JPH0937278A - Deflection yoke, color cathode ray tube using the deflection yoke and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct longitudinal mis-convergence fluctuated in both positive and negative directions with simple adjustment. SOLUTION: A 1st bridge circuit is formed by vertical deflection auxiliary coils 7a, 7b provided to a side of an electron gun of a deflection yoke and generating a 4-pole magnetic field component and resistors 14d, 14e, a 2nd bridge circuit consisting of diodes 18a-18d is connected to the 1st bridge circuit, a variable resistor 15c is connected between midpoints of the 2nd bridge circuit and a slider terminal of the variable resistor 15c is connected to a point at the outside of the 1st bridge circuit. The variable resistor corrects the longitudinal line mis-convergence continuously in positive/negative directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for use in a color cathode ray tube for forming an in-line multi-electron beam and a color cathode ray tube device and a display device having the deflection yoke, and more particularly to a convergence. The present invention relates to improvement of a deflection yoke provided with a correction means.

[0002]

2. Description of the Related Art Deflection yokes equipped with convergence correction means are disclosed, for example, in Japanese Patent Laid-Open Nos. 3-82290 and 5-14914.
These conventional correction means connect a pair of vertical deflection auxiliary coils that generate a quadrupole magnetic field component in parallel or in series,
By providing a variable resistor and a diode for adjusting the current flowing in each vertical deflection auxiliary coil, misconvergence of vertical lines at the top and bottom of the screen is corrected.

[0003]

However, these conventional correction means cannot correct the misconvergence in which the vertical lines at the top and bottom of the screen are shifted in the same direction by the positive and negative continuous adjustment operation by one variable resistor. Therefore, if misconvergence occurs due to manufacturing error such that the vertical lines at the top and bottom of the screen fluctuate in both positive and negative directions with reference to approximately 0, this misconvergence is corrected by adjusting one variable resistor. There is a problem that you cannot do it.

Further, the rate of change in the correction amount of the misconvergence of the vertical lines at the top and bottom of the screen with respect to the change in the resistance value of the variable resistor increases remarkably in the region where the resistance value of the variable resistor is small, so fine adjustment is required. There was a problem that it was difficult to do.

A first object of the present invention is to provide a deflection yoke capable of correcting misconvergence in which vertical lines at the upper and lower portions of the screen are displaced in the same direction by a continuous adjustment operation by one variable resistor, and the deflection yoke. It is an object of the present invention to provide a color cathode ray tube device and a display device having the above.

A second object of the present invention is that the rate of change in the amount of correction of misconvergence of vertical lines at the top and bottom of the screen with respect to the amount of change in the resistance value of the variable resistor is in the region where the resistance value of the variable resistor is small. It is an object of the present invention to provide a deflection yoke which is easy to make fine adjustment by suppressing the change in a large area, and a color cathode ray tube device and a display device including the deflection yoke.

[0007]

One feature of the present invention is that:
In a deflection yoke having a horizontal deflection coil and a vertical deflection coil for a color cathode ray tube equipped with an electron gun for generating an in-line array of multiple electron beams, a vertical deflection auxiliary coil is provided on the electron gun side of the deflection yoke, and the vertical deflection auxiliary coil is provided. The deflection auxiliary coil includes a first auxiliary coil that generates a quadrupole magnetic field component and a second auxiliary coil that generates a quadrupole magnetic field component in a direction opposite to the quadrupole magnetic field component.
A first series circuit including a first resistor connected in series with the first auxiliary coil, and a second series circuit including a second resistor connected in series with the second auxiliary coil. A series circuit is formed, one end of the first auxiliary coil and one end of the second auxiliary coil are connected to each other, one end of the first resistor and one end of the second resistor are connected to each other, and Two series circuits are connected in parallel, the circuits connected in parallel are connected in series with the vertical deflection coil, and the connection point between the first auxiliary coil and the first resistor, the second auxiliary coil and the second auxiliary coil are connected.
A series circuit of a first diode in which a pair of diodes are connected in series in the same direction between a connection point of the resistor and a pair of diodes in series in a direction opposite to the series circuit of the first diode. Connecting the series circuit of the second diode in parallel relation, and connecting the pair of diodes in the first series circuit to the connection point of the pair of diodes in the second series circuit. Both ends are connected, and the variable terminal of the variable resistor is connected to one end of the first resistor and the second terminal.
The resistors are connected at one end to each other or to a connection point outside the parallel circuit with respect to the connection point.

The first and second auxiliary coils are provided in a sub-core, and the connection point between the first auxiliary coil and the first resistor or the second auxiliary coil. A resistor is connected between the connection point of the second resistor and the connection point of the variable terminal of the variable resistor.

Further, both ends of the second variable resistor are connected between the connection point of the first auxiliary coil and the first resistor and the connection point of the second auxiliary coil and the second resistor. The variable terminal of the variable resistor is connected to a connection point of the first resistor and the second resistor via a resistor.

Another feature of the present invention is a deflection yoke having a horizontal deflection coil and a vertical deflection coil for a color cathode ray tube having an electron gun for generating an in-line array of multiple electron beams. A vertical deflection auxiliary coil is provided on the side, and the vertical deflection auxiliary coil includes a first auxiliary coil that generates a quadrupole magnetic field component and a second auxiliary coil that generates a quadrupole magnetic field component in a direction opposite to the quadrupole magnetic field component. Equipped with
A first series circuit in which a first resistor is connected in series with the first auxiliary coil, and a second series circuit in which the first auxiliary circuit is connected in series with the second auxiliary coil.
Connecting a second series circuit in which a resistor is connected in series to the vertical deflection coil in series, and connecting a diode bridge circuit in parallel to the third series circuit. Further, both ends of the variable resistor are connected to the output terminal of the diode bridge circuit, and the variable terminal of the variable resistor is connected to the connection point of the first series circuit and the second series circuit.

The first and second auxiliary coils are provided on the sub core.

In addition, a resistor is connected to both terminals of the third series circuit and a circuit passing through a diode between a connection point of the first series circuit and the second series circuit. To do.

Still another feature of the present invention is a color cathode ray tube device equipped with the above-mentioned deflection yoke and a display device using the color cathode ray tube device.

[0014]

The currents flowing through the first auxiliary coil and the second auxiliary coil that generate the quadrupole magnetic field component are differentially changed by the current flowing through the diode and one variable resistor. The strength and direction of the magnetic field can be continuously adjusted by adjusting one variable resistor.

In the region where the resistance value of the variable resistor acts as a small resistance value with respect to the first auxiliary coil which generates the quadrupole magnetic field component, the resistance value of the variable resistor is changed to the second auxiliary coil which generates the quadrupole magnetic field component. On the other hand, in a region that acts as a large resistance value and acts as a large resistance value with respect to the first auxiliary coil that generates the quadrupole magnetic field component, Since it acts as a small resistance value, the fluctuation of the rate of change in the amount of correction of misconvergence of the vertical lines at the top and bottom of the screen with respect to the change in the resistance value of the variable resistor is reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a partially cutaway side view showing a color cathode ray tube device having a deflection yoke according to the present invention. Reference numeral 1 is a deflection yoke, which is a horizontal deflection coil 2, a vertical deflection coil 3,
A main core 4, a separator 5, a sub core 6, a vertical deflection auxiliary coil 7 and a terminal cover 8 are provided. Reference numeral 9 is an electron gun, 10 is a static convergence magnet, 11 is a color cathode ray tube, and 12 is a fluorescent screen.

The deflection yoke 1 is attached to the neck portion of a color cathode ray tube 11 having a fluorescent screen 12 on the front surface, and an electron gun 9 for forming an in-line array of multiple electron beams is attached to the tip portion of the neck portion. There is. The horizontal deflection coil 2 and the vertical deflection coil 3 of the deflection yoke 1 are both formed in a square shape, and a main core 4 made of a magnetic material is arranged on the outer periphery of the horizontal deflection coil 2 and the vertical deflection coil 3. Further, on the electron gun 9 side of the deflection yoke 1, a sub core 6 around which a vertical deflection auxiliary coil 7 is wound is provided.

FIG. 3 shows the first part of the deflection yoke 1 shown in FIG.
6 is a rear view of a portion of the vertical deflection auxiliary coil 7 of the embodiment of FIG. Reference numerals 6a and 6b are sub-cores, 7a and 7c are upper coils of the vertical deflection auxiliary coil 7, and 7b and 7d are lower coils thereof.

The sub core 6 is composed of two U-shaped sub cores 6a and 6b which are vertically opposed to each other with the neck portion of the color cathode ray tube 11 interposed therebetween. The two sub-cores 6a and 6b are
It is made of soft magnetic material such as sintered ferrite or silicon steel plate. Upper coils 7a and 7c forming a part of the vertical deflection auxiliary coil 7 are wound around the sub core 6a together, and a lower side of the sub core 6b which also forms another part of the vertical deflection auxiliary coil 7 is formed. The coils 7b and 7d are wound together.

FIG. 1 is a circuit diagram showing a deflection control system for supplying a control current to each coil described above. 2a, 2
b is a coil that constitutes the horizontal deflection coil 2, 3a and 3b are right and left coils that constitute the vertical deflection coil 3, and 13
Is a variable inductor, 14a to 14h are fixed resistors, 15
a to 15c are variable resistors, 16a is a thermistor, 18a
18d is a diode, 31 is a horizontal deflection circuit (HD
C) and 32 are vertical deflection circuits (VDC).

One terminal of each of the horizontal deflection coils 2a and 2b is commonly connected to one terminal of the horizontal deflection circuit 31, and a variable inserter 13 is connected between the other terminals. The variable inductor 13 has an intermediate tap, and this intermediate tap is connected to the other terminal of the horizontal deflection circuit 31. The variable inductor 13 is for adjusting the balance of the currents flowing in the horizontal deflection coils 2a and 2b by changing the inductance between the intermediate tap and the terminals of the horizontal deflection coils 2a and 2b.
It is provided to correct misconvergence between the horizontal lines 23B and 23R formed by the electron beams 19B and 19R on both sides shown in (a).

The vertical deflection circuit 32 includes a vertical deflection coil 3
Right coil 3a and left deflection coil 3 of the vertical deflection coil 3
b, a fixed resistor 14c, a fixed resistor 14d, a series connection circuit of the upper coil 7a of the vertical deflection auxiliary coil 7, a fixed resistor 14e, and a lower coil 7b of the vertical deflection auxiliary coil 7.
A circuit in which the serial connection circuits of 5 are connected in parallel, the upper coil 7c of the vertical deflection auxiliary coil 7, and the lower coil 7d of the vertical deflection auxiliary coil 7 are connected in series in this order.

The right coil 3a and the left coil 3b
The series connection circuit of the fixed resistor 14a, the variable resistor 15a, and the fixed resistor 14b is connected in parallel with the series connection circuit of, and the variable terminal of the variable resistor 15a is connected to the connection point of the right coil 3a and the left coil 3b. Has been done. Therefore, the right coil 3a, the left coil 3b, and the fixed resistors 14a, 14
b and the variable resistor 15a form a bridge circuit, and the variable resistor 15a is adjusted to adjust the right coil 3a and the left coil 3
By adjusting the balance of the currents flowing in b, the electron beams 19B and 19R on both sides as shown in FIG.
It is possible to correct misconvergence between the horizontal lines 23B and 23R formed by. The convergence adjusting means may be provided if necessary and may be omitted.

The series circuit composed of the thermistor 16a and the fixed resistor 14f connected in parallel with the fixed resistor 14c forms an impedance circuit, and the impedance circuit has a negative resistance temperature coefficient. Is configured as follows.

A variable resistor 15b is connected in parallel with the series circuit of the upper coil 7c and the lower coil 7d connected in series, and the variable terminal of the variable resistor 15b is connected to the upper side via a fixed resistor 14g. Coil 7c and lower coil 7d
Is connected to the connection point of. Therefore, the upper coil 7c, the lower coil 7d, the fixed resistor 14g, and the variable resistor 15b.
Form a bridge circuit, and by adjusting the variable resistor 15b to adjust the balance of the currents flowing through the upper coil 7c and the lower coil 7d, the electron beams 19B on both sides as shown in FIG. Misconvergence between the vertical lines 24B and 24R formed by 19R can be corrected.

Further, the fixed resistor 14d and the upper coil 7a.
Between the fixed resistor 14e and the lower coil 7b, a series circuit of a first diode in which a pair of diodes 18a and 18b are connected in series in the same direction, and a pair of diodes 18c. , 18d are connected in series in the opposite direction to the series circuit of the first diode to connect a series circuit of a second diode, and the connection point of the pair of diodes 18a and 18b of the first series circuit and the first series circuit are connected. Both ends of the variable resistor 15c are connected between the connection points of the pair of diodes 18c and 18d of the two series circuits. The variable terminal of the variable resistor 15c is connected via the fixed resistor 14h between the left coil 7b of the vertical deflection auxiliary coil 7 and the connection point of the fixed resistor 14c.

Here, when the variable terminal of the variable resistor 15c is at the midpoint, the current I2 flowing through the upper coil 7a and the current I1 flowing through the lower coil 7b are equal, and therefore the vertical line misconvergence does not change. However, the variable resistor 1
When the variable terminal of 5c is moved to the connection point side of the diodes 18a and 18b, the current I2 flowing through the upper coil 7a and the lower coil 7 with respect to the vertical deflection current Iv shown in FIG.
The difference current (I1-I2) of the current I1 flowing in b is shown in FIG.
The waveform is as shown in (b).

For this reason, the vertical deflection auxiliary coils 7a to 7d
4A when the upper part of the screen is vertically deflected.
The magnetic field 20 shown in FIG. 4 is generated, and when the lower part of the screen is vertically deflected, the magnetic field 20 shown in FIG. 4B is generated. Then, each electron beam 19B, 19G, 19R
Includes a deflection force 21B, as shown in FIGS.
Since 21G and 21R act, vertical line misconvergence deviated in the direction shown in FIG. 5B can be corrected.

Conversely, when the variable terminal of the variable resistor 15c is moved to the connection point side of the diodes 18c and 18d, the current I2 flowing through the upper coil 7a and the lower coil 7b are reversed.
The magnitude relation of the current I1 flowing in the
Vertical line misconvergence deviated in the direction shown in (a) can be corrected.

Further, the resistance value R15c of the variable resistor 15c
The relationship between the vertical line misconvergence correction amount Δc and the vertical line misconvergence correction amount Δc is a characteristic in which the slope of the correction amount Δc increases when the resistance value R15c is small as shown in FIG. Since the actions of the diodes 18a and 18b and the actions of the diodes 18c and 18d are added,
As shown in FIG. 8A, the relationship between the resistance value R15c and the vertical line misconvergence correction amount Δc is such that the slope is substantially uniform.

Since the impedance circuit formed by the fixed resistors 14c and 14f and the thermistor 16a is constructed so that the resistance value has a negative temperature coefficient,
Even if the forward voltage of the diodes 18a to 18d changes due to the temperature change, the voltage applied to the diodes 18a to 18d also changes at the same time so that the correction characteristics are kept substantially constant.

FIG. 9 is a circuit diagram of a vertical deflection control system showing a second embodiment of the present invention. 14i and 14j are fixed resistors. The parts corresponding to the constituent parts in the embodiment shown in FIG.

The second embodiment differs from the first embodiment shown in FIG. 1 in that the fixed resistor 14h is omitted and the fixed resistors 14 are provided at both ends of the variable resistor 15c.
This is the point where i and 14j are connected. Also, the variable resistor 15
b and the fixed resistor 14g are removed from the series connection circuit of the upper coil 7c and the lower coil 7d, and fixed resistors 14d, 1
4e and connected so as to form a bridge circuit.

In this embodiment, fixed resistors 14i, 14
By making the resistance values of j different from each other, as shown in FIG.
It is possible to obtain the effect that the correction range of vertical line misconvergence as shown in (a) and (b) can be made different in the case of the direction of FIG. .

Further, as in this embodiment, the variable resistor 15
Even if b is connected, vertical line misconvergence as shown in FIG. 7C can be corrected.

FIG. 10 is a circuit diagram of a vertical deflection control system showing a third embodiment of the present invention. 14k and 14m are fixed resistors. The same components as those in the embodiment shown in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

The third embodiment is largely different from the first embodiment shown in FIG. 1 in that a first series circuit in which an upper coil 7a and a fixed resistor 14d are connected in series and a lower coil 7 are connected.
This is the point where a second series circuit in which b and the fixed resistor 14e are connected in series is connected in series. Further, the fixed resistor 14c is omitted, and the series circuit of the fixed resistor 14f and the thermistor 16a, which are connected in parallel to the fixed resistor 14c, is replaced by the fixed resistor 14c.
It is connected in parallel with the series connection circuit of d and 14e. Further, the upper coil 7c and the lower coil 7d are omitted, and the circuit in which the fixed resistor 14k, the variable resistor 15b, and the fixed resistor 14m are connected in series is used as the first series circuit and the second series circuit in series. It is connected in parallel with the series connection circuit connected to. The variable terminal of the variable resistor 15b is connected to the connection point of the fixed resistors 14d and 14e.

Further, the diode 1 is connected in parallel with a series connection circuit in which the first series circuit and the second series circuit are connected in series.
A diode bridge circuit constituted by 8a to 18d is connected, both ends of the variable resistor 15c are connected to the output terminal of the diode bridge circuit, and the variable terminal of the variable resistor 15c, the first series circuit and the second Is connected to the connection point of the serial circuit via the fixed resistor 14h.

Therefore, when the variable terminal of the variable resistor 15c is moved to the connection point side of the diodes 18a and 18b, the current I2 flowing through the upper coil 7a is different from the vertical deflection current Iv shown in FIG. 6A. The difference current (I1-I2) of the current I1 flowing through the lower coil 7b has a waveform as shown in FIG. 6 (b).

Therefore, the vertical deflection auxiliary coils 7a to 7d
4A when the upper part of the screen is vertically deflected.
The magnetic field 20 shown in FIG. 4 is generated, and when the lower part of the screen is vertically deflected, the magnetic field 20 shown in FIG. 4B is generated. Thereby, each electron beam 19B, 19G, 1
9R has a deflection force 21 as shown in FIGS. 4 (a) and 4 (b).
Since B, 21G, and 21R act, vertical line misconvergence deviated in the direction shown in FIG. 5B can be corrected.

On the contrary, when the variable terminal of the variable resistor 15c is moved to the connecting point side of the diodes 18c and 18d, the current I1 flowing through the lower coil 7b and the upper coil 7a are moved.
The magnitude relation of the current I2 flowing in the
Vertical line misconvergence deviated in the direction shown in (a) can be corrected.

Further, the resistance value R15c of the variable resistor 15c
The relationship between the vertical line misconvergence correction amount Δc and the vertical line misconvergence correction amount Δc is such that, in this embodiment, the actions of the diodes 18a to 18d are added, so that the resistance value R15c is as shown in FIG.
And the vertical line misconvergence correction amount Δc have a characteristic that the inclination is substantially uniform.

Since the fixed resistor 14f and the thermistor 16a are connected to the fixed resistors 14d and 14e, the temperature coefficient of the resistance value of the first series circuit and the second series circuit becomes negative, and the temperature change By the diodes 18a-18d
Even if the forward voltage of 1 changes, the voltage applied to the diodes 18a to 18d also changes at the same time, and the correction characteristic can be kept substantially constant.

Although the upper coil 7c and the lower coil 7d are omitted in this embodiment, if the upper coil 7c and the lower coil 7d are provided as in the embodiment of FIG. Even under the condition of generating a magnetic field of the same strength required as, the number of turns of the upper coil 7a and the lower coil 7b can be reduced, and the inductance can be reduced.

FIG. 11 is a block diagram of a display device using the color cathode ray tube device constructed as described above.

The video circuit 30 has a video signal input terminal 2
The electron gun 9 is controlled in accordance with the video signal input from 7. The horizontal deflection circuit (HDC) 31 controls the horizontal deflection coil 2 in the deflection yoke 1 in accordance with the horizontal synchronization signal input from the horizontal synchronization signal input terminal 28. The vertical deflection circuit (VDC) 32 controls the vertical deflection coil 3 including the vertical deflection auxiliary coils 7a to 7d in the deflection yoke 1 according to the vertical synchronization signal input to the vertical synchronization signal input terminal 29. Further, the high voltage circuit 33 uses the horizontal synchronization signal to generate a high voltage.

The display device having such a configuration can easily perform an adjusting operation for correcting misconvergence.

The vertical deflection auxiliary coil in each of the above-described embodiments has shown an example of generating a magnetic field in which a quadrupole magnetic field component is superimposed on a uniform magnetic field component in the horizontal direction.
It may simply generate only a quadrupole magnetic field. Also, 1
The number of coils constituting the pair of vertical deflection auxiliary coils and the shape of the sub core provided with the vertical deflection auxiliary coils are not limited to these examples, and a U-shaped or E-shaped sub core is provided on the left and right. It may be.

[0050]

According to the present invention, a coil for generating a first quadrupole magnetic field component forming a vertical deflection auxiliary coil and the first coil are provided.
The current flowing through each of the coils that generate the second quadrupole magnetic field component in the direction opposite to the quadrupole magnetic field component can be changed differentially by adjusting one variable resistor. Therefore, there is an effect that the misconvergence in which the vertical lines at the upper and lower portions of the screen are shifted in the same direction can be corrected by the positive and negative continuous adjustment operations.

Further, since the correction actions of the four diodes are combined, the rate of change in the correction amount of misconvergence of the vertical lines at the top and bottom of the screen relative to the change in resistance value of the variable resistor is determined by the resistance value of the variable resistor. The difference between the small and large cases is small, and there is an effect that the convergence adjustment using the variable resistor can be performed more finely.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a deflection control system in a color cathode ray tube device according to the present invention.

FIG. 2 is a partially longitudinal side view showing a color cathode ray tube device including a deflection yoke according to the present invention.

FIG. 3 is a rear view showing the vertical deflection auxiliary coil portion of the first embodiment of the deflection yoke shown in FIG.

4 is a diagram showing changes in a vertical deflection magnetic field by the vertical deflection auxiliary coil shown in FIG.

FIG. 5 is a diagram showing a convergence pattern for explaining the operation of the color cathode ray tube device according to the present invention.

FIG. 6 is a waveform diagram showing a vertical deflection current and a difference current flowing in a main part for explaining the operation of the deflection yoke according to the present invention.

FIG. 7 is a diagram showing a convergence pattern for explaining the operation of the first embodiment of the deflection yoke according to the present invention.

FIG. 8 is a characteristic diagram of misconvergence correction amount for explaining the operation of the deflection yoke according to the present invention in comparison with a conventional device.

FIG. 9 is a circuit diagram of a vertical deflection control system showing a second embodiment of the color cathode ray tube device according to the present invention.

FIG. 10 is a circuit diagram of a vertical deflection control system showing a third embodiment of the color cathode ray tube device according to the present invention.

FIG. 11 is a block diagram of a display device according to the present invention.

[Explanation of symbols]

1 ... Deflection yoke, 2, 2a, 2b ... Horizontal deflection coil,
3, 3a, 3b ... Vertical deflection coil, 4 ... Main core, 6, 6
a, 6b ... Sub-core, 7 ... Vertical deflection auxiliary coil, 7a, 7
c ... upper coil, 7b, 7d ... lower coil, 8 ... terminal plate cover, 9 ... electron gun, 10 ... static convergence magnet, 11 ... color cathode ray tube, 12 ... phosphor screen, 13 ... variable inductor, 14a ... 14m ... Fixed resistor, 15a-15c ... Variable resistor, 16a ... Thermistor, 18a-18d ... Diode, 19B, 19G, 1
9R ... Electron beam, 20 ... Vertical deflection magnetic field, 21B, 21
G, 21R ... Deflection force, 23B, 23R ... Horizontal line, 24B,
24R ... Vertical line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Soichi Sakurai 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Multimedia system development headquarters (72) Inventor Koji Fukuma Yoshida, Totsuka-ku, Yokohama, Kanagawa 292, Machi, Hitachi Ltd., Multimedia Systems Development Headquarters (72) Inventor, Katsuyuki Kawakami, 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture, Hitachi, Ltd. Multimedia Systems Development HQ (72) Inventor, Hiroshi Yoshioka Chiba 3300 Hayano, Mobara-shi, Japan Within Hitachi, Ltd. Electronic Device Division (72) Inventor Masayuki Abe 1 Kitano, Mashiro, Mizusawa-shi, Iwate Hitachi Media Electronics Co., Ltd.

Claims (9)

[Claims] 1. A deflection yoke having a horizontal deflection coil and a vertical deflection coil for a color cathode ray tube having an electron gun for generating multiple electron beams in an in-line arrangement, wherein a vertical deflection auxiliary coil is provided on the electron gun side of the deflection yoke. And a vertical deflection auxiliary coil for generating a quadrupole magnetic field component
First series circuit including a second auxiliary coil for generating a quadrupole magnetic field component in a direction opposite to the quadrupole magnetic field component, and a first resistor connected in series with the first auxiliary coil. Forming a second series circuit in which a second resistor is connected in series with the second auxiliary coil, and connecting one end of the first auxiliary coil and one end of the second auxiliary coil to each other, One end of the first resistor and one end of the second resistor are connected to each other to connect the two series circuits in parallel, the parallel connected circuit is connected to the vertical deflection coil in series, and A series of first diodes formed by connecting a pair of diodes in series in the same direction between the connection point between the auxiliary coil and the first resistor and the connection point between the second auxiliary coil and the second resistor. Circuit and a pair of diodes in the opposite direction to the series circuit of the first diode A series circuit of second diodes connected in series is connected in a parallel relationship, and variable between a connection point of the pair of diodes in the first series circuit and a connection point of the pair of diodes in the second series circuit. Both ends of the resistor are connected, and the variable terminal of the variable resistor is connected to the point where one end of the first resistor and one end of the second resistor are connected to each other or further outside the parallel circuit than the connection point. A deflection yoke that is connected to a connection point. 2. The deflection yoke according to claim 1, wherein the first and second auxiliary coils are provided in a sub core. 3. A variable terminal of the variable resistor according to claim 1, wherein the connection point between the first auxiliary coil and the first resistor or the connection point between the second auxiliary coil and the second resistor, and the variable terminal of the variable resistor. A deflection yoke, wherein a resistor is connected between the connection points of. 4. The connection point between the first auxiliary coil and the first resistor, the second auxiliary coil and the second auxiliary coil according to claim 1.
The two ends of the second variable resistor are connected between the connection points of the resistors, and the variable terminal of the variable resistor is connected to the first terminal via the resistor.
A deflection yoke connected to the connection point between the second resistor and the second resistor. 5. A deflection yoke having a horizontal deflection coil and a vertical deflection coil for a color cathode ray tube having an electron gun for generating an in-line array of multiple electron beams, wherein a vertical deflection auxiliary coil is provided on the electron gun side of the deflection yoke. And a vertical deflection auxiliary coil for generating a quadrupole magnetic field component
First series circuit including a second auxiliary coil for generating a quadrupole magnetic field component in a direction opposite to the quadrupole magnetic field component, and a first resistor connected in series with the first auxiliary coil. And a third series circuit in which a second series circuit in which a second resistor is connected in series with the second auxiliary coil is connected in series, and the third series circuit is connected in series with the vertical deflection coil. A diode bridge circuit is connected in parallel to the series circuit, and further, both ends of the variable resistor are connected to the output terminal of the diode bridge circuit, and the variable terminals of the variable resistor are connected to the first series circuit and the second series circuit. A deflection yoke connected to a connection point of a series circuit. 6. The deflection yoke according to claim 5, wherein the first and second auxiliary coils are provided in a sub core. 7. The resistor according to claim 5, wherein a resistor is connected to both terminals of the third series circuit and a circuit passing through a diode between a connection point of the first series circuit and the second series circuit. A deflection yoke characterized by the above. 8. A color cathode ray tube device having the deflection yoke according to claim 1 attached thereto. 9. A display device using the color cathode ray tube device according to claim 8.