JP2000324507A - Deflection yoke and color cathode-ray tube receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of correcting coils of the deflection yoke equipped with a means which corrects X-axial longitudinal misconvergence (cross misconvergence and arcuate misconvergence). SOLUTION: The deflection yoke is equipped with a 1st correcting coil unit which has two horizontal deflection coils 1 and 2 connected in parallel and one XCV (cross misconvergence) correcting coil 3 connected in series with the horizontal deflection coil 1 and a 2nd correcting coil unit which has one XBV (arcuate misconvergence) correcting coil connected in series with the horizontal deflection coil 2. The 1st correcting coil unit has the XCV correcting coil 3 wound around one side of a bobbin 6 and varies the inductance of the XCV correcting coil 3 by moving a core 5 axially in the bobbin 6. The 2nd correcting coil unit has the XBV correcting coil 4 wound around a drum core 7 and applies a bias magnetic field to the drum core 7 by a magnet 8.

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 for emitting a red phosphor and an electron beam (hereinafter, referred to as “red beam”) for emitting a blue phosphor. There is a misconvergence (hereinafter, referred to as “X-axis vertical misconvergence”) in which the blue beam B) shifts vertically on the horizontal axis of the screen.

[0005] The X-axis vertical misconvergence includes:
As shown in FIG. 5A, misconvergence in which the red beam R and the blue beam B are asymmetrically shifted in a state of crossing on the horizontal axis of the screen (hereinafter, referred to as “cross misscon”);
As shown in FIG. 5B, there is a misconvergence in which the red beam R and the blue beam B are symmetrically displaced in a state of being curved in an arcuate shape on the horizontal axis of the screen (hereinafter, referred to as “arc-shaped misconversion”).

[0006] Then, these cross microcomputers (hereinafter referred to as "cross microcomputers")
"XCV" and bow-shaped miscon (hereinafter "XB
V ”), a pair of XCs is provided for two horizontal deflection coils 31 and 32 connected in parallel as shown in FIG. 6A.
V correction coils 33 and 34 and a pair of XBV correction coils 3
5 and 36 are connected in series.

More specifically, a pair of XCV correction coils 33 and 34 are wound around both sides of a bobbin 38 into which a screw-shaped core 37 is inserted, as shown in FIG. By moving the core 37 in the axial direction inside the bobbin 38, the XCV correction coils 33 and 34 are moved.
Can be varied. On the other hand, the pair of XBV correction coils 35 and 36 are as shown in FIG.
A pair of drum cores 39 arranged in series as shown in FIG.
40 is wound around each. A magnet 41 is arranged between the pair of drum cores 39 and 40, and a bias magnetic field is applied to each of the drum cores 39 and 40 by the magnet 41.

[0008]

However, in the above-mentioned conventional deflection yoke, two horizontal deflection coils 31,
32, two correction coils are connected respectively,
As a result, a total of four correction coils (33, 34, 3)
5, 36) is used to correct X-axis vertical misconvergence (cross miscon, bow miscon).
As a whole, the circuit configuration becomes complicated due to the large number of coils,
In terms of size, it was disadvantageous in terms of cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a deflection yoke provided with a means for correcting an X-axis vertical misconvergence (cross miscon, arcuate miscon) and a deflection yoke having the same. An object of the present invention is to reduce the number of correction coils in the used color cathode ray tube receiver.

[0010]

In the deflection yoke according to the present invention, two horizontal deflection coils connected in parallel and one first deflection coil connected in series to one of the two horizontal deflection coils are provided. A first correction coil unit having one correction coil and a means for varying the inductance of the first correction coil, and one second correction coil connected in series to the other of the two horizontal deflection coils; And a second correction coil unit having a core on which the second correction coil is wound and a means for applying a bias magnetic field to the core.

In the deflection yoke having the above structure, the cross miscon is corrected by the first correction coil unit having one first correction coil connected in series to one horizontal deflection coil, and the other horizontal deflection coil is corrected. An arcuate miscon is corrected by a second correction coil unit having one second correction coil connected in series to the coil. This makes it possible to correct X-axis vertical misconvergence (cross misscon, bow-shaped miscon) by using a total of two correction coils.

[0012]

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 part for correcting a vertical misconvergence in X-axis (cross miscon, bow-shaped miscon) as a deflection yoke according to an 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 two horizontal deflection coils 1 and 2,
One XCV correction coil (first correction coil) 3 is connected in series to one horizontal deflection coil 1, and one XBV correction coil (second correction coil) 4 is connected in series to the other horizontal deflection coil 2. It is connected to the. As a result, a horizontal deflection current (sawtooth current) supplied from a horizontal deflection circuit (not shown) flows through each of the horizontal deflection coils 1 and 2 and the correction coils 3 and 4 connected in series.

As shown in FIG. 2B, the XCV correction coil 3 is wound around one side of a bobbin 6 into which a screw-type core 5 is inserted. In the bobbin 6, the core 5 is supported so as to be movable and adjustable in the axial direction (the direction of the arrow in the drawing). A rotary knob 6a is provided at an intermediate portion of the bobbin 6 in the axial direction. The inner peripheral portion of the rotary knob 6a is engaged with the outer peripheral portion (thread) of the core 5, and by rotating the rotary knob 6a, the core 5 moves in the axial direction. Then, by adjusting the position of the core 5 by turning the rotary knob 6a with respect to the winding position of the XCV correction coil 3 on the bobbin 6, the inductance of the XCV correction coil 3 can be varied. The above XCV correction coil 3,
The core 5 and the bobbin 6 constitute a first correction coil unit in the present invention.

On the other hand, the XBV correction coil 4 is shown in FIG.
As shown in the figure, the drum is wound around a drum core 7 having flange portions 7a and 7b at both ends. A magnet 8 is arranged near the drum core 7. The magnet 8 has an S pole at one end approaching (or abutting) one flange 7a of the drum core 7 and an N pole at the other end approaching (or abutting) the other collar 7b of the drum core 7. It is arranged in a state. Thus, a bias magnetic field is applied to the drum core 7 in a direction from the flange portion 7b toward the flange portion 7a. The magnet 8 is supported so as to be rotatable in the direction of the arrow in the figure, and has a structure in which the direction of the bias magnetic field (the position of the magnetic pole) applied to the drum core 7 can be changed. The XBV correction coil 4, the drum core 7, and the magnet 8 constitute a second correction coil unit according to the present invention.

Here, X using the deflection yoke having the above-described configuration is used.
The principle of correcting the axial vertical misconvergence (cross miscon, bow miscon) will be described.

First, in correcting the cross mismatch, the first correction coil unit is used. In the first correction coil unit, the XCV
The correction coil 3 is wound around the bobbin 6, and the bobbin 6
The core 5 is inserted so as to be movable. And
By moving the core 5 in the axial direction by turning the rotary knob 6a of the bobbin 6, the inductance of the XCV correction coil 3 changes. At this time, if the XBV deflection coil 4 is regarded as a fixed inductance, the horizontal deflection current flowing through the horizontal deflection coil 1 above the deflection yoke changes according to the inductance of the XCV correction coil 3.

Therefore, by changing the inductance of the XCV correction coil 3 based on the inductance of the XBV deflection coil 4, it is possible to change the balance (strength relationship) of the deflection magnetic field by the upper and lower horizontal deflection coils 1 and 2. it can. That is, if the inductance of the XCV correction coil 3 is made larger than that of the XBV deflection coil 4, more horizontal deflection current flows through the lower horizontal deflection coil 2, so that the lower deflection magnetic field can be strengthened accordingly. it can. Conversely, if the inductance of the XCV correction coil 3 is made smaller than that of the XBV deflection coil 4, more horizontal deflection current flows through the upper horizontal deflection coil 1, so that the upper deflection magnetic field can be strengthened accordingly. .

Thus, when the electron beam scans the left side of the screen, the inductance (XCV correction coil 3) of the XCV correction coil 3 is set so that the deflection magnetic field generated by the upper horizontal deflection coil 1 becomes weaker than that of the lower horizontal deflection coil 2. Core 5 position)
Is adjusted, the center position of the deflection magnetic field φ by the upper and lower horizontal deflection coils 1 and 2 is adjusted as shown in FIG.
The deflection yoke is displaced upward from the horizontal center axis (x-axis). As a result, the deflection magnetic field φ is inclined on the horizontal center axis (x axis) of the deflection yoke, and the inclination causes magnetic field components H1 and H2 in the direction approaching each other on the x axis. Then, due to the magnetic field components H1 and H2, a force is generated that moves the red beam R downward and the blue beam B upward.

On the other hand, when the electron beam scans the left side of the screen, the direction of the horizontal deflection current flowing through the horizontal deflection coils 1 and 2 is reversed, and accordingly the direction of the deflection magnetic field is also reversed. That is, when scanning the right side of the screen, the direction of the deflection magnetic field φ is upward as shown in FIG. 3A, but when scanning the left side of the screen, FIG.
The direction of the deflection magnetic field φ is downward as shown in FIG.
However, since the balance of the deflection magnetic field by the upper and lower horizontal deflection coils 1 and 2 is maintained as it is together with the inductance of the XCV correction coil 3, the center position of the deflection magnetic field φ by the upper and lower horizontal deflection coils 1 and 2 is The deflection yoke is displaced upward from the horizontal center axis (x-axis). 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 H3 and H4 in the direction separated from each other on the x-axis. Then, the magnetic field components H3 and H4 generate a force for moving the red beam R upward and the blue beam B downward.

As described above, when the left side of the screen is scanned, a force for moving the red beam R to the lower side and the blue beam B to the upper side is generated. A force for moving B downward is generated, and the magnitude of each force changes in accordance with the magnitude of the horizontal deflection current (deflection angle), so that the cross microcomputer shown in FIG. It becomes possible to correct. Incidentally, as a form of occurrence of the cross miss-con, the vertical relationship between the red beam R and the blue beam B in FIG. 5A may be reversed, but in this case, the magnetic field generated by the upper horizontal deflection coil 1 becomes lower. By adjusting the inductance of the XCV correction coil 3 so that it becomes stronger than the magnetic field generated by the horizontal deflection coil 2, cross misscon can be corrected based on the same principle as described above.

On the other hand, the second correction coil unit is used for correcting the bow-shaped misconduct. In this second correction coil unit, since the XBV correction coil 4 is wound around the drum core 7 biased by the magnet 8 as described above, the inductance of the XBV correction coil 4 ,
Direction, etc.). At this time, if the XCV deflection coil 3 is regarded as a fixed inductance, the horizontal deflection current flowing through the horizontal deflection coil 2 below the deflection yoke is XBV
It will change according to the inductance of the correction coil 4.

Here, when a current flows through the XBV correction coil 4, a magnetic field is generated in the drum core 7 according to the direction of the current. If the direction of the magnetic field generated at this time is the same as the direction of the bias magnetic field generated by the magnet 8, the magnetic field of the drum core 7 is strengthened by the addition thereof, and if the direction is opposite, the magnetic field of the drum core 7 is reduced by the subtraction. Is weakened. Further, when the magnetic field of the drum core 7 is strengthened, the current easily flows through the horizontal deflection coil 2 below the deflection yoke due to the decrease in the inductance of the XBV correction coil 4, so that the deflection magnetic field by the horizontal deflection coil 2 is strengthened accordingly. Will be done.

Thus, when the electron beam scans the right side of the screen, the direction of the magnetic field generated when a horizontal deflection current flows through the XBV correction coil 4 is the same as the direction of the bias magnetic field generated by the magnet 8. By setting the direction of the magnet 8 (the direction in which the bias magnetic field is applied to the drum core 7) in advance, the deflection magnetic field generated by the lower horizontal deflection coil 2 becomes stronger than the deflection magnetic field generated by the upper horizontal deflection coil 1. Then, as shown in FIG. 4A, the center position of the deflection magnetic field φ generated by the upper and lower horizontal deflection coils 1 and 2 is deviated upward from the horizontal center axis (x-axis) of the deflection yoke. This causes a tilt in the deflection magnetic field φ on the horizontal center axis (x-axis) of the deflection yoke, and the tilt causes a magnetic field component H5 in the direction approaching each other on the x-axis.
, H6. Then, due to the magnetic field components H5 and H6, a force is generated that moves the red beam R downward and the blue beam B upward.

On the other hand, when the electron beam scans the left side of the screen, the direction of the horizontal deflection current flowing through the XBV correction coil 4 is reversed, and the direction of the magnetic field generated in the drum core 7 by this current flow is the bias magnetic field. In the opposite direction. As a result, the deflection magnetic field generated by the lower horizontal deflection coil 2 becomes weaker than the deflection magnetic field generated by the upper horizontal deflection coil 1 as shown in FIG. Has a shape deviated below the horizontal center axis (x-axis) of the deflection yoke. Thereby, the horizontal center axis (x axis) of the deflection yoke
Above, the deflection magnetic field φ is inclined, and the inclination causes magnetic field components H7 and H8 in the direction approaching each other on the x-axis.
Then, the magnetic field components H7 and H8 generate a force for moving the red beam R 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 for moving the red beam R downward and the blue beam B upward is generated, and the magnitude of the force is determined by the horizontal deflection current ( By changing according to the magnitude of the deflection angle, the bow-shaped miscon shown in FIG. 5B can be corrected. Incidentally, as a form of occurrence of the bow-shaped miscon, the vertical relationship between the red beam R and the blue beam B in FIG. 5B may be reversed.
By setting the direction (magnetic pole) of applying the bias magnetic field in the opposite direction, the bow-shaped miscon can be corrected based on the same principle as described above.

As described above, according to the deflection yoke according to the present embodiment, the two horizontal deflection coils 1 and 2 connected in parallel
A first correction coil unit in which one XCV correction coil 3 is connected in series to the upper horizontal deflection coil 1;
The second correction coil unit in which one XBV correction coil 4 is connected in series to the lower horizontal deflection coil 2 can correct both the cross miscon and the bow miscon. As a result, the number of correction coils in the deflection yoke provided with the means for correcting X-axis vertical misconvergence (cross miscon, arcuate miscon) and the color cathode ray tube receiver using the same can be reduced to half that in the related art.

In the related art, a pair of drum cores and a magnetic path formed by a magnet between the pair of drum cores are formed in an open state, so that a bias magnetic field generated by the magnet is easily leaked to the periphery. The magnetic path formed by the magnet 7 and the magnet 8 is formed in a closed state (closed magnetic path), so that the bias magnetic field generated by the magnet 8 does not easily leak to the periphery. This allows
The influence of the leakage magnetic field on the landing characteristics of the electron beam can be reduced, and the occurrence of mislanding and image distortion can be effectively prevented.

In the above embodiment, of the two upper and lower horizontal deflection coils 1 and 2 connected in parallel, the XCV correction coil 3 is connected to the upper horizontal deflection coil 1 and the lower horizontal deflection coil 2 is connected. The XBV correction coil 4 is connected to the upper horizontal deflection coil 1, but the XBV correction coil 4 is connected to the upper horizontal deflection coil 1, and the XCV correction coil 3 is connected to the lower horizontal deflection coil 2. It may be.

[0033]

As described above, according to the present invention, X
In a deflection yoke provided with means for correcting axial longitudinal misconvergence (cross misscon, arcuate miscon) and a color cathode ray tube receiver using the same, one first correction coil connected in series to one horizontal deflection coil And a second correction coil unit having one second correction coil connected in series to the other horizontal deflection coil.
Since the correction coil unit can correct both the cross miss-con and the arc-shaped miss-con, the number of the correction coils can be reduced to half of the conventional one. This makes it possible to simplify the circuit configuration, reduce the number of parts, reduce the size, reduce the cost, and the like.

[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 cross miss control.

FIG. 4 is a view for explaining a principle of correcting a bow-shaped miscon;

FIG. 5 is a view for explaining X-axis vertical misconvergence (cross miscon, bow-shaped miscon).

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

[Explanation of symbols]

1, 2 ... horizontal deflection coil, 3 ... XCV correction coil, 4 ...
XBV correction coil, 5: core, 6: bobbin, 6a: rotary knob, 7: drum core, 8: magnet

Claims (2)

[Claims] A first correction coil connected in series to one of the two horizontal deflection coils; and an inductance of the first correction coil connected to one of the two horizontal deflection coils. A first correction coil unit having variable means, one second correction coil connected in series to the other of the two horizontal deflection coils, and a core wound with the second correction coil. And a means for applying a bias magnetic field to the core. 2. Two horizontal deflection coils connected in parallel; one first correction coil connected in series to one of the two horizontal deflection coils; and an inductance of the first correction coil. A first correction coil unit having variable means, one second correction coil connected in series to the other of the two horizontal deflection coils, and a core wound with the second correction coil. And a second correction coil unit having means for applying a bias magnetic field to the core.