JPH08256347A - Convergence correction device - Google Patents

Abstract

PURPOSE: To eliminate distortion caused on the screen of a cathode ray tube by arranging a vertical deflection coil modulator coil and a choke coil in parallel and generating sets of magnetic flux in opposite directions to cancel leakage magnetic field. CONSTITUTION: The winding direction is given to vertical deflection coil use modulator coils 11, 14 and a choke coil 13 so as to make the directions of magnetic flux of each coil opposite to each other. Since the magnetic flux generated from the coils 11, 14 flows to the inside of a 1st drum core 19 as shown in the arrow 25 and forms a spatial magnetic path from a 1st plate magnet 18A toward a 2nd plate magnet 18B, then a leakage magnetic flux F1 is produced. Furthermore, a magnetic flux generated by the coil 13 forms a spatial magnetic path from one jaw 24A to other jaw 24B of the drum 24 as shown in the arrow 26, then a leakage magnetic flux F2 is produced. Since the leakage magnetic flux sets F1, F2 are of the same phase and flow in opposite directions, they are cancelled out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection correction device for a cathode ray tube such as a color television receiver or a color display device, and more particularly to a convergence correction device for correcting cross-miss convergence.

[0002]

2. Description of the Related Art A deflection yoke device will be described with reference to FIGS. In general, the deflection yoke device 1 includes a core 2, a horizontal deflection coil 3, a vertical deflection coil 4, and a bobbin 5. The core 2 is formed by joining the semi-annular core member 2A. The horizontal deflection coil 3 is a pair of saddle-shaped top-side horizontal deflection coils 3A and bottom-side horizontal deflection coils 3 arranged on the inner surface side of the core 2.
It consists of B and. The vertical deflection coil 4 is composed of a pair of toroidal vertical deflection coils 4A and 4B wound around the core 2. Further, the bobbin 5 is arranged on the inner surface side of the core 2 to hold the horizontal deflection coil 3, and at the same time, the horizontal deflection coil 3
It is provided to ensure insulation between the vertical deflection coil 4 and the vertical deflection coil 4. The bobbin 5 includes a body portion 5A that expands like a bosh, and a body portion 5
The front end enlarged portion 5B is integrally connected to the front end portion of A, and the rear end enlarged portion 5C is integrally connected to the rear end portion of the body portion 5A. The front end enlarged portion 5B includes the front side of the horizontal deflection coil 3. The crossover portion 3C is accommodated, and the rear end enlargement portion 5C accommodates the rear side crossover portion 3D of the horizontal deflection coil 3.

The deflection yoke device 1 as described above is mounted on a cathode ray tube equipped with a three-row electron gun arranged in a row to radiate a center beam and a side beam passing on the same horizontal plane.
The horizontal deflection coil 3 generates a pincushion-type horizontal deflection magnetic field by supplying a horizontal deflection current, and the vertical deflection coil 4 generates a barrel-shaped vertical deflection magnetic field by supplying a vertical deflection current, so that external circuit correction is performed. It is designed so that the above three electron beams are made to coincide with each other over the entire surface of the cathode ray screen without using any means. However, in such a deflection magnetic field, for example, a horizontal deflection magnetic field, the pin cushion magnetic field becomes stronger as the distance from the central portion of the cathode ray screen increases, so that the three electron beams are made to coincide particularly in the corner portion of the cathode ray screen. Is extremely difficult. For this reason, as shown in FIG. 4, a pair of side beams is easily affected by the magnetic field.
A cross miss convergence may occur between the raster patterns 6B and 6R of the system. This raster pattern
In order to match the deviations of the horizontal deflection magnetic fields 6B and 6R, a convergence correction device 7 that changes the horizontal deflection magnetic field in the vertical deflection current cycle and corrects is generally provided in the rear end enlarged portion 5C of the bobbin 5.

The circuit configuration of the convergence correction device 7 is shown in FIG.

As shown in FIG. 5 (a), horizontal deflection coils 3 arranged on the top side and the bottom side of the deflection yoke device 1.
One ends of A and 3B are commonly connected and connected to a hot side of a horizontal deflection circuit (not shown). Horizontal deflection coils 3A, 3
The other ends of B are connected to one ends of horizontal deflection coil modulator coils 7 and 8. The other ends of the horizontal deflection coil modulator coils 7 and 8 are
It is connected to both ends of the inductance adjusting coil 9, and an intermediate tap portion of the inductance adjusting coil 9 is connected to the cold side. The inductance adjusting coil 9 controls the inductances of the horizontal deflection coil 3A and the horizontal deflection coil modulator coil 7 connected in series, and the horizontal deflection coil 3B and the horizontal deflection coil modulator coil 8 connected in series. It is connected for adjustment, and for example, a differential coil is used.

As shown in FIG. 5B, one end of a vertical deflection coil series circuit composed of a pair of vertical deflection coils 4A and 4B is connected to the hot side of a vertical deflection circuit (not shown).
The other end is connected to a series circuit composed of a resistor 10 and a vertical deflection coil modulator coil 11. Resistor 10
The amount of current flowing through the vertical deflection coil modulator coil 11 is adjusted. In parallel with this series circuit, at the other end of the vertical deflection coil series circuit, two die-ode series circuits consisting of two die-odes 12 having the same forward direction are made to have opposite conduction directions. One end of the diode parallel circuit thus connected in parallel is connected. Also, a series circuit consisting of a choke coil 13 and a vertical deflection coil modulator coil 14 is connected to the other end of the diode parallel circuit, and the vertical deflection coil modulator coil of this series circuit is connected. 1
The fourth side is commonly connected to the vertical deflection coil modulator coil 11, and the common connection end is connected to the cold side.
The choke coil 13 is connected for adjusting the inductance of the vertical deflection coil modulator coil 14. A resistor 1 for current adjustment is provided at both ends of the vertical deflection coil modulator coil 14 and the diode parallel circuit.
5, 16 are connected in parallel, respectively. In addition,
If the voltage across the diode-parallel circuit is less than the forward voltage of the diode, no current will flow in the diode-parallel circuit and the resistance 1
0 and a horizontal deflection coil modulator coil 11 mainly flow in a series circuit. When the voltage value increases, the current is shunted to the diode parallel circuit, and the amount of current flowing to the DC circuit decreases.

Next, the modulator unit 17 composed of each modulator coil constituting the circuit of the convergence correction device 1 will be described with reference to FIG.

The modulator unit 17 is formed by combining the modulator coils 7 and 8 for the horizontal deflection coil, the modulator coils 11 and 14 for the vertical deflection coil, and the magnet 18 as constituent elements. It The vertical deflection coil modulator coils 11 and 14 are wound in two coaxial layers around a first drum core 19 made of a ferrite magnetic material having large-diameter flanges on both ends. Also the drum core 19
The large-diameter flange portion 19A on the left end side of the pair of second drum core 20 and third drum core 2 made of a ferrite magnetic material.
1 are arranged in parallel, and the large-diameter flange portion 1 on the right end side of the drum core 19
A pair of fourth drum core 22 and fifth drum core 23 made of a ferrite magnetic material are arranged in parallel in 9B. Second drum core 20 and third drum core 21
A horizontal deflection coil modulator coil 7 is divided and wound around. The horizontal deflection coil modulator coil 8 is divided and wound around the fourth drum core 22 and the fifth drum core 23. On the outer surface of the outer flange portion of the second drum core 20 and the third drum core 21, and the outer surfaces of the fourth drum core 22 and the fifth drum core 23, there are first elliptical shapes magnetized in the plate thickness direction of the flange portion. The plate magnet 18A and the second plate magnet 18B are attached. With the first plate-shaped magnet 18A and the second plate-shaped magnet 18B, the magnetic bias is uniform in the second drum core 20, the third drum core 21, the fourth drum core 22, and the fifth drum core 23. Given to.

The operation of the modulator unit 17 having such a structure is as follows. The vertical deflection current is generated in the vertical deflection coil modulator coils 11 and 14 by the vertical deflection current. The inductance of each coil wound around the second drum core 20, the third drum core 21, the fourth drum core 22, and the fifth drum core 23 is equal to the magnetic flux generated in each coil,
Modulators for vertical deflection coils Modulators for horizontal deflection coils are changed by the magnetic flux generated in the coils 11, 14 and the magnetic bias given by the first plate magnet 18A and the second plate magnet 18B. −
The inductance of the coils 7 and 8 changes differentially. Therefore, when the amplitude of the current flowing through the horizontal deflection coils 3A and 3B is modulated by the vertical deflection current period and the top side magnetic field has a barrel tendency, the bottom side magnetic field has a pincushion tendency, and conversely the top side has a pin tendency. When there is a cushioning tendency, a magnetic field in which the bottom side has a barreling tendency is obtained, and the cross-miss convergence is corrected.

[0010]

However, since the magnetic circuit of the convergence correction device uses a partial space magnetic path, the leakage magnetic flux generated from the modulator unit affects the horizontal deflection magnetic field and the vertical deflection magnetic field, and the cross magnetic field is affected. Various screen distortions such as the phenomenon that the misconvergence is not corrected sufficiently and remaining, the cathode ray screen is distorted and the raster is distorted into a parallelogram shape, that is, the so-called taore, and the so-called pincushion distortion is distorted. was there.

Therefore, an object of the present invention is to provide a convergence correction device for solving the above problems.

[0012]

In order to achieve the above object, the present invention is configured as follows. That is, the modulator coil for the horizontal deflection coil on the top side connected to the horizontal deflection coil on the top side and the module for the horizontal deflection coil on the bottom side connected to the horizontal deflection coil on the bottom side.
A horizontal deflection side circuit having a vertical coil and a vertical deflection side circuit composed of a choke coil connected to the vertical deflection coil and a vertical deflection coil modulator coil are provided for the vertical deflection coil. A modulator coil and the choke coil for generating a magnetic flux in a direction opposite to the magnetic flux generated by the modulator coil for vertical deflection coil are arranged in parallel, and the modulator coil for vertical deflection coil is provided. The leakage magnetic fields of the choke coils are mutually canceled.

[0013]

Since the modulator unit and the choke coil are arranged in parallel so that the leakage magnetic fields generated from the choke coil are in opposite directions, the modulator coil for the vertical deflection coil constituting the modulator unit is arranged. And the leakage flux of the choke coil are mutually canceled.

[0014]

EXAMPLE FIG. 1 shows an example of the present invention. Since the circuit configuration and operation principle of the convergence correction device are the same, description thereof will be omitted. The same components will be described using the same numbers.

The modulator unit 17 includes drum cores 20 and 21 wound with horizontal deflection coil modulator coils 7 and 8 and drum cores wound with vertical deflection coil modulator coils 11 and 14. 19 and magnet 18
Are formed by combining and as components. The vertical deflection coil modulator coils 11 and 14 are wound in two coaxial layers around a first drum core 19 made of a ferrite magnetic material having large-diameter flanges on both ends. Further, a pair of second drum core 20 and third drum core 21 made of a ferrite magnetic material are arranged in parallel at the left end side large diameter flange portion 19A, and the right end side large diameter flange portion 19B of the drum core 19 is made of ferrite magnetic material. A pair of a fourth drum core 22 and a fifth drum core 23 formed of a body are arranged in parallel. The flat deflection coil modulator coil 7 is separately wound around the second drum core 20 and the third drum core 21. The fourth drum core 22 and the fifth drum core 23 have horizontal deflection coil modulators.
The coil 8 is divided and wound. Second drum core 20
And the third drum core 21 and the fourth drum core 22.
Also, on the outer surface of the outer flange portion of the fifth drum core 23, the same magnetic poles of an oblong first plate magnet 18A and a second plate magnet 18B magnetized in the plate thickness direction of the flange portion are provided. It is attached facing each other. With the first plate-shaped magnet 18A and the second plate-shaped magnet 18B, the magnetic bias is uniform in the second drum core 20, the third drum core 21, the fourth drum core 22, and the fifth drum core 23. Given to.

Modulator coil 1 for vertical deflection coil
The choke coil 13 connected in series to the No. 4 is wound around the sixth drum core 24.

Modulator coil 1 for vertical deflection coil
1, 14 and the choke coil 13 are arranged in parallel so that the central axes of the wound first drum core 19 and sixth drum core 24 are parallel to each other. In addition,
Vertical deflection coil modulator coils 11 and 14,
In order to make the magnetic fluxes generated in the choke coil 13 in opposite directions, the coils are wound in opposite winding directions.

Modulator coil 1 for vertical deflection coil
The magnetic fluxes generated by 1 and 14 flow inside the first drum core 19 and then form a space magnetic path from the first plate magnet 18A to the second plate magnet 18B as shown by an arrow 25. A leakage magnetic flux F1 is generated. Also,
Since the magnetic flux generated by the choke coil 13 flows inside the sixth drum core 24 as shown by an arrow 26, it forms a space magnetic path from one flange portion 24A of the drum core 24 to the other flange portion 24B. Leakage magnetic flux F2 is generated. The leakage magnetic fluxes F1 and F2 from the vertical deflection coil modulator coils 11 and 14 and the choke coil 13 have the same phase, and the flow directions are opposite to each other, so they are mutually canceled.

[0019]

Since the present invention is constructed as described above, it has the following effects. That is, the leakage flux generated by the modulator coil for the vertical deflection coil and the choke
Since the leakage fluxes generated by the coil coil are mutually canceled, the leakage flux generated by the modulator unit is reduced. As a result, the influence of the convergence correction device on the magnetic field generated by the deflection yoke device is reduced, the correction effect of cross-mis-convergence is improved, and further, the distortion generated in the cathode ray screen can be eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement relationship between a modulator unit in which each modulator coil that constitutes a circuit of a convergence correction device according to the present invention and a choke coil are arranged.

FIG. 2 is a front view of a deflection yoke including a convergence correction device.

FIG. 3 is a side view of a deflection yoke including a convergence correction device.

FIG. 4 is a diagram showing cross-miss convergence occurring on a cathode ray screen.

FIG. 5 (a) is a horizontal deflection side circuit diagram including a modulator coil for horizontal deflection coil, and FIG.
FIG. 4 is a vertical deflection side circuit diagram provided with a vertical deflection coil modulator coil.

FIG. 6 is a modulator in which modulator coils forming a circuit of a conventional convergence correction device are integrated.
It is sectional drawing of a unit.

[Explanation of symbols]

 1 Deflection Yoke Device 3 Horizontal Deflection Coil 4 Vertical Deflection Coil 7, 8 Horizontal Deflection Coil Modulator Coil 13 Choke Coil 11, 14 Vertical Deflection Coil Modulator Coil 17 Modulator Unit 18A First Plate magnet 18B Second plate magnet 19 First drum core 20 Second drum core 21 Third drum core 22 Fourth drum core 23 Fifth drum core 24 Sixth drum core F1, F2 Leakage magnetic flux

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Yamazaki 2-10-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A modulator coil for a horizontal deflection coil on the top side, which is connected to a horizontal deflection coil on the top side,
A horizontal deflection side circuit having a bottom side horizontal deflection coil modulator coil connected to the bottom side horizontal deflection coil, and a choke coil connected to the vertical deflection coil and a vertical deflection coil modulator coil. In the convergence correction device provided with a vertical deflection side circuit consisting of
The modulator coil for vertical deflection coil and the choke coil are arranged in parallel, and the magnetic flux generated from the modulator coil for vertical deflection coil and the magnetic flux generated from the choke coil are generated in opposite directions. A convergence correction device characterized in that the leakage magnetic fields of the vertical deflection coil modulator coil and the choke coil are mutually canceled.