JPH04312749A - Color picture tube device - Google Patents

Abstract

PURPOSE:To provide a color picture tube capable of correcting various cross miss convergence patterns. CONSTITUTION:Saturation control coils 63a, 63b are wound in the directions of generating magnetic fields of arrows Mva, Mvb close to saturable cores 61a, 61b having auxiliary cores 65a, 65b on end parts and forming a magnetic circuit. The arrows Mva, Mvb show the directions in which the magnetic fields are mutually increased in the magnetic circuit. On the outside of the saturation control coils 63a, 63b, impedance control coils 64a, 64b, 64c, 64d to be connected to a horizontal deflecting coil are wound in the directions of generating magnetic fields of arrows Mha, Mhb, Mhc, Mhd. Further, magnets 62a, 62b are disposed on the outside of the auxiliary cores 65a, 65b, and magnetic fields shown by arrows Ma, Mb are applied to the saturable cores 61a, 61b.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube device, and more particularly to a color picture tube device equipped with a saturable reactor that makes it possible to correct a wide variety of cross-misconvergence patterns on a screen.

0002

2. Description of the Related Art Generally, a color picture tube device has a panel 1 and a funnel 2 which are joined together, as shown in FIG.
The inner surface of the panel 1 is provided with three colors emitting light in blue, green, and red, facing the shadow mask 3 which is mounted inside the panel 1 and has a large number of electron beam passage holes. A phosphor screen 4 made of a phosphor layer is formed,
Three electron beams BR, BG, and BB emitted from an electron gun 6 disposed inside the neck 5 of the funnel 2 are deflected by a magnetic field generated by a deflection yoke 7 attached to the outside of the funnel 2, and the above-mentioned fluorescent light is The phosphor screen 4 is structured to display a color image on the phosphor screen 4 by scanning the phosphor screen 4 horizontally and vertically. The deflection yoke 7 that deflects the electron beams BR, BG, and BB as described above is
As shown in FIG. 8, normally, a pair of saddle-type horizontal deflection coils 11 are provided, through which a horizontal deflection current for deflecting and scanning an electron beam in the horizontal direction flows, and a vertical deflection current for deflecting and scanning an electron beam in the vertical direction flows. It mainly consists of a pair of vertical deflection coils 12 through which the current flows, and a separator 13 between the horizontal deflection coil 11 and the vertical deflection coil 12. In FIG. 8, the vertical deflection coil 12 is a pair of upper and lower toroidal deflection coils, but a deflection yoke composed of a pair of left and right saddle-type deflection coils may also be used.

In such a color picture tube device, in particular, the electron gun is an in-line type electron gun that emits three electron beams arranged in a row, consisting of a center beam and a pair of side beams passing on the same plane. A self-convergence type in-line color picture tube device is widely used, which generates a non-uniform magnetic field in which the horizontal deflection magnetic field is pincushion-shaped and the vertical deflection magnetic field is barrel-shaped, and the three electron beams are self-focused by this non-uniform magnetic field. .

However, the deflection angle of the color picture tube device is 9
If the deflection magnetic field is set to have good convergence for something around 0°, pincushion-shaped or barrel-shaped distortion will occur in the upper and lower rasters, and if the distortion of the upper and lower rasters is optimized, misconvergence will occur. There was a problem.

FIG. 9 shows several cross misconvergence patterns in a conventional color picture tube device. Regarding correction of such a cross misconvergence pattern, conventionally, Japanese Patent Laid-Open No. 57-206184 and Japanese Patent Laid-Open No. 2-194791 disclose a differential method in which the current flowing through a pair of horizontal deflection coils is synchronized with the vertical deflection. A color picture tube device is shown that includes a saturable core that corrects misconvergence by changing the shape of the horizontal deflection magnetic field over time.

FIG. 10 shows a structure proposed in Japanese Patent Laid-Open No. 2-194791 as an example of a saturable reactor which is a misconvergence correcting means in a conventional color picture tube device. This is connected to the upper horizontal deflection coil 11a of the pair of upper and lower horizontal deflection coils, and the saturable core 20
Impedance control coil 21 wound around a and 20b
a, 21b, impedance control coils 21c, 21d connected to the lower horizontal deflection coil 11b and wound around the saturable cores 20c, 20d, and vertical deflection coils 12a, 1
The saturation control coil 22 connected to 2b and the magnet 2
It is composed of 3. Impedance control coil 2
The wound saturable cores 20a, 20b, 20c, 20d of 1a, 21b, 21c, 21d are adjacent to the magnet 23, and the impedance control coils 21a, 21b
, 21c and 21d are biased in opposite directions by static magnetic fields generated by the magnet 23. The impedance control coils 21a, 21b and 21c, 21d are equivalent coils wound in opposite directions, and are configured to cancel the magnetic field generated by the impedance control coils themselves. The saturation control coil 22 includes impedance control coils 21a, 21b, 21c, and 21d and a magnet 23.
The impedance control coils 21a, 21b, 2
The inductances of 1c and 21d are changed in synchronization with the vertical deflection. This change is caused by, for example, when a positive vertical deflection current, that is, a current when deflecting to the upper side of the screen, is applied, the magnetic field by the saturation control coil 22 is Then, the magnetic field generated by the magnet 23 is reduced, and the impedance control coils 21c and 21d connected to the lower horizontal deflection coil 11b work to increase the magnetic field generated by the magnet 23. As a result, the inductance of the impedance control coils 21a and 21b increases, and the inductance of the impedance control coils 21c and 21d decreases, creating a differential current in which the upper horizontal deflection current is smaller than the lower horizontal deflection current, and the upper horizontal deflection current of the screen increases. Correct the cross misconvergence pattern. Similarly, if a negative vertical deflection current is applied, that is, when the screen is deflected to the bottom, a differential current will be created such that the upper horizontal deflection current is larger than the lower horizontal deflection current, and the screen will be deflected downward. Correct side cross misconvergence pattern.

[0007] Further, as another configuration of the saturable reactor,
FIG. 11 shows a configuration proposed in Japanese Unexamined Patent Publication No. 14453/1983. This uses the leakage magnetic field from the vertical deflection coil instead of the saturation control coil. In the figures, the same numbers indicate the same things, and the basic operation is as described above.

Cross misconvergence patterns in conventional color picture tube devices are shown in FIGS. 9(a) and 9(b).
It had a pattern represented by However, in recent years, due to the flattening of color picture tube devices and the addition of complex convergence and distortion correction mechanisms, the amount of cross misconvergence at the top and bottom edges of the screen has increased, as shown in Figure 9(c). Patterns that are smaller than the amount of cross-misconvergence and patterns in which cross-misconvergence occurs only at the upper and lower ends of the screen, as shown in FIG. 9(d), are becoming more common.

[0009] As a means for correcting the pattern shown in FIG. 9(c), Japanese Patent Application Laid-Open No. 57-206184 discloses a method of reducing the magnetic field exerted by the magnet on the saturable core.
Means for moving the operating range of the saturation control coil have been proposed. However, in this case, the amount of correction is significantly reduced by reducing the magnetic field exerted by the magnet on the saturable core, the degree of freedom in design is reduced and the correction pattern is extremely limited, and the upper and lower edges of the screen There are practical problems such as the difficulty of reducing the correction amount to completely zero.

[0010]Also, a method has been proposed in which a reverse correction mechanism is added by introducing a diode into the saturation control coil system. There are problems such as the occurrence of undesirable phenomena on the screen due to sudden correction changes.

In this way, conventionally, FIGS. 9(a) and 9(b)
Although the cross misconvergence pattern shown in FIG. 9 can be appropriately corrected, it was difficult to correct the cross misconvergence pattern shown in FIGS. 9(c) and (d). The reason for this will be explained in detail below with reference to FIGS. 12 to 14 in terms of the functions of the impedance control coil, saturation control coil, saturable core, and magnet.

Generally, since the impedance control coil is wound around a saturable core, the inductance L of the impedance control coil is proportional to the magnetic permeability μ of the saturable core and the square of the number of turns n.

Further, the magnetic permeability μ of the saturable core is uniformly determined by the relationship between the magnetic field H applied to the saturable core from the outside and the magnetic field B generated as a result of magnetization, that is, the B-H characteristic. , a schematic diagram of the B-H characteristic of the saturable core is shown in curve 31 of FIG. 12(a). In FIG. 12(a), Hs represents an external magnetic field that almost completes the magnetization saturation of the saturable core. In the case of a saturable core material with negligible hysteresis (in the case of a general saturable core, hysteresis is negligible), changes in the magnetic permeability μ of the saturable core are caused by changes in the saturable core from the outside. When the magnetic field H generated is zero (H=0), it takes the maximum value μmax,
In the region of 0<H<Hs, the magnetic permeability μ decreases as H increases, and in the supersaturated region of H>Hs, it becomes approximately equal to the saturated magnetic permeability μs. In addition, since the inductance L of the impedance control coil is approximately proportional to the magnetic permeability μ of the saturable core as described above, the inductance L of the impedance control coil is shown as the curve 32 in FIG. Like L-H
Show characteristics.

The cross misconvergence correction effect in an actual saturable reactor will be explained based on FIG. 13. As shown in FIG. 13(a), the external magnetic field H applied to the saturable core is the magnetic field H biased by the magnet.
mag and the magnetic field Hv caused by the saturation control coil. At this time, there is also a magnetic field generated by the impedance control coil itself, but this is usually canceled by making the impedance control coils into a pair of equivalent coils wound in opposite directions. Also, Hmag is the static magnetic field, Hv
is a magnetic field that varies with the vertical deflection period and is generally proportional to the vertical deflection current Iv, and Hv takes the maximum value Hvm (-Hvm) when deflected to the top (or bottom) of the screen. Magnetic field Hv exerted on the saturable core around which the impedance control coils connected to the upper and lower horizontal deflection coils are wound
is in the opposite direction to Hmag on the one hand and Hma on the other hand
It is configured to be in the same direction as g. As a result, the inductance Lu of the impedance control coil connected to the upper horizontal deflection coil and the inductance Ld of the impedance control coil connected to the lower horizontal deflection coil are equal to the magnetic field Hmag biased toward the upper saturable core.
When considered as a reference, it changes as shown by curves 41 and 42 in FIG. 13(a). That is, at Hv = 0, that is, at the center of the screen, the inductances Lu and Ld of the impedance control coil are both the same as the inductance L in the external field H = Hmag, and the vertical deflection current Iv
When energized, a magnetic field H is applied to the saturable core from the saturation control coil.
v is generated, and a magnetic field of Hv +Hmag is applied to the upper saturable core around which the impedance control coil connected to the upper horizontal deflection coil is wound, and the impedance control coil connected to the lower horizontal deflection coil is wound. A magnetic field of Hv - Hmag is applied to the lower saturable core, and the relationship between the inductances of these impedance control coils is Lu<Ld. Also, Hmag and Hv
If the relationship is reversed, Lu>Ld can also be satisfied. Furthermore, this selection is appropriately determined depending on the cross misconvergence pattern to be corrected.

As described above, the inductances Lu and Ld of the impedance control coil change depending on the time change of the magnetic field generated by the saturation control coil, that is, depending on the vertical deflection period. If this change is replaced by the vertical deflection current Iv instead of the external field H, the characteristics will be as shown by curves 43 and 44 in FIG. 13(b). In other words, H=Hm in FIG. 13(a)
This is a curve with an operating region of 2×Hvm centered on ag. Furthermore, in general, in this operating region, for example, when considering the inductance Lu, the magnitude of the external field H is usually smaller than the saturation end magnetic field Hs, where the magnetization saturation of the saturable core almost ends, and larger than zero. This is a saturable region where 0<H<Hs.

Further, the cross-mistake convergence correction amount is approximately proportional to the magnitude of the inductance difference Lu-Ld, and the relationship between the cross-mistake convergence correction amount and the vertical deflection current Iv is shown by the curve 45 in FIG. 13(c). It has the characteristics shown below. The characteristics shown in FIG. 13(c) are typical correction characteristics of the conventional example, and for the cross-misconvergence patterns shown in FIGS. Appropriate adjustment can be made by appropriately setting the number of turns and the number of turns of the saturation control coil.

However, in the characteristic shown in FIG. 13(c), since the amount of correction increases toward the top and bottom edges of the screen, the amount of cross misconvergence at the middle of the top and bottom of the screen is larger than the amount of cross misconvergence at the top and bottom edges of the screen. It is not possible to correct a cross misconvergence pattern as shown in FIG. 9(c).

[0018] For this reason, as mentioned above,
No. 06184 proposes means for correcting the cross misconvergence pattern as shown in FIG. 9(c) by reducing the magnetic bias amount Hmag by the magnet and moving the operating range of the saturation control coil. There is. As shown in FIG. 14, with respect to curve 51 which is the L-H characteristic, the magnetic bias amount Hmag due to the magnet is made smaller than A to B, and the operating range of the magnetic field Hvm acting on the saturable core is set to C. be. In other words, the magnetic bias amount Hmag is decreased so that Hvm>Hmag, without changing the size of the operating region 2×Hvm. However, in this case, the magnetic bias amount H
By decreasing mag, the difference in inductance of the impedance control coil shown in FIG. 13(b) | Lu−L
d| is significantly reduced, making it difficult to obtain an appropriate correction amount; the degree of freedom in designing the magnetic bias amount Hmag is reduced, and the correction pattern becomes extremely limited;
To make the correction amount at the upper and lower ends smaller than at the upper and lower middle parts, press H.
Although it is necessary to expand the operating range to approximately vm=Hs+Hmag, there are practical problems such as structural problems and difficulty in reducing the amount of correction at the upper and lower ends to completely zero.

[0019]

[Problems to be Solved by the Invention] As mentioned above, conventionally proposed means cannot correct the unique pattern in which the amount of cross misconvergence at the top and bottom edges of the screen is smaller than the amount of cross misconvergence at the top and bottom middle portions. Sufficient correction could not be made, which was a major hindrance to improving convergence characteristics.

Therefore, the present invention has a high degree of design freedom that allows correction of various cross misconvergence patterns without increasing the deflection power loss of the saturation control coil or increasing the size of the saturable reactor, and provides good convergence characteristics. The purpose of this invention is to provide a color picture tube device. [Structure of the invention]

[0021]

[Means for Solving the Problems] In order to solve the above problems, the inventor conducted research on saturable reactors and found that conventionally, as shown in FIG. 13(a), the upper saturable core and the lower Both saturable cores have the maximum value of the external field Hmag
It is normal to operate in a saturable region where +Hvm is smaller than the saturation end magnetic field Hs, and in this application, even in a region where the upper saturable core is magnetically saturated, the magnetic permeability of the lower saturable core changes greatly. It focuses on the existence of regions. In other words, the operating region of the saturable reactor, which conventionally only utilized the saturated region in the Hmag direction, is
Hvm without changing the amount of magnetic bias caused by the magnet.
By increasing Hvm>Hmag +Hs, H
It has been found that by expanding and utilizing the saturation region in the direction opposite to mag, it is possible to correct a cross misconvergence pattern as shown in FIG. 9(c).

However, in the conventional structure, the operating region is
It is very difficult to expand until vm>Hmag +Hs. First of all, in order to increase Hvm in the conventional structure, it is sufficient to simply increase the number of turns of the saturation control coil, but a significant increase in the number of turns causes an increase in the resistance and inductance of the saturation control coil, which is a practical problem. This is because the increase in the number of coil turns increases the resistance, the coil winding space, and the distance between the saturable core and the coil. In other words, the magnetic field Hv exerted by the saturable control coil on the saturable core is attenuated in proportion to the reciprocal of the square of the distance between the saturable control coil and the saturable core, and as a result, Hvm increases in proportion to the number of turns. Instead, it reaches a plateau. Second, in practice, in the conventional structure Hvm>Hm
Achieving ag +Hs is extremely difficult also in terms of coil winding space. That is, in order to increase Hvm, the coil winding space increases as described above, and this increase in coil winding space undesirably increases the size of the saturable reactor. Furthermore, since the magnetic field leaking from the saturation control coil increases, there is also a problem in terms of measures against leakage magnetic field.

Additionally, in conventional configurations, the impedance control coil is generally wound close to the saturable core;
Since the saturation control coil is wound outside the saturation control coil and the saturable core forms an open magnetic path, the loss of magnetic flux generated by the saturation control coil due to magnetic resistance increases. This is due to the need to maintain insulation between the impedance control coil and the saturation control coil, deflection sensitivity, and assembly issues. In other words, the inductance of the coil increases as the cross-sectional area of the coil increases, so the inductance of the impedance control coil that does not contribute to deflection must be as small as possible, and by winding it close to the saturable core, the cross-sectional area can be reduced. I'm keeping it small. Also, considering assembly, it is better to have as few coils as possible. At least four impedance control coils are required to cancel the magnetic field generated by the coil itself, but one saturation control coil may be used. 1 saturation control coil
In this case, the impedance control coil must be wound outside the impedance control coil, which results in an increase in the distance between the saturation control coil and the saturable core.

Therefore, the present invention is based on the viewpoint of expanding the operating range of the saturable reactor, and in order to achieve this, each pair of horizontal and vertical deflection coils for deflecting a plurality of electron beams emitted from an electron gun is provided. and a saturable reactor that corrects misconvergence by differentially changing the current flowing through the pair of horizontal deflection coils in synchronization with the vertical deflection and changing the shape of the horizontal deflection magnetic field in synchronization with the deflection. In a color picture tube device comprising:
The saturable reactor includes at least one saturable core, at least one saturable control coil wound around the saturable core and through which a vertical deflection current flows, and wound adjacent to the saturable control coil and arranged oppositely to each other. at least one horizontal deflection coil connected to the horizontal deflection coil to generate a oriented magnetic field.
It is composed of a pair of impedance control coils and a magnet that applies a magnetic bias to the saturable core, and the ends of the saturable core are magnetically coupled to form a magnetic circuit with low magnetic resistance. Features.

[0025]

[Operation] By magnetically connecting the ends of the saturable core around which the saturation control coil is wound, a magnetic circuit with low magnetic resistance is constructed, preventing the loss of magnetic flux due to magnetic resistance, and directing the magnetic flux into the magnetic circuit. It is possible to generate a large magnetic flux by concentrating on the Furthermore, by winding the impedance control coil adjacent to the saturation control coil, a portion on which a large magnetic flux is applied by the saturation control coil is used as a saturable core operating portion. Furthermore, by concentrating the magnetic flux in the magnetic circuit as described above, the magnetic field leaking to the outside is reduced.

By configuring the magnetic circuit described above, winding the saturation control coil around the saturable core, and winding the impedance control coil adjacent to the saturation control coil, the saturation control coil and the saturable core can be connected. By reducing the distance, the attenuation of Hv can be suppressed, and the operating range of the inductance L of the impedance control coil can be expanded without increasing the resistance of the saturation control coil. By making it possible to use up to the saturation region in the opposite direction to Hmag as shown in , the degree of freedom in designing the correctable pattern is improved, and the inductance Lu of the impedance control coil connected to one horizontal deflection coil of a pair of horizontal deflection coils is improved. Since the difference between the inductance Ld and the inductance Ld of the impedance control coil connected to the other horizontal deflection coil can be made sufficiently large, the amount of correction can be made large. Furthermore, by expanding the operating region and using a wide region of the L-H characteristic, and by changing the design values of Hvm and Hmag, the characteristic curve shape of the cross misconvergence correction amount for the vertical deflection current Iv can be appropriately set. .

[0027]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Example 1)

FIG. 1 shows an embodiment of a saturable reactor used in a color picture tube device according to the present invention. FIG. 1 shows a cross-sectional view and a schematic plan view of a saturable reactor, and FIG. 2 is a circuit diagram.

FIG. 1(a) shows the configuration of a saturable reactor, and FIG. 1(b) schematically shows the direction of the magnetic field generated within the saturable reactor. The saturable reactor 60 includes two saturable cores 61a and 61b and two magnets 62a and 62.
b, two saturation control coils 63a, 63b, and four impedance control coils 64a, 64b, 64c, 6
4d, auxiliary cores 65a, 65b, and insulation mold 6
6a and 66b.

The saturation control coils 63a and 63b are connected in series to the vertical deflection coils 68a and 68b as shown in FIG. It is wound close to 61a and 61b. Impedance control coil 64a,
64b, 64c, 64d are connected to a pair of upper and lower horizontal deflection coils 67a, 67b, as shown in FIG.
Saturation control coil 6 via insulation molds 66a, 66b
Adjacent to 3a, 63b on the outside, arrows Mha, Mh
They are wound in directions that generate magnetic fields of b, Mhc, and Mhd. Arrows Mha, Mhb, and arrows Mhc, Mhd
The reason why the directions are opposite to each other is to cancel the magnetic fields generated by the impedance control coils 64a, 64b, 64c, and 64d. In addition, the magnetic field M generated by the saturation control coils 63a and 63b
va and Mvb are opposite to each other so that the magnetomotive force of the coil is increased with respect to the magnetic circuit consisting of the saturable cores 61a and 61b and the auxiliary cores 65a and 65b, and therefore the magnets 62a and 62b are , saturable core 61a
, 61b via auxiliary cores 65a and 65b to generate magnetic fields in the same direction as Mva and in the opposite direction to Mvb, respectively, and the magnetic fields indicated by arrows Ma and Mb are applied to the saturable core 61a.
, 61b.

In this embodiment, the saturable cores 61a, 61b
uses a cross-sectional area and material that is approximately the same as the conventional example shown in FIG. 10, and has a length of approximately 20 mm. The saturable control coils 63a, 63b are the saturable cores 61a, 61
The impedance control coils 64a, 64b, 64c, 64d are connected to a pair of equivalent coils via insulating molds 66a, 66b outside the saturation control coils 63a, 63b. are about 7m each
They are wound in opposite directions to a width of m. A space of approximately 3 mm is provided between the equivalent coils to reduce the mutual inductance between the equivalent coils. The auxiliary cores 65a, 65b that magnetically connect the saturable cores 61a, 61b have a thickness of 5 mm, and are made of a material with a higher saturation magnetic flux density than the saturable cores 61a, 61b. . The magnets 62a, 62b are connected to the saturable cores 61a, 61a from the outside of the auxiliary cores 65a, 65b.
1b is biased with a magnetic field of magnitude Hmag. In this way, by designing the saturation end magnetic field that provides the saturation magnetic flux density of the auxiliary cores 65a, 65b to be higher than the saturation end magnetic field of the saturable cores 61a, 61b, an increase in magnetic resistance due to magnetization saturation of the auxiliary cores themselves can be prevented. The magnetic flux in the magnetic circuit is maximized. Furthermore, even if the auxiliary core and the saturable core are made of the same material, an increase in the magnetic resistance of the auxiliary core itself can be prevented by devising the shape.

Next, the effect of improving the magnetic field generation efficiency of the saturation control coil in the above configuration will be explained. In this embodiment, as described above, the distance between the saturable control coils 63a, 63b and the saturable cores 61a, 61b is reduced by winding the saturable control coils 63a, 63b close to the saturable cores 61a, 61b. Make the saturation control coils 63a, 63 as small as possible.
b suppresses attenuation due to distance of the magnetic field exerted on the saturable cores 61a and 61b. In addition, the impedance control coils 64a, 64b, 64c, and 64d are replaced by the saturation control coil 6.
By winding the impedance control coils 3a and 63b adjacent to the outside, the core region where saturation by the saturation control coil is most likely to occur can be used as the saturable core operating section. By increasing the distance between and the saturable cores 61a and 61b,
This improves the canceling effect of the magnetic field generated by the impedance control coil itself, reducing the influence of horizontal deflection current. Furthermore, auxiliary cores 65a and 65b are added, and the magnetic fields 63a and 63b due to the saturation control coil are
By winding the coils in the direction indicated by Mvb, the magnetomotive forces of the saturation control coils 63a and 63b are added together, and a magnetic circuit with low magnetic resistance is formed between the saturable cores 61a and 63b.
61b and auxiliary cores 65a, 65b, the magnetic flux generated in the saturable cores 61a, 61b by the magnetomotive force of the saturation control coils 63a, 63b is maximized. Furthermore, since the magnetic flux is concentrated in a closed magnetic path, the maximum value Hvm of the magnetic field exerted by the saturable control coil on the saturable core has been greatly expanded compared to the conventional method.
Leakage magnetic flux is reduced. This reduction in magnetic flux leakage is achieved not only by concentration of magnetic flux in the closed magnetic circuit, but also in particular in the case of this embodiment, when the magnetic fields 63a and 63b due to the saturation control coil are
va and Mvb, the leakage magnetic fluxes are in opposite directions and canceled, which also works.

Furthermore, in this embodiment, the magnet 62
a and 62b are placed outside the magnetic circuit by being placed outside the auxiliary cores 65a and 65b. This is because when a magnet is placed inside a magnetic circuit, magnetic resistance is provided inside the circuit, the magnetic resistance of the magnetic circuit increases, and the magnetic flux generated by the saturation control coil decreases. Next, the correction effect of the cross misconvergence pattern in this embodiment will be explained.

In order to correct the cross-misconvergence patterns shown in FIGS. 9(a) and 9(b), the L-H characteristic as shown in FIG. It would be better to reduce it to the same level. At this time, the resistance of the saturation control coil becomes significantly smaller than in the past, but this does not pose a problem since the resistance of the saturation control coil is small.

Further, in order to correct the cross misconvergence pattern as shown in FIG. 9(c), it is sufficient to create the L-H characteristic as shown in FIG. 3. As shown in FIG. 3(a), by greatly expanding the saturable reactor operating range on the L-H curve compared to the conventional one, the inductances Lu and Ld of the impedance control coil are changed to curve 71,
As shown by 72, with respect to the increase in Hv, one is changed so that it decreases and then becomes constant, and the other is changed so that Hv < H
increases in the area of mag, maximum at Hv = Hmag, H
It is changed so that it decreases when v > Hmag. As a result, the difference between the inductances Lu and Ld is a certain Hv
It changes from an increasing direction to a decreasing direction after the value of . Especially H
If vm=Hmag+Hs, both inductances Lu and Ld become equal to Ls when Hv=Hvm, and the difference between inductances Lu and Ld rapidly decreases to zero. In this way, by expanding the saturable reactor operating region as Hvm = Hmag + Hs, curve 7 in Fig. 3(c)
5, it is possible to make the cross misconvergence correction amount at the upper and lower ends smaller than the correction amount at the upper and lower intermediate portions.

FIG. 3(a) is an example of the L-H characteristic in this embodiment. In the conventional example, as shown in FIG. 13(a), due to the above-mentioned problem, the maximum Hvm of the magnetic field exerted by the saturation control coil on the saturable core is Hvm< Hmag, and the correction amount was greater than the upper and lower ends. The present invention does not cause the above-mentioned conventional problems and achieves Hvm>H
By setting mag, as is clear from FIG. 3(c), the relationship between the correction amounts can be made such that the upper and lower ends ≦ the upper and lower intermediate parts.

Furthermore, as shown in FIGS. 4(a) to 4(d), by changing the design values of Hvm and Hmag, it is possible to variously change the characteristic curve shape of the cross misconvergence correction amount for the vertical deflection current Iv. can.

In the case of this embodiment, the magnetic field generation efficiency of the saturation control coil system is improved by approximately 3 to 10 times that of the conventional example by winding the saturation control coil close to the saturable core. By forming a structure in which the magnetomotive forces of the saturation control coils are mutually strengthened, Hvm is improved by about 2 to 6 times compared to the conventional one, and as a result, it is improved to about 6 to 60 times. This significantly reduces the resistance of the saturation control coil compared to conventional models and expands the operating range. For example, Fig. 9(c)
) is corrected in this embodiment, the number of turns of each saturation control coil is 80 with a winding of 0.38φ, and the resistance of the saturation control coil is only 0.37Ω. Since it is difficult to perform the correction shown in FIG. 9(c) using a conventional device, compared to the case where the cross misconvergence pattern shown in FIG. 9(b) is corrected instead, the correction of the conventional saturation control coil is Resistance is 1Ω~2Ω
That's about it.

That is, by adopting the above-mentioned configuration, cross misconvergence correction at the upper and lower ends can be performed without increasing the resistance of the saturation control coil, that is, without increasing the deflection power loss, while maintaining a compact structure compared to the conventional example. It is possible to realize a correction device that can correct various cross misconvergence patterns including a cross misconvergence pattern in which the amount of cross misconvergence correction is smaller than the cross misconvergence correction amount in the upper and lower intermediate portions. In addition,
Although the operating range can be expanded by increasing Hvm, it is necessary to set it appropriately taking into account the resistance of the saturation control coil.

(Embodiment 2) Next, another embodiment will be described with reference to FIG. In FIG. 5, the same numbers as in FIG. 1 indicate the same parts. Furthermore, the circuit diagram is similar to that shown in FIG.

FIG. 5 shows that the impedance control coils 64a, 64b, 64c, and 64d shown in FIG. It has been moved. In this case, the impedance control coil 64
Since the distance between the saturable cores 61a, 61b and the saturation control coils 63a, 63b at the positions where windings a, 64b, 64c, and 64d are wound is slightly increased compared to the embodiment shown in FIG. It increases slightly compared to the example.

(Embodiment 3) Next, still another embodiment will be described with reference to FIG. In FIG. 6, the same numbers as in FIG. 3 indicate the same parts. Furthermore, the circuit diagram is similar to that shown in FIG. FIG. 6 shows the saturable cores 61a, 61b and auxiliary coils 65a, 6 shown in FIG.
A ring-shaped saturable core 80 in which 5b is integrated is used.

In the above embodiment, the materials of the saturable cores 61a, 61b and the auxiliary cores 65a, 65b are not limited to those mentioned above. That is, in the first embodiment, the material of the auxiliary cores 65a and 65b is the saturable core 61a.
, 61b has higher saturation magnetic flux density to improve operating characteristics.
The auxiliary cores 65a and 65b may be made of the same material. In addition, in the second and third embodiments, the portions of the saturable cores 61a, 61b where the saturation control coils 63a, 63b are wound are replaced with the impedance control coils 64a, 64b.
By using a material with higher saturation magnetic flux density or a shape with higher saturation magnetic flux than the parts around which 4b, 64c, and 64d are wound, a decrease in magnetic permeability due to magnetic saturation in the magnetic circuit other than the saturable core, that is, an increase in magnetic resistance, can be prevented. can be suppressed to improve operating characteristics.

Further, in the above embodiment, the magnetic poles of the magnets 62a and 62b are oriented in the same direction, but they may be oriented in opposite directions. For example, in the case of the first embodiment, the impedance control coils 64a, 64b, 6 shown in FIG.
4c and 64d, the impedance control coils 64a and 64d are connected to the upper horizontal deflection coil of the pair of horizontal deflection coils, and the impedance control coil 6
By connecting 4b and 64c to the lower horizontal deflection coil of the pair of horizontal deflection coils, it is also possible to form a saturable core having the same effect as in the first embodiment.

Furthermore, the above embodiment has two saturable cores.
A saturation control coil and an impedance control coil are wound around each core, and the ends of these saturable cores are magnetically coupled with an auxiliary core to form a magnetic circuit. Alternatively, it is also possible to adopt a structure in which one saturation control coil having a magnetomotive force equal to the magnetomotive force of the two saturation control coils of the above-described embodiment and four impedance control coils are wound. However, in this case, since it is not preferable to increase the cross-sectional area of the saturation control coil, the structure of the saturable reactor becomes longer than in the above embodiment. In this way, the number of saturable cores is not limited to the above embodiments, and any structure that can form a magnetic circuit may be used.

Further, although it is preferable that the saturation control coil be wound close to the saturable core, the present invention is not limited to this, and it is also possible to wind the saturation control coil outside the impedance control coil.

Furthermore, even in saturable reactors with conventional configurations, there are those in which the saturation control coil and impedance control coil are separated and connected by a magnetic circuit using an auxiliary core, and in which a part of the core that is magnetized by the saturation control coil is separated. It is also possible to make it thinner to concentrate magnetic flux and facilitate saturation, and to use this part as a saturable core part.

[0048]

As described above, according to the present invention, by winding the saturation control coil around the saturable core and winding the impedance control coil adjacent to the saturation control coil,
In addition to increasing the strength of the magnetic field exerted by the saturable control coil on the saturable core, the ends of the saturable core are magnetically connected to form a magnetic circuit with low magnetic resistance, drawing maximum magnetic flux from the saturable control coil. This dramatically expands the operating range of the saturable reactor without increasing the resistance of the saturable control coil, increases the degree of freedom in designing the saturable reactor, and enables correction of various cross-misconvergence patterns. A picture tube device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of a saturable reactor in a color picture tube device of the present invention.

FIG. 2 is a circuit diagram of a saturable reactor in the color picture tube device of the present invention.

FIG. 3 is a characteristic diagram illustrating the effect of the present invention.

FIG. 4 is another characteristic diagram illustrating the effect of the present invention.

FIG. 5 is a diagram showing the configuration of another embodiment of the present invention.

FIG. 6 is a diagram showing the configuration of still another embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view showing the configuration of a color picture tube device.

8 is a schematic diagram showing the configuration of a deflection yoke of the color picture tube device shown in FIG. 7. FIG.

FIG. 9 is a schematic diagram showing a cross misconvergence pattern in a conventional color picture tube device.

FIG. 10 is a schematic diagram showing the configuration of a saturable reactor for correcting a cross-misconvergence pattern in a conventional color picture tube device.

FIG. 11 is a schematic diagram showing another configuration of a saturable reactor for correcting a cross-misconvergence pattern in a conventional color picture tube device.

FIG. 12 is a characteristic diagram for explaining the basic principle of a saturable reactor.

FIG. 13 is a characteristic diagram illustrating a cross misconvergence correction effect of a saturable reactor in a conventional color picture tube device.

FIG. 14 is a characteristic diagram illustrating another cross misconvergence correction effect of a saturable reactor in a conventional color picture tube device.

[Explanation of symbols]

7...Deflection yoke 11, 11a, 11b, 67a, 67b
...Horizontal deflection coil 12, 12a, 12b, 68a, 68b...Vertical deflection coil 60...Saturable reactor 20a, 20b, 20c, 20d, 61a, 61b, 8
0...Saturable core 23, 62a, 62b...Magnet 22, 63a, 63b...Saturation control coil 21a, 21b
, 21c, 21d, 64a, 64b, 64c, 64d...
Impedance control coils 65a, 65b...Auxiliary cores 66a, 66b...Insulation mold

Claims (1)

[Claims] 1. Each pair of horizontal and vertical deflection coils for deflecting a plurality of electron beams emitted from an electron gun is provided, and the current flowing through the pair of horizontal deflection coils is differentially varied in synchronization with the vertical deflection. In a color picture tube device comprising a saturable reactor that corrects misconvergence by changing the shape of a horizontal deflection magnetic field in synchronization with vertical deflection, the saturable reactor includes at least one saturable core; at least one saturation control coil wound around the saturable core through which a vertical deflection current flows; The structure includes at least one pair of impedance control coils connected to a horizontal deflection coil, and a magnet that applies a magnetic bias to the saturable core, and the end portions of the saturable core are magnetically coupled to each other, resulting in low magnetic resistance. A color picture tube device characterized by forming a magnetic circuit.