JP3430556B2 - Correction device for deflection yoke - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke 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. 3 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. 4 is a structural diagram showing 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. 4, if the direction of the magnetic field is fixed with the vertical deflection current fixed, horizontal deflection is performed between them. 5 and 6, 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. 6). 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 inductance value L of the correction coil 2a will decrease.

According to the same idea, in FIG. 4, 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. 6).

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. 6 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. Inductance value L
Changes. In this way, the inductance value L
Changes, the current flowing there also changes.

FIG. 7 is an explanatory diagram showing the directions of the magnetic field and the force when deflected to the upper right of the screen during misconvergence, and FIG. 8 shows the magnetic field and the force when deflected to the upper right of the screen after being corrected by the deflection yoke correction device. It is explanatory drawing which shows the direction. When the current changes due to the change of the inductance value L as described above, the magnetic field of FIG. 7 changes as shown in FIG.
The misconvergence pattern as shown in FIG. 10 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 of the present invention comprises a first lateral core and a first lateral core.
A first magnetic core formed in a U shape by two lateral cores;
Formed in a U shape by the third lateral core and the fourth lateral core
Second magnetic core and each side of the first magnetic core and the second magnetic core
For correction, a magnet is provided that abuts the end faces of the cores and gives a magnetic bias to each side core, and is arranged on the first side cores.
The coil and the correction coil placed on the fourth lateral core
Connect so that the orientation is reversed, and connect the second side core
And the correction coil placed on the 3rd lateral core
For each side by connecting the coils for magnetic fields so that the directions of the magnetic fields are opposite.
Coil for vertical modulation to cover both core and magnet
Was placed.

Further, the first 'lateral core and the second' lateral core are
A substantially annular first'magnetic core and a third'lateral core connected to each other
A substantially annular second 'magnetic core in which the 4'side core and the 4'side core are connected
When, a pair of magnets providing a magnetic bias to both sandwiched therebetween each <br/> magnetic core of the first 'magnetic core and the second' magnetic core
Provided, first to cover the first 'side core and the second' side core
1'vertical modulation coil is placed and 3'side
The 2'vertical modulation coil covers the core and the 4'side core.
And a first 'lateral core and a second' lateral core.
If a pair of correction coils arranged in
A pair of 3'side core and 4'side core
The correction coil was connected in series.

[0015]

With the above-described structure, the magnetic path through which the magnetic fields of the magnet and the vertical modulation coil pass is a combination of a closed magnetic path and an open magnetic path. This will affect the correction coil.

[0016]

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

(Embodiment 1) FIG. 1 is a structural diagram of a deflection yoke correction device according to a first embodiment of the present invention. In FIG. 1, 6 is a vertical modulation coil. 7 is a magnet. 8 is a magnetic core (book
The first magnetic core of the invention), 9 is the magnetic core (the second magnetic core of the invention).
Qi core). The magnetic cores 8 and 9 are U-shaped, and the end faces of the magnetic cores 8 and 9 are in contact with the magnet 7.

The correction coils 2a and 2c are magnetic coils, respectively.
A Both-side core 8a of 8 (first lateral core of the present invention), both-side core
A 8b (the second lateral core of the present invention) is provided with a correction coil.
Iils 2d and 2b are cores 9a on both sides of the magnetic core 9, respectively.
(Third lateral core of the present invention), both side cores 9b (first of the present invention)
4 lateral cores). The vertical modulation coil 6 is arranged so as to cover both the magnet 7 and both side cores of the magnetic cores 8 and 9.

The magnetic field generated by the N pole of the magnet 7 penetrates the correction coils 2a and 2d, and the magnetic field generated by the S pole of the magnet 7 penetrates the correction coils 2c and 2b.

As described above, in the structure of this embodiment, when the direction of the magnetic field by the correction coil 2a is opposite to the direction of the magnetic field by the magnet 7, the direction of the magnetic field by the correction coil 2b is the direction of the magnetic field by the magnet 7. Is set equal to. Further, when the direction of the magnetic field by the correction coil 2d is opposite to the direction of the magnetic field by the magnet 7, the direction of the magnetic field by the correction coil 2c is set to be the same as the direction of the magnetic field by the magnet 7. When the directions of the currents flowing through the correction coils are reversed, the above relationships are also reversed.

The wirings of the correction coils 2a, 2b, 2c and 2d are connected so that the magnetic fields of the correction coil 2a and the correction coil 2b are reversed, 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. The magnetic bias by the magnet 7 is fixed. When a vertical deflection current is passed through the vertical modulation coil 6, the inductance values L of the correction coil 2a, the correction coil 2b, the correction coil 2c, and the correction coil 2d have the same cycle as the vertical deflection current cycle (vertical cycle). It changes differentially. Therefore, FIG. 5 and FIG.
As shown in (4), the magnetic field of the upper coil 1a and the lower coil 1b of the horizontal deflection coil 1 changes differentially as the inductance value L of each correction coil changes. That is,
When the magnetic field of the upper coil 1a becomes strong, the lower coil 1b
When the magnetic field of 1 becomes weak and the magnetic field of the upper coil 1a becomes weak, the magnetic field of the lower coil 1b becomes strong. Therefore, the magnetic field shown in FIG. 7 changes as shown in FIG.

In the example shown in FIG. 8, 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. Shows the direction of the magnetic field and force of. In this case, a force is applied upward to the B beam and downward to the R beam, so that the misconvergence pattern of FIG.
Can be corrected like.

(Embodiment 2) FIG. 2 is a structural diagram of a deflection yoke correction device according to a second embodiment of the present invention. In FIG. 2, 10a is vertical modulation
Coil (first 'vertical modulation coil of the present invention), 10b
Is a vertical modulation coil (the second 'vertical modulation coil of the present invention).
The vertical modulation coil is thus divided into two. 11 and 12 are magnets.
13 is a magnetic core (the 1'magnetic core of the present invention), and 14 is a magnetic core.
It is an air core (the second 'magnetic core of the present invention), and the deflection yoke correction device of this embodiment is divided into two blocks.

The correction coils 2a and 2b are magnetic coils.
A both side cores 13a of 13 (first 'side core of the present invention),
Located on both side cores 13b (the 2'side core of the present invention)
The correction coils 2c and 2d are
Both-side core 14a (third side core of the present invention), both-side core
14b (the 4'side core of the present invention).
The vertical modulation coil 10a is arranged so as to cover both side cores 13a and 13b of the magnetic core 13, and the vertical modulation coil 10b is disposed to both side cores 14a and 14b of the magnetic core 14.
Are arranged so as to cover together.

The magnetic cores 13 and 14 are both magnets 1.
It is sandwiched between 1 and the magnet 12. Magnet 1
The magnetic field penetrating from the N pole of 1 to the S pole of the magnet 12 penetrates the correction coils 2a and 2b, and from the N pole of the magnet 12
The magnetic field penetrating the S pole of the magnet 11 is the correction coil 2c,
It is arranged so as to penetrate 2d.

The correction coils 2a, 2c, 2b and 2d are connected as shown in FIG. That is, the correction coil 2a and the correction coil 2b on the magnetic core 13 side are connected in series, and the correction coil 2c and the correction coil 2d on the magnetic core 14 side are connected in series.

As described above, in the structure of this embodiment, when the direction of the magnetic field by the correction coil 2a is opposite to the direction of the magnetic field by the magnets 11 and 12, the direction of the magnetic field by the correction coil 2b is set to the magnets 11 and 12. Is set to be equal to the direction of the magnetic field. In addition, the correction coil 2d
When the direction of the magnetic field by the magnets 11 and 12 is opposite to the direction of the magnetic field by the magnets 11 and 12, the direction of the magnetic field by the correction coil 2c is set to be the same as the direction of the magnetic field by the magnets 11 and 12. When the directions of the currents flowing through the correction coils are reversed, the above relationships are also reversed.

The operation will be described below. Magnet 11,
The magnetic bias by 12 is fixed. When a vertical deflection current is passed through the vertical modulation coils 10a and 10b, the correction coil 2a, the correction coil 2b and the correction coil 2c,
The inductance value L of the correction coil 2d changes differentially in the same cycle as the vertical deflection current cycle (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, and when the magnetic field of the upper coil 1a becomes weak, the magnetic field of the lower coil 1b becomes strong. Therefore, as in the previous embodiment, the magnetic field shown in FIG. 7 changes as shown in FIG.
The misconvergence pattern of can be corrected as shown in FIG.

As described above, in the configuration of this embodiment, the magnetic fields of the vertical modulation coils 10a and 10b are corrected coils 2a and 2b.
Modulates by affecting c, 2b, and 2d.

[0031]

As described above, according to the present invention, the magnetic paths through which the magnetic fields of the magnet and the vertical modulation coil pass are a combination of a closed magnetic path and an open magnetic path, and the magnetic fields of the magnet and the vertical modulation coil are efficiently corrected. Affect the coil,
The inductance value L of the correction coil can be reduced. 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 structural diagram of a deflection yoke correction device according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a deflection yoke correction device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing an example of a deflection yoke correction device.

FIG. 4 is a structural diagram of a conventional deflection yoke correction device.

FIG. 5 is an explanatory diagram showing an example of changes in the inductance value of the deflection yoke correction device.

FIG. 6 is an explanatory diagram showing an example of changes in the inductance value of the correction coil of the deflection yoke correction device.

FIG. 7 is an explanatory diagram showing directions of a magnetic field and force when the light is deflected to the upper right of the screen during misconvergence.

FIG. 8 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 a deflection yoke correction device.

FIG. 9: Misconvergence pattern diagram

FIG. 10 is a convergence pattern diagram after correction by the deflection yoke correction device.

[Explanation of symbols]

1a Upper coil 1b lower coil 2a, 2b, 2c, 2d correction coil 6 Vertical modulation coil 7 magnet 8,9 Magnetic core

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 9/28 H01J 29/76

Claims (2)

(57) [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 a color shift of an electron beam on a screen. A correction device for a deflection yoke, which is formed in a U shape by a first side core and a second side core.
The first magnetic core, the third lateral core and the fourth lateral core
A second magnetic core formed in a V shape, and the first magnetic core
The end faces of the side cores of the second magnetic core are in contact with each side.
A magnet that gives a magnetic bias to the core is provided,
Correction coil disposed on the first lateral core and the fourth lateral
The direction of the magnetic field of the correction coil placed in the core is reversed
Connected to each other and arranged on the second lateral core.
Correction coil and correction arranged on the third lateral core
Coils are connected so that the directions of the magnetic fields are reversed, and
A deflection yoke correction device in which a vertical modulation coil is arranged so as to cover both the rectangular core and the magnet . 2. 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 correction device for a deflection yoke, which has a substantially annular shape in which a first 'lateral core and a second' lateral core are connected.
The 1'magnetic core, the 3'side core and the 4'side core
A substantially annular second magnetic core connected to the first magnetic core;
Across both core and the second 'magnetic core providing a magnetic bias to the magnetic core and a pair of magnets, the
The first 'lateral core and the second' lateral core are covered so as to cover the first 'lateral core and the second' lateral core.
The 1'vertical modulation coil is arranged and
2'to cover the 3'side core and the 4'side core
A vertical modulation coil is arranged, and the first side coil
A and a pair of correction coils arranged on the second 'lateral core
Are connected in series with the 3'side core
A pair of correction coils arranged on the 4'side core
A correction device for a deflection yoke, which is connected in series .