JPH05347132A - Deflection yoke and color cathode-ray tube device constituted of it - Google Patents

Abstract

PURPOSE:To obtain a color cathode-ray tube which may be realized with a small loss and a small amount of correction for convergence in accordance with a temperature as for the generation of magnetic field for an effective auxiliary deflection to correct a pincushion distortion and a coma--aberration and the correction of a bowed misconvergence between the vertical lines of a screen due to a both-terminal electron beam. CONSTITUTION:A horizontal deflection coil 2 and a variable inductance 11 are connected to a horizontal deflection circuit(HDC) and coils 2 are balanced by the variable inductance 11. A vertical deflection coil 3, auxiliary vertical deflection coils 7a to 7f, resistors 22d, 22e and a resistor circuit of a thermistor 24 are interconnected in series with one another and then connected to a vertical deflection circuit(VDC) to perform the balance control of a current flowing through the coil 3. The temperature coefficient of resistance of a resistor circuit including resistors 22e, 22d and a thermistor 24 is set to a negative value. The bypass resistor of a series circuit of diode 12b, a resistor 22c and a variable resistor 23c is connected in parallel on both sides of a series circuit of lower side coils 7e, 7f, a resistor circuit 22d, 22e and a thermistor 24. With this arrangement, when the forward voltage of a diode is lowered due to temperature increase, the resistance of a resistor circuit is lowered, so that the corrective effect of a bowed convergence becomes constant and also the loss of a resistor circuit becomes small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke which is used by being attached to a color cathode ray tube which generates an in-line array of multiple electron beams and which has a horizontal deflection coil and a vertical deflection coil wound around a main magnetic core. More specifically, the present invention relates to a deflection cathode provided with a sub magnetic core around which an auxiliary vertical deflection coil is wound as a convergence adjusting means, and a color cathode ray tube device including the deflection yoke.

[0002]

2. Description of the Related Art As a first conventional device relating to a deflection yoke provided with a convergence adjusting means, a full-fledged Sho 62-
As described in Japanese Patent No. 153759, a convergence coil is connected to a vertical deflection coil through a diode bridge circuit, and a quadrupole magnetic field is generated by the convergence coil, thereby generating electrons at both ends of a multi-electron beam in an in-line arrangement. Display screen by beam (hereinafter,
It was to correct the bow-shaped misconvergence between the vertical lines displayed on the screen.

Further, as a second conventional device, a television conference technical report VOL. 16, NO. 2, IDY92
As described in -18, a circuit in which two sets of auxiliary vertical deflection coils are connected in parallel is connected in series to the vertical deflection coil, and a magnetic field is generated by the auxiliary vertical deflection coil,
This was to correct the arc-shaped misconvergence between the vertical lines displayed on the screen by the electron beams at both ends of the multiple electron beams in the in-line arrangement.

[0004]

In the first prior art described above, the bow-shaped misconvergence between the vertical lines projected on the screen by the electron beams at both ends can be corrected, but the auxiliary vertical contribution that contributes to the correction of pincushion distortion and coma aberration can be achieved. It did not generate a deflection field. Further, in order for current to flow from the vertical deflection coil to the convergence coil, a bias voltage equal to or higher than the forward voltage of the two diodes in the diode bridge circuit is required. In order to obtain this bias voltage, it is necessary to connect a resistor having a large resistance value in series with the vertical deflection coil, which causes a problem of increased loss.

Further, in the above-mentioned second conventional technique, since a parallel circuit composed of a resistor and a diode is connected in series to each of the two sets of auxiliary vertical deflection coils, the surroundings are required when performing the convergence correction. when the internal temperature of the temperature or the device is increased, with increasing temperature, by the forward voltage V _F of the diode is reduced, has not been taken into account for that amount of correction of the convergence is changed ..

According to the present invention, generation of an auxiliary vertical deflection magnetic field that contributes to correction of pincushion distortion and coma aberration, and correction of arcuate misconvergence between vertical lines projected on the screen by electron beams at both ends are reduced and loss is reduced. It is an object of the present invention to provide a deflection yoke that can be realized under the condition that a change in convergence correction amount with respect to a temperature change is small, and a color cathode ray tube device that constitutes the deflection yoke.

[0007]

In order to achieve the above object, in a deflection yoke according to the present invention, a sub yoke is formed on a side of an electron gun of a deflection yoke composed of a main magnetic core around which a horizontal deflection coil and a vertical deflection coil are wound. A magnetic core is disposed, at least a first set of auxiliary vertical deflection coils and a second set of auxiliary vertical deflection coils are provided in the sub-magnetic core, and the first and second sets of auxiliary vertical deflection coils are provided in the vertical direction. A resistance circuit connected to the deflection coil and having a resistance value with a negative temperature coefficient,
A shunt circuit connected in series to the first and second sets of auxiliary vertical deflection coils and including at least a diode in parallel with the resistance circuit and of the first and second sets of auxiliary vertical deflection coils; Each is connected in parallel or in series.

[0008]

The first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils each have a vertical magnetic field component on a horizontal central axis that coincides with the axis where the multiple electron beams are arranged. And the horizontal magnetic field components are generated so that the respective directions are the same.

By the action of the resistance circuit and the shunt circuit, the vertical deflection current of the first polarity corresponding to the case of deflecting the upper half surface of the screen flows through the auxiliary vertical deflection coil of the first set. The current is lower than the current flowing in the second set of auxiliary vertical deflection coils. As a result, the magnetic field generated by both the first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils is such that the vertical magnetic field coincides with the orientation generated by only the second set of auxiliary vertical deflection coils. Generate ingredients.

On the other hand, with respect to the vertical deflection current having the opposite polarity to the first polarity corresponding to the case of deflecting the lower half surface of the screen, the current flowing through the auxiliary vertical deflection coils of the second set is the first set. It is less than the current flowing in the auxiliary vertical deflection coil of. As a result, the magnetic fields generated by both the first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils are
Generates a vertical magnetic field component that matches the orientation generated by only the set of auxiliary vertical deflection coils.

Considering the polarity of the current, the magnetic field generated on the horizontal central axis by both the first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils deflects the upper half surface of the screen. Since the case and the case of deflecting the lower half surface are the same, the arcuate misconvergence between the vertical lines displayed on the screen by the electron beams at both ends can be corrected.

Further, the auxiliary vertical deflection magnetic field is generated by synthesizing horizontal magnetic field components having the same direction on the horizontal central axis generated by each of the first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils. Has the effect of forming. Therefore, pincushion distortion and coma can be changed by the effect of the auxiliary vertical deflection magnetic field.

Furthermore, with respect to the change in the forward voltage of the diode forming the shunt circuit with the temperature, a change in the equivalent voltage drop with the temperature can be generated in the resistance circuit. The correction of the arcuate misconvergence between the vertical lines displayed on the screen by the beam can be kept constant.

Furthermore, the resistance value of the resistance circuit connected in series with the auxiliary vertical deflection coil can be made as small as possible to obtain the bias voltage required for the shunt circuit to conduct, so that the loss of the circuit is reduced. be able to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing a side surface of a deflection yoke as a first embodiment of the present invention, and FIG. 2 is a rear view showing a rear surface of the deflection yoke of FIG.

In each of the above figures, 1 is a deflection yoke, 2 is a horizontal deflection coil, 3 is a vertical deflection coil, 4 is a main magnetic core made of a magnetic material, 5 is a separator made of an insulator, and 6 is a magnetic material. A ring-shaped sub magnetic core having radial projections 6a to 6h, and vertical deflection coils 3a to 7f.
An auxiliary vertical deflection coil (7a to 7f are collectively referred to as an auxiliary vertical deflection coil 7), 8 is an electron gun side, 9 is a static convergence magnet, 10 is a color cathode ray tube, and 21 is an electron gun. , 19 are fluorescent screens.

In this embodiment, the horizontal deflection coil 2 and the vertical deflection coil 3 are both saddle-shaped. Further, a main magnetic core 4 made of a magnetic material is arranged around the outer circumferences of the deflection coils 2 and 3. A sub magnetic core 6 is arranged on the electron gun side 8 of the deflection yoke 1, and radial projections 6a, 6b, 6c, 6d on the horizontal axis 25 and the diagonal axes 26a, 26b of the sub magnetic core 6 are arranged. , 6e, 6f include auxiliary vertical deflection coils 7a, 7b, 7c, 7 described above.
The auxiliary vertical deflection coil 7 is formed by winding d, 7e, and 7f.

Next, FIG. 3 is a connection diagram showing a connection state in the deflection yoke of FIG. In FIG. 3, the horizontal deflection coil 2 and the variable inductor 11 are connected to each other and connected to the horizontal deflection circuit HDC. Here, the variable inductor 11 is a unit normally provided for adjusting the balance of the currents flowing in the horizontal deflection coil 2.

Further, the vertical deflection coil 3, the auxiliary vertical deflection coil 7 (7a to 7f), and the resistance circuit composed of the resistors 22d and 22e and the thermistor 24 are connected in series to each other to form the vertical deflection circuit VDC. The vertical deflection circuit VDC is connected and the vertical deflection current Iv is supplied from the vertical deflection circuit VDC. A resistor 22a and a variable resistor 23a are connected to the vertical deflection coil 3 so that the balance of the current flowing through the vertical deflection coil 3 can be adjusted.

Further, the radial protrusions 6a to 6 of the sub magnetic core 6 are provided.
Horizontal axis 25 of auxiliary vertical deflection coils (7c, 7f: 7d, 7e) located on diagonal axes 26a, 26b in f
At both ends of the series circuit of the upper coils 7c and 7d located on the upper side with respect to the resistance circuit (22d, 22e, 24), a diode 12a, a resistor 22b and a variable resistor for blocking the current in the first direction are provided. The first shunt circuit composed of the series circuit of the device 23b is connected in parallel.

Further, the lower coils 7e and 7f located below the horizontal axis 25 and the resistance circuits (22d and 22d).
e, 24), a diode 12b and a resistor 22 for blocking a current in the direction opposite to the first direction are provided at both ends of the series circuit.
A second shunt circuit composed of a series circuit of c and the variable resistor 23c is connected in parallel.

FIG. 4 is a sectional view showing a section of the auxiliary vertical deflection coil in the deflection yoke of FIG. It is assumed that the direction in which the vertical deflection current Iv flows during deflection on the upper half surface of the screen is the direction indicated by the arrow Y1 in FIG. 3, and conversely, the direction in which the vertical deflection current Iv flows during deflection on the lower half surface of the screen is Figure 3
4A shows a magnetic field 13a generated by the auxiliary vertical deflection coil 7 (7a to 7f) of this embodiment when the upper half surface of the screen is deflected. 4 (b) shows the magnetic field 13b generated by the auxiliary vertical deflection coil 7 (7a-7f) of this embodiment when the lower half surface of the screen is deflected.

In the case of FIG. 4A, since the vertical deflection current Iv flows in the direction of the arrow Y1 in FIG. 3 when the upper half surface of the screen is deflected, conduction of the diode 12a shown in FIG. The vertical deflection currents flowing in 7c and 7d are shunted and reduced, and the magnetic fields generated by the upper coils 7c and 7d are lower coils 7e and 7 which do not shunt the vertical deflection current.
It is weaker than the magnetic field generated by f, and the magnetic field 13 near the horizontal axis
a has a shape that is convexly curved upward. As a result, the central electron beam 14G receives a large deflection force 15 on the upper side, and the electron beams 14R, 14B on both ends receive a deflection force 15 that is a combination of a slightly smaller force and a horizontal force.

In the case of FIG. 4B, when the lower half surface of the screen is deflected, the vertical deflection current Iv is indicated by an arrow Y in FIG.
Since it flows in two directions, the diode 12b shown in FIG.
The vertical deflection currents flowing through the lower coils 7e and 7f are shunted and reduced due to the conduction of the above, and the magnetic field generated by the lower coils 7e and 7f is increased by the upper coil 7 that does not cause shunting of the vertical deflection current.
The magnetic field 13b, which is weaker than the magnetic fields generated by c and 7d and near the horizontal axis, has a downwardly curved shape. As a result,
The central electron beam 14G receives a large deflection force 15 below,
Both ends of the electron beams 14R and 14B receive a deflection force 15 which is a combination of a slightly small force and a horizontal force.

5 (a), 5 (b) and 5 (c) show misconvergence patterns on the screen which can be corrected by this embodiment, and FIG. 5 (a) shows the electron beam 14R on both ends having the arrangement shown in FIG. , 17B vertical lines 17R, 17B
It shows the misconvergence between them, and is generally called arcuate misconvergence. Further, FIG. 5B shows the pincushion distortion of the horizontal line raster. FIG. 5C shows the electron beam 14 at both ends.
It shows the misconvergence between the horizontal line rasters 18R and 18B caused by R and 14B and the horizontal line raster 18G caused by the central electron beam 14G having the arrangement shown in FIG. 4, and is generally called coma aberration.

The magnetic field 13a when deflecting the upper half surface of the screen shown in FIG. 4A is the magnetic field 13c shown in FIGS. 6A and 6B.
This corresponds to a combination of 13d. The magnetic field 13c is a normal auxiliary vertical deflection magnetic field, and includes a uniform magnetic field component 13e shown in FIG. 6C and a 6-pole non-uniform magnetic field component 13 shown in FIG. 6D.
It corresponds to a composite of f.

As is conventionally known, the pincushion distortion shown in FIG. 5 (b) can be corrected by the uniform magnetic field component 13e, and FIG. 5 (c) by the 6-pole non-uniform magnetic field component 13f.
The coma aberration shown in can be corrected. In addition, FIG.
The quadrupole magnetic field 13d shown in (b) has a function of correcting the arcuate misconvergence shown in FIG. 5 (a).

In FIG. 3, the resistor 22 described above is used.
The resistance circuit composed of d, 22e and the thermistor 24 is for generating a potential difference necessary for turning on (turning on) the diode 12a or 12b. Here, the temperature coefficient of the resistance value of this resistance circuit (22d, 22e, 24) is negative. Therefore, even if the temperature rises and the forward voltage V _F of the diode 12a or 12b decreases as the temperature rises, the resistance value of the resistance circuit (22d, 22e, 24) increases as the temperature rises. Since it also decreases, the effect of correcting the arcuate misconvergence can be kept constant.

The resistance circuits (22d, 22e, 2)
In 4), the resistance value can be set to a small value because it is sufficient to generate only the potential difference required for one diode of each of the diodes 12a and 12b connected in parallel to conduct (turn on). Therefore, the circuit loss can be reduced.

On the other hand, the resistors 22b and 22c and the variable resistors 23b and 23c are for determining the correction amount of the arcuate misconvergence shown in FIG. 5A. The smaller the resistance value, the larger the correction amount. Become. Therefore, the variable resistors 23b and 23c can independently adjust the arcuate misconvergence of the upper half of the screen and the lower half of the screen, and the bow having different values on the upper half of the screen and the lower half of the screen as shown in FIG. 5D. It is possible to correct the misconvergence.

FIG. 7 is a rear view showing a rear surface of a deflection yoke as a second embodiment of the present invention, FIG. 8 is a sectional view showing a cross section of a main part of the deflection yoke of FIG. 7, and FIG. 9 is a deflection yoke of FIG. 3 is a connection diagram showing a connection state in FIG. 2, 4, and 3
Those having the same functions as those shown in are given the same numbers.

In this embodiment, the sub magnetic core 6 is composed of two E-shaped magnetic bodies, and the auxiliary vertical deflection coil 7 is provided.
The upper coil 7c located above the horizontal axis 25,
7d and the lower coil 7 positioned below the horizontal axis 25
2 and FIG. 4 is that it is configured only with e and 7f.
Unlike the configuration shown in FIG. 3, the connection on the side of the vertical deflection coil 3 is different from the connection shown in FIG.

In this embodiment, as shown in FIG. 9, a resistor circuit composed of resistors 22d and 22e and a thermistor 24 is connected in series between the upper coils 7c and 7d and the lower coils 7e and 7f. .. Then, these upper coils 7c,
7d, a resistor circuit (22d, 22e, 24) and a lower coil 7e, 7f, a series circuit of a diode 12a and a variable resistor 23b for blocking a first direction current, and a first direction. Diode 1 to block reverse current
2b and the series circuit of the variable resistor 23c are respectively connected in parallel. Furthermore, resistor circuits (22d, 22e, 2
The connection point of the pair of resistors 22d and the variable resistor 2 in 4)
A resistor 22b is connected between the variable resistance terminals 3b and 23c.

The variable resistors 23b and 23c and the resistor 22b in each of the above circuits are also used as a single component, but they may be configured as separate components so as to form a series circuit with the diodes 12a and 12b. good.

In this embodiment, the variable resistors 23b and 23c are used.
The variable resistance terminal of is set to the middle point, and the upper coils 7c, 7
By making the current flowing through d the same as the current flowing through the lower coils 7e and 7f, the correction amount for the arcuate misconvergence shown in FIG. 5A can be made zero.

Further, by moving the setting of the variable resistors 23b and 23c from the above-mentioned state, it is possible to correct any arcuate misconvergence including the sign independently on the upper half surface of the screen and the lower half surface of the screen. .. Therefore, FIG.
It is possible to correct misconvergence between the vertical lines 17R and 17B having different signs and sizes on the upper half surface of the screen and the lower half surface of the screen as shown in (e).

Correcting the misconvergence in FIG. 5E corresponds to correcting the arcuate misconvergence shown in FIG. 5A and the cross misconvergence shown in FIG. 5F at the same time. ..

Further, the resistance circuit (22d, 22e, 24)
Since the thermistor 24 is provided in the first embodiment, it is possible to correct the arcuate misconvergence that is stable with respect to the temperature change, as in the first embodiment described above.

FIG. 10 is a rear view showing a rear surface of a deflection yoke as a third embodiment of the present invention, FIG. 11 is a sectional view showing a cross section of a main part of the deflection yoke of FIG. 10, and FIG. 12 is a deflection yoke of FIG. 3 is a connection diagram showing a connection state in FIG. Those having the same operations as those shown in FIGS. 2, 4 and 3 are designated by the same reference numerals.

The present embodiment differs from the configurations shown in FIGS. 2 and 4 in that the sub magnetic core 6 is composed of two E-shaped magnetic bodies, and the connection on the side of the vertical deflection coil 3 is The connection is different from that shown in FIG.

In this embodiment, as shown in FIG.
Auxiliary vertical deflection coil (7a, 7b, 7c, 7)
d, 7e, 7f) to the series circuit of the upper coil 7c, 7d located on the upper side with respect to the horizontal axis 25 and the resistor circuit composed of the resistors 22d, 22e and the thermistor 24, the diode 12a-1, 12a-2 and resistor 22b
Two-stage shunt circuits composed of -1, 22b-2 and a variable resistor 23b are connected in parallel. Further, with respect to the series circuit of the lower coils 7e, 7f positioned below the horizontal axis 25 and the resistance circuits (22d, 22e, 24), the diodes 12b-1, 12b-2 and the resistor 22c are provided. -1,
A two-stage shunt circuit composed of 22c-2 and a variable resistor 23c is connected in parallel.

In this embodiment, the diode 12a-
2 and 12b-2 are made conductive by using an element having a low forward voltage V _F such as a Schottky diode when the vertical deflection current Iv has a small value, and the auxiliary vertical deflection coil 7 is provided.
A shunt is generated for the currents flowing through c, 7d, 7e, and 7f. On the other hand, the diodes 12a-1 and 12b-1 become conductive when the vertical deflection current Iv has a large value by using an element having a high forward voltage V _F such as a silicon diode, and the auxiliary vertical deflection coils 7c, 7d, 7e, and A shunt is generated for the current flowing through 7f.

Therefore, the diodes 12a-2, 12
By the variable resistors 23b and 23c and the resistors 22b-2 and 22c-2 connected in series with b-2, the correction amount of the arcuate misconvergence at the position where the vertical deflection amount is small is set,
With the resistors 22b-1 and 22c-1 connected in series with the diodes 12a-1 and 12b-1, it is possible to set the correction amount of the arcuate misconvergence at the position where the vertical deflection amount is large, and accurate correction is possible. It is possible.

Also, resistor circuits (22d, 22e, 24)
Since the thermistor 24 is provided in the first embodiment, it is possible to correct the arcuate misconvergence that is stable with respect to the temperature change, as in the first embodiment described above.

FIG. 13 is a connection diagram showing a connection state in the deflection yoke as the fourth embodiment of the present invention.
Those having the same functions as those shown in are given the same numbers. The configuration of the back surface of the deflection yoke and the cross section of the main part are similar to those shown in FIGS. 10 and 11.

In this embodiment, the diodes 12a-1 and 12a-12
a-2 and resistors 22b-1 and 22b-2 and variable resistor 2
3b connecting the shunt circuit and the diode 12b-
1, 12b-2, resistors 22c-1, 22c-2 and a variable resistor 23c are connected in a different manner from the connection of the shunt circuit shown in FIG.

In this embodiment, as shown in FIG. 13, a diode 12a-1 is connected in parallel to a series circuit of a diode 12a-2 and a resistor 22b-2, and a resistor 22b-1 is connected to the parallel circuit. The variable resistor 23b is connected in series. Also, the diode 12b-2 and the resistor 22c-2
The diode 12b-1 is connected in parallel to the series circuit of, and the resistor 22c-1 and the variable resistor 23 are further connected to the parallel circuit.
c are connected in series. Also in this embodiment, the diodes 12a-1 and 12b-1 are silicon diodes having a high forward voltage V _F , and the diodes 12a-2 and 12b-2 are Schottky diodes having a low forward voltage V _F. I'm using it. Therefore, the resistors 22b-2,
22c-2 allows diodes 12a-1, 12b-1
The advantage is that the conduction conditions can be changed.

By adjusting the variable resistors 23b and 23c, the diode 12a connected in parallel with each other is adjusted.
-1, 12a-2 and diodes 12b-1, 12b-
The current flowing in 2 can be changed at the same time. Therefore, even when the correction amount of the bow-shaped misconvergence shown in FIG. 5D is large, the bow-shaped misconvergence can be corrected with high accuracy.

FIG. 14 is a connection diagram showing a connection state in the deflection yoke as the fifth embodiment of the present invention.
Those having the same functions as those shown in are given the same numbers. The configuration of the back surface of the deflection yoke and the cross section of the main part are similar to those shown in FIGS. 10 and 11. In this embodiment, the connection on the side of the vertical deflection coil 3 is different from the connection shown in FIG.

In this embodiment, as shown in FIG. 14, the thermistor 24a and the resistor 22d are connected to the upper coils 7c and 7d.
The first resistance circuit consisting of
A second resistance circuit including a thermistor 24b and a resistor 22e is connected in series to e and 7f, and these series circuits are connected in parallel with each other. In addition, the diode 12a and the resistor 22b are provided in the first resistance circuit (22d, 24a).
And a first shunt circuit composed of a variable resistor 23b are connected in parallel, and the diode 1 is connected to the second resistor circuit (22e, 24b).
A second shunt circuit composed of 2b, a resistor 22c, and a variable resistor 23c is connected in parallel.

Vertical deflection current Iv when deflecting the upper half surface of the screen
14, the diode 12b conducts, and a larger current flows in the lower coils 7e and 7f than in the upper coils 7c and 7d. Therefore, the magnetic field 13a generated by the lower coils 7e, 7f becomes stronger than the magnetic field generated by the upper coils 7c, 7d, and a horizontal deflection force 15 in a direction away from each other is generated for the electron beams 14R, 14B at both ends. ..

When the vertical deflection current Iv flows when the lower half surface of the screen is deflected in the direction shown by the arrow Y2 in FIG. 14, the diode 12a is turned on and the upper coils 7c and 7d are connected. , Lower coils 7e, 7f
Greater current flows. Therefore, as shown in FIG. 11, the magnetic field 13a generated by the upper coils 7c and 7d is
It is stronger than the magnetic fields generated by the lower coils 7e and 7f, and produces a horizontal deflection force 15 in a direction in which the electron beams 14R and 14B at both ends are separated from each other. Therefore, also in this embodiment, as in the case of the above-described third embodiment, as shown in FIG.
The bow-shaped misconvergence shown in (a) can be corrected.

FIG. 15 is a rear view showing a rear surface of a deflection yoke as a sixth embodiment of the present invention, FIG. 16 is a sectional view showing a cross section of a main part of the deflection yoke of FIG. 15, and FIG. 17 is a deflection yoke of FIG. 3 is a connection diagram showing a connection state in FIG. Figure 10,
The same numbers are given to those having the same operations as those shown in FIGS. 11 and 12.

In this embodiment, among the auxiliary vertical deflection coils, E
The upper coils 7c and 7d located on the upper side with respect to the horizontal axis 25 of the character-shaped sub magnetic core 6 are each divided into two, and one is left on the upper side to form the coils 7c-1 and 7d-1, and the other. To the lower side to form the coils 7c-2 and 7d-2, and the lower coils 7e and 7f located on the lower side with respect to the horizontal axis 25 are each divided into two, one of which is the lower side. To the coils 7e-1, 7f-1, and the other is moved to the upper side to form the coils 7e-2, 7f-2, and the coils 7c-1, 7c-2, 7d-1, 7d-2 are first Of the coils 7e-1, 7e-2, 7f-
1 and 7f-2 are used as the second set of coils.
0 and the configuration shown in FIG. 11, the vertical deflection coil 3
The connection on the side is different from the connection shown in FIG.

In this embodiment, as shown in FIG.
Set of auxiliary vertical deflection coils 7c-1, 7c-2, 7d-
1, 7d-2, resistors 22d and 22e, and thermistor 2
4 is connected to the series circuit of the resistor circuit including the diodes 12a-1 and 12a-2 and the resistors 22b-1 and 22b-.
2 and a variable resistor 23b are connected in parallel to a two-stage shunt circuit. Further, the second set of auxiliary vertical deflection coils 7e-1, 7e-2, 7f-1, 7f-2 and the resistor 22
For a series circuit with a resistance circuit composed of d, 22e and the thermistor 24, a shunt circuit having a two-stage configuration composed of diodes 12b-1, 12b-2, resistors 22c-1, 22c-2 and a variable resistor 23c is provided. They are connected in parallel.

In this embodiment, the diode 12a-
2 and 12b-2 are made conductive by using an element having a low forward voltage V _F such as a Schottky diode when the vertical deflection current Iv has a small value, and the auxiliary vertical deflection coil 7 is provided.
c-1, 7d-1, 7e-1, 7f-1, 7c-2, 7
A shunt is generated for the currents flowing through d-2, 7e-2, and 7f-2. On the other hand, the diodes 12a-1 and 12b-1
Is conductive when the vertical deflection current Iv has a large value by using an element having a high forward voltage V _F such as a silicon diode, and the auxiliary vertical deflection coils 7c-1, 7c-2,
7d-1, 7d-2, 7e-1, 7e-2, 7f-1,
A shunt is generated for the current flowing through 7f-2.

Therefore, the diodes 12a-2, 12
The bow-shaped misconvergence is entirely corrected by the variable resistors 23b and 23c in series with b-2, and the bow-shaped misconvergence correction amount is corrected by the resistors 22b and 22c at a position where the vertical deflection amount is large. As a result, accurate correction is possible.

Further, in the case of this embodiment, auxiliary vertical deflection coils 7c-1, 7c-2, 7d-1, 7d-2, 7e.
-1, 7e-2, 7f-1, 7f-2 and the resistance circuit (22
d, 22e, 24) is connected in parallel to a circuit formed by connecting a variable resistor 23d in series between a pair of resistors 22f, and the resistance circuit (22d, 22e, 24d).
The connection point of the pair of resistors 22d in 24) is connected to the variable resistance terminal of the variable resistor 23d.

Therefore, by adjusting the variable resistor 23d, the coils 7c-1, 7c-2,
7d-1, 7d-2 and the second set of coils 7e-1, 7e
A difference between the vertical deflection current components of the sawtooth waves flowing in −2, 7f-1, and 7f-2 can be generated, and the cross-shaped misconvergence as shown in FIG. 5F can be corrected.

FIG. 18 is a rear view showing a rear surface of a deflection yoke as a seventh embodiment of the present invention, and FIG. 19 is a sectional view showing a cross section of a main part of the deflection yoke of FIG. Those having the same operations as those shown in FIGS. 2 and 4 are designated by the same reference numerals. The connection state in this embodiment is the same as the connection state shown in FIG.

In this embodiment, the sub magnetic core 6 is composed of two U-shaped magnetic bodies, and the auxiliary vertical deflection coil 7 is used.
Is composed of upper coils 7c and 7e arranged between the protrusions 6c and 6d of the upper sub magnetic core 6 on the vertical axis, and lower coils 7d and 7f arranged between the protrusions 6e and 6f of the lower sub magnetic core 6. In addition, the coils 7c and 7d are the coils of the first group, and the coils 7e and 7f are the coils of the second group, which is different from the configurations shown in FIGS. 2 and 4.

Here, the first set of coils 7c and 7d and the second set of coils 7e and 7f are wound and connected so as to generate quadrupole magnetic fields in mutually different directions. Therefore, the first set of coils 7c, 7d and the second set of coils 7e, 7f generate vertical deflection magnetic field components in mutually different directions on the horizontal central axis 25, and the horizontal directions in the same direction as each other. Generates a deflection magnetic field component.

In the present embodiment, the circuit configuration shown in FIG. 9 is adopted, and the first half corresponding to the case where the upper half surface of the screen is deflected.
When the vertical deflection current having the polarity of 5 flows, the currents flowing through the coils 7c and 7d of the first set are shunted, and the currents flowing through the coils 7c and 7d of the first set are divided into the coils 7e and 7d of the second set.
Since it can be made smaller than the current flowing through f, a magnetic field having the shape shown in FIG. 19 can be generated. Therefore, the arcuate misconvergence shown in FIG. 5A can be corrected as in the case of the second embodiment.

[0064]

According to the present invention, since it is constructed as described above, the following effects can be obtained.

That is, a magnetic body is arranged on the electron gun side of the deflection yoke, and the magnetic body is provided with a first set of auxiliary vertical deflection coils and a second set of auxiliary vertical deflection coils. Since the ratio of the current value of the vertical deflection current flowing in each of the two sets of auxiliary vertical deflection coils can be changed depending on the direction of the vertical deflection current, and the fluctuation of the ratio of this current value due to the temperature change can be reduced, the screen There is an effect that, in addition to the correction of the pincushion distortion and the coma aberration of the horizontal line raster in the upper and lower portions, the correction of the arcuate misconvergence between the vertical lines projected by the electron beams at both ends can be stably performed against the temperature change.

Further, since the value of the resistance connected in series to each of the first and second sets of auxiliary vertical deflection coils can be made small, the correction of the arcuate misconvergence between the vertical lines projected by the electron beams at both ends can be made with a small loss. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a side view showing a side surface of a deflection yoke as a first embodiment of the present invention.

FIG. 2 is a rear view showing the rear surface of the deflection yoke of FIG.

FIG. 3 is a connection diagram showing a connection state in the deflection yoke of FIG.

FIG. 4 is a cross-sectional view showing a cross section of an auxiliary vertical deflection coil in the deflection yoke of FIG.

FIG. 5 is an explanatory diagram showing an on-screen misconvergence pattern that can be corrected by the present invention.

FIG. 6 is an explanatory diagram for explaining the relationship between the shape of the magnetic field and the deflection force.

FIG. 7 is a rear view showing the rear surface of the deflection yoke as the second embodiment of the present invention.

8 is a cross-sectional view showing a cross section of a main part of the deflection yoke in FIG.

9 is a connection diagram showing a connection state in the deflection yoke of FIG.

FIG. 10 is a rear view showing the rear surface of the deflection yoke as the third embodiment of the present invention.

11 is a cross-sectional view showing a cross section of a main part of the deflection yoke in FIG.

12 is a connection diagram showing a connection state in the deflection yoke of FIG.

FIG. 13 is a connection diagram showing a connection state in a deflection yoke as a fourth embodiment of the present invention.

FIG. 14 is a connection diagram showing a connection state in a deflection yoke as a fifth embodiment of the present invention.

FIG. 15 is a rear view showing the rear surface of a deflection yoke as the sixth embodiment of the present invention.

16 is a cross-sectional view showing a cross section of a main part of the deflection yoke of FIG.

17 is a connection diagram showing a connection state of the deflection yoke of FIG.

FIG. 18 is a rear view showing the rear surface of the deflection yoke as the seventh embodiment of the present invention.

19 is a cross-sectional view showing a cross section of a main part of the deflection yoke of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Deflection yoke, 2 ... Horizontal deflection coil, 3 ... Vertical deflection coil, 4 ... Main magnetic core, 5 ... Separator, 6 (6a, 6)
b, 6c, 6d, 6e, 6f, 6g, 6h) ... Sub magnetic core, 7 (7a, 7b, 7c, 7c-1, 7c-2, 7)
d, 7d-1, 7d-2, 7e, 7e-1, 7e-2,
7f, 7f-1, 7f-2) ... Auxiliary vertical deflection coil, 8
... Electron gun side, 9 ... Static convergence magnet, 10 ... Color cathode ray tube, 11 ... Variable inductor, 12a, 12a-1, 12a-2, 12b, 12b
-1, 12b-2 ... Diode, 13a, 13b ... Magnetic field, 14B, 14G, 14R ... Electron beam, 15 ... Deflection force, 16 ... Cathode ray tube inner surface, 17B, 17R ... Vertical line, 18
(18B, 18G, 18R) ... Horizontal line raster, 19 ... Phosphor screen, 20 ... Correction direction, 21 ... Electron gun, 22a, 22b,
22b-1, 22b-2, 22c, 22c-1, 22c
-2, 22d, 22e ... Resistors, 23a, 23b, 23
c, 23d ... Variable resistor, 24, 24a, 24b ... Thermistor, 25 ... Horizontal axis, 26a, 26b ... Diagonal axis.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Fukuma, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside Visual Media Research Laboratory, Hitachi, Ltd. (72) Inventor Michitaka Osawa 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Incorporated company Hitachi, Ltd. Visual Media Research Laboratory (72) Inventor Isao Yoshimi 3300 Hayano, Mobara-shi, Chiba Hitachi Mobara Plant (72) Inventor Atsushi Takeyama 1 Kitano, Masaki, Mizusawa-shi, Iwate Hitachi, Ltd. Mizusawa Electronics (72) Inventor Masao Ohara, Kitano, No. 1 Masaki, Mizusawa-shi, Iwate Hitachi Hitachi Mizusawa Electronics

Claims (8)

[Claims] 1. A color cathode ray tube for forming an in-line array of multi-electron beams arranged on an axis coinciding with a horizontal center axis, which is used by attaching the horizontal deflection coil and the vertical deflection coil around a main magnetic core. In the deflection yoke, the sub-magnetic core is disposed on the electron gun side of the deflection yoke, and at least the first set of auxiliary vertical deflection coils and the second set of auxiliary vertical deflection coils are wound around the sub-magnetic core. Connecting the first and second sets of auxiliary vertical deflection coils in series or in parallel with each other, and connecting the first and second sets of auxiliary vertical deflection coils to the vertical deflection coils, respectively. By supplying all or a part of the vertical deflection current to the first and second sets of auxiliary vertical deflection coils, vertical magnetic field components are respectively generated by the first and second sets of auxiliary vertical deflection coils. The water A resistance circuit, which is generated so that the respective directions on the central axis are different from each other and whose resistance value has a negative temperature coefficient, is connected in series to the auxiliary vertical deflection coils of the first and second sets. However, a shunt circuit including at least a diode that changes the ratio of the current values of the vertical deflection currents flowing through the first and second sets of auxiliary vertical deflection coils depending on the flowing direction of the vertical deflection currents in the vertical deflection coils. Is connected in parallel with the resistance circuit and in parallel or in series with each of the auxiliary vertical deflection coils of the first and second sets. 2. The deflection yoke according to claim 1, wherein
The deflection yoke, wherein the resistance circuit includes a resistor and a thermistor. 3. The deflection yoke according to claim 1, wherein all or part of the auxiliary vertical deflection coils of the first set are arranged above the horizontal central axis in the sub magnetic core, All or part of the second set of auxiliary vertical deflection coils is arranged below the horizontal central axis in the sub magnetic core, and the first and second auxiliary magnetic deflection coils are arranged below the horizontal central axis.
Of the pair of auxiliary vertical deflection coils connected in series with each other, the first shunt circuit of the shunt circuit to be connected to the first set of auxiliary vertical deflection coils is the first shunt circuit.
A second shunt circuit to be connected in parallel to the series circuit consisting of the set of auxiliary vertical deflection coils and the resistance circuit and to be connected to the second set of auxiliary vertical deflection coils of the second set. A deflection yoke, which is connected in parallel to a series circuit including an auxiliary vertical deflection coil and the resistance circuit. 4. The deflection yoke according to claim 1, wherein all or a part of the first set of auxiliary vertical deflection coils are arranged above the horizontal central axis in the sub magnetic core, All or part of the second set of auxiliary vertical deflection coils is arranged below the horizontal central axis in the sub magnetic core, and the first and second auxiliary magnetic deflection coils are arranged below the horizontal central axis.
Said pair of auxiliary vertical deflection coils are connected in parallel with each other, said resistance circuit is connected in series to each of said first and second sets of auxiliary vertical deflection coils, A first shunt circuit to be connected to the first set of auxiliary vertical deflection coils is connected in parallel to a first resistance circuit of the resistance circuits connected to the first set of auxiliary vertical deflection coils. A second shunt circuit to be connected in series to the first set of auxiliary vertical deflection coils and to be connected to the second set of auxiliary vertical deflection coils is a second set of the resistance circuits. And a second resistance circuit connected to the auxiliary vertical deflection coil in parallel, and connected in series to the second set of auxiliary vertical deflection coils in series. 5. The deflection yoke according to claim 1, 2, 3, or 4, wherein the shunt circuit is formed by connecting at least a plurality of the diodes in parallel. 6. The deflection yoke according to claim 5, wherein
A deflection yoke, wherein forward voltages of the plurality of diodes are different from each other. 7. The deflection yoke according to claim 1, wherein
A third set of auxiliary vertical deflection coils is wound around the sub-magnetic core and connected to the vertical deflection coil so that all or part of the vertical deflection current flows through the third set of auxiliary vertical deflection coils. A deflection yoke characterized by the above. 8. A color cathode ray tube for forming a multi-electron beam in an in-line arrangement, and a deflection yoke according to any one of claims 1 to 9 to be used by being attached to the color cathode ray tube. A color cathode ray tube device characterized in that