JPH06325699A - Correcting device for deflecting yoke - Google Patents

Abstract

PURPOSE:To improve the characteristic of a correcting circuit used for a deflecting yoke. CONSTITUTION:A nearly annular magnetic core 6, which is provided with a central core 7 (7a, 7b) and both side cores, and magnets 4, 5 for giving the magnetic bias to both the side cores of the magnetic core 6 are provided, and a vertical modulating coil 3 is arranged in the central core 7, and correcting coils 2a, 2b, 2c, 2d are arranged in both the side cores respectively. A magnetic path for passing the magnetic field of the magnets 4, 5 and the vertical modulating coil 3 is nearly closed, and the magnetic field of the magnets 4, 5 and the vertical modulating coil 3 give the influence to the correcting coils 2a-2d efficiently, and reduces a L-value of the correcting coils to improve the deflecting sensitivity and reduce the temperature rise (heat generation) and improve the drift of the correction quantity due to the heat generation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke correction device.

[0002]

2. Description of the Related Art In recent years, there has been a deflection yoke which employs a correction device for correcting the deviation of convergence. The configuration of a conventional deflection yoke correction device will be described below.
FIG. 7 is a circuit diagram of a conventional deflection yoke correction device.

Here, 1 is a horizontal deflection coil consisting of an upper coil 1a and a lower coil 1b. Reference numeral 2 denotes a horizontal deflection correction unit including correction coils 2a, 2b, 2c, 2d, and correction coils 2a, 2b among these correction coils are provided.
Is connected in series to the upper coil 1a, and the correction coil 2
c and 2d are connected in series to the lower coil 1b. In the horizontal deflection correction unit 2, 3 is a correction coil 2a, 2
It is a vertical modulation coil for modulating the inductance L of b, 2c and 2d by a vertical deflection current.

FIG. 8 shows a structural diagram of these circuit configurations. 4 and 5 are magnets. Each core wound with the correction coils 2a, 2b, 2c, 2d and the vertical modulation coil 3 is centered on the core of the vertical modulation coil 3, and the cores of the correction coils 2a and 2b and the correction coil are provided at both ends thereof. The cores 2c and 2d are installed so that the directions of the magnetic fields generated by them are opposite. 2 further outside
The magnets 4 and 5 are arranged so that the magnetic field thereof is directed outward or inward, and the correction coil and the vertical modulation coil 3 are sandwiched therebetween.

The operation of the deflection yoke correction device constructed as described above will be described below.

In FIG. 8, if the direction of the magnetic field is fixed with the vertical deflection current fixed, horizontal deflection is performed between them. 9 and 10, the horizontal axis represents the vertical deflection current and the vertical axis represents the inductance value.

From the configuration shown above, the correction coil 2a is pre-biased by the magnetic field of the magnet 4,
The magnetic field of the vertical modulation coil 3 acts on this magnetic bias. Therefore, the inductance value L of the correction coil 2a changes when the magnetic field of the vertical modulation coil 3 is applied (FIG. 10). For example, if the direction of the magnetic field generated by the vertical modulation coil 3 is the same as the direction of the magnetic field generated when a positive current is applied to the correction coil 2a, the correction coil 2a
The inductance value L of is decreased.

In the same way, in FIG. 8, the inductance value L of the correction coil 2b changes when the magnetic field of the vertical modulation coil 3 is applied. However, the magnetic bias by the magnet 4 in the correction coil 2b is
Since the direction is opposite to that of the case a, the inductance value L of the correction coil 2b becomes a value larger than the inductance value L of the correction coil 2a (FIG. 10).

The inductance values L of the correction coils shown in the correction coil 2c and the correction coil 2d are the values shown in FIG. 10 based on the same idea. Therefore, the correction coil 2a and the correction coil 2b are in series with the upper coil 1a, and the correction coil 2c and the correction coil 2d are in series with the lower coil 1b. The inductance value L changes. In this way, since the inductance value L changes in the vertical synchronization, the current flowing there also changes.

FIG. 11 is an explanatory view showing the directions of the magnetic field and the force when deflected to the upper right of the screen during misconvergence.
FIG. 12 is an explanatory diagram showing the directions of the magnetic field and the force when deflected to the upper right of the screen while being corrected by the correction device for the deflection yoke. As described above, when the current changes due to the change of the inductance value L, the magnetic field of FIG. 11 changes as shown in FIG. 12, and the misconvergence pattern as shown in FIG. 13 can be improved as shown in FIG.

[0011]

However, in the above-mentioned conventional structure, the magnetic path through which the magnetic field of the vertical modulation coil and the magnetic field of the magnet pass is an open magnetic path. Therefore, the magnetic field of the vertical modulation coil and the magnetic field of the magnet. Can not affect the correction coil efficiently. Therefore, conventionally, it is necessary to increase the inductance value L of each correction coil or the vertical modulation coil, which causes a decrease in sensitivity, heat generation of the correction coil, and a change in the correction amount due to a change in the inductance value L due to heat generation. Had the problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a correction device for a deflection yoke capable of improving sensitivity and heat generation.

[0013]

In order to achieve this object, a deflection yoke correction device according to the present invention comprises a substantially annular magnetic core having a central core and both side cores, and a magnetic bias applied to both side cores of the magnetic core. And a coil for vertical modulation is arranged in the central core and a coil for correction is arranged in the cores on both sides.

[0014]

With the above configuration, the magnetic paths through which the magnetic fields of the magnet and the vertical modulation coil pass are almost closed, and the magnetic fields of the magnet and the vertical modulation coil affect the correction coil efficiently. Like

[0015]

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

(Embodiment 1) FIG. 1 is a block diagram of a deflection yoke correction device according to a first embodiment of the present invention, and FIG. 2 is an exploded view of the deflection yoke correction device. In FIG. 1, 3 is a vertical modulation coil, 4 and 5 are magnets, and 6 is a magnetic core. The vertical modulation coil 3 is arranged in the central core of the magnetic core 6, and the magnets 4 and 5 are arranged in both cores of the magnetic core 6, respectively. As shown in FIG.
The magnetic core 6 is composed of a pair of E-shaped cores 6a and 6b, and includes a central core 7a and 7b and both side cores 8a and 8b. The end faces of the central cores 7a and 7b are joined inside the vertical modulation coil 3. The cores 8a and 8b on both sides penetrate the coils 2a and 2b for correction, respectively.
The end faces of a and 8b are joined to both end faces of the magnet 4, respectively. The both-side cores 8c and 8d penetrate the correction coils 2c and 2d, respectively, and the end faces of the both-side cores 8c and 8d are joined to both end faces of the magnet 5, respectively.

As described above, in the structure of this embodiment, the correction coils 2a and 2b are arranged on both sides of the magnet 4, and the correction coils 2c and 2d are arranged on both sides of the magnet 5. Then, the magnetic field of the vertical modulation coil 3 forms a closed circuit.

The wirings of the correction coils 2a, 2b, 2c, 2d are connected so that the magnetic fields of the correction coil 2a and the correction coil 2b are opposite to each other, and the correction coil 2c and the correction coil 2d are connected. A similar connection is made for the direction of the magnetic field.

The operation will be described below. Magnet 4, 5
The magnetic bias due to is a fixed state. When a vertical deflection current is passed through the vertical modulation coil 3, the correction coil 2a, the correction coil 2b, the correction coil 2c, and the correction coil 2d
The inductance value L of the differentially changes in the same cycle as the cycle of the vertical deflection current (vertical cycle). By changing the inductance value L of each correction coil in this manner, the magnetic fields of the upper coil 1a and the lower coil 1b of the horizontal deflection coil 1 change differentially. That is, when the magnetic field of the upper coil 1a becomes strong, the magnetic field of the lower coil 1b becomes weak,
When the magnetic field of the upper coil 1a becomes weak, the lower coil 1b
The magnetic field of becomes stronger.

In the example shown in FIG. 12, when the deflection yoke correction device of this embodiment corrects the magnetic field of the upper coil 1a to be weak and the magnetic field of the lower coil 1b to be strong, the deflection is performed to the upper right of the screen. Shows the direction of the magnetic field and force of. In this case, since a force is applied upward to the B beam and downward to the R beam, the misconvergence pattern of FIG. 13 can be corrected as shown in FIG.

(Embodiment 2) FIG. 3 is a block diagram of a deflection yoke correction device according to a second embodiment of the present invention. In FIG. 3, reference numeral 3 is a vertical modulation coil. A magnetic core 9 is composed of a pair of E-shaped cores 9a and 9b. The vertical modulation coil 3 is arranged in the central core of the magnetic core 9. The correction coils 2a and 2c are arranged in the intermediate portions 10 and 11, respectively, and the correction coils 2b and 2d are arranged in the intermediate portions 12 and 13, respectively. Both sides core 14
A gap 16 is formed between a and 14b, and a gap 17 is formed between both side cores 15a and 15b. Then, the magnetic field of the vertical modulation coil 3 forms a closed circuit as shown by the alternate long and short dash lines A and B, and the correction coils 2a and
2c and the correction coils 2b and 2d.

Reference numerals 18, 19, 20, and 21 are magnets, and the magnetic field generated by the magnets 18 and 19 is the correction coil 2.
The magnetic fields generated by the magnets 20 and 21 penetrate through the correction coils 2b and 2d, respectively. Further, the gap 16 and the gap 17 described above act so that the magnetic fields of the magnets 18 and 19 and the magnets 20 and 21 penetrate the correction coils 2a to 2d efficiently.

As described above, in the structure of this embodiment, the magnetic field of the vertical modulation coil 3 influences the correction coils 2a, 2c, 2b and 2d as indicated by the alternate long and short dash lines A and B to perform modulation.

The wiring of each correction coil is the correction coil 2
The magnetic fields of a and the correction coil 2c are connected so that the directions of the magnetic fields are opposite to each other, and the directions of the magnetic fields of the correction coil 2b and the correction coil 2d are also opposite to each other.

The operation will be described below. The magnetic bias by each magnet is fixed. When a vertical deflection current is passed through the vertical modulation coil 3, the inductance values L of the correction coils 2a and 2c and the correction coils 2b and 2d change differentially in the same cycle as the vertical cycle. By changing the inductance value L of each correction coil in this manner, the magnetic fields of the upper coil 1a and the lower coil 1b of the horizontal deflection coil 1 change differentially. That is, the first embodiment
12 is similar to the case of the embodiment of FIG. 12, when a correction magnetic field is applied as shown in FIG. 12, a force is applied upward to the B beam and downward to the R beam, and the misconvergence pattern of FIG. Can be corrected.

(Third Embodiment) FIG. 4 is a block diagram of a deflection yoke correction device according to a third embodiment of the present invention. In FIG. 4, the vertical modulation coil 3 is arranged in the central core of the magnetic core 9 as in the second embodiment. The vertical modulation coil 3 is arranged in the central core of the magnetic core 9 (9a, 9b), and the correction coils 2a, 2b are arranged on both side cores 14 respectively.
a, 14b, and the correction coils 2c, 2d are arranged on both side cores 15a, 15b.

Further, as in the second embodiment, the cores 14 on both sides are formed.
A gap 16 is provided between a and 14b, and both side cores 15 are provided.
A gap 17 is formed between a and 15b. Then, the magnetic field of the vertical modulation coil 3 forms a closed circuit as indicated by the alternate long and short dash lines A and B, and penetrates the correction coils 2a and 2b and the correction coils 2c and 2d. 22,
23, 24, and 25 are magnets, and the magnet 2
The magnetic field generated by the magnets 2 and 23 penetrates the correction coils 2a and 2b, and the magnetic field generated by the magnets 24 and 25 is generated by the correction coil 2a.
It is arranged so as to penetrate c and 2d.

As described above, also in the configuration of this embodiment, the magnetic field of the vertical modulation coil 3 affects the correction coils 2a, 2c, 2b and 2d as indicated by the alternate long and short dash lines A and B, and modulation is performed.

The operation of this embodiment is similar to that of the second embodiment. When a correction magnetic field is applied as shown in FIG. 12, a force is applied upward to the B beam and downward to the R beam. In addition, the misconvergence pattern of FIG. 13 can be corrected as shown in FIG.

(Embodiment 4) FIG. 5 is a block diagram of a deflection yoke correction device according to a fourth embodiment of the present invention. Reference numerals 26 and 27 are magnetic cores, and the deflection yoke correction device of this embodiment is divided into two blocks. The vertical modulation coil is divided into two, one of which is a vertical modulation coil 3a and the other is a vertical modulation coil 3b. The vertical modulation coil 3 a is arranged on the central core 26 a of the magnetic core 26, and the vertical modulation coil 3 b is arranged on the central core 2 of the magnetic core 27.
7a. Further, the correction coils 2a and 2c are arranged on both side cores 26b and 26c of the magnetic core 26, and the correction coils 2b and 2d are respectively provided on the magnetic core 27.
Are disposed on both side cores 27b and 27c. The magnet 28 is sandwiched between the end cores 26 d and 26 e of the magnetic core 26, and the magnet 29 is the end core 27 of the magnetic core 27.
It is sandwiched between d and 27e. Each correction coil 2a,
2c, 2b and 2d are connected as shown in FIG. That is, the correction coil 2 a on the magnetic core 26 side and the magnetic core 27
Side correction coil 2b is connected in series, and the correction coil 2c on the magnetic core 26 side and the correction coil 2 on the magnetic core 27 side are connected.
d are connected in series.

As described above, in the deflection yoke correction device of this embodiment, the magnet 28, the correction coil 2a, the correction coil 2c, and the one vertical modulation coil 3a are arranged in the magnetic core 26, and the magnet 29 and the correction coil are arranged. 2b, the correction coil 2d, and the other vertical modulation coil 3b are arranged on the magnetic core 27.

The operation is almost the same as that of the first embodiment. That is, when a vertical deflection current is passed through the vertical modulation coil 3, the correction coil 2a, the correction coil 2b, and the correction coil 2
c, the inductance value L of the correction coil 2d differentially changes in the same cycle as the vertical cycle, and the inductance value L of each correction coil changes accordingly, whereby the upper coil 1a and the lower coil 1a of the horizontal deflection coil 1 The magnetic field of the coil 1b changes differentially.

(Embodiment 5) FIG. 6 is a block diagram of a deflection yoke correction device in a fifth embodiment of the present invention. Thirty
Reference numerals 31 and 31 are magnetic cores, and this embodiment also has a configuration divided into two blocks. One of the vertical modulation coils 3 a is arranged in the central core 30 a of the magnetic core 30, and the vertical modulation coil 3 b is arranged in the central core 31 a of the magnetic core 31. The correction coils 2a and 2b are arranged on both side cores 30b and 30c of the magnetic core 30, respectively, and the correction coils 2c and 2d are respectively arranged on both side cores 31 of the magnetic core 31.
b, 31c.

The magnet 32 is joined to the protruding core 30d of the magnetic core 30, and the magnet 32 and the central core 3 are joined together.
The end faces of 0a face each other via the gap 34. The magnet 33 is joined to the protruding core 31 d of the magnetic core 31, and the end faces of the magnet 33 and the central core 31 a face each other with a gap 35 in between. Each correction coil 2
a, 2c, 2b and 2d are connected as shown in FIG. The operation is almost the same as that of the first embodiment.

[0035]

As described above, according to the present invention, a substantially annular magnetic core having a central core and both side cores, magnets for applying a magnetic bias to both side cores of the magnetic core are provided, and a vertical modulation coil is provided. By arranging the correction coils in the central core and the both side cores, respectively, the magnetic path through which the magnetic fields of the magnet and the vertical modulation coil pass becomes a closed magnetic path, and the magnetic fields of these magnets and vertical modulation coil are efficiently corrected. It is possible to affect the coil and reduce the inductance value L of the correction coil.
Therefore, the sensitivity of the deflection yoke can be improved, and the heat generation of the correction coil can be improved, so that the change of the inductance value L due to the heat generation can be reduced and the change of the correction amount can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a deflection yoke correction device according to a first embodiment of the present invention.

FIG. 2 is an exploded view of the deflection yoke correction device.

FIG. 3 is a configuration diagram of a deflection yoke correction device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a deflection yoke correction device according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a deflection yoke correction device according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a deflection yoke correction device according to a fifth embodiment of the present invention.

FIG. 7 is a circuit diagram showing an example of a deflection yoke correction device.

FIG. 8 is a block diagram of a conventional deflection yoke correction device.

FIG. 9 is an explanatory diagram showing an example of changes in the inductance value of the deflection yoke correction device.

FIG. 10 is an explanatory diagram showing an example of changes in the inductance value of the correction coil of the deflection yoke correction device.

FIG. 11 is an explanatory diagram showing the directions of the magnetic field and force when deflected to the upper right of the screen during misconvergence.

FIG. 12 is an explanatory diagram showing directions of a magnetic field and a force when deflected to the upper right of the screen while being corrected by the deflection yoke correction device.

FIG. 13: Misconvergence pattern diagram

FIG. 14 is a convergence pattern diagram after correction by the deflection yoke correction device.

[Explanation of symbols]

 1 Horizontal deflection coil 2a, 2b, 2c, 2d Correction coil 3 Vertical modulation coil 4,5 Magnet 6 Magnetic core

Claims (5)

[Claims] 1. A deflection yoke for generating a deflection magnetic field for deflecting an electron beam of a cathode ray tube changes a magnetic field generated in a horizontal deflection coil by a vertical deflection current to reduce color deviation of an electron beam on a screen. A deflection yoke correction device, comprising a substantially annular magnetic core having a central core and two sided cores,
A deflection yoke correction device, comprising: a magnet for applying a magnetic bias to both side cores of the magnetic core; and a vertical modulation coil disposed in the central core and a correction coil disposed in the both side cores. 2. A color deflection of an electron beam on a screen is reduced by changing a magnetic field generated in a horizontal deflection coil by a vertical deflection current in a deflection yoke which generates a deflection magnetic field for deflecting an electron beam of a cathode ray tube. A deflection yoke correction device, comprising: a central core and both side cores; and a substantially annular magnetic core having a gap formed in the both side cores, wherein a vertical modulation coil is arranged in the central core of the magnetic core, A correction device for a deflection yoke, wherein a correction coil is arranged in an intermediate portion between a central core and both side cores of the magnetic core, and a magnet for applying a magnetic bias is provided in the intermediate portion of the magnetic core. 3. A deflection yoke for generating a deflection magnetic field for deflecting an electron beam of a cathode ray tube changes a magnetic field generated in a horizontal deflection coil by a vertical deflection current to reduce a color shift of the electron beam on a screen. A deflection yoke correction device, comprising: a central core and both side cores; and a substantially annular magnetic core having a gap formed in the both side cores, wherein a vertical modulation coil is arranged in the central core of the magnetic core, A correction device for a deflection yoke, wherein correction coils are arranged on both side cores of the magnetic core, and magnets for applying a magnetic bias to the both side cores are provided. 4. A deflection yoke for generating a deflection magnetic field for deflecting an electron beam of a cathode ray tube changes a magnetic field generated in a horizontal deflection coil by a vertical deflection current to reduce color misregistration on the screen of the electron beam. A correction device for a deflection yoke, which has a pair of substantially annular magnetic cores each having a central core with one end open and two sided cores, and a vertical modulation coil is arranged in each central core of each magnetic core. A correction device for a deflection yoke, wherein correction coils are arranged on both side cores of the core, and a magnet for applying a magnetic bias to the both side cores is arranged at a position facing an end surface of the central core. 5. A color deflection of an electron beam on a screen is reduced by changing a magnetic field generated in a horizontal deflection coil by a vertical deflection current in a deflection yoke which generates a deflection magnetic field for deflecting an electron beam of a cathode ray tube. A deflection yoke correction device, comprising a central core and both side cores, and a pair of substantially annular magnetic cores having a gap formed at one end of the central core, wherein each of the magnetic cores has a vertical modulation coil. And a correction coil is arranged on both side cores of each magnetic core, and a magnet for applying a magnetic bias to the both side cores is arranged in the gap.