JPH10283952A - Deflection yoke for in-line type color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke allowing vertical deflection and trilemma to be controlled easily, thus making it possible to obtain a good raster shape and convergence. SOLUTION: This yoke is provided with a correcting coil 20 equipped with both a core 22 having four legs 21A-21D above and below the top of the flange of a coil bobbin 1 and correcting wires 24AT, 24BT, 24CT, 24AB, 24BB, 24CB connected in series with a vertical deflection coil 3 and wound around the core 22 in such a way as to form quadrupole magnetic fields above and below. The upper correcting wires 24AT, 24BT, 24CT are connected in series with the lower correcting wires 24AB, 24BB, 24CB and vertical deflection currents are passed.

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 an in-line type color picture tube used for an in-line type color picture tube in which electron guns are arranged in line, and in particular, can easily control vertical distortion and trilemma. The present invention relates to a deflection yoke for an in-line type color picture tube capable of obtaining a good raster shape and convergence.

[0002]

2. Description of the Related Art Generally, a deflection yoke is mounted on a neck portion of a color picture tube in which three electron guns for emitting red (R), green (G), and blue (B) electron beams are arranged in-line in a horizontal direction. You. The deflection yoke mainly includes a coil bobbin, and horizontal and vertical deflection coils mounted inside and outside the coil bobbin, respectively. A deflection current is supplied to the horizontal deflection coil and the vertical deflection coil, and an electron beam of each color is deflected by using a horizontal deflection magnetic field and a vertical deflection magnetic field generated from each coil.

In this type of deflection yoke, as shown in FIG. 12, a center beam G indicated by a broken line is changed to two side beams R and B indicated by a solid line at upper and lower ends in a Y-axis direction which is a vertical direction of a screen. On the other hand, the sensitivity is insufficient, and a misconvergence (hereinafter, referred to as VCR) occurs in which the center beam G is shifted inward with respect to both side beams R and B. Note that the X axis is the horizontal direction of the screen. Therefore, conventionally, a correction coil is provided on the flange on the neck side of the deflection yoke, and the VCR is corrected by matching the deflection sensitivity of the center beam G with the deflection sensitivity of both side beams R and B. There are mainly two general means for matching the deflection sensitivity of the center beam G and the deflection sensitivities of the two side beams R and B. These will be described as a first conventional example and a second conventional example in order.

<First Conventional Example> FIG. 6 is a plan view of a first conventional example viewed from the neck side, and FIG. 7 is a partially enlarged plan view of FIG. In FIG. 6, a pair of saddle-type horizontal deflection coils (not shown) are mounted inside a coil bobbin 1 formed of an insulating resin material, and a pair of saddle-type vertical deflection coils 3 are mounted outside. I have. A core 4 is mounted outside the pair of saddle type vertical deflection coils 3. A pair of correction coils 5 symmetrically arranged in the X-axis direction with respect to the Y-axis are mounted on the neck-side flange 1F, which is the rear end of the deflection yoke, so as to sandwich the cylindrical portion 1E. .

The correction coil 5 will be further described with reference to FIG. As shown in FIG. 7, the correction coil 5 on the right side in the figure is wound around an E-shaped core 6, coil bobbins 7AR, 7BR, 7CR provided on the core 6, and these coil bobbins 7AR, 7BR, 7CR. Correction winding 8A
R, 8BR, and 8CR. The correction coil 5 on the left side in the figure includes an E-shaped core 6, coil bobbins 7AL, 7BL, 7CL provided on the core 6, and correction windings 8AL, 8BL wound around these coil bobbins 7AL, 7BL, 7CL. , 8CL.

The correction coils 8AR, 8BR, 8CR, 8AL, 8BL,
As shown in FIG. 8, 8CL is connected in series with the vertical deflection coil 3, and the vertical deflection current supplied to the vertical deflection coil 3 corrects the correction windings 8AR, 8BR, 8CR, 8AL, 8B.
L and 8CL are also supplied. Then
A correction magnetic field 9 is generated from the leg of the core 6 of the correction coil 5 as shown in FIG. By this correction magnetic field 9,
Downward forces FR, FB are applied to the side beams R, B.
As a result, the deflection sensitivity of the center beam G and the deflection sensitivity of the two side beams R and B are combined by lowering the deflection sensitivity of the two side beams R and B.
The CR is corrected.

<Second Conventional Example> FIG. 9 is a plan view of a second conventional example viewed from the neck side, and FIG. 10 is a partially enlarged view of FIG. In FIG. 9, the same parts as those in FIG. In FIG. 9, a flange 1F on the neck side of the deflection yoke has a Y
Correction coil 1 arranged symmetrically with respect to the X axis in the axial direction
0 is attached.

The correction coil 10 will be further described with reference to FIG. As shown in FIG. 10, the upper correction coil 10 in the figure includes a U-shaped core 11, a coil bobbin 12T provided on the core 11, and a coil bobbin 12T.
And a correction winding 13T wound around T.
The lower correction coil 10 in the figure includes a U-shaped core 11, a coil bobbin 12B provided on the core 11, and a correction winding 13B wound on the coil bobbin 12B.

The correction windings 13T and 13B of the correction coil 10 configured as described above are, as shown in FIG.
The vertical deflection coil 3 is connected in series with the vertical deflection coil 3.
Is supplied to the correction windings 13T and 13B. Then, the correction coil 1
A correction magnetic field 14 is generated from the legs of the core 11 as shown in FIG. The correction magnetic field 14 applies upward forces FR, FG, and FB to each beam. Force F
Since G is large and the forces FR and FB are small, the deflection sensitivity of the center beam G can be made better than the deflection sensitivity of the side beams R and B, whereby the deflection sensitivity of the center beam G and both side beams R and B can be improved. , The VCR is corrected as a result.

[0010]

In the first prior art, a VCR is corrected by forming a six-pole magnetic field by a pair of correction coils 5 and deteriorating the deflection sensitivity of both side beams R and B. . Therefore, the center of gravity of the vertical deflection magnetic field in the tube axis (Z-axis) direction is in front of the deflection yoke, and the electron beam is affected by the horizontal deflection magnetic field (pin cushion magnetic field) first, and is affected by the vertical deflection magnetic field (barrel magnetic field). Will be received later. As a result, the vertical distortion becomes a pincushion type, and is shown by a solid line as shown in FIG. 13 without misconvergence of the side beams R and B at the left and right ends on the X axis and the upper and lower ends on the Y axis. A horizontal line misconvergence called an inverse trilemma occurs in which the side beam R and the side beam B indicated by a broken line are largely shifted at the four corners of the screen.

In the second conventional example, the VCR is corrected by forming a quadrupole magnetic field by a pair of correction coils 10 and improving the deflection sensitivity of the center beam G. Therefore, the center of gravity of the vertical deflection magnetic field in the Z-axis direction is behind the deflection yoke, and the electron beam is first affected by the vertical deflection magnetic field (barrel magnetic field) and is later affected by the horizontal deflection magnetic field (pin cushion magnetic field). Will be. As a result, the vertical distortion becomes a barrel type, and the left and right ends on the X axis and Y
In a state where there is no misconvergence of the side beams R and B at the upper and lower ends on the axis, as shown in FIG. 14, the side beam R indicated by a solid line and the side beam B indicated by a broken line are displayed on the screen.
Horizontal mis-convergence, called a positive trilemma, occurs at two corners.

As described above, in the conventional deflection yoke, the one using the pair of correction coils 5 can only be in the reverse trilemma state, and the one using the pair of correction coils 10 has the normal trilemma. However, there is a problem that it is difficult to optimize the resulting raster shape and convergence in combination with the horizontal deflection magnetic field generated by the horizontal deflection coil.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a deflection for an in-line type color picture tube in which vertical distortion and trilemma can be easily controlled, thereby obtaining a good raster shape and convergence. The purpose is to provide a yoke.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a coil bobbin (1) mounted on a neck portion of a color picture tube, and mounted on different sides of the coil bobbin. In a deflection yoke for an in-line type color picture tube provided with a horizontal deflection coil (2) and a vertical deflection coil (3), four legs (21A to 21A) are provided above and below the neck side of the coil bobbin.
21D), and correction windings (24AT, 24B) connected in series to the vertical deflection coil and wound around the core so as to generate a quadrupole magnetic field at each of the upper and lower sides.
T, 24CT, 24AB, 24BB, 24CB), and an upper correction winding (24AT, 24BT, 24CT) and a lower correction winding (24AB, 24BB) in the correction winding. , 24CB) are connected in series with each other, and a deflection yoke for an in-line type color picture tube is provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A deflection yoke for an in-line type color picture tube according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of one embodiment of a deflection yoke for an in-line color picture tube according to the present invention as viewed from the neck side, and FIG. 2 is a partially broken view showing one embodiment of a deflection yoke for an in-line color picture tube of the present invention. FIG. 3 is a partially enlarged plan view showing an embodiment of a deflection yoke for an in-line type color picture tube according to the present invention, and FIG. 4 shows a correction magnetic field according to another embodiment of the deflection yoke for an in-line type color picture tube according to the present invention. Figure,
FIG. 5 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil used in a deflection yoke for an in-line type color picture tube according to the present invention. 1 to 3, the same parts as those in FIGS. 6 and 9 are denoted by the same reference numerals.

In FIG. 1 or FIG. 2, a pair of saddle type horizontal deflection coils 2 (shown in FIG. 2) are mounted inside a coil bobbin 1 formed of an insulating resin material.
On the outside, a pair of saddle-type vertical deflection coils 3 are mounted. A core 4 is mounted outside the pair of saddle type vertical deflection coils 3. A pair of correction coils 20 arranged symmetrically with respect to the X-axis in the Y-axis direction are mounted on the flange 1F on the neck side, which is the rear end of the deflection yoke, so as to sandwich the cylindrical portion 1E. . Although not shown here, the pair of correction coils 20 are attached to the flange 1F, for example, by being engaged with claws provided integrally with the flange 1F.

The correction coil 20 will be further described with reference to FIG. As shown in FIG.
Is provided with a core 22 having four legs 21A, 21B, 21C, 21D and an abdomen 21E connecting the legs 21A to 21D. Correction coil 20 arranged on the upper side
The coil bobbin 23BT is attached to the abdomen 21E of the core 22 between the legs 21B and 21C, which are the center portions thereof, and the leg 2 is sandwiched between the coil bobbins 23BT.
Coil bobbin 23 between 1A and 21B, 21C and 21D
AT and 23CT are mounted. Coil bobbin 23A
T, 23BT, and 23CT respectively have a correction winding 24
AT, 24BT, and 24CT are wound.

On the other hand, a coil bobbin 23BB is mounted on the abdomen 21E of the core 22 of the correction coil 20 disposed on the lower side, between the legs 21B and 21C, which are the central portions thereof, so that the coil bobbin 23BB is sandwiched therebetween. 21
Coil bobbin 23A between A and 21B, 21C and 21D
B, 23CB are mounted. Coil bobbin 23A
B, 23BB and 23CB respectively have a correction winding 24
AB, 24BB, and 24CB are wound.

The correction windings 24AT, 24BT, 24CT, 24A in the correction coil 20 configured as described above.
As shown in FIG. 5, B, 24BB, and 24CB are connected in series with the vertical deflection coil 3, and the vertical deflection current supplied to the vertical deflection coil 3 corrects the correction windings 24AT, 24BT, and 2
4CT, 24AB, 24BB, and 24CB are also supplied.

The inner correction winding 24BT and the outer correction windings 24AT and 24CT of the upper correction coil 20 are wound in mutually different directions to generate a quadrupole magnetic field. That is, the correction winding 24BT of the upper correction coil 20 is wound around the coil bobbin 23BT so that a correction magnetic field T1 is generated from the leg 21C toward the leg 21B, and the correction winding 24AT is moved from the leg 21A to the leg. Part 21
B is wound around the coil bobbin 23AT so as to generate a correction magnetic field T2 toward the B. The correction winding 24CT is connected to the leg 21C.
Is wound around the coil bobbin 23CT such that a correction magnetic field T3 is generated from the coil bobbin 23CT toward the leg 21D.

The inner correction winding 24BB and the outer correction windings 24AB, 24C of the lower correction coil 20 are also provided.
B is wound in a direction different from that of B to generate a quadrupole magnetic field. That is, the correction winding 24BB of the lower correction coil 20 is formed by the coil bobbin 23B so that the correction magnetic field B1 is generated from the leg 21C toward the leg 21B.
B, the correction winding 24AB is wound around the coil bobbin 23AB so that a correction magnetic field B2 is generated from the leg 21A toward the leg 21B, and the correction winding 24CB is wound from the leg 21C to the leg 21D. Is wound around the coil bobbin 23CB so that a correction magnetic field B3 is generated toward the coil bobbin 23CB.

Then, the core 22 of the correction coil 20
Correction magnetic fields T1 to T generated from the legs 21A to 21D
3, B1 to B3, an upper force FG is applied to the center beam G, and a downward force FR to the side beams R and B.
FB is added. As a result, the deflection sensitivity of the center beam G and the deflection sensitivity of the side beams R and B are matched by improving the deflection sensitivity of the center beam G and the deflection sensitivity of the side beams R and B. The VCR is comprehensively corrected.

In such a configuration, the correction winding 24BT or 24BB which is an inner winding and the correction winding 24AT, 24CT or 24AB or 24C which is an outer winding.
Since B is connected in series, when the number of turns of the correction winding 24BT or 24BB as the inner winding is increased, the magnetic fields T1 and B1 generated by the correction windings 24BT and 24BB become stronger, and the outer winding is formed. Correction winding 24A
When the number of turns of T, 24CT or 24AB, 24CB is increased, the correction windings 24AT, 24CT, 24A
B, magnetic fields T2, T3, B2 generated by 24CB
B3 can be strengthened. The total correction magnetic field T generated by the upper correction coil 20 is T = T1 +
(T2 + T3), and the total correction magnetic field B generated from the lower correction coil 20 is B = B1 + (B2 + B3).
Becomes

Here, the correction winding 24BT or 24BB, which is the inner winding of the correction coil 20, and the correction windings 24AT, 24CT or 24AB, 24C which are the outer windings.
A specific method of adjusting the turns ratio of B will be described. For example, three correction windings 24AT, 24BT, 24CT or 24 of the correction coil 20 for generating the total correction magnetic fields T and B required to correct the VCR, respectively.
When the total number of turns of AB, 24BB, and 24CB is 60 turns, the number of turns of the correction winding 24BT or 24BB which is the inner winding of the correction coil 20 is 30 turns, and the correction windings 24AT, 24CT or 24A which are the outer windings.
The number of turns of B and 24CB can be set to 15 turns.

In this case, the ratio of the correction magnetic fields of the inner and outer windings of the total correction magnetic field T, B is T1: T2 + T3
= 1: 1. In this state, the vertical distortion is 0, and there is no misconvergence of the side beams R and B at the left and right ends on the X axis and the upper and lower ends on the Y axis.
It is assumed that there is no horizontal misconvergence of the side beams R and B at one corner (hereinafter, trilemma 0).

The number of turns of the correction winding 24BT or 24BB, which is the inner winding of the correction coil 20, is 20 turns.
Correction winding 24AT, 24CT or 2 which is the outer winding
VC even if the number of turns of 4AB, 24CB is set to 20 turns
R can be corrected. In this case, the ratio of the correction magnetic fields of the inner and outer windings of the total correction magnetic field T, B is T
1: T2 + T3 = 1: 2, and the correction amounts of the side beams R and B are larger than those of the center beam G. Therefore,
The center of gravity of the vertical deflection magnetic field in the Z-axis direction moves forward of the deflection yoke, becomes more pincushion-type than when the above-mentioned vertical distortion is zero, and becomes an inverse trilemma.

Further, the number of turns of the correction winding 24BT or 24BB, which is the inner winding of the correction coil 20, is set to 40 turns, and the number of turns of the correction windings 24AT, 24CT or 24AB, 24CB which are the outer windings is set to 10 turns. Can also correct the VCR. In this case, the ratio of the correction magnetic fields of the inner and outer windings of the total correction magnetic fields T and B is T1: T2 + T3 = 2: 1, and the correction amount of the center beam G is larger than that of the side beams R and B. . Therefore, the center of gravity of the vertical deflection magnetic field in the Z-axis direction moves to the rear of the deflection yoke, becomes more barrel-shaped than when the above-mentioned vertical distortion is zero, and becomes a positive trilemma.

In the deflection yoke of the present invention having the correction coil 20 as described above, the correction winding 24 serving as the inner winding is used.
By adjusting the turns ratio between the number of turns of the BT or 24BB and the number of turns of the correction windings 24AT, 24CT or 24AB, 24CB, which are outer windings, the upper and lower sides are each increased by 4 turns.
The pole and total eight-pole magnetic field are appropriately adjusted, whereby the vertical distortion can be made to be either a pincushion type or a barrel type. Along with this, in the deflection yoke of the present invention, the trilemma can be changed to either a reverse trilemma or a normal trilemma.
It can be set arbitrarily. Further, in this case, since the correction directions of the center beam G and the side beams R and B are opposite to each other, the correction amount of the VCR can be larger than that of the second conventional example. Therefore, in the deflection yoke of the present invention, the most optimal state without raster distortion or misconvergence can be easily obtained.

In the embodiment described above, the inner correction winding 24BT and the outer correction windings 24AT and 24CT of the upper correction coil 20 are wound in different directions from each other.
Inner correction winding 24BB in lower correction coil 20
The correction magnetic fields T1 to T3 and B1 to B3 as shown in FIG. 3 are generated by winding the outer and the outer correction windings 24AB and 24CB in mutually different directions. As another embodiment, the inner correction winding 24BT and the outer correction windings 24AT and 24CT in the upper correction coil 20 are used.
Are wound in the same direction as each other, and the lower correction coil 20
Of the inner correction winding 24BB and the outer correction winding 24
AB and 24CB are wound in the same direction, so that the correction magnetic fields T4, T5, B4, B shown in FIG.
5 may be generated.

In this case, the core 22 of the correction coil 20
Magnetic fields T4, T generated from the legs 21A to 21D of the
5, B4 and B5 apply upper forces FG, FR and FB to the center beam G and the side beams R and B. The correction amount of the center beam G is larger than that of the side beams R and B, and the center of gravity of the vertical deflection magnetic field in the Z-axis direction can be moved behind the deflection yoke.

As described above, in the present invention, the correction magnetic field can be arbitrarily changed by appropriately setting the winding direction and the turns ratio of the correction windings 24AT, 24BT, 24CT or 24AB, 24BB, 24CB of the correction coil 20. It is possible to easily obtain the most optimal state without raster distortion or misconvergence. As shown in FIG. 5, the correction windings 24AT, 24BT, 24CT, 2
4AB, 24BB, and 24CB are connected in series as a whole, and there is no need to connect a diode or the like.

In this embodiment, three correction windings are wound around the abdomen 21E of the correction coil 20, respectively, but the present invention is not limited to this. That is, a correction winding may be wound around each of the four legs 21A to 21D of the core 22, and as a result, a correction magnetic field as shown in FIGS. 3 and 4 may be formed. Further, the present invention is not limited to the saddle / saddle type deflection yoke as in this embodiment, but may be a saddle / toroidal type deflection yoke.

[0033]

As described in detail above, the deflection yoke for the in-line type color picture tube of the present invention is provided above and below the neck side of the coil bobbin, and is connected in series with the core having four legs and the vertical deflection coil. And a correction coil having a correction winding wound around the core so as to generate a quadrupole magnetic field at each of the upper and lower sides. Because they were connected in series,
Vertical distortion and trilemma can be easily controlled, and a good raster shape and convergence can be obtained. In addition, since the center beam and both side beams can be independently corrected, VCR can be easily corrected.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of the present invention as viewed from a neck side.

FIG. 2 is a partially broken side view showing one embodiment of the present invention.

FIG. 3 is a partially enlarged plan view showing one embodiment of the present invention.

FIG. 4 is a diagram illustrating a correction magnetic field according to another embodiment of the present invention.

FIG. 5 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil used in the present invention.

FIG. 6 is a plan view showing a first conventional example as viewed from a neck side.

FIG. 7 is a partially enlarged plan view showing a first conventional example.

FIG. 8 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil used in the first conventional example.

FIG. 9 is a plan view showing a second conventional example viewed from the neck side.

FIG. 10 is a partially enlarged plan view showing a second conventional example.

FIG. 11 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil used in a second conventional example.

FIG. 12 is a diagram showing misconvergence called VCR.

FIG. 13 is a diagram showing a state of a reverse trilemma.

FIG. 14 is a diagram showing a state of a normal trilemma.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coil bobbin 1E Cylindrical part 1F Flange 2 Horizontal deflection coil 3 Vertical deflection coil 4,22 core 20 Correction coil 21A-21D Leg 21E Abdomen 23AT, 23BT, 23CT, 23AB, 23BB,
23CB coil bobbin 24AT, 24BT, 24CT, 24AB, 24BB,
24CB correction winding T1-T5, B1-B5 correction magnetic field

Claims (3)

[Claims] 1. A deflection yoke for an in-line color picture tube, comprising: a coil bobbin mounted on a neck portion of a color picture tube; and a horizontal deflection coil and a vertical deflection coil mounted on different sides of the coil bobbin. A core provided on the upper and lower sides of the neck side and having four legs, and a correction winding connected in series to the vertical deflection coil and wound on the core so as to generate a quadrupole magnetic field on each of the upper and lower sides. A deflection yoke for an in-line type color picture tube, characterized in that a correction coil having: is provided, and an upper correction winding and a lower correction winding in the correction winding are connected in series. 2. The correction winding according to claim 1, wherein the magnetic field generated from the four legs of the core is vertically adjacent to a first magnetic field generated between the two inner legs and the outer magnetic legs. 2. A deflection yoke for an in-line type color picture tube according to claim 1, wherein said deflection yoke is wound so as to have a second and a third magnetic field generated between said inner legs. 3. The correction winding according to claim 1, wherein the magnetic field generated from the four legs of the core is formed between a first magnetic field generated between two inner legs and a magnetic field generated between the outer two legs. 2. The deflection yoke for an in-line color picture tube according to claim 1, wherein the deflection yoke is wound so as to generate a second magnetic field.