflection magnetic field having a low frequency, frequency characteristics are not so required, and a silicon steel plate long in the direction along the vertical deflection magnetic field is adopted. As a result, the change in the YV axis shift can be canceled inexpensively and effectively. Further, the method of attaching the above-mentioned magnetic piece pairs 7a, 7b and 10a, 10b to the convergence correction device 30 cannot be specifically described, but any method can be used as long as it can be securely fixed. Secondary yoke 13 consisting of an 8-pole core
Is the convergence correction device 30 as shown in FIG.
It is arranged on the electron gun side of, and its positional relationship is the same as the above-mentioned measurement condition (horizontal coil, 8-pole core 10 mm.
6 mm between the horizontal coil and the magnetic piece holding plate. ).

The convergence correction device 30 holding the magnetic piece has a width of about the outer diameter of the neck portion 16 accommodating the electron gun portion of the in-line type color picture tube so that the convergence correction device 30 can move right and left along the horizontal deflection axis. It has a long hole 11 (having a length of about the moving range) in the horizontal deflection axis direction and is configured to be movable in the horizontal deflection axis direction without being affected by the neck portion 16. Further, the convergence correction device 30 holding the magnetic piece is attached to the deflection yoke 9 so as not to rotate about the tube axis and to move left and right without tilting with respect to the tube axis. (The device for this is not shown here)

Here, when the XH axis shift correction is performed using the convergence correction device 30 according to the specifications of the above-described conditions, the XH axis shift correctable amount, the YV axis shift change amount, and the distortion (upper and lower left and right pins and trapezoidal distortion). ), The XH axis deviation can be corrected up to 0.8 mm,
In addition, the change in the YV axis deviation is practically no problem.
It was suppressed to less than mm (nearly 0 mm). Further, regarding the strain, although the measurement data is not shown, changes in the vertical and horizontal pins and the trapezoidal strain were within 0.1%.

Two pairs of magnetic pieces 7a, 7b and 1 are used.
The sizes, positions, and movement ranges of 0a and 10b are not particularly limited, and are appropriately determined according to the XH axis deviation correction amount and the YV axis deviation change cancel amount. Basically, first, the size, the position and the moving range of the magnetic piece pair 7a, 7b for XH axis shift correction are determined so as to be the XH axis shift correction amount desired by the designer, and then the YV axis shift change cancel amount is determined. Accordingly, the size and position of the YV axis shift change canceling magnetic piece pair 10a, 10b may be determined.

Further, the above has described the case of the XH axis deviation correction by the left and right imbalance of the horizontal deflection magnetic field distribution. However, when it is applied to the YV axis deviation correction by the left and right imbalance of the vertical deflection magnetic field distribution, as described above. First, after determining the size, the position and the moving range of the magnetic piece pair 7a, 7b for XH axis deviation correction, the size and the position of the magnetic piece pair 10a, 10b for canceling the YV axis deviation change are not decided. First, a pair of magnetic pieces 10a and 10b for correcting the YV axis deviation.
, The position, and the movement range of the XH axis deviation change canceling magnetic piece pair 7a, 7 are determined according to the XH axis deviation change canceling amount.
Needless to say, by determining the size and position of b, it is possible to correct the YV axis shift without changing the XH axis shift.

Embodiment 2 FIG. FIG. 7 shows a case in which the handle portions 12a and 12b are provided in the convergence correction device 30 holding the pair of magnetic pieces in the first embodiment.
By adopting such a configuration, the movement work of the convergence correction device 30 can be easily performed, so that the workability can be improved. The size, shape, mounting position, number, etc. of the handle portions 12a or 12b are not particularly limited, and may be appropriately determined according to workability or available space.

Example 3. FIG. 8 shows an example in which a fixing means for fixing the convergence correction device 30 to the desired position in the horizontal axis direction is further provided in the second embodiment. Reference numeral 40 is an example of a fixing means, and for example, as shown in FIG. 8, a plurality of cutout portions or groove portions 41 and a plurality of cutout portions or groove portions 41 provided on the side surface portion of the convergence correction device 30 are provided. The lock member 42 is in mesh with each other. Although not shown, the lock member 42 is elastically pressed against the cutout portion or the groove portion 41, so that the convergence correction device 30 is movable in the horizontal deflection axis direction, and the lock member 42 is movable. 42 is fixed at a position where it meshes with the notch or the groove 41. Therefore, by adopting this embodiment, it is possible to fix the convergence correction device 30 at a position where the convergence correction is optimum or close to it, and the workability is further improved.

[0033]

According to the first aspect of the present invention, the first arrangement is such that the electron beam is sandwiched on the horizontal deflection axis at a predetermined interval.
And a second magnetic piece pair disposed at a predetermined interval with the electron beam sandwiched between the magnetic piece pair and the vertical deflection axis, and a convergence correction device that is movable in the horizontal deflection axis direction. Since it is provided between the sub-yoke composed of a multi-pole core and a multi-pole core, it is possible to cancel the YV axis deviation due to the correction of the XH axis deviation with a simple structure, and to set the interval between the first and second magnetic piece pairs to an appropriate predetermined value. By setting it to a value, when correcting the convergence loss due to either the left or right unbalance of the vertical deflection magnetic field distribution and the horizontal deflection magnetic field distribution,
On the other hand, there is an effect that the influence on the magnetic field distribution can be suppressed to such an extent that there is no practical problem, and the correction can be easily performed within an appropriate range.

According to the second aspect of the present invention, since the convergence correction device is provided with the handle portion, there is an effect that the workability of the convergence correction work can be improved. According to the third aspect of the present invention, the convergence correcting device is provided with the fixing means for fixing the convergence correcting device at a desired position within the movement range in the horizontal deflection axis direction. Therefore, the convergence correcting device can be easily installed at the optimum position after the convergence correction. Can be fixed,
There is an effect that the workability of the correction work can be further improved. According to the fourth aspect of the present invention, since the ferrite material having good frequency characteristics is used for the first magnetic piece pair arranged in the convergence correction device, good convergence correction can be performed even in the horizontal deflection magnetic field of high frequency. effective. According to the fifth aspect of the present invention, since the second magnetic piece pair arranged in the convergence correction device does not require high frequency characteristics, it is possible to use a low-priced silicon steel plate material, which makes it cheaper. There is an effect that the device can be realized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a convergence correction device for a color image display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a position where a convergence correction device in Embodiment 1 of the present invention is arranged.

FIG. 3 is a diagram showing a case where only a magnetic piece pair for YV axis deviation correction is provided in a convergence correction device for the purpose of correcting XH axis deviation in the related art.

FIG. 4 is a conceptual diagram showing a state of change in convergence deviation by the convergence correction device in FIG.

FIG. 5 is a diagram showing the measurement conditions and the results of convergence convergence using the convergence correction device of FIG.

FIG. 6 is a graph of the results shown in FIG.

FIG. 7 is a schematic configuration diagram of a convergence correction device for a color image display device according to a second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a convergence correction device for a color image display device according to a third embodiment of the present invention.

FIG. 9 is a schematic view of a deflection yoke peripheral portion of a conventional color image display device.

FIG. 10 is a diagram for explaining an XH axis shift.

FIG. 11 is a diagram for explaining a YV axis shift.

FIG. 12 is a schematic configuration diagram of a conventional convergence correction device for performing XH axis shift correction.

13 is a conceptual diagram showing a change state of convergence convergence when the correction is performed by the convergence correction device in FIG.

FIG. 14 is a diagram showing the measurement conditions and the results of convergence convergence using the convergence correction device of FIG.

FIG. 15 is a graph showing the results shown in FIG.

[Explanation of symbols]

1 Horizontal Deflection Magnetic Field 5 Vertical Deflection Magnetic Field 7a, 7b XH Axis Misalignment Correction First Magnetic Piece Pair 10a, 10b YV Axis Misalignment Correction Second Magnetic Piece Pair 9 Deflection Yoke 13 Sub-Yoke 30 Convergence Correction Device 12a, 12b handle 40 fixing means

Claims (5)

[Claims] 1. A color picture tube having an in-line type electron gun for generating three electron beams along a horizontal deflection axis toward a phosphor screen coated with phosphors of three colors, and the phosphor screen. A deflection yoke, which is mounted on the color picture tube between the electron guns and has a horizontal deflection coil and a vertical deflection coil for deflecting the electron beam, and a multipole arranged on the electron gun side of the deflection yoke. In a color image display device including a sub-yoke composed of a core, a pair of first magnetic pieces arranged at a predetermined interval sandwiching the electron beam on a horizontal deflection axis and the electron beam on a vertical deflection axis. A convergence correction device that holds the second pair of magnetic pieces arranged at a predetermined interval sandwiching them and is movable in the horizontal deflection axis direction is provided between the deflection yoke and the sub-yoke. Color image Display device. 2. The color image display device according to claim 1, wherein the convergence correction device has a handle portion. 3. The color image display device according to claim 1, wherein the convergence correction device has fixing means for fixing the convergence correction device at a desired position within a moving range in the horizontal deflection axis direction. . 4. The color image display device according to claim 1, wherein the first magnetic piece pair disposed in the convergence correction device uses a ferrite material magnetic piece. 5. The color image display device according to claim 1, wherein the second magnetic piece pair disposed in the convergence correction device is a silicon steel sheet magnetic piece.