JP2000323067A - Deflection yoke and color cathode-ray tube television - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence on landing characteristics due to a leakage of a magnetic field in a deflection yoke provided with a device for correcting arcuate mis-convergence and a color cathode-ray tube television using the same. SOLUTION: This deflection yoke comprises two horizontal deflection coils 1, 2 connected in parallel to each other, a first correction coil 3 wound around a first core 5 and connected in series to the horizontal deflection coil 1, a second correction coil 4 wound around a second core 6 juxtaposed with the first core 5 and connected in series to the horizontal deflection coil 2, and a magnet 7 interposed between the first and second cores 5, 6 juxtaposed with each other, for applying bias magnetic fields reverse to each other at the respective ends 5a, 6a of the first and second cores 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube receiver such as a color television receiver or a computer display, and more particularly to a convergence when an electron beam is deflected by a deflection yoke mounted on the color cathode ray tube. The present invention relates to a technique for correcting a deviation of a position.

[0002]

2. Description of the Related Art In a color cathode ray tube receiver, a color image is assembled on a screen by deflecting the traveling directions of three electron beams emitted from an electron gun up, down, left, and right. For deflection of the electron beam, a deflection yoke having a horizontal deflection coil and a vertical deflection coil is used. The deflection yoke is mounted on the main body (glass tube) of the cathode ray tube and deflects three electron beams emitted from the electron gun up, down, left and right by a horizontal deflection magnetic field and a vertical deflection magnetic field.

In such a color cathode ray tube receiver, R
The three electron beams corresponding to the colors (red), G (green), and B (blue) are concentrated (convergence) at one point of a color selection electrode (aperture grill, shadow mask, etc.), so that a desired image is displayed on the screen. Color image is reproduced. However, when a so-called convergence shift (hereinafter, referred to as “misconvergence”) in which the three electron beams are not concentrated on one point of the color selection electrode occurs, this appears as color shift or color unevenness on the screen.

Here, as one form of misconvergence, for example, an in-line color cathode ray tube in which an electron beam for illuminating a green phosphor is used as a center beam, and each electron beam for illuminating red and blue phosphors is used as a side beam. In the receiver, when these three electron beams are deflected in the horizontal direction, an electron beam (hereinafter, referred to as a "red beam") R that illuminates a red phosphor and a blue phosphor illuminate as shown in FIG. Electron beam (hereinafter "blue beam")
Misconvergence (hereinafter referred to as B), which is symmetrically displaced in a state of being curved in an arcuate manner in the vertical direction on the horizontal axis of the screen (hereinafter, referred to as “misconvergence”)
"Bow-shaped miscon").

As a configuration of a deflection yoke provided with a means for correcting the bow-shaped miscon, as shown in FIG.
The correction coils 33 and 34 are wound around the cores 31 and 32, respectively, and the correction coils 33 and 34 are connected in series to two horizontal deflection coils (not shown) connected in parallel, respectively. It is known that a magnet 35 is disposed between two cores 31 and 32 and a bias magnetic field (a magnetic field in the direction of an arrow) is applied to each of the cores 31 and 32.

[0006]

However, in the conventional deflection yoke, the magnetic path formed by the two cores 31 and 32 and the magnet 35 is formed in an open state, and the bias magnetic field generated by the magnet 35 is applied from both ends of the cores 31 and 32. Since the structure always leaks to the periphery, the leaked magnetic field may affect the landing characteristics of the electron beam, leading to mislanding and image distortion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a deflection yoke provided with means for correcting an arcuate miscon and a color cathode ray tube receiver using the same. In order to reduce the influence on the landing characteristics due to the leakage.

[0008]

In a deflection yoke according to the present invention, two horizontal deflection coils connected in parallel and one of the two horizontal deflection coils wound around a first core are provided. And a second correction coil connected in series with the first core and a second core arranged in parallel with the first core, and connected in series to the other of the two horizontal deflection coils. A second correction coil, a magnet arranged between the first and second cores arranged in parallel, and applying a bias magnetic field in opposite directions at one end and the other end of the first and second cores, respectively; Is adopted.

In the deflection yoke having the above structure,
A second core is arranged in parallel, a magnet is arranged between the first and second cores, and a bias magnetic field in opposite directions is applied to one end and the other end of the first and second cores by the magnet. By giving the configuration, the first,
A magnetic path formed by the second core and the magnet therebetween is formed in a closed state (closed magnetic path). Therefore, the bias magnetic field generated by the magnet hardly leaks to the periphery. Also, the direction of the magnetic field generated when a horizontal deflection current flows through the first and second correction coils with respect to the direction of the bias magnetic field generated by the magnet is the same direction in one correction coil and the opposite direction in the other correction coil. By winding the first and second correction coils in such a manner that the horizontal and vertical deflection coils of the two horizontal deflection coils are reversed when scanning the right and left sides of the screen, an arcuate miscon Can be corrected.

[0010]

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

FIG. 1 is a schematic perspective view showing an overall image of a color cathode ray tube according to the present invention. In FIG. 1, the main body (glass tube) of the color cathode ray tube 10 includes a panel section 11, a funnel section 12, and a neck section 13. On the inner surface of the panel section 11, a phosphor screen (not shown) in which red, blue, and green phosphors are arranged in a pattern is formed. On the other hand, an electron gun 14 serving as an emission source of an electron beam is provided in the neck portion 13. A deflection yoke 15 is mounted on a portion (cone portion) from the neck portion 13 to the funnel portion 12. This color cathode ray tube 10
Is mounted in a housing (not shown) together with various accessories necessary for reproducing (displaying) a color image on the phosphor screen on the inner surface of the panel, thereby providing a color cathode ray tube for a color television receiver, a computer display, and the like. A receiver is configured.

FIG. 2 is a view for explaining the configuration of a functional portion for correcting a bow-shaped miscon, particularly in the deflection yoke according to the embodiment of the present invention.

First, in FIG. 2A, two horizontal deflection coils 1 and 2 are connected in parallel. These two horizontal deflection coils 1 and 2 are respectively wound around a deflection yoke perpendicular to the tube axis of the color cathode ray tube in a saddle type (saddle type). Here, one horizontal deflection coil 1 is located above the deflection yoke and the other horizontal deflection coil 2
Are arranged below the deflection yoke.

Of the above two horizontal deflection coils 1 and 2,
One horizontal deflection coil 1 has a first correction coil 3 connected in series, and the other horizontal deflection coil 2 has a second correction coil 4 connected in series. As a result, a horizontal deflection current (sawtooth current) supplied from a horizontal deflection circuit (not shown) is applied to each of the horizontal deflection coils 1 and 2 and the first and second correction coils 3 and 4 connected in series thereto. Will flow.

On the other hand, in FIG. 2B, the first correction coil 3 is wound around the first core 5, and the second correction coil 4 is wound around the second core 6. Collar portions 5a and 5b are integrally formed at both ends of the first core 5, and similarly,
The flanges 6a and 6b are integrally formed at both ends of the core 6 of FIG. The first and second cores 5 and 6 are arranged in parallel with the flanges 5a and 6a at one end and the flanges 5b and 6b at the other end facing each other.

A magnet 7 is disposed between the first and second cores 5 and 6. This magnet 7
Is a permanent magnet whose front and back are magnetized in opposite directions,
The front side is close to (or in contact with) the first core 5 and the back side is the second core.
Are arranged in a state of being close to (or in contact with) the core 6 of the first embodiment. At one end (5a, 6a) of the first and second cores 5, 6, the magnet 7 has an S pole on the first core 5 side and a second
The core 6 side is an N pole, and at the other end (5b, 6b),
The first core 5 is disposed as an N pole, and the second core 6 is disposed as an S pole. Thereby, between the first and second cores 5 and 6, one end (5a, 6a) and the other end (5b, 6)
In b), the bias magnetic field φM of the opposite direction is provided by the magnet 7.

Further, the direction of the bias magnetic field φM applied to the first and second cores 5 and 6 (in the direction of the arrow in the drawing) as described above corresponds to the first and second correction coils 3 and
The direction of the magnetic field generated by the flow of the horizontal deflection current through the first and second correction coils 3 and 4 is the same in one correction coil and the opposite in the other correction coil.
4 is wound around the first and second cores 5 and 6.

Here, the principle of correcting a bow-shaped misconversion using the deflection yoke having the above configuration will be described.

First, in deflecting the electron beam in the horizontal direction, the horizontal deflection current supplied from a horizontal deflection circuit (not shown) is minimized (substantially when the scanning position of the electron beam is located at the center in the horizontal direction of the screen). Zero), and the larger the horizontal deflection current is, the further the horizontal deflection current goes to the left or right side of the screen (the larger the deflection angle becomes).
Supplied to However, when the electron beam scans the left side and the right side of the screen, the horizontal deflection coils 1
The direction of the horizontal deflection current flowing through 2 is reversed.

Therefore, when the electron beam scans the right side of the screen, a horizontal deflection current flows in a certain direction to the first and second correction coils 3 and 4 via the horizontal deflection coils 1 and 2,
As a result, the bias magnetic field φM is applied to the first correction coil 3 side.
And a magnetic field in the same direction as the bias magnetic field φM is generated on the second correction coil 4 side. Then, the magnetic field is weakened on the first correction coil 3 side, and the magnetic field is strengthened on the second correction coil 4 side.

As a result, it becomes difficult for the current to flow through the horizontal deflection coil 1 above the deflection yoke due to an increase in the inductance of the first correction coil 3, and conversely, the current flows through the second horizontal deflection coil 2 below the deflection yoke. The current becomes easier to flow due to the decrease in the inductance of the correction coil 4. As a result, the deflection magnetic field generated by the upper and lower horizontal deflection coils 1 and 2 is increased by the lower horizontal deflection coil 2. Then, as shown in FIG. 3A, the center position of the deflection magnetic field φ by the upper and lower horizontal deflection coils 1 and 2 is shifted upward from the horizontal center axis (x-axis) of the deflection yoke.
As a result, a tilt is generated in the deflection magnetic field φ on the horizontal center axis (x-axis) of the deflection yoke, and the tilt causes magnetic field components H5 and H6 in the direction approaching each other on the x-axis. Then
Due to the magnetic field components H5 and H6, a force for moving the red beam downward and the blue beam B upward is generated.

On the other hand, when the electron beam scans the left side of the screen, the direction of the horizontal deflection current is reversed as described above, so that the direction of the current flowing through the first and second correction coils 3 and 4 is also changed. The first correction coil 3
A magnetic field in the same direction as the bias magnetic field φM is generated on the side, and a magnetic field in a direction opposite to the bias magnetic field φM is generated on the second correction coil 4 side. Then, the first correction coil 3
The magnetic field is strengthened on the side and the magnetic field is weakened on the second correction coil 4 side.

With the same principle as above, the current easily flows through the horizontal deflection coil 1 above the deflection yoke, and the current hardly flows through the horizontal deflection coil 2 below the deflection yoke. As a result, the deflection magnetic field generated by the upper and lower horizontal deflection coils 1 and 2 is increased by the upper horizontal deflection coil 1. Then, as shown in FIG. 3B, the center position of the deflection magnetic field φ by the upper and lower horizontal deflection coils 1 and 2 is deviated below the horizontal center axis (x-axis) of the deflection yoke. . As a result, a tilt occurs in the deflection magnetic field φ on the horizontal center axis (x-axis) of the deflection yoke, and the tilt causes the magnetic field components H7 and H8 to approach each other on the x-axis.
Occurs. Then, the magnetic field components H7 and H8 generate a force for moving the red beam downward and the blue beam B upward.

As described above, when scanning either the left side or the right side of the screen, a force is generated to move the red beam R downward and the blue beam B upward, and the magnitude of the force is determined by the horizontal deflection current (deflection current). By changing according to the size of the angle, the bow-shaped miscon shown in FIG. 5 can be corrected. By the way, the occurrence of bow-shaped miscon
In some cases, the vertical relationship between the red beam R and the blue beam B may be reversed. In such a case, the direction of application of the bias magnetic field (magnetic pole) by the magnet 7 is set to the opposite direction, so that the bow-shaped miscon Can be corrected.

As described above, in the present embodiment, as a configuration of the deflection yoke provided with the means for correcting the bow-shaped miscon, in this embodiment, the magnet 7 is disposed between the first and second cores 5 and 6 arranged in parallel.
And one end (5a, 6a) and the other end (5b, 6b) of the first and second cores 5, 6 by the magnet 7.
Are applied with a bias magnetic field in opposite directions. With this configuration, since the magnetic path formed by the first and second cores 5 and 6 and the magnet 7 therebetween is formed in a closed state (closed magnetic path), the bias magnetic field generated by the magnet 7 does not easily leak to the periphery. As a result, the leakage of the bias magnetic field from the first and second cores 5 and 6 is reduced, so that the influence of the leakage magnetic field on the landing characteristics can be reduced.

Further, since the magnetic field generated by the magnet 7 acts on the first and second cores 5 and 6 without waste, even if a magnet having a weaker magnetic force than the conventional one having an open magnetic path is used. In addition, a bias magnetic field of the same level as in the related art can be applied to the first and second cores 5 and 6.

In the above embodiment, the flanges 5a, 5b, 5b are provided at both ends of the first and second cores 5, 6, respectively.
6a, 6b are provided, and these flange portions 5a, 5b, 6a,
Although the structure in which the magnet 7 is sandwiched by 6b is adopted, the deflection yoke according to the present invention is not limited to this, and various modifications are possible.

Specifically, for example, as shown in FIG. 4A, it is possible to employ a C-shaped core for the first and second cores 5, 6. Further, as shown in FIG. 4B, it is also possible to employ split magnets 7a and 7b. Further, as shown in FIG. 4C, the first and second cores 5, 6
With a C-shaped core and a split magnet 7
It is also possible to employ a and 7b. In addition, FIG.
As shown in (d), it is also possible to adopt an I-shaped core (without collar) for the first and second cores 5 and 6 after employing the split type magnets 7a and 7b.

[0029]

As described above, according to the present invention, there are provided a deflection yoke provided with a means for correcting an arc-shaped miscon and a color cathode ray tube receiver using the deflection yoke.
The magnetic path formed by the core and the magnet between the cores is formed in a closed state (closed magnetic path), which reduces the leakage of the bias magnetic field due to the magnet. Can be prevented from occurring. Further, since the magnetic field generated by the magnet acts on the core without waste, even if a magnet having a lower magnetic force than the conventional one is used, a bias magnetic field at the same level as the conventional one can be applied to the core.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall image of a color cathode ray tube according to the present invention.

FIG. 2 is a diagram illustrating a configuration of a deflection yoke according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining a principle of correcting a bow-shaped misconduct;

FIG. 4 is a diagram illustrating a modified example of the present invention.

FIG. 5 is a view for explaining a bow-shaped miscon;

FIG. 6 is a diagram illustrating a configuration of a conventional deflection yoke.

[Description of Signs] 1, 2,... Horizontal deflection coil, 3,.
2nd correction coil, 5 ... 1st core, 6 ... 2nd core,
7 ... magnet

Claims (2)

[Claims] A first correction coil wound around a first core and connected in series to one of the two horizontal deflection coils; and a first correction coil wound around a first core and connected in series to one of the two horizontal deflection coils. A second correction coil wound around a second core disposed in parallel with the first core, and connected in series to the other of the two horizontal deflection coils; A magnet disposed between the first and second cores and applying a bias magnetic field in opposite directions at one end and the other end of the first and second cores, respectively. yoke. A first correction coil wound around a first core and directly connected to one of the two horizontal deflection coils; and a second correction coil wound around the first core and directly connected to one of the two horizontal deflection coils. A second correction coil wound around a second core arranged in parallel with the first core and directly connected to the other of the two horizontal deflection coils; A deflection yoke, which is disposed between the first and second cores and has magnets for applying reverse bias magnetic fields at one end and the other end of the first and second cores, respectively. A color cathode ray tube receiver characterized by the following.