JP3358283B2 - Deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a three electron gun in-line type color picture tube. It is another object of the present invention to provide a deflection yoke which can easily adjust misconvergence caused by variations in a vertical deflection magnetic field and can obtain high-quality convergence characteristics.

[0002]

2. Description of the Related Art In an image display apparatus using a three electron gun in-line type color picture tube, a total of three electron beams (R: red, G:
A self-convergence type deflection yoke is often used to concentrate (convergence) green (B: blue) on a screen screen.

A deflection yoke of the self-convergence type has a pair of saddle-type (saddle-type) horizontal deflection coils (symmetrical with respect to the deflection yoke X axis) shown in FIG. In general, it is constituted by a pair of saddle-type (saddle-type) vertical deflection coils on the left and right (symmetric with respect to the Y axis of the deflection yoke). This deflection yoke deflects the electron beam by using a pincushion distortion type (pincushion) horizontal deflection magnetic field as shown in FIG.
A barrel-deflection (barrel-shaped) vertical deflection magnetic field as shown in FIG.

Here, the center beam (G) is insufficiently deflected due to the nature of the barrel-distorted magnetic field generated by the vertical deflection coil. In order to compensate for the insufficient deflection, a coma aberration correction coil is provided at a position closer to the electron gun than horizontal and vertical deflection coils. The coma aberration correction coil forms a strong pincushion distortion type auxiliary vertical deflection magnetic field as shown in FIG.
With this auxiliary vertical deflection magnetic field, a more accurate convergence characteristic is obtained.

The X-axis and Y-axis are set as reference axes of the deflection yoke and set as shown in FIG. The horizontal direction (horizontal direction) of the screen is the X axis, and the vertical direction (vertical direction)
Is the Y axis.

In general, deflection yokes that are mass-produced often have deviations in the generated magnetic field from the set magnetic field due to variations in coil winding and variations in assembly of the deflection yoke body. Therefore, the adjuster manually arranges various magnetic pieces or the like in the vicinity of the deflection coil for each deflection yoke and locally distorts the deflection magnetic field to absorb variations, thereby achieving good convergence characteristics and good convergence characteristics. I was trying to be. However, this adjustment work is very time-consuming, and the adjustment time greatly depends on the condition of the deflection coil and the skill of the adjuster. Therefore, the adjustment work is a major factor disturbing the flow of production, which has led to an increase in production costs.

For this reason, various deflection yokes have been proposed in the past to facilitate the adjustment operation. For example, JP
No. 0-253136 describes a YH misconvergence caused by a deviation of a vertical deflection magnetic field (FIG. 15A, FIG.
(Refer to (b)), the current is easily adjusted by using a correction coil and a diode bridge circuit and controlling the current with a variable resistor. However, according to the present invention, the current flows in only one direction in the correction coil, and the correction is performed according to the magnitude of the current. Therefore, the misconvergence adjustment of the deflection coil is further performed while the deflection coil is previously corrected by the correction circuit. There was annoyance that it had to be done.

In order to make the convergence adjustment easier, the present applicant supplies a current in two directions, positive and negative, to the correction coil, and arranges a deflection yoke capable of setting a circuit independently of the deflection coil. No. 405001168, filed on January 17, 1994 (hereinafter referred to as the earlier application).

The deflection yoke of the earlier application generates a positive YH misconvergence (see FIG. 15 (a)) which occurs when the magnetic field is too barrel-distorted due to a variation in the vertical deflection magnetic field, and a pincushion distortion when the magnetic field is too distortion-shaped. Negative YH
Misconvergence (see FIG. 15B) can be easily corrected electrically.

FIG. 7 shows the correction circuit. At least one
A pair of coma aberration correction coils L1,
L2 are connected in series. Coma aberration correction coils L1, L
Numeral 2 is wound around a substantially U-shaped magnetic piece, and is positioned so as to face vertically to a position closer to the electron gun than the deflection coil.
As described above, a strong pincushion distortion type vertical deflection magnetic field is formed as shown in FIG. Due to this magnetic field, the center beam (G) becomes a side beam (R, B).
More deflection. The state of the deflection force acting on each electron beam is shown by arrows 1G, 1R, and 1B in FIG.

Returning to FIG. 7, diodes D1, D2, D3, and D3 are provided at both ends of a pair of coma aberration correction coils L1 and L2.
Input terminals d and e of the diode bridge circuit composed of D4
Is connected. Two fixed terminals of a three-terminal variable resistor VR1 are connected between the output terminals f and g of the diode bridge circuit, respectively. And a three-terminal variable resistor V
The movable terminal of R1 is the upper coil L of the coma aberration correction coil.
1 and the lower coil L2.

Next, the YH misconvergence correction operation of the deflection yoke will be described. A vertical deflection current IV having a sawtooth (sawtooth) waveform as shown in FIG. 8 is supplied to the vertical deflection coil. Of course, the coma aberration correction coil L connected in series with the vertical deflection coil
The same current IV flows through 1 and L2. Here, it is assumed that the diode of the diode bridge circuit is set to turn on immediately after the vertical deflection is started.

At the time of upward deflection of the screen, the diodes D1 and D3 in the diode bridge circuit are turned on, and a current flows through a path of the diode D1, the resistor VR1, and the diode D3. Equivalently, the circuit state shown in FIG.

In FIG. 10A, when the movable terminal C of the variable resistor VR1 is located at the electrical center (middle point) between the fixed terminals A and B, a current IL1 flowing through the upper coil L1 of the coma aberration correction coil and It is equal to the current IL2 flowing through the lower coil L2. Naturally, the current ID1 flowing through the diode D1 is equal to the current ID3 flowing through the diode D3, and no current flows between the contact points of the movable terminal C and the coils L1 and L2. (IC = 0)

When the movable terminal C of the variable resistor VR1 is closer to the fixed terminal A than the middle point, the resistance value of the variable resistor VR1 between A and C decreases and the resistance value between B and C increases. IL
1 <IL2, ID1> ID3. At this time, the magnetic field generated from the coma aberration correction coils L1 and L2 is as shown in FIG.
The lower side as shown in (a) becomes a vertically asymmetric pincushion magnetic field that is stronger than the upper side, and the side beams (R, B) are deflected not only in the vertical direction (Y-axis direction) but also in the horizontal direction (X-axis direction). In this case, a force to deflect the side beam R in the positive direction of the X-axis and a force to the side beam B in the negative direction of the X-axis are applied. Arrows 3R, 3G, and 3B indicate the directions of the deflection force acting on each electron beam.

When the screen is deflected downward, the diodes D2 and D4 in the diode bridge circuit are turned on, and a current flows through a path of the diode D4, the resistor VR1, and the diode D2. Equivalently, the circuit state shown in FIG.

In FIG. 10B, when the movable terminal C of the variable resistor VR1 is located at the midpoint between the fixed terminals A and B, the description has been made in the state at the midpoint in FIG. 10A. And the current relationship is the same. When the movable terminal C of the variable resistor VR1 is closer to the fixed terminal A than the middle point, the A-
Since the resistance between C decreases and the resistance between B and C increases, IL1> IL2 and ID2 <ID4. At this time, the magnetic field generated from the coma aberration correction coils L1 and L2 becomes a vertically asymmetric pincushion magnetic field in which the upper side is stronger than the lower side as shown in FIG. 11B, and the side beams (R, B)
Is deflected not only in the vertical direction (Y-axis direction) but also in the horizontal direction (X-axis direction). The force to do is added.

When the movable terminal C of the variable resistor VR1 is closer to the fixed terminal B than the middle point, the operation is reversed, and X is applied to the side beam R in both upward deflection and downward deflection of the screen. A force that deflects the side beam B in the negative axis direction and the side beam B in the positive X axis direction is applied.

Therefore, by shifting the movable terminal C of the variable resistor VR1 from the middle point, FIGS. 15A and 15B
YH misconvergence in both positive and negative directions as shown in FIG. By utilizing this fact, the deflection yoke of the earlier application can correct the misconvergence caused by the variation of the vertical deflection magnetic field by an easy operation.

[0020]

However, in the deflection yoke of the prior application, when the movable terminal C of the variable resistor VR1 is shifted from the middle point, a new misconvergence slightly occurs as shown in FIG. The problem of coming was found. This is because if the current flowing through one of the coma aberration correction coils L1 and L2 is diverted too much to the diode side, the strength of the auxiliary vertical deflection magnetic field that compensates for the insufficient deflection of the center beam is weakened.

According to the present invention, it is easy to adjust misconvergence caused by variations in the vertical deflection magnetic field.
Further, it is another object of the present invention to provide a deflection yoke capable of obtaining high-quality convergence characteristics without generating new misconvergence in the adjustment process.

[0022]

Accordingly, in order to solve the above-mentioned problems, the present invention provides a self-convergence system comprising at least one pair of saddle type horizontal deflection coils and at least one pair of saddle type vertical deflection coils. A deflection yoke in which at least one pair of saddle-type vertical deflection coils of the saddle-type vertical deflection coils is connected in series with a pair of coma aberration correction coils, the two resistances connected in series. Elements are connected between input terminals of a diode bridge circuit composed of at least four diodes, two fixed terminals of a three-terminal variable resistance element are respectively connected to output terminals of the diode bridge circuit, A correction in which a correction coil for generating a quadrupole magnetic field is connected between a connection point and a movable terminal of the three-terminal variable resistance element. Road and is intended to provide a deflection yoke, characterized in that connected in series to at least a pair of saddle type vertical deflection coils of the coma aberration correcting said saddle vertical deflection coil coil is connected.

[0023]

FIG. 1 shows a correction circuit portion which is a main part of a first embodiment of the present invention. The first difference from the earlier application is that
Coma aberration correction coils L1 and L2 are connected between input terminals d and e of a diode bridge circuit including diodes D1 to D4.
However, the point is that the fixed resistors R1 and R2 are connected (the resistors R1 and R2 are connected in series). Coma aberration correction coil L
1 and L2 are not connected between the input terminals of the diode bridge circuit but are simply connected in series to the vertical deflection coil.

The second difference is that a quadrupole magnetic field (on the horizontal axis (X axis) and vertical axis of the deflection yoke) as shown in FIG. 6 is applied between the movable terminal C of the variable resistor VR1 and the connection point of the resistors R1 and R2. This is a point where new correction coils L3 and L4 are connected to generate a quadrupole magnetic field having the same poles opposing each other across an intersection of the horizontal axis and the vertical axis except on the axis (Y axis). This correction coil
A coil wound on the same magnetic piece as the coma aberration correction coils L1 and L2 is located on the upper coil L1 side, and L3 is located on the lower coil L2 side.

Next, the operation of the first embodiment will be described. Each diode of the diode bridge circuit is set to be turned on immediately after the vertical deflection starts as in the conventional case. When the movable terminal C of the variable resistor VR1 is at the electrical center (middle point) between the fixed terminals A and B, no current IC flows between the movable terminal C and the connection point between the resistors R1 and R2.

When the screen is deflected upward, the diodes D1 and D3 in the diode bridge circuit are turned on, and the diode D1, the variable resistor VR1, and the like in the diode bridge circuit are turned on.
A current flows through a path of the diode D3. Equivalently, the circuit state shown in FIG.

In FIG. 5A, when the movable terminal C of the variable resistor VR1 is closer to the fixed terminal A than the middle point, the resistance value of the variable resistor VR1 between A and C decreases, and the resistance between B and C becomes smaller. Since the resistance value increases, the currents IR1, R1 flowing through the resistors R1, R2
IR2 becomes IR1 <IR2, and diodes D1 and D1
The currents ID1 and ID3 flowing through 3 satisfy ID1> ID3. Therefore, the current IC is supplied from the movable terminal C to the resistors R1 and R2.
Flows toward the connection point.

When the screen is deflected downward, the diodes D2 and D4 in the diode bridge circuit are turned on, and a current flows through the diode bridge circuit through paths D4, VR1, and D2, and equivalently, the circuit shown in FIG. State.
In this state, when the movable terminal C of the variable resistor VR1 is closer to the fixed terminal A than the middle point, IR1> IR2, ID2 <ID
The current IC flows from the movable terminal C to the connection point between the resistors R1 and R2, as in the case of the upward deflection on the screen.

That is, when the movable terminal C of the variable resistor VR1 is at a certain position on the fixed terminal A side from the middle point, the current IC
Becomes a current waveform shown in FIG. 9 corresponding to the waveform of the vertical deflection current shown in FIG. Since this current IC flows through the correction coils L3 and L4, as the electron beam is deflected to the periphery of the screen, the correction coils L3 and L4 gradually apply a correction magnetic field as shown in FIG. 6 to the deflection magnetic field. breath,
The side beam R receives a force deflected in the positive X-axis direction, and the side beam B receives a force deflected in the negative X-axis direction. Arrows 2R and 2B in FIG. 6 indicate the directions of the deflection forces acting on the electron beams R and B. Therefore, the convergence characteristic can be changed as shown in FIG. By adjusting the position of the movable terminal C of the variable resistor VR1 between the midpoint and the fixed terminal A, the value of the current IC can be controlled. Therefore, in this embodiment, the magnitude of the deflection force due to the correction magnetic field (ie, The amount of change in the convergence characteristic)
And the negative YH as shown in FIG.
Misconvergence can be easily corrected.

On the other hand, when the movable terminal C of the variable resistor VR1 is closer to the fixed terminal B than the middle point, the operation is reverse to that when the movable terminal C is closer to the fixed terminal A. Can be changed as shown in FIG. Therefore, by adjusting the position of the movable terminal C of the variable resistor VR1 between the middle point and the fixed terminal B, this embodiment can easily eliminate the positive YH misconvergence as shown in FIG. Can be corrected.

Even if the variable resistor VR1 is adjusted, the value of the current flowing through the coma aberration correction coils L1 and L2 does not change in this embodiment, so that the auxiliary vertical deflection magnetic field generated from the coma aberration correction coils L1 and L2 is affected. Without giving
There is no adverse effect that the misconvergence shown in FIG. 16 occurs in the deflection yoke of the earlier application.

As described above, in the first embodiment, the variable resistor VR
By adjusting 1, misconvergence caused by variations in the vertical deflection magnetic field can be easily corrected, and no new misconvergence is generated by the correction operation, so that high-quality convergence characteristics can be obtained.

Next, a second embodiment is shown in FIG. The correction circuit of the second embodiment includes a fixed terminal A or B of the variable resistor VR1.
Is connected to an output terminal of a diode bridge circuit via a fixed resistor R3 (the resistor R3 is connected to the fixed terminal A in the figure). In this case, even when the movable terminal C of the variable resistor VR1 is at the middle point, the current IC flows through the correction coils L3 and L4, so that the misconvergence as shown in FIGS. This is particularly effective for correcting the yoke.

FIG. 3 shows a third embodiment. The correction circuit of the third embodiment corrects positive and negative YH cross-misconvergence of the type shown in FIGS. 17A and 17B (YH misconvergence caused by the center of the vertical deflection magnetic field being shifted in the vertical direction). Is added. The fixed terminal of the second variable resistor VR2 is connected between the input terminals of the diode block circuit, and the movable terminal of the variable resistor VR2 is connected to the movable terminal of the variable resistor VR1 via the fixed resistors R4 and R5. Then, correction coils L3 and L4 are connected between a connection point between the fixed resistors R4 and R5 and a connection point between the fixed resistors R1 and R2. In the third embodiment, by adding the circuit, the movable terminal of the variable resistor VR2 is moved, so that the circuit shown in FIG.
Misconvergence of the type shown in (b) can be corrected. Of course, by moving the movable terminal of the variable resistor VR1, the YH misconvergence shown in FIGS. 15A and 15B (YH misconvergence generated when the vertical deflection magnetic field is too barrel-distorted or pincushion-distorted). Can of course be corrected. The correction range by the variable resistor VR2 is adjusted by the value of the resistor R4, and the correction range by the variable resistor VR1 is adjusted by the value of the resistor R5.

As described above, in the third embodiment, two types of different YH misconvergences can be corrected independently and over the entire screen, so that an optimum correction can be made in accordance with each type of misconvergence. Higher quality convergence characteristics can be obtained.

Next, a fourth embodiment is shown in FIG. In this embodiment, the upper coil L1 of the coma aberration correction coil is connected between the resistor R1 of the first embodiment and one input terminal d of the diode bridge circuit, and the resistor R2 and the other input terminal of the diode bridge circuit. The lower coil L2 of the coma aberration correction coil is connected between the lower coil e. in this case,
Since the coma aberration correction coils L1 and L2 enter between the input terminals of the diode bridge circuit, moving the movable terminal C of the variable resistor VR1 causes misconvergence as shown in FIG. By operation, the occurrence of the misconvergence is minimized.

Next, a fifth embodiment will be described. In this embodiment, in the circuits of the first to fourth embodiments shown in FIGS. 1 to 4, the quadrupole magnetic field generated from the correction coils L3 and L4 is changed as shown in FIGS. 18 (a) and 18 (b). It is formed in. That is, the quadrupole magnetic field is a magnetic field symmetrical with respect to the horizontal axis (X axis) or the vertical axis (Y axis) of the deflection yoke, and is on the horizontal axis (X axis) or the vertical axis (Y axis).
(Axis), the magnetic field of which the same pole is opposed.

When a quadrupole magnetic field is formed in this way, the electron beam R is deflected in the direction of arrow 5R and the electron beam B is deflected in the direction of arrow 5B shown in FIG. Are deflected in the opposite directions to the Y axis, and positive and negative Y as shown in FIGS. 19 (a) and 19 (b).
V misconvergence (YV misconvergence caused by rotation and displacement of the vertical deflection magnetic field) can be corrected by adjusting the variable resistor VR1.

Further, in the embodiment in which the three-terminal variable resistor VR2 as shown in FIG. 3 is added, not only the above-mentioned YV misconvergence but also other types as shown in FIGS. 19 (c) and 19 (d). The positive / negative YV misconvergence (YV misconvergence generated when the center of the vertical deflection magnetic field is shifted in the horizontal direction) is changed by the variable resistor VR2.
Can be corrected by adjusting. If the variable resistor VR2 is provided, the two types of different YV misconvergence can be separately and independently corrected by the variable resistors VR1 and VR2, so that the optimum correction can be performed according to each type of misconvergence. High quality convergence characteristics can be obtained.

Next, a sixth embodiment will be described. This embodiment is different from the circuits of the first to fourth embodiments shown in FIGS. 1 to 4 in that the magnetic fields generated from the correction coils L3 and L4 are not quadrupole magnetic fields, but are shown in FIGS. 20 (a) and 20 (b). A magnetic field as shown in FIG. That is, it is formed as a six-pole magnetic field symmetrical with respect to the horizontal axis (X axis) of the deflection yoke or a barrel-distorted magnetic field symmetrical with respect to the horizontal axis of the deflection yoke.

When the magnetic field is formed in this manner, the R and B of the electron beam are deflected in the same direction on the Y axis as indicated by arrows 6R and 6B shown in FIG.
Is deflected in the direction opposite to R and B as described above, or deflected with a small amount of deflection even in the same direction as R and B. Therefore, the positive and negative Vs as shown in FIGS.
CR misconvergence can be corrected by adjusting the variable resistor VR1.

Further, in the embodiment in which the three-terminal variable resistor VR2 as shown in FIG. 3 is added, not only the above-mentioned VCR misconvergence but also other types as shown in FIGS. 21 (c) and 21 (d) are used. The positive and negative VCR misconvergence can be corrected by adjusting the variable resistor VR2. If the variable resistor VR2 is provided, the variable resistor VR1
And VR2, the two types of different VCR misconvergence can be separately and independently corrected, so that the optimum correction can be made in accordance with each type of misconvergence, and higher quality convergence characteristics can be obtained.

A plurality of pairs of vertical deflection coils (saddle type or toroidal type vertical deflection coils) are provided on the deflection yoke.
In such a case, the correction circuit may be connected in series to at least one pair of the vertical deflection coils among the vertical deflection coils in which the pair of coma aberration correction coils are connected in series.

Further, each embodiment includes a combination of the second and third embodiments, a combination of the second and fourth embodiments, and a combination of the third and fourth embodiments. Combinations are of course conceivable. Further, at which deflection position the diode is turned on at the time of upward deflection and at the time of downward deflection may be adjusted according to the degree of occurrence of misconvergence.

Here, in each of the above-described first to sixth embodiments, two diodes connected in series are turned on immediately after the vertical deflection starts. The voltage required to turn on the two diodes connected in series is obtained from the voltage across the fixed resistors R1 and R2 connected in series. Therefore, the resistance values of the fixed resistors R1 and R2 are determined by the voltage value required to turn on the two diodes connected in series. In general, in a vertical deflection circuit, an increase in the DC resistance of the circuit leads to a deterioration in the vertical deflection sensitivity. Therefore, the DC resistance of the correction circuit should be kept as small as possible. In the embodiment described below, the diode that is turned on immediately after the start of vertical deflection is two diodes connected in parallel, and the DC resistance value of the correction circuit is suppressed to a smaller value.

In the following embodiment, a vertical deflection circuit is provided with a correction circuit for supplying a parabolic waveform to a correction coil for generating a quadrupole magnetic field, as in the above-described embodiment. FIG. 22 shows a principle diagram of the correction circuit.

A diode circuit composed of two diodes D1 and D2 connected in series with the same polarity and a resistance circuit composed of two fixed resistors R1 and R2 connected in series are connected to correction coils L3 and L4 for generating a quadrupole magnetic field. Are connected in parallel to both ends f and g. A connection point d between the two diodes D1 and D2 of the diode circuit and a fixed resistor R of the resistor circuit;
At least one fixed resistor R3 is connected between the connection point e of R1 and R2, and both ends d and e of the fixed resistor R3 are connection points with the outside. The correction circuit having this configuration is provided in series with the vertical deflection coil.

The correction coils L3 and L4 have the same specifications as the conventional correction coil. The correction coils L3 and L4 are the same as the conventional coma aberration correction coils L1 and L2 (the coma aberration correction coils L1 and L2 are substantially (A pair of upper and lower magnetic pieces are wound around a magnetic piece). The correction coil L3 is wound around the upper coil L1.
4 is wound on the lower coil L2 side. When current is supplied to the correction coils L3 and L4, FIG.
3 (a) or (b), a quadrupole magnetic field (except on the horizontal axis (X-axis) and the vertical axis (Y-axis) of the deflection yoke, the same poles are aligned with the horizontal axis and the vertical axis). (A quadrupole magnetic field that opposes the intersection of the two). FIG.
In the case of the magnetic field shown in FIG. 3A, the electron beam R is deflected in the positive direction of the X axis, and the electron beam B is deflected in the coaxial negative direction. In the case of the magnetic field shown in FIG. R
Is deflected in the negative direction of the X axis, and B of the electron beam is deflected in the coaxial positive direction. Arrows 2R and 2B in the figure indicate the deflection direction of the electron beam. The correction coils L3 and L4 may be provided by winding on a magnetic piece different from the coma aberration correction coils L1 and L2.

A vertical deflection current IV having a waveform shown in FIG. 8 is supplied to the correction circuit, and the IV is divided into a current IR3 flowing through the fixed resistor R3 and a current ID flowing through the diode circuit. The diodes D1 and D2 are set to be turned on immediately after the vertical deflection starts.

When the screen is deflected upward in the vertical direction, the diode D
1 is turned on, and the current ID is the current IR flowing through the fixed resistor R1.
1 and a current IC flowing in a circuit in which the correction coils L3 and L4 and the fixed resistor R2 are connected in series. At this time, the current IC flowing in the correction coil flows from the connection point f to the connection point g.

When the screen is deflected downward in the vertical direction, the diode D
2 is turned on, and the current ID is the current IR flowing through the fixed resistor R2.
2 and a current IC flowing in a circuit in which the correction coils L3 and L4 and the fixed resistor R1 are connected in series. Also at this time, the current IC flowing in the correction coil flows from the connection point f to the connection point g.

That is, a parabolic current having a waveform shown in FIG. 24A is supplied to the correction coils L3 and L4 as in the conventional case. However, the amount cannot be controlled by the circuit as it is.

In the circuit of FIG. 22 described above, between the connection point d of the diodes D1 and D2 of the diode circuit and the terminal of the fixed resistance R3 to which the connection point d was connected, or the resistances R1 and R2. And the fixed resistance R
3 is connected to a terminal on the side to which the connection point e is connected, a variable resistor is connected to the correction coil L.
3. It is possible to control the amount of current IC shown in FIG. Then, the convergence characteristic of YH can be changed. The correction circuit to which the variable resistance is added is a circuit shown in FIG. However, in order to correct the misconvergence of YH by the correction circuit shown in FIG. 25, the magnetic field distribution of the coils must be set in advance while the current IC is supplied to the correction coils L3 and L4. As described, the adjustment work becomes complicated.

Therefore, similarly to the above-described first to sixth embodiments, a circuit capable of supplying a current having a parabolic waveform in both positive and negative directions shown in FIGS. 24A and 24B to the correction coils L3 and L4. Is shown in FIG. This is the seventh embodiment.

As shown in FIG. 26, a first diode circuit composed of two diodes D1 and D2 connected in series to each other in the same polarity, and a series connection in the same polarity to the first diode circuit with the opposite polarity to the first diode circuit. Two diodes D3, D
4 and a resistance circuit including fixed resistors R1 and R2 connected in series are connected in parallel to both ends f and g of correction coils L3 and L4 that generate a quadrupole magnetic field. Further, the fixed terminals a and b of the three-terminal variable resistor VR1 are connected to a connection point d between the two diodes D1 and D2 of the first diode circuit and a connection point h between the two diodes D3 and D4 of the second diode circuit. Respectively. At least one fixed resistor R is connected to the movable terminal c of the variable resistor VR1.
7, one terminal of the fixed resistor R3 is connected. The fixed resistor R3 forms an impedance circuit. The other terminal of the fixed resistor R3 is connected to a connection point e of the fixed resistors R1 and R2 of the resistor circuit. Both ends of the fixed resistor R3 are connection points with the outside. The correction circuit having the above configuration is connected in series to a vertical deflection coil in which the coma aberration correction coils L1 and L2 are connected in series. The impedance circuit (here, the fixed resistor R3) may be a circuit in which a plurality of fixed resistors are connected in series, a circuit including an inductor, or the like.

Next, the circuit operation of the correction circuit will be described. The vertical deflection current IV entering the correction circuit is divided into a current IR3 flowing through the fixed resistor R3 and a current ID flowing through the diode circuit. Diodes D1, D2, D3, D
4 is set to be turned on immediately after the vertical deflection is started. During upward deflection in the vertical direction of the screen, the diodes D1 and D4 are turned on. At this time, the variable resistor VR1
The current flowing between c and a of the variable resistor VR1 and the diode D1 is ID1, and the current flowing between c and b of the variable resistor VR1 and the diode D4 is ID4.

At the time of the downward deflection in the vertical direction of the screen, the diodes D2 and D3 are turned on. At this time, the variable resistance V
The current flowing between a and c of R1 and the diode D2 is represented by ID2.
The current flowing between bc of the variable resistor VR1 and the diode D3 is defined as ID3.

When the movable terminal c of the variable resistor VR1 is at the midpoint (a-
When the resistance value between c and the resistance value between b and c are equal to each other), the current ID1 flowing through the diode D1 and the current ID4 flowing through the diode D4 are equal (ID1 = ID4) during the upward deflection, and At the time of side deflection, the current ID2 flowing through the diode D2 and the current ID3 flowing through the diode D3 are equal (ID2 = ID3), so that no current flows through the correction coils L3 and L4 (current IC = 0 flowing through the correction coil).

The movable terminal c of the variable resistor VR1 is connected to the a-side (a-
When the resistance value between c and c is smaller than the resistance value between b and c), the current ID1 flowing through the diode D1 becomes larger than the current ID4 flowing through the diode D4 during upward deflection (ID1> ID4). Coil L3, L
4 flows in the direction from the connection point f to the connection point g, and the current I flowing through the diode D2 at the time of downward deflection.
Since D2 is larger than the current ID3 flowing through the diode D3 (ID2> ID3), the current IC flowing through the correction coils L3 and L4 similarly flows from the connection point f to the connection point g.

The movable terminal c of the variable resistor VR1 is connected to the b side (a-
When the resistance value between c and c is greater than the resistance value between b and c), the operation is reverse to the operation when it is on the a side. The flowing current IC flows from the connection point g to the connection point f.

That is, in the seventh embodiment, the variable resistor VR
By moving the movable terminal c, the correction coil L
3. Since the current IC flowing through L4 can be controlled in exactly the same way as in the first embodiment, both the positive and negative YH misconvergence shown in FIGS. 15A and 15B (the vertical deflection magnetic field is too barrel-distorted or YH misconvergence caused by excessive pincushion distortion can be corrected. Of course, no new misconvergence is generated by this misconvergence correction.

Further, the correction circuit in this embodiment differs from the correction circuit of the above-described embodiment in which two diodes connected in series to the fixed resistors R1 and R2 are simultaneously turned on, and is parallel to the fixed resistors R1 and R2. Is a correction circuit that operates by turning on two diodes connected to the fixed resistor R.
The DC resistance values of R1 and R2 can be reduced to about の of the above-described embodiment. Therefore, in the seventh embodiment, the DC resistance value of the correction circuit can be reduced to about の of the above-described embodiment,
Since the increase in the DC resistance value of the vertical deflection system to which the correction circuit is added can be suppressed smaller than that in the above-described embodiment, deterioration of the vertical deflection sensitivity due to the increase in the DC resistance value can be minimized.

Next, an eighth embodiment is shown in FIG. The correction circuit according to the eighth embodiment is configured to connect at least one of the fixed terminals a and b of the variable resistor VR1 of the seventh embodiment shown in FIG. 26 to a connection point d between the diodes D1 and D2 via a fixed resistor R8,
Alternatively, it is connected to a connection point h between the diodes D3 and D4 (in the illustrated example, the fixed terminal a is connected to a connection point d between the diodes D1 and D2 via a resistor R8). In this case, the current IC can be supplied to the correction coils L3 and L4 even when the movable terminal c of the variable resistor VR1 is at the middle point, so that the misconvergence as shown in FIGS. This is particularly effective for correction in the case where the error occurs.

FIG. 28 shows a ninth embodiment. The correction circuit of the ninth embodiment adds a second three-terminal variable resistor VR2 to the correction circuit of the seventh embodiment shown in FIG.
It is also possible to correct positive and negative YH cross-misconvergence (YH misconvergence caused by the vertical deviation of the center of the vertical deflection magnetic field) of the types shown in FIGS. A fixed terminal p of a second three-terminal variable resistor VR2 is connected to both ends f and g of the correction coils L3 and L4.
q respectively, and the movable terminal r of the variable resistor VR2 is
A fixed resistor R3 is connected to a terminal of the fixed resistor R3 to which the fixed resistors R1 and R2 are not connected via a fixed resistor R4. By moving the movable terminal r of the variable resistor VR2, FIG.
YH misconvergence of the types shown in FIGS. Of course, by moving the movable terminal of the variable resistor VR1, the YH misconvergence shown in FIGS. 15A and 15B (YH misconvergence generated when the vertical deflection magnetic field is too barrel-distorted or pincushion-distorted). Can of course be corrected. The correction range by the variable resistor VR2 is adjusted by the value of the resistor R4, and the correction range by the variable resistor VR1 is adjusted by the value of the resistor R7.

As described above, in the ninth embodiment, since two types of different YH misconvergence can be corrected independently and over the entire screen, the optimum correction can be made in accordance with each type of misconvergence. Higher quality convergence characteristics can be obtained.

A well-known example having a configuration similar to that of the present embodiment is Japanese Utility Model Laid-Open No. Sho 62-153759. The known correction circuit corrects misconvergence in the upper half of the screen using a first variable resistor, and corrects misconvergence in the lower half of the screen using a second variable resistor. It does not compensate. On the other hand, in the present embodiment, by providing two variable resistors corresponding to the type of misconvergence, each type of misconvergence can be independently corrected over the entire screen, and an optimum correction pattern is obtained. Which is significantly different from known examples.

In the tenth embodiment shown in FIG. 29, the variable resistor VR1 is removed from the ninth embodiment shown in FIG.
Only the YH cross miss convergence of the type shown in FIGS. 1A and 1B is corrected.

In the eleventh embodiment shown in FIG. 30, a variable resistor circuit (variable resistor V) is connected in series with diodes D1 and D2.
(A variable resistor circuit including a variable resistor R3 and a fixed resistor R6 and a variable resistor circuit including a variable resistor VR4 and a fixed resistor R6). In the correction circuit described with reference to FIG. 25, the correction coil L at the time of upper deflection and lower deflection in the vertical direction of the screen is used.
3. The current value supplied to L4 is simultaneously controlled by the variable resistor VR1. On the other hand, in the circuit of the eleventh embodiment, the value of the current supplied to the correction coils L3 and L4 is changed by the variable resistor VR3 during the upward deflection and by the variable resistor VR during the downward deflection.
4, the misconvergence in the upper half of the screen and the misconvergence in the lower half of the screen can be separately corrected. In this case, misconvergence adjustment work can be performed while looking at only half of the screen, so that it is easy for a beginner to make adjustments. However, different types of YH misconvergence shown in FIGS. 15 and 17 are corrected together in the upper half and the lower half of the screen, and independent correction for each type cannot be performed.

Next, a twelfth embodiment will be described. This embodiment is different from the circuits of the seventh to eleventh embodiments shown in FIGS.
The polar magnetic field is formed as shown in FIGS. 18 (a) and (b). That is, the quadrupole magnetic field is a magnetic field symmetrical with respect to the horizontal axis (X axis) or the vertical axis (Y axis) of the deflection yoke, and is on the horizontal axis (X axis) or the vertical axis (Y axis).
(Axis), the magnetic field of which the same pole is opposed.

When a quadrupole magnetic field is formed in this way, the electron beam R is deflected in the direction of arrow 5R and the electron beam B is deflected in the direction of arrow 5B shown in FIG. Are deflected in the opposite directions to the Y axis, and the positive and negative YV misconvergence as shown in FIGS. 19A and 19B (YV misconvergence caused by the rotation and displacement of the vertical deflection magnetic field). ) Can be corrected by adjusting the variable resistor VR1. (When applied to the embodiment shown in FIG. 30, the variable resistor V
By adjusting R3, the correction can be made by adjusting the variable resistor VR4 during the downward deflection. )

Further, in the embodiment in which a three-terminal variable resistor VR2 as shown in FIG. 28 is added, not only the above-mentioned YV misconvergence but also other types of positive and negative as shown in FIGS. 19 (c) and (d). YV misconvergence (YV misconvergence generated when the center of the vertical deflection magnetic field is shifted in the horizontal direction) can be corrected by adjusting the variable resistor VR2. (When applied to the embodiment shown in FIG. 30, the variable resistor VR
In the case of the downward adjustment, the adjustment can be made by adjusting the variable resistor VR4. )

If the variable resistor VR2 is provided, the variable resistor VR
By using 1 and VR2, two types of different YV misconvergence can be separately and independently corrected, so that optimum correction can be performed in accordance with each type of misconvergence, and higher quality convergence characteristics can be obtained.
(However, when applied to the embodiment shown in FIG. 30, different types of misconvergence cannot be separately corrected.)

Next, a thirteenth embodiment will be described. This embodiment is different from the circuits of the seventh to eleventh embodiments shown in FIGS. 26 to 30 in that the magnetic fields generated from the correction coils L3 and L4 are not quadrupole magnetic fields but are shown in FIGS. 20 (a) and 20 (b). It is formed in such a magnetic field. That is, it is formed as a six-pole magnetic field symmetrical with respect to the horizontal axis (X axis) of the deflection yoke or a barrel-distorted magnetic field symmetrical with respect to the horizontal axis of the deflection yoke.

When the magnetic field is formed in this manner, the R and B of the electron beam are deflected in the same direction on the Y axis as indicated by arrows 6R and 6B shown in FIG.
Is deflected in the direction opposite to R and B as described above, or deflected with a small amount of deflection even in the same direction as R and B. Therefore, positive and negative VCR misconvergence as shown in FIGS. 21A and 21B can be corrected by adjusting the variable resistor VR1. (When applied to the embodiment shown in FIG. 30, correction can be made by adjusting the variable resistor VR3 during upward deflection, and by adjusting the variable resistor VR4 during downward deflection.)

Further, in the embodiment in which a three-terminal variable resistor VR2 as shown in FIG. 28 is added, not only the above-mentioned VCR misconvergence but also other types of positive and negative as shown in FIGS. 21 (c) and (d). VCR misconvergence
It can be corrected by adjusting the variable resistor VR2. (When applied to the embodiment shown in FIG. 30, correction can be made by adjusting the variable resistor VR3 during upward deflection, and by adjusting the variable resistor VR4 during downward deflection.)

If the variable resistor VR2 is provided, the variable resistor VR
1 and VR2, the two types of different VCR misconvergence can be separately and independently corrected, so that the optimum correction can be made according to each type of misconvergence, and higher-quality convergence characteristics can be obtained. (However, when applied to the embodiment shown in FIG. 30,
Different types of misconvergence cannot be corrected separately. )

When a plurality of pairs of vertical deflection coils are provided in the deflection yoke, at least one pair of the vertical deflection coils, in which a pair of coma aberration correction coils are connected in series, is corrected. Circuits may be connected in series.

Also, combinations of the embodiments can be considered. Furthermore, at the time of upward deflection and at the time of downward deflection,
At which deflection position the diode is turned on may be adjusted according to the degree of misconvergence.

[0079]

As described above, the deflection yoke of the present invention has the following effects. (1) In the deflection yoke according to the first aspect, by adjusting the variable resistance, misconvergence caused by variations in the vertical deflection magnetic field can be easily corrected, and new misconvergence is generated by the correction operation. Absent. Therefore, simplification of the convergence adjustment and improvement of the quality of the convergence characteristics can be achieved at the same time.

(2) The deflection yoke according to any one of claims 2 to 4,
By adjusting the variable resistance, positive and negative YH misconvergence caused by the vertical deflection magnetic field being too barrel-distorted or pincushion-distorted can be easily corrected, and new misconvergence is generated by the correction operation. There is no. Therefore, simplification of the convergence adjustment and improvement of the quality of the convergence characteristics can be achieved at the same time.

(3) The deflection yoke according to the third aspect is particularly effective when the positive and negative YH misconvergence occurs on average.

(4) The deflection yoke according to the fourth aspect is not limited to the positive / negative YH misconvergence described above, but may be of another type, ie, a positive / negative YH cross-miss which is caused by the center of the vertical deflection magnetic field being shifted in the vertical direction. Convergence can also be corrected. Further, the misconvergence can be corrected separately and independently for the two types of different YH misconvergence and over the entire screen. Therefore, the deflection yoke can be optimally corrected according to the type of the deflection yoke, and a higher quality convergence characteristic can be obtained.

(5) In the deflection yoke according to the fifth aspect, a new misconvergence is slightly generated by the correction operation. However, the amount of the generation is minimized, and the vertical deflection magnetic field is too barrel-distorted or the pincushion is distorted. Positive and negative YH misconvergence caused by excessive distortion can be easily corrected.

(6) The deflection yoke according to the sixth aspect can easily correct the YV misconvergence caused by the rotation and displacement of the vertical deflection magnetic field with little new misconvergence. Further, the one provided with the first and second variable resistors has two types of different YV misconvergence (YV misconvergence caused by rotation and displacement of the vertical deflection magnetic field, and horizontal center of the vertical deflection magnetic field). Since the YV misconvergence caused by the displacement in the direction can be corrected independently and independently, the optimum correction can be made in accordance with each type of misconvergence, and higher quality convergence characteristics can be obtained.

(7) The deflection yoke according to the seventh aspect of the present invention is a VCR which is generated when the vertical deflection magnetic field rotates and shifts.
Misconvergence can be easily corrected with almost no new misconvergence. further,
In the case where the first and second variable resistors are provided, the two types of different VCR misconvergence can be separately and independently corrected, so that the optimum correction can be performed according to each type of misconvergence, and higher quality can be achieved. Convergence characteristics can be obtained.

(8) In the deflection yoke according to claims 8 to 10, by adjusting the variable resistance, positive / negative YH misconvergence caused by the vertical deflection magnetic field being too barrel-distorted or pincushion-distorted can be easily achieved. And no new misconvergence is caused by the correction operation. Therefore, simplification of the convergence adjustment and improvement of the quality of the convergence characteristics can be achieved at the same time. Further, in the deflection yoke according to claims 8 to 10, the increase in the DC resistance due to the addition of the correction circuit can be reduced to about half as compared with the deflection yoke according to claims 1 to 5, and the correction circuit is provided. , The deterioration of the vertical deflection sensitivity can be minimized.

(9) The deflection yoke according to the ninth aspect is particularly effective when the positive and negative YH misconvergence occurs on average.

(10) The deflection yoke according to the tenth aspect,
In addition to the positive / negative YH misconvergence described above, other types, that is, positive / negative YH crossmisconvergence caused by vertical displacement of the center of the vertical deflection magnetic field can be corrected. Further, the correction can be made separately and independently for the two types of different YH misconvergence and over the entire screen. Therefore, this deflection yoke can perform optimal correction according to each type, and can obtain higher quality convergence characteristics.

(11) The deflection yoke according to claim 11 is:
Y generated due to rotation and deviation of the vertical deflection magnetic field
V Misconvergence can be easily corrected without generating new misconvergence. Further, the one provided with the first and second variable resistors has two types of different YV misconvergence (YV misconvergence caused by rotation and displacement of the vertical deflection magnetic field, and horizontal center of the vertical deflection magnetic field). Since the YV misconvergence caused by the displacement in the direction can be corrected independently and independently, the optimum correction can be made in accordance with each type of misconvergence, and higher quality convergence characteristics can be obtained. Further, in the deflection yoke according to the eleventh aspect, the increase in the DC resistance due to the addition of the correction circuit can be reduced to approximately half of that in the deflection yoke according to the sixth aspect, and the vertical deflection sensitivity due to the provision of the correction circuit. Can be minimized.

(12) The deflection yoke according to the twelfth aspect,
V generated due to rotation and deviation of the vertical deflection magnetic field
CR misconvergence can be easily corrected with almost no new misconvergence. Further, the one provided with the first and second variable resistors can separately correct the two types of VCR misconvergence separately and independently, so that the optimum correction can be made in accordance with each type of misconvergence. High quality convergence characteristics can be obtained. Further, the deflection yoke according to the twelfth aspect is capable of reducing an increase in the DC resistance due to the addition of the correction circuit.
The deflection yoke can be reduced to about half as compared with the deflection yoke of the seventh aspect, and the deterioration of the vertical deflection sensitivity due to the provision of the correction circuit can be minimized.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a correction circuit that is a main part of a first embodiment.

FIG. 2 is a diagram illustrating a correction circuit that is a main part of a second embodiment.

FIG. 3 is a diagram illustrating a correction circuit that is a main part of a third embodiment.

FIG. 4 is a diagram showing a correction circuit which is a main part of a fourth embodiment.

FIG. 5 is an operation explanatory diagram of the correction circuit of the first embodiment.

FIG. 6 is an explanatory diagram of a magnetic field generated from a correction coil.

FIG. 7 is a diagram illustrating a deflection yoke correction circuit of the earlier application.

FIG. 8 is an explanatory diagram of a current flowing through a vertical deflection coil.

FIG. 9 is an explanatory diagram of a current flowing through a correction coil.

FIG. 10 is an operation explanatory diagram of the correction circuit in the earlier application.

FIG. 11 is an explanatory diagram of a magnetic field generated from a coma aberration correction coil, which is changed by the correction operation in the earlier application.

FIG. 12 is an explanatory diagram of a reference axis of the deflection yoke.

FIG. 13 is an explanatory diagram of a magnetic field generated from horizontal and vertical deflection coils.

FIG. 14 is an explanatory diagram of a magnetic field generated from a coma aberration correction coil.

FIG. 15 is a diagram showing YH misconvergence and also showing convergence characteristics changed by a correction circuit.

FIG. 16 is an explanatory diagram of misconvergence newly generated by a correction operation.

FIG. 17 is an explanatory diagram of misconvergence that can be corrected in the third embodiment.

FIG. 18 is an explanatory diagram of a magnetic field generated from a correction coil in the fifth and twelfth embodiments.

FIG. 19: YV that can be corrected by the fifth and twelfth embodiments.
It is explanatory drawing of misconvergence.

FIG. 20 is an explanatory diagram of a magnetic field generated from a correction coil in the sixth and thirteenth embodiments.

FIG. 21 is a VC that can be corrected according to the sixth and thirteenth embodiments.
It is explanatory drawing of R misconvergence.

FIG. 22 is a diagram for explaining the principle of the seventh embodiment.

FIG. 23 is an explanatory diagram of a magnetic field generated from a correction coil.

FIG. 24 is an explanatory diagram of a current flowing through a correction coil.

FIG. 25 is a diagram for explaining the principle of the seventh embodiment.

FIG. 26 is a diagram showing a circuit configuration of a seventh embodiment.

FIG. 27 is a diagram showing a circuit configuration of an eighth embodiment.

FIG. 28 is a diagram showing a circuit configuration of a ninth embodiment.

FIG. 29 is a diagram showing a circuit configuration of a tenth embodiment.

FIG. 30 is a diagram showing a circuit configuration of an eleventh embodiment.

[Explanation of symbols]

 D1 to D4 Diode L1, L2 Coma aberration correction coil L3, L4 Correction coil R1, R2 Fixed resistance VR1 Variable resistance d, e Input terminal f, g Output terminal

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-253136 (JP, A) JP-A-1-225045 (JP, A) JP-A-2-194790 (JP, A) JP-A-4-250 14984 (JP, A) JP-A-5-347132 (JP, A) JP-A-6-5229 (JP, A) JP-A-7-212775 (JP, A) JP-A-62-153759 (JP, U) Hikaru Hei 2-129656 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 9/28 H01J 29/76

Claims (12)

(57) [Claims] 1. A self-convergence type deflection yoke comprising at least one pair of saddle type horizontal deflection coils and at least one pair of saddle type vertical deflection coils, wherein at least one of the saddle type vertical deflection coils is provided. In a deflection yoke in which a pair of coma aberration correction coils are connected in series to a pair of saddle type vertical deflection coils, two series-connected resistance elements are connected between input terminals of a diode bridge circuit composed of at least four diodes. Connected, two fixed terminals of the three-terminal variable resistance element are respectively connected to the output terminals of the diode bridge circuit, and between a connection point of the two resistance elements and a movable terminal of the three-terminal variable resistance element, A saddle-shaped vertical connection to which a coma aberration correction coil is connected; Deflection yoke, characterized in that connected in series to at least a pair of saddle type vertical deflection coils of the deflection coil. 2. A self-convergence type deflection yoke comprising at least one pair of saddle type horizontal deflection coils and at least one pair of saddle type or toroidal type vertical deflection coils, wherein at least one of the vertical deflection coils is provided. In a deflection yoke in which at least one pair of coma aberration correction coils are connected in series to one pair of vertical deflection coils, two series-connected resistance elements are connected between input terminals of a diode bridge circuit composed of at least four diodes. And two fixed terminals of the three-terminal variable resistance element are connected to the output terminals of the diode bridge circuit, respectively, between a connection point of the two resistance elements and a movable terminal of the three-terminal variable resistance element. A correction circuit connected to a correction coil for generating a quadrupole magnetic field; While connected in series to at least one pair of the vertical deflection coils of the vertical deflection coils, the quadrupole magnetic field generated from the correction coil has the same poles on the deflection yoke other than on the horizontal axis and the vertical axis. A deflection yoke having a quadrupole magnetic field opposed to each other across an intersection of a horizontal axis and a vertical axis. 3. A deflection yoke according to claim 2, wherein at least one fixed terminal of said three-terminal variable resistance element is connected to an output terminal of said diode bridge circuit via a resistance element. 4. The deflection yoke according to claim 2, wherein two fixed terminals of the second three-terminal variable resistance element are connected to input terminals of the diode bridge circuit, respectively. A deflection yoke, wherein a movable terminal of the variable resistor is connected to a connection point between the movable terminal of the three-terminal variable resistance element and the correction coil for generating the quadrupole magnetic field. 5. A self-convergence type deflection yoke comprising at least one pair of saddle type horizontal deflection coils and at least one pair of saddle type or toroidal type vertical deflection coils, wherein two fixed three-terminal variable resistance elements are provided. The terminal is at least 4
One of the two resistor elements connected in series to the output terminal of the diode bridge circuit consisting of two diodes, and one of the two resistor elements is connected to the diode bridge circuit via one of a pair of coma aberration correction coils. Connected to one input terminal of the circuit, and the other of the two resistance elements is connected to the other input terminal of the diode bridge circuit via the other coil of the pair of coma aberration correction coils. A correction circuit connected between a connection point of the two resistance elements and a movable terminal of the three-terminal variable resistance element, the correction coil generating a quadrupole magnetic field; Are connected in series to at least one pair of vertical deflection coils, and the four-pole magnetic field generated from the correction coil is connected to the same pole except on the horizontal axis and the vertical axis of the deflection yoke. Deflection yoke, characterized in that the quadrupole magnetic field that opposes across the intersection between the horizontal and vertical axes. 6. A deflection yoke according to claim 2, wherein a quadrupole magnetic field generated from said correction coil is:
A deflection yoke having a quadrupole magnetic field symmetrical with respect to a horizontal axis or a vertical axis of the deflection yoke, and having a quadrupole magnetic field having the same polarity on the horizontal axis or the vertical axis. 7. The deflection yoke according to claim 2, wherein the magnetic field generated from the correction coil is not a quadrupole magnetic field, but a barrel-distorted magnetic field symmetrical to the horizontal axis of the deflection yoke. A deflecting yoke characterized by a six-pole magnetic field symmetrical to the horizontal axis. 8. A self-convergence type deflection yoke comprising at least one pair of saddle type horizontal deflection coils and at least one pair of saddle type or toroidal type vertical deflection coils, wherein at least one of the vertical deflection coils is provided. A first diode circuit including two diodes connected in series with the same polarity to each other in a deflection yoke in which at least one pair of coma aberration correction coils are connected in series to a pair of vertical deflection coils; A correction coil for generating a quadrupole magnetic field, comprising: a second diode circuit composed of two diodes connected in series with the same polarity and opposite polarities to the diode circuit; and a resistance circuit composed of two fixed resistance elements connected in series. Connected in parallel to the first and second
The two fixed terminals of the three-terminal variable resistance element are respectively connected between the connection points of the two diodes in the diode circuit, and the movable terminal of the three-terminal variable resistance element is connected to the fixed resistance elements of the resistance circuit. A correction circuit having at least a fixed resistance element connected between the vertical deflection coil and the coma aberration correction coil, wherein a correction circuit having both ends of the impedance circuit as connection points with the outside is connected. And connecting the quadrupole magnetic field generated from the correction coil to the horizontal axis and the vertical axis except for the horizontal and vertical axes of the deflection yoke. A deflection yoke having a quadrupole magnetic field opposed to each other across the intersection of the deflection yoke. 9. The deflection yoke according to claim 8, wherein one of the fixed terminals of the three-terminal variable resistance element and a connection point between two diodes in the first diode circuit.
A deflection yoke, wherein a resistance element is provided at at least one between the other fixed terminal of the three-terminal variable resistance element and a connection point between two diodes in the second diode circuit. 10. The deflection yoke according to claim 8, wherein two fixed terminals of the second three-terminal variable resistance element are connected in parallel to a correction coil, and the second three-terminal variable resistance element is connected to the correction coil. A deflection yoke, wherein a movable terminal is connected to a connection point between the movable terminal of the three-terminal variable resistance element and the impedance circuit. 11. The deflection yoke according to claim 8, wherein the quadrupole magnetic field generated from the correction coil is symmetrical with respect to a horizontal axis or a vertical axis of the deflection yoke.
A deflection yoke having a polar magnetic field and a quadrupole magnetic field having the same polarity on the horizontal axis or the vertical axis. 12. The deflection yoke according to claim 8, wherein a magnetic field generated from the correction coil is set to 4
A deflection yoke, which is not a polar magnetic field but a barrel-distorted magnetic field symmetrical to the horizontal axis of the deflection yoke, or a six-pole magnetic field symmetrical to the horizontal axis.