JPH08287846A - Deflection yoke device - Google Patents

Abstract

PURPOSE: To correct VCR and YHTilt by arranging corrective coils above and below a neck part of a cathode-ray tube, and changing the ratio of corrective magnetic fields generated from these respective corrective coils. CONSTITUTION: An upper inside winding part 24 and an upper outside winding part 25 are wound round a U-shaped core 22 of a corrective coil 21 positioned on the upper side through a coil bobbin 23, and a lower inside winding part 29 and a lower outside winding part 30 are also wound round a core 27 of a corrective coil 26 positioned in a lower part. A value of an electric current flowing in the upper inside winding part 24 and the lower outside winding part 30 and a value of an electric current flowing in the lower inside winding part 29 and the upper outside winding part 25 are adjusted. Therefore, a variation in the ratio of corrective magnetic fields generated from the corrective coils 21 and 26 can be expanded, and miss convergence by VCR and YHTilt can be corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device mounted on a color picture tube such as a color television receiver or a color display device.

[0002]

2. Description of the Related Art Generally, a deflection yoke device is provided with a coil bobbin mounted on a neck portion of a color picture tube and a magnetic field for deflecting an electron beam output from the neck portion of the color picture tube. And a horizontal deflection coil and a vertical deflection coil.

The deflection yoke device is a neck of a color picture tube in which three electron guns for outputting red (R), green (G), and blue (B) electron beams are horizontally arranged inline. The horizontal deflection magnetic field is supplied to the horizontal deflection coil and the vertical deflection current is supplied to the vertical deflection coil. The electron beams of each color are deflected.

However, in such a structure, the G electron beam located in the center at the upper and lower points on the Y axis lacks sensitivity to the R and blue electron beams located on both sides, Misconvergence (Vertical Center Rast) in which the G electron beam deviates from the R and B electron beams
er) (hereinafter referred to as VCR) (see FIG. 7).

Therefore, correction coils for respectively correcting the horizontal deflection magnetic field generated by the horizontal deflection coil and the vertical deflection magnetic field generated by the vertical deflection coil are provided above and below the neck portion of the coil bobbin, and the deflection sensitivity of the central electron beam of G is deflected. To
There is also known a deflection yoke device in which the above-mentioned misconvergence is corrected by increasing the deflection sensitivity of the R and B electron beams located on both sides.

A deflection yoke device equipped with a correction coil according to the prior art will be described with reference to FIGS.

In the drawing, reference numeral 1 denotes a deflection yoke device, which has a bobbin 2 made of an insulating resin material in the shape of a bosh, and the coil bobbin 2 has a peripheral body portion 2A which expands in a bosh shape. A front end enlarged portion 2B that expands in a brim shape on the front end side of the peripheral body portion 2A, a rear end enlarged portion 2C that expands in a brim shape on the rear end side of the peripheral body portion 2A, and a rear end of the rear end enlarged portion 2C. A pair of tightening portions 2D and a coil attaching portion 2E, which is provided on the rear surface side of the rear end enlarged portion 2C so as to project upward and downward so as to face each other, and to which correction coils 6 and 6 to be described later are attached,
2E, ...

Here, a pair of saddle type horizontal deflection coils (not shown) are provided on the inner peripheral side of the coil bobbin 2, and a pair of toroidal type coils wound around the core 3 are provided on the outer peripheral side of the coil bobbin 2. Vertical deflection coils 4 and 4 are provided.
The deflection yoke device 1 is mounted on the neck portion 5 of the picture tube in which the three electron guns R, G and B are arranged inline, and is fixed by tightening the tightening portion 2D with a tightening ring or the like.

Reference numerals 6 and 6 are rear end enlarged portions 2C of the coil bobbin 2.
The correction coils attached to the respective coil attachment portions 2E located on the upper and lower sides of the rear surface are shown.
The G and B electron beams are arranged vertically so as to be positioned on both sides in the direction orthogonal to the in-line arrangement.

Here, each of the correction coils 6 has a leg portion 7
A and 7A are arranged in such a manner that the U-shaped core 7 is arranged so as to face the neck portion 5 of the color picture tube, the correction coil bobbin 8 provided in the central portion of the core 7, and the coil bobbin 8 has a winding wire. , The correction winding portion 9 wound with, for example, 8 turns, and each of the correction coils 6 includes a coil mounting portion 2E.
It is designed to be attached by being inserted from the outside in the radial direction.

In the correction coil 6 thus constructed,
As shown in FIG. 6, the correction winding portions 9 and 9 are connected in series with the vertical deflection coils 4 and 4.

In FIG. 6, reference numerals 10 and 10 denote resistors connected in parallel with the vertical deflection coils 4 and 4, respectively.
Is provided as a shunt resistor, an adjusting resistor 11 is connected between the resistors 10, an intermediate tap of the adjusting resistor 11 is connected to a connection point of the vertical deflection coils 4, and the adjusting resistor 11 is changed. The intensity of the vertical deflection magnetic field generated from each vertical deflection coil 4 is adjusted by adjusting the value of the current flowing through the vertical deflection coils 4 and 4 located above and below.

Reference numeral 12 denotes an adjustment resistor connected in parallel with the correction winding unit 9, 9 and an intermediate tap of the adjustment resistor 12 is connected to a connection point of each correction winding unit 9 to change the adjustment resistor 12. By doing so, the value of the current flowing through the upper and lower correction winding portions 9, 9 is adjusted, and the strength of the correction magnetic field generated from each correction coil 6 is adjusted.

By supplying the vertical deflection current to the vertical deflection coils 4 and 4 and the correction winding portions 9 and 9 in this way, the correction magnetic field F (see FIG. 4) occurs, and the VCR is corrected.

Further, in the correction coils 6 and 6, FIG.
As shown in, the misconvergence (Y-axis Hol) in which B is inclined with respect to R and G in the vertical direction at the upper and lower points on the Y axis.
izontal Tilt) (hereinafter referred to as YH Tilt) can also be corrected by changing the adjustment resistance 12 shown in FIG. 6 to change the balance of the correction magnetic fields by the correction coils 6 located above and below. I am adjusting.

For example, if the adjustment resistor 12 is adjusted to increase the current value flowing through the upper correction winding portion 9 by 2 turns and decrease the current value flowing through the lower correction winding portion 9 by 2 turns, The ratio of the correction magnetic fields by the upper and lower correction coils 6 and 6 can be adjusted to 10: 6.

[0017]

By the way, in the above-described deflection yoke device according to the prior art, although the correction coils 6 and 6 can correct both the misconvergence of VCR and YH Tilt, the correction amount of YHTilt is equal to each correction coil. 6 is proportional to the correction magnetic field of 6, so that if the correction amount is adjusted according to the distortion of the VCR, the correction amount of YH Tilt becomes insufficient. For example, as described above, the ratio of the correction magnetic fields of the upper and lower correction coils 6 and 6 is large. However, there is a problem that the correction can be performed only up to 10: 6, and the correction that satisfies both can not be performed at the same time.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a deflection yoke device capable of widening the variation width of the ratio of the correction magnetic field generated by each correction coil. I am trying.

[0019]

A deflection yoke device according to the present invention includes a coil bobbin mounted on a neck portion of a color picture tube, and an electron beam output from the neck portion of the color picture tube provided on the coil bobbin. It is composed of a horizontal deflection coil and a vertical deflection coil which generate a deflecting magnetic field, and a pair of correction coils which are provided at upper and lower positions on the neck side of the coil bobbin and are connected to the vertical deflection coil.

In order to solve the above-mentioned problems,
A feature of the invention according to claim 1 is that the correction coil on the upper side is formed by winding an upper inner winding portion and an upper outer winding portion around a U-shaped core having a pair of legs, and a lower side correction coil is formed. The correction coil is formed by winding a lower inner winding part and a lower outer winding part around a U-shaped core having a pair of legs, and one of the cores is formed by the inner winding part of each correction coil. A correction magnetic field is generated from the leg portion to the other leg portion, and a correction magnetic field is generated from the other leg portion of the core to the one leg portion by the outer winding portion of each correction coil. There is something I did.

According to a second aspect of the present invention, each of the correction coils is
The inner winding part and the outer winding part wound around the core are wound in different directions.

According to a third aspect of the present invention, each winding portion of each of the correction coils constitutes one series circuit by the upper inner winding portion and the lower outer winding portion, and the lower inner winding portion and the upper outer winding portion are formed. The other part of the series circuit is constituted by the line portion, each series circuit is connected in series with the vertical deflection coil, and the current value flowing through each series circuit is adjusted.

[0023]

According to the invention of claim 1, the upper side correction coil and the lower side correction coil have different correction magnetic fields generated from the respective leg portions of the core by the inner winding portion and the outer winding portion. As a result, a comprehensive correction magnetic field can be set by the correction magnetic field generated by the inner winding part and the correction magnetic field generated by the outer winding part. The change width of the ratio due to the comprehensive correction magnetic field generated from the correction coil can be expanded.

According to the second aspect of the present invention, the upper inner winding portion and the upper outer winding portion are wound around the core of the upper correction coil, and the lower inner winding portion is wound around the core of the lower correction coil. Since the winding directions of the wire portion and the lower outer winding portion are different from each other on the inside and the outside of each core, the direction of the correction magnetic field generated between one leg portion and the other leg portion of the core is changed. It can be generated so as to face each other.

According to a third aspect of the present invention, in each of the winding parts in the upper and lower correction coils, the upper inner winding part and the lower outer winding part form one series circuit, and the lower inner winding part and the upper part By using the outer winding part as another series circuit and adjusting the current value flowing through each series circuit, it is possible to widen the variation range of the ratio due to the correction magnetic fields generated from the correction coils located above and below.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes an upper correction coil according to the present embodiment which is located on the upper side of the rear surface of the coil bobbin 2 at the rear end enlarged portion 2C. Is attached to each coil attachment portion 2E.

Here, the upper correction coil 21 has a U-shaped core 22 arranged so that the leg portions 22A and 22B face each other with the side surface of the neck portion 5 of the color picture tube interposed therebetween.
Correction coil bobbin 2 provided in the central portion of the core 22.
3 and an upper inner winding portion 24 and an upper outer winding portion 25 in which windings are coaxially wound around the coil bobbin 23.

The upper inner winding portion 24 has one winding direction on the outer circumference of the coil bobbin 23 so that a correction magnetic field in the direction of the arrow FT1 is generated from one leg portion 22A to the other leg portion 22B. It is wound around. On the other hand, the upper outer winding portion 25 has another winding around the outer periphery of the upper inner winding portion 24 so that the correction magnetic field in the direction of the arrow FT2 is generated from the other leg portion 22B toward the one leg portion 22A. It is wound in the direction.

Reference numeral 26 is a lower correction coil located on the lower side of the rear surface side of the rear end enlarged portion 2C of the coil bobbin 2 so as to face the upper correction coil 21, and the lower correction coil 26 is similar to the above-mentioned correction coil 21. , A U-shaped core 27 in which leg portions 27A and 27B are erected, a correction coil bobbin 28 provided in the central portion of the core 27, and the coil bobbin 2
8 is composed of a lower inner winding portion 29 and a lower outer winding portion 30 in which the winding is coaxially wound.

Further, the lower inner winding portion 29 is arranged in one winding direction on the outer circumference of the coil bobbin 28 so that a correction magnetic field in the direction of the arrow FB1 is generated from one leg portion 27A to the other leg portion 27B. It is wound. On the other hand, the lower outer winding portion 30
Is wound around the outer circumference of the lower inner winding portion 29 in the other winding direction so that a correction magnetic field in the direction of the arrow FB2 is generated from the other leg portion 27B toward the one leg portion 27A.

Next, referring to FIG. 2, the winding portion 24,
The connection between 25, 29, 30 and the vertical deflection coils 4, 4 will be described.

In the figure, 31 is one series circuit composed of an upper inner winding part 24 and a lower outer winding part 30, and 32 is another series circuit composed of a lower inner winding part 29 and an upper outer winding part 25. Circuits are respectively shown. The adjustment resistors 12 are connected in parallel to the series circuits 31 and 32, the connection point of the series circuits 31 and 32 is connected to the intermediate tap of the adjustment resistors 12, and the resistance of the adjustment resistors 12 is shown. By adjusting the value, the series circuit 3
The value of the current flowing through 1, 32 can be adjusted.

That is, when the value of the current flowing through the series circuit 31 is increased, the magnetic field FT1 generated by the upper inner winding portion 24 and the magnetic field FB2 generated by the lower outer winding portion 30 become stronger, and the current value flowing through the series circuit 32 is increased. When is increased, the magnetic field FB1 generated by the lower inner winding portion 29 and the magnetic field FT2 generated by the upper outer winding portion 25 can be increased.

The total correction magnetic field FT generated from the correction coil 21 located on the upper side is FT = FT1-FT2, and the total correction magnetic field TB generated from the correction coil 26 located on the lower side is TB = FB1−FB2.

Next, a specific adjusting method for adjusting the correction coils 21 and 26 will be described.

For example, in order to correct the misconvergence of the VCR, the comprehensive correction magnetic fields FT and FB required.
When the number of turns of the correction coils 21 and 26 for generating is 8 turns, the upper inner winding portion 24 and the lower inner winding portion 29 are 10 turns, and the upper outer winding portion 25 and the lower outer winding portion 30 are It can be set as 2 turns.

In this case, the VCR is generated by the total correction magnetic fields FT and FB generated from the correction coils 21 and 26.
Although the misconvergence can be corrected, if the YH Tilt cannot be corrected completely, the adjustment resistor 12 is changed to make an adjustment.

For example, the adjustment resistor 12 is adjusted to increase the current value in one series circuit 31 by 2 turns and decrease the current value in the other series circuit 32 by 2 turns, so that the upper correction coil 21 is apparently turned on. The inner winding portion 24 of the lower correction coil 26 has 12 turns, the outer winding portion 25 has 0 turns, the inner winding portion 29 of the lower correction coil 26 has 8 turns, and the outer winding portion 30 has 4 turns.
The turned correction magnetic fields FT1, FT2, FB1, FB2 are generated. As a result, the total correction magnetic field ratio of the upper correction coil 21 and the lower correction coil 26 becomes 12: 4.

Here, as described in the prior art, even if the current value is similarly changed in the conventional correction coils 6 and 6, the ratio of the correction magnetic field by each correction coil 6 is 10: 6.
It's nothing but.

Therefore, in the present embodiment, the adjustment resistor 12 adjusts the value of the current flowing through the series circuits 31 and 32 to increase the variation width of the ratio of the correction magnetic fields FT and FB generated from the correction coils 21 and 26. Therefore, it is possible to supplement the correction amount necessary for the correction of YH Tilt, which cannot be corrected in the conventional technique, and it is possible to perform the correction of YH Tilt.

Thus, in the deflection yoke device according to the present embodiment, the upper inside winding portion 24 is provided to the core 22 via the coil bobbin 23 so that the correction magnetic field FT1 is generated from the leg portion 22A of the core 22 of the upper correction coil 21. Wrap the legs 2
The upper outer winding portion 25 is wound around the upper inner winding portion 24 so that the correction magnetic field FT2 is generated from 2B. on the other hand,
The coil bobbin 2 is attached to the core 27 of the lower correction coil 26 so that the correction magnetic field FB1 is generated from the leg portion 27A of the core 27.
The lower outer winding portion 3 is wound around the lower inner winding portion 29 so that the correction magnetic field FB2 is generated from the leg portion 27B.
Wind 0.

In this state, the upper inner winding portion 24 and the lower outer winding portion 30 are connected in series to form one series circuit 31, and the lower inner winding portion 29 and the upper outer winding portion 25 are connected. Are connected in series to be connected to another series circuit 32, and the current value flowing through the series circuits 31 and 32 is changed by the adjusting resistor 12. As a result, it is possible to widen the change width depending on the ratio of the correction magnetic fields FT and FB generated from the upper correction coil 21 and the lower correction coil 26, and not only the correction of misconvergence by VCR but also the correction amount of misconvergence by YH Tilt. Can be large.

As a result, the VCR and YH Tilt on the screen can be adjusted by appropriately adjusting the resistance value of the adjusting resistor 12.
The mis-convergence due to can be corrected reliably, and the image can be displayed neatly.

In the above embodiment, the upper inner winding portion 2
4 and the upper outer winding portion 25, and the lower inner winding portion 29 and the lower outer winding portion 30 have different winding directions.
The present invention is not limited to this, and the correction magnetic fields FT1 and FT2 generated from the inner winding portion 24 (29) and the outer winding portion 25 (30).
It suffices that (FB1 and FB2) face each other, the winding directions are the same, and the direction of current flow is set to the inner winding portion 24 (2
9) and the outer winding portion 25 (30) may be opposed to each other on the circuit.

[0046]

As described above in detail, according to the present invention of claim 1, the upper correction coil and the lower correction coil are
In both cases, the correction magnetic fields generated from the legs of the core are made different by the inner winding part and the outer winding part,
A total correction magnetic field is set by the correction magnetic field generated by the inner winding part and the correction magnetic field generated by the outer winding part, and by changing the individual correction magnetic fields generated from each leg, the upper and lower It is possible to widen the range of change due to the ratio of the correction magnetic field generated from each correction coil located in the position, increase the correction amount of misconvergence by YH Tilt, adjust the misconvergence by VCR, and also adjust the misconvergence by YH Tilt. You can

According to the second aspect of the present invention, the upper inner winding portion and the upper outer winding portion are wound around the core of the upper correction coil, and the lower inner winding portion and the lower portion are wound around the core of the lower correction coil. Since the winding direction in the outer winding portion is different in the inside and the outside of each core, the directions of the correction magnetic fields generated between the one leg portion and the other leg portion of the core should be opposite to each other. It can be generated, and the total correction magnetic field can be set by the difference between the correction magnetic fields.

According to the third aspect of the present invention, in each of the winding parts of the upper and lower correction coils, the upper inner winding part and the lower outer winding part form one series circuit, and the lower inner winding part and the upper outer winding part are formed. A correction magnetic field generated from the correction coils positioned above and below by connecting the line portion to another series circuit as a series circuit and connecting the series circuits to the vertical deflection coil in series and adjusting the current value flowing through each series circuit. It is possible to widen the variation range by the ratio of YH Tilt, expand the misconvergence correction amount by YH Tilt, adjust the misconvergence by VCR, and then adjust the misconvergence by YH Tilt.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a state where a correction coil is attached to a neck portion according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil according to an embodiment.

FIG. 3 is a rear side view of a deflection yoke device according to the related art.

FIG. 4 is an enlarged view of a main part of FIG. 3;

5 is a perspective view of a main part of FIG.

FIG. 6 is a circuit diagram showing a connection relationship between a correction coil and a vertical deflection coil according to a conventional technique.

FIG. 7 is an explanatory diagram showing misconvergence due to a VCR occurring on a screen.

FIG. 8 is an explanatory diagram showing misconvergence due to YH Tilt generated on the screen.

[Explanation of symbols]

 2 coil bobbin 2E coil mounting part 4 vertical deflection coil 5 neck part 12 adjustment resistor 21 upper correction coil (correction coil) 22,27 core 22A, 22B, 27A, 27B leg 24 upper inner winding part 25 upper outer winding part 26 Lower correction coil (correction coil) 29 Lower inner winding portion 30 Lower outer winding portion 31 One series circuit 32 Other series circuit

Claims (3)

[Claims] 1. A coil bobbin mounted on a neck portion of a color picture tube, and a horizontal deflection coil and a vertical deflection coil which are provided on the coil bobbin and generate a magnetic field for deflecting an electron beam output from the neck portion of the color picture tube. In a deflection yoke device comprising a coil and a pair of correction coils provided at upper and lower positions on the neck portion side of the coil bobbin and connected to a vertical deflection coil, the upper correction coil has a pair of legs. It is formed by winding an upper inner winding portion and an upper outer winding portion on a U-shaped core having the correction coil on the lower side and a lower inner winding portion on the U-shaped core having a pair of legs. It is formed by winding a lower outer winding portion, and a correction magnetic field is generated from one leg portion of the core to the other leg portion by the inner winding portion of each correction coil. The deflection yoke device is characterized in that the correction winding magnetic field is generated from the other leg portion of the core toward the one leg portion by the outer winding portion of each correction coil. 2. The deflection yoke device according to claim 1, wherein in each of the correction coils, an inner winding portion and an outer winding portion wound around a core have winding directions different from each other. 3. Each winding part of each correction coil constitutes one series circuit with an upper inner winding part and a lower outer winding part, and another series circuit with a lower inner winding part and an upper outer winding part. The deflection yoke device according to claim 1 or 2, wherein the series circuit is formed by connecting each series circuit in series with the vertical deflection coil and adjusting a current value flowing through each series circuit.