JPH0423690A - Deflector for color picture tube - Google Patents

Abstract

PURPOSE:To facilitate mis-convergence correction by varying the impedance of 2 sets of horizontal auxiliary coils connected respectively to a couple of horizontal deflection coils at a vertical deflection period by a vertical auxiliary coil connecting to a vertical deflection coil. CONSTITUTION:A differential coil 36 is used to correct a cross misconvergence 40a in the middle of the screen. Then the position of each core 31 is adjusted with respect to horizontal auxiliary coils 30a, 30b, 30c, 30d so that cross mis- convergence 40b(40c) at the circumference of the screen is corrected by using 2 sets of the four horizontal auxiliary coils 30a, 30b, 30c, 30d. For example, in order to correct the cross mis-convergence at the upper part of the screen, variable resistors 37a, 37b are used to increase the difference between impedance values LT, LB when the pattern is deviated to the upper part of the screen. Moreover, in order to correct the cross mis-convergence at the lower left part of the screen, the inserting quantity of each core 31 is adjusted to deflect an electron beam toward the lower left side of the screen and the impedance LT is increased and the Lb is decreased relatively more than the case with deflection of the beam toward the lower right of the screen.

Description

[Detailed description of the invention]

[Purpose of the invention] [0001]

[Industrial application field]

The present invention relates to a deflection device for a color picture tube, and in particular to a deflection device for a color picture tube that corrects convergence error between a pair of side beams of an in-line color picture tube by changing the circuit impedance of a horizontal deflection coil in a vertical deflection period. Relating to a deflection device. [0002]

[Conventional technology]

In general, a color picture tube, as shown in FIG. 9, directs three electron beams 2B, 2G, and 2R emitted from an electron gun 1 to each pair of horizontal and vertical deflection coils of a deflection yoke 3 mounted on the outside of an envelope. By horizontally and vertically scanning the phosphor screen 5 through a shadow mask 4 formed with a large number of electron beam passing holes, a color image is formed on the phosphor screen 5. It is formed into a structure that displays. [0003] In particular, for an in-line color picture tube that emits three electron beams 2B, 2G, and 2R arranged in a row consisting of a center beam and a pair of side beams passing on the same horizontal plane from an electron gun, the horizontal deflection magnetic field is converted into a binction type. By making the vertical deflection magnetic field a barrel-shaped non-uniform magnetic field, the three electron beams in the above-mentioned column arrangement can be generated by only the combination of the color picture tube and the deflection yoke without using any external circuit correction means. A self-convergence method has been realized in which the image is focused on itself and is substantially aligned over the entire screen. [0004] By the way, regarding this self-convergence type in-line color picture tube, there are three
Even if we adjust the winding distribution of the horizontal and vertical deflection coils and change the magnetic field distribution so that the electron beams are concentrated, it is difficult to concentrate the three electron beams at some corners of the screen, as shown in Figure 10. , a convergence error occurs between the convergence patterns 6B and 6R of the pair of side beams. The convergence error between the convergence patterns 6B and 6R of the pair of side beams is called a trilemma Tr, and the convergence error shown in the drawing is 3.
It is expressed by the following formula in which the elements Xh and YHlPQV are adjusted. [0005] "Equation 1" Tr = A case where 6R deviates is considered positive. [0006] In a normal color picture tube, the 39 elements Xh, YH, and PQV of the convergence error described above are combromized and put into practical use. However, when it comes to high-resolution tubes such as relatively large color picture tubes and color display tubes, the larger size and flat-faced panels make it difficult to achieve convergence over the entire screen. Due to finer definition, a maximum misconvergence of 0.3 mm or less is required, so the convergence error cannot be ignored. [0007] One way to solve this problem is to make Xh and YH zero with horizontal and vertical deflection coils, and correct cross-misconvergence PQV with a saturable reactor that changes the horizontal deflection magnetic field with the vertical deflection period. is being carried out. [0008] FIG. 11 shows the conventional saturable reactor. This saturable reactor consists of a set of two ferrite cores arranged in parallel, a permanent magnet 7 arranged at the end of the core, and two sets of four saturable cores 8a, 8b, which are magnetically biased.
8c, 8d, and each pair of saturable cores 8a, 8
Horizontal auxiliary coils 9a, 9b, 9c, and 9d are wound around and connected in series to coils b, 8c, and 8d, respectively.
and a vertical auxiliary coil 10 wound so that the magnetic flux spreads across the four saturable cores 8a, 8b, 8c, and 8d.
one set of horizontal auxiliary coils 9a,
9b is one coil 12a of a pair of horizontal deflection coils of the deflection yoke, and the other pair of horizontal auxiliary coils 9c
, 9d are connected in series to the other horizontal deflection coil 12b. Further, the vertical auxiliary coil 10 is connected in series to a pair of vertical deflection coils 13a and 13b. The vertical deflection current flowing through the vertical auxiliary coil 10 causes the vertical auxiliary coil 10 to generate a magnetic flux that changes with the vertical deflection period, and this magnetic flux changes the circuit impedance of one horizontal deflection coil 12a and the horizontal deflection of the other. The magnitude of the circuit impedance of the coil 12b is changed differentially. [0009] Therefore, using this saturable reactor, one
The amplitude of the current flowing through one set of horizontal deflection coils 12a and the amplitude of the current flowing through the other set of horizontal deflection coils 12b are modulated by the vertical deflection period, so that when the upper side has a barrel tendency, the lower side has a bink tension tendency. On the other hand, when the upper side has a tendency to bink, the lower side can generate a magnetic field distribution that has a barrel tendency, thereby correcting the cross misconvergence. [0010] Regarding such a saturable reactor, as shown by the broken line in FIG. 11, in parallel with the vertical side auxiliary coil 10,
A variable resistor 14a and a diode 15a connected in series,
A variable resistor 14b and a diode 15b are inserted, and the current flowing through the vertical auxiliary coil 10 is controlled by the variable resistors 14a and 14b, thereby adjusting the convergence correction amount and its vertical balance. There is. [0011] However, even if the cross-misconvergence is corrected using the saturable reactor as described above, in high-resolution tubes such as relatively large color picture tubes and color display tubes,
It is not possible to sufficiently correct the entire screen, and a convergence error remains. Therefore, for example, if the screen is divided into four parts along the horizontal and vertical axes, and there are variations in cross misconvergence components in each of the divided areas, it is necessary to correct it by installing a convergence collector such as a ferrite sheet or magnet. is being carried out. [0012] However, with such a correction means, when attempting to correct misconvergence in the vertical direction, for example, the convergence in the horizontal direction changes, and the cross misconvergence PQV
It is not possible to correct only the components. [0013]

Problems to be Solved by the Invention As mentioned above, self-convergence type in-line color picture tubes are originally designed to self-converge three electron beams over the entire screen. horizontally so that the three electron beams are concentrated at the
Even if the magnetic field distribution is changed by adjusting the winding distribution of the vertical deflection coil, it is difficult to concentrate the three electron beams at a part of the screen corner, and a convergence error occurs between the convergence patterns of the pair of side beams. In order to eliminate this convergence error, the three elements Xh, YH,
Of the PQV, Xh and YH are set to zero by the horizontal and vertical deflection coils of the deflection yoke, and the PQV is corrected using a saturable reactor that changes the horizontal deflection magnetic field with the vertical deflection period. [0014] However, even if a saturable reactor is used as described above, in a relatively large color picture tube or a high resolution tube such as a color display tube, sufficient correction cannot be made over the entire screen. Convergence error remains. therefore,
Correcting the convergence error by installing a convergence collector such as a ferrite sheet or a magnet, however, when such correction means attempt to correct the vertical misconvergence, the horizontal convergence changes and the cross Misconvergence component PQ
There is a problem that only V cannot be corrected. [0015] The present invention was made to solve the above problems, and provides a deflection device for a color picture tube that can easily correct complicated convergence errors in an in-line color picture tube and can obtain good convergence characteristics. The purpose is to configure. [0016] [Configuration of the invention] [0017]

[Means to solve the problem]

A deflection device for a color picture tube mounted on an in-line color picture tube that emits a plurality of beams arranged in a row passing on the same horizontal plane, comprising a pair of horizontal and vertical deflection coils for deflecting the plurality of beams in the horizontal and vertical directions. Regarding the deflection yoke, one set includes two coils that are connected in series to generate magnetic flux in opposite directions and separately connected in series to the pair of horizontal deflection coils to generate magnetic flux that changes with the horizontal deflection period. two sets of four horizontal auxiliary coils, two sets of four magnetically biased saturable cores that control the magnetic flux density of each horizontal auxiliary coil, means for changing the impedance of each of the horizontal auxiliary coils, and the above. A saturable reactor was provided, which had a vertical auxiliary coil connected to the vertical deflection coil and generating a magnetic flux varying with the vertical deflection period in the two sets of four saturable cores. [0018] More specifically, the means for changing the impedance of the two sets of four horizontal auxiliary coils includes two sets of four horizontal auxiliary coils arranged such that their positions can be adjusted independently with respect to each horizontal auxiliary coil. It consists of a saturable core. [0019] Furthermore, the means for changing the impedance of the two sets of four horizontal auxiliary coils includes variable resistors that are individually connected in series to a pair of horizontal deflection coils and are individually connected in parallel to each set of horizontal auxiliary coils. The variable resistance movable contact is constituted by a resistance circuit connected to the connection point of each set of horizontal auxiliary coils. [00201

[Function] As described above, a saturable reactor is provided for the deflection yoke, and the saturable reactors are connected in series to generate magnetic flux in opposite directions, and to generate magnetic flux that changes with the horizontal deflection period. Two sets of horizontal auxiliary coils each consisting of two coils connected in series to a pair of horizontal deflection coils, and a magnetic field that controls the inductance of each horizontal auxiliary coil that changes with the horizontal deflection period. 2 sets of 4 biased saturable cores, a means for changing the impedance of each of the horizontal auxiliary coils, and a means connected to the vertical deflection coil to change the impedance of the 2 sets of 4 saturable cores at the vertical deflection period. and a vertical auxiliary coil that generates a magnetic flux to
By changing the impedance of the pair of horizontal auxiliary coils in the vertical deflection period by the vertical auxiliary coil connected to the vertical deflection coil, a difference is created in the current flowing through the pair of horizontal deflection coils, and the resulting horizontal deflection magnetic field Misconvergence can be corrected by changing the distribution. Furthermore, by changing the impedance of the two sets of horizontal auxiliary coils, the magnetic field distribution can be changed appropriately even during the horizontal deflection period, and the convergence error of the complex in-line color picture tube can be well corrected. can. [0021] In particular, the means for changing the impedance of the horizontal auxiliary coils may be two sets of four saturable cores arranged such that their positions can be adjusted independently with respect to two sets of four horizontal auxiliary coils, or a pair of saturable cores. Variable resistors are connected in series to each horizontal deflection coil and parallel to each set of horizontal auxiliary coils, and the movable contacts of the variable resistors are connected to the connection points of each set of horizontal auxiliary coils. When configured as a circuit, the impedance of the two sets of horizontal auxiliary coils can be effectively and appropriately changed. [0022] Embodiments The present invention will be described below based on embodiments with reference to the drawings. [0023] FIG. 1 shows the structure of an in-line color picture tube deflection device, which is an embodiment thereof, and FIG. 2 shows its circuit configuration. This deflection device is attached to the outside of the envelope of an in-line color picture tube, and consists of a center beam and a pair of side beams that are emitted from the electron gun of this color picture tube and are arranged in a line. It is composed of a deflection yoke 20 that deflects the light, and a saturable reactor 21 attached to the deflection yoke 20. [0024] The deflection yoke 20 is a saddle-saddle type deflection yoke, and is arranged inside a mold 23 having a hollow cylindrical shape,
a pair of upper and lower saddle-type horizontal deflection coils 24a that generate a horizontal deflection magnetic field that deflects the three electron beams in the horizontal direction;
24b, and the above-mentioned 3
A pair of left and right saddle-type vertical deflection coils 25a and 25b that generate a vertical deflection magnetic field that deflects the electron beam in the vertical direction.
and the pair of left and right saddle-type vertical deflection coils 25a,
25b and a cylindrical ferrite core 26 disposed on the outside so as to cover the ferrite core 25b. [0025] As shown in FIG. 3, the saturable reactor 21 includes a pair of coils each wound around a resin bobbin 29 as one set of coils, and two sets of four horizontal auxiliary coils arranged in parallel. 30a, 30b, 30c, 30d, and its horizontal side auxiliary coils 30a, 30b, 30c, 3
A core 3 is placed inside each bobbin 29 wound with 0d.
1 is inserted. Each core 31 corresponds to each resin bobbin 2.
It is screwed together with the collar 32 attached to the outer end of the horizontal side auxiliary coils 30a, 30b, 30c, and 30d, and the insertion amount can be adjusted by adjusting the position in the winding direction of each of the horizontal auxiliary coils 30a, 30b, 30c, and 30d. ing. In addition, each horizontal side auxiliary coil 30a
, 30b, 30c, and 30d have permanent magnets 3 at their inner ends that magnetically bias the core 31 to make it a saturable core.
3 is placed. Further, two sets of four horizontal auxiliary coils 30a, 30b, 30c arranged in parallel,
A vertical auxiliary coil 34 is disposed in the middle of the coil 30d via a permanent magnet 33 disposed at its inner end, and these are assembled into an integral coil unit. [0026] This saturable reactor 21 has a substrate 3 as shown in FIG.
5 and disposed on the core 26 of the deflection yoke 20. As shown in FIG. 2, two sets of four horizontal auxiliary coils 30a, 30b, 30c, 30d
(7) One set of horizontal auxiliary coils 30a,
30b is connected in series to the upper horizontal deflection coil 24a of the deflection yoke, and coils 30a and 30b are connected in series so as to generate magnetic fluxes in opposite directions. In addition, the other pair of horizontal auxiliary coils 30c and 30d are as follows:
It is connected in series to the lower horizontal deflection coil 24b of the deflection yoke, and the potash coils 30c and 30d are similarly connected in series so as to generate magnetic fluxes in opposite directions. In addition, these two sets of horizontal side auxiliary coils 30a, 30b, 30c
. A differential coil 36 whose impedance differentially changes depending on the position of the core inserted inside is connected to 30d. Further, the vertical auxiliary coil 34 is connected in series to a pair of left and right vertical deflection coils 25a and 25b of the deflection yoke. Furthermore, this saturable reactor 21
Now, the variable resistor 37a and the diode 3 connected in series
8a, a variable resistor 37b, and a diode 38b are connected in parallel with the vertical auxiliary coil 34. [0027] In such a saturable reactor 21, the vertical deflection current flowing through the vertical auxiliary coil 34 generates a magnetic flux in the vertical auxiliary coil 34 that changes with the vertical deflection period, and this magnetic flux causes the upper part of the deflection yoke to The circuit impedance of the horizontal deflection coil 24a and the circuit impedance of the lower horizontal deflection coil 24b are differentially changed, thereby changing the amplitude of the current flowing through the upper horizontal deflection coil 24a and the amplitude of the current flowing through the lower horizontal deflection coil 24b. It is possible to generate a magnetic field with a distribution such that when the upper part has a barrel tendency, the lower part has a bink tension tendency, and conversely, when the upper part has a bink tension tendency, the lower part has a barrel tendency. Moreover, the magnetic field distribution can be changed by adjusting the position of each core 31 with respect to each of the horizontal auxiliary coils 30a, 30b, 30c, and 30d and adjusting the amount of insertion thereof. [00283] Next, correction of cross misconvergence in a color picture tube using this deflection device will be explained. [0029] Due to assembly errors of the color picture tube and the deflection yoke 20, as shown in FIG. Let's talk about cases where this is not possible. First, the cross misconvergence 40a at the center of the screen is corrected by the differential coil (36). Next, set the cross misconvergence 40b and 40c at the periphery of the screen to 4.
2 sets of horizontal side auxiliary coils 30a, 30b, 30c
, 30d, the position of each core 31 is adjusted with respect to each horizontal auxiliary coil 30a, 30b, 30c, 30d. [00301 That is, as shown by the straight line 42 in FIG. 6(a), in a normal deflection yoke without a saturable reactor, the circuit impedance LT of the upper horizontal deflection coil and the circuit impedance LB of the lower horizontal deflection coil are constant. However, in a deflection device equipped with a saturable reactor, the circuit impedance LT of the upper horizontal deflection coil and the circuit impedance LB of the lower horizontal deflection coil have the same curve (b). 43a and 43b. [0031] Therefore, in order to obtain a magnetic field shape as shown by the arrow 44 in FIG. 5, the circuit impedances LT and LB of the pair of upper and lower horizontal deflection coils are adjusted as follows. [0032] First, in order to correct the cross misconvergence at the center of the screen, the differential coil 36 creates a curve 44 in FIG. 6(C).
As shown in a and 44b, when IV = 00, LT
>Make it LB. Next, in order to correct cross misconvergence at the periphery, for example at the top of the screen, a variable resistor 37a,
37b, the difference between LT and LB when deflected toward the top of the screen is increased, as shown by broken lines 45a and 45b in FIG. 37(d). Furthermore, in order to correct the cross misconvergence at the bottom left of the screen, the position (insertion amount) of each core 31 is
As shown by curves 46a and 46b (solid lines) in (e), when the electron beam is deflected to the lower left of the screen, LT is relatively larger than when it is deflected to the lower right of the screen. Conversely, shorten LB by /JX. [0033] When deflecting the electron beam to each position on the screen in this way,
By appropriately adjusting the circuit impedance LT of the upper horizontal deflection coil 24a and the circuit impedance LB of the lower horizontal deflection coil 24b of the deflection yoke, the convergence error between the convergence patterns of the pair of side beams shown in FIG. It is possible to appropriately correct the entire area. [0034] Next, other embodiments will be described. [0035] In the above embodiment, as a means for changing the impedance of the two sets of four horizontal auxiliary coils, the core 31 is arranged so as to be adjustable in position relative to each horizontal auxiliary coil.
The means for changing the impedance of the two sets of four horizontal auxiliary coils can be constructed as shown in FIGS. 7 and 8. [0036] That is, in the deflection device of this example, two sets of four horizontal auxiliary coils 30a, 30b, 30c, 30d
One set of horizontal auxiliary coils 30a is connected in series to the upper horizontal deflection coil 24a of the deflection yoke 20;
30b and the other horizontal auxiliary coils 30c and 30d connected in series to the lower horizontal deflection coil 24b are connected in series so as to generate magnetic fluxes in opposite directions, respectively. And these horizontal side auxiliary coils 30a, 3
For 0b, 30c, 30d, variable resistor 48a
Resistors 49a and 49b are connected in series with the resistors 49a and 49b in the center, and the movable contact of the variable resistor 48a is connected to the middle of one set of horizontal auxiliary coils 30a and 30b. horizontal side auxiliary coil 30a
, 30b, and similarly, resistors 49a and 49b are connected in series with variable resistor 48b in the center, and the movable contact of variable resistor 48b is connected between the other pair of horizontal auxiliary coils 30c and 30d. The connected resistance circuit 50b is the other horizontal auxiliary coil 30c, 30d.
are connected in parallel. These resistance circuits 50a, 50
b denotes two sets of four horizontal auxiliary coils 3 of the deflection device in this example.
This is a means for changing the impedance of 0a, 30b, 30c, and 30d. Therefore, in the deflection device of this example, the core 31 is fixed. [0037] Note that the other configurations are the same as those in the embodiment described above, so the same numbers are given to the same parts and the explanation thereof will be omitted. [0038] In this deflection device, the vertical deflection current flowing through the vertical auxiliary coil 34 generates a magnetic flux in the vertical auxiliary coil 34 that changes with the vertical deflection period, and this magnetic flux causes
The circuit impedance of the upper horizontal deflection coil 24a and the lower horizontal deflection coil 24b of the deflection yoke are differentially changed, thereby changing the amplitude of the current flowing through the upper horizontal deflection coil 24a and the lower horizontal deflection coil 2.
Modulating the amplitude of the current flowing through 4b with the vertical deflection period,
When the upper part has a barrel tendency, the lower part has a binding tendency, and conversely, when the upper part has a binding tendency,
A magnetic field with a barrel-like distribution at the bottom is generated, and the magnetic field distribution is applied to each of the horizontal auxiliary coils 30a, 30b, 30.
The horizontal deflection period can also be changed by adjusting the variable resistors 48a and 48b with respect to the angles c and 30d. [0039] Therefore, regarding the correction of cross misconvergence, due to assembly errors of the color picture tube and the deflection yoke (20), as shown in FIG. Crosssmith convergence 40b. 40c cannot be completely corrected by the differential coil 36. First, the differential coil 36 corrects the cross misconvergence 40a at the center of the screen. Next, cross misconvergence 40b at the periphery of the screen,
2 sets of 4 40c horizontal side auxiliary coils 30a, 30
The horizontal auxiliary coils 30a, 30b, 30c can be corrected by the horizontal auxiliary coils 30a, 30b, 30d. This is done by adjusting variable resistors 48a and 48b with respect to 30d. [0040] That is, in the above embodiment, in order to obtain the magnetic field shape as shown by the arrow 44 in FIG. 5, the circuit inductance LT of the pair of upper and lower horizontal deflection coils is changed by the differential coil as shown in FIG. 6(C). When LB is IV = 0, LT > LB
After correcting the cross misconvergence in the center of the screen, as shown in (d) using a variable resistor,
In order to correct cross-misconvergence at the top of the screen by increasing the difference between LT and LB when deflected toward the top of the screen, and to further correct cross-misconvergence at the bottom left of the screen, the position of each core is adjusted and the same ( As shown in e),
When deflecting the electron beam to the bottom left of the screen, LT is relatively large, and LB is relatively large, compared to when deflecting the electron beam to the bottom right of the screen.
However, in the deflection device of this example, when correcting the cross misconvergence at the bottom left of the screen, variable resistors (48a), (48) are used instead of adjusting the core position.
b), the curves 46a and 4 shown in FIG. 6(e) are obtained.
This is done by relatively increasing LT and conversely decreasing LB as in 6b. [0041] Therefore, even if the deflection device is configured as described above, when the electron beam is deflected to each position on the screen, the circuit impedance T of the upper horizontal deflection coil 24a of the deflection yoke and the circuit impedance of the lower horizontal deflection coil 24b are Circuit impedance LB
By appropriately adjusting this, the convergence error between the convergence patterns of the pair of side beams shown in FIG. 4 can be appropriately corrected over the entire screen. [0042]

【Effect of the invention】

The deflection yokes each have a pair of horizontal and vertical deflection coils for horizontally and vertically deflecting a plurality of beams arranged in a row passing on the same horizontal plane of an in-line color picture tube, and are connected in series to generate magnetic fluxes in opposite directions. and 2 sets of 4 horizontal auxiliary coils each connected in series to a pair of horizontal deflection coils to generate a magnetic flux that changes with the horizontal deflection period, and 4 magnetically biased auxiliary coils that control the inductance of the horizontal auxiliary coils. 2 sets of saturable cores, a means for changing the impedance of each of the horizontal auxiliary coils, and a vertical side that is connected to the vertical deflection coil and generates a magnetic flux that changes the 2 sets of 4 saturable cores at the vertical deflection period. When a saturable reactor having an auxiliary coil is provided, the impedance of the two horizontal auxiliary coils of the saturable reactor is changed in the vertical deflection period by the vertical auxiliary coil connected to the vertical deflection coil. A difference occurs in the current flowing through the deflection coil, and as a result, the distribution of the horizontal deflection magnetic field is changed, thereby making it possible to correct misconvergence. Furthermore, by changing the impedance of the two sets of horizontal auxiliary coils, it is possible to appropriately change the magnetic field distribution even during the horizontal deflection period, increasing the degree of freedom in correcting the misconvergence component caused by the saturable reactor, and achieving good convergence. A deflection device for color picture tubes having these characteristics can be obtained. [0043] In particular, the means for changing the impedance of the horizontal auxiliary coils is a saturable core arranged so that the position can be adjusted independently with respect to two sets of four horizontal auxiliary coils, or a resistance circuit having parallel variable resistances. With this structure, the impedance of the two sets of horizontal auxiliary coils can be effectively and appropriately changed, and a deflection device for a color picture tube having good convergence characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of an in-line color picture tube deflection device according to an embodiment of the present invention.

[Figure 2] FIG. 2 is a circuit configuration diagram thereof.

[Figure 3] It is a figure showing the structure of the saturable reactor.

FIG. 4 is a diagram showing a convergence shift on the screen of a color picture tube.

FIG. 5 is a diagram of a magnetic field distribution for correcting the convergence shift.

FIG. 6 is a characteristic curve diagram showing the relationship between circuit impedances of a pair of upper and lower horizontal deflection coils of the deflection yoke; FIG. 6(a) is a characteristic curve diagram of a normal deflection yoke without a saturable reactor;
Fig. 6(b) is a characteristic curve diagram of a deflection device equipped with a saturable reactor for obtaining the magnetic field shape at the periphery of the screen shown in Fig. 5, and Fig. 6(C) is a characteristic curve diagram for obtaining the magnetic field shape at the center of the screen. FIG. 6(d) is a characteristic curve diagram of a deflection device equipped with a saturable reactor, and FIG. 6(d) is a characteristic curve diagram of a deflection device equipped with a saturable reactor to balance the magnetic field shape at the top of the screen. FIG. 6(e) is a characteristic curve diagram of a deflection device equipped with a saturable reactor for obtaining the magnetic field shape shown in the lower left of the screen.

FIG. 7 is a perspective view showing the structure of an in-line color picture tube deflection device according to another embodiment.

[Figure 8] FIG. 2 is a circuit configuration diagram thereof.

[Figure 9] FIG. 2 is a cross-sectional view showing the configuration of a color picture tube.

FIG. 10 is a diagram showing a convergence pattern of a pair of side beams of an in-line color picture tube.

FIG. 11 is a diagram showing a circuit configuration of a conventional in-line color picture tube deflection device.

[Description of symbols] 20...Deflection yoke 21...Saturable reactor 24a, 24b...A pair of saddle-shaped horizontal deflection coils 25a, 25b...A pair of saddle-shaped vertical deflection coils 26...Core 30a , 30b, 30c, 30d - Horizontal auxiliary coil 31 Core 33 Permanent magnet 34 Vertical auxiliary coil 36 Differential coil 37a, 37b Variable resistor 38a, 38b --- Diode 48a 48b --- Variable resistor 49a, 49b --- Resistor 50a 50b --- Resistor circuit

【Document name】

[Figure 2] drawing

[Figure 3]

[Figure 4]

[Figure 5] Y

[Figure 7]

[Figure 8]

[Figure 91 [Figure 10]

[Figure 11]

Claims (3)

[Claims] 1. A deflection yoke having a pair of horizontal deflection coils for horizontally deflecting a plurality of beams arranged in a row passing on the same horizontal plane of a color picture tube, and a pair of vertical deflection coils for deflecting the plurality of beams in a vertical direction. , four coils, each consisting of two coils connected in series to generate magnetic flux in opposite directions and separately connected in series to the pair of horizontal deflection coils to generate magnetic flux that changes with the horizontal deflection period. two sets of horizontal auxiliary coils, two sets of four magnetically biased saturable cores that control the inductance of the horizontal auxiliary coils, means for changing the impedance of each of the horizontal auxiliary coils, and connection to the vertical deflection coil. and above 4
1. A deflection device for a color picture tube, comprising: a saturable reactor having two sets of saturable cores and a vertical auxiliary coil that generates a magnetic flux that changes with a vertical deflection period. 2. Means for changing the impedance of the two sets of four horizontal auxiliary coils comprises two sets of four saturable cores arranged so as to be able to adjust their positions independently with respect to each of the horizontal auxiliary coils. A deflection device for a color picture tube according to claim 1, characterized in that: 3. A means for changing the impedance of two sets of four horizontal auxiliary coils, each having a variable resistor connected in series to each pair of horizontal deflection coils and parallel to each set of horizontal auxiliary coils; 2. The deflection device for a color picture tube according to claim 1, wherein the variable resistance movable contact comprises a resistance circuit connected to a connection point of each set of horizontal auxiliary coils.