KR20030022555A - Deflection Yoke for CRT - Google Patents

Abstract

PURPOSE: A deflection yoke for a CRT is provided to easily correct horizontal and vertical asymmetric distortion by attaching a magnet to the separator of the aperture side of the deflection yoke. CONSTITUTION: A CRT comprises an electron gun for emitting red, green and blue electron beams; a phosphor screen where the electron beams emitted from the electron gun produce colors through the impingement against the phosphor screen; and a deflection yoke having horizontal and vertical deflection coils, and a separator for an insulation between the horizontal deflection coil and the vertical deflection coil. The deflection yoke has a magnet(21) attached to the left or right side of the separator of the deflection yoke aperture side in such a manner that the N-pole and S-pole directions of the magnet are parallel to the horizontal axis, thereby correcting the asymmetry of the horizontal distortion. Alternatively, the magnet is attached to the upper or lower side of the separator of the deflection yoke aperture side in such a manner that the N-pole and S-pole directions of the magnet are parallel to the vertical axis, thereby correcting the asymmetry of the vertical distortion.

Description

Deflection yoke for cathode ray tube {Deflection Yoke for CRT}

The present invention relates to a cathode ray tube, and more particularly, to a cathode ray tube deflection yoke in which a magnet is attached to a separator on the deflection yoke opening side.

As shown in FIG. 1, the structure of the cathode ray tube distinguishes the electron gun 4 emitting three R, G, and R electron beams, and the screen 1, in which the electron beam collides to reproduce colors, and the three electron beams. And a shadow yoke (3) for deflecting the shadow beam (2) and the electron beam to a predetermined place of the screen (1).

The deflection yoke 3 has a horizontal deflection coil 31 for deflecting the electron beam emitted from the electron gun 4 in the cathode ray tube in the horizontal direction and a vertical deflection coil for deflecting the electron beam in the vertical direction ( 33) and the conical ferrite core 34 and the horizontal and vertical deflection coils 31 and 33, which are used to reduce the loss of magnetic force generated in the horizontal 31 and vertical deflection coils 33, to increase the magnetic efficiency. And a separator 32 which fixes the ferrite core 34 at a predetermined position and insulates the horizontal deflection coil 31 and the vertical deflection coil 33.

In addition, the neck of the deflection yoke 3 is provided with a convergence yoke 35 and a pair of ring-shaped permanent magnets 36 to correct misconvergence due to manufacturing errors of the deflection yoke 3 and the cathode ray tube. It is attached to the part and used.

The conventional deflection yoke (3) flows a current having a frequency of 15.75KHz or higher to the horizontal deflection coil 31 and deflects the electron beam inside the cathode ray tube in a horizontal direction by using a magnetic field generated accordingly. In addition, the vertical deflection coil 33 is supplied with a current having a frequency of 60 Hz, and the electron beam is deflected in the vertical direction by using a magnetic field generated accordingly.

In addition, the self-convergence of three color electron beams can be achieved on the screen without using additional circuits and additional devices by using non-uniform magnetic fields by the horizontal and vertical deflection coils 31 and 33. Type of deflection yoke 3 is mainly developed. In other words, by adjusting the winding distribution of the horizontal deflection coil 31 and the vertical deflection coil 33 to make a barrel or pin-cushion type magnetic field for each part (opening part, middle part, and neck part), three color electron beams are positioned. In order to experience different deflection forces, each point can be collected at the same point at different distances from the starting point of the electron beam to the screen (1).

In addition, when a current is applied to the horizontal deflection coil 31 and the vertical deflection coil 33 to generate a magnetic field, it is difficult to deflect the front of the screen only by the magnetic field generated by the horizontal deflection coil 31 and the vertical deflection coil 33. By using a ferrite core 34 of magnetic permeability, the magnetic field is increased by increasing the efficiency of the magnetic field by minimizing the loss on the return path of the magnetic field.

In addition, iron is applied to the neck flange 38 of the separator 32 when correcting the left and right or up and down asymmetrical distortion generated during the manufacture of the horizontal deflection coil 31 and the vertical deflection coil 33 of the deflection yoke 3. Insertion or a cushion was inserted between the separator 32 and the ferrite core 34 to correct the magnetic field of the deflection yoke.

However, the above method has a problem that adversely affects the other convergence of the screen and the amount of correction is insufficient.

Accordingly, an object of the present invention is to solve a conventional problem, and attach a magnet for asymmetrical correction of horizontal distortion to the left or right side of the separator of the deflection yoke opening so that the NS direction is parallel to the horizontal axis, and above the separator of the deflection yoke opening or By attaching the vertical asymmetry correction magnet of vertical distortion to the lower side so that the NS direction is parallel to the vertical axis, the purpose is to improve the left and right or vertical asymmetry distortion, which is a kind of misconvergence on the screen.

1 is a schematic diagram of a cathode ray tube.

2 and 3 are views showing left and right asymmetrical distortion screens, respectively.

4 is a front view of a deflection yoke with a magnet attached to the left side of the separator according to the present invention;

5 is a diagram illustrating a screen before and after the left and right asymmetrical distortion is corrected.

FIG. 6 is a diagram illustrating a screen before and after asymmetric distortion is corrected and a screen after correction; FIG.

7 and 8 are views illustrating a screen that is distorted up and down asymmetrically.

9 is a front view of a deflection yoke with a magnet attached to an upper side of a separator according to the present invention;

Explanation of symbols on the main parts of the drawings

1: screen 3: deflection yoke

7: Screen pattern 31: Horizontal deflection coil

32: Separator 33: Vertical deflection coil

34: Ferrite core 35: Convergence York

38: neck flange 39: deflection yoke opening

The present invention for achieving the object as described above, the electron gun to emit an electron beam of three colors R (Red), G (Green), B (Blue), and the electron beam emitted from the electron gun hit the fluorescent surface to reproduce the color A cathode ray tube comprising a screen and a deflection yoke having a horizontal, vertical deflection coil and a separator for insulating between the horizontal deflection coil and the vertical deflection coil, the magnet on the left or right side of the separator at the deflection yoke opening side. Attached to the NS direction parallel to the horizontal axis, characterized in that for correcting the left and right asymmetry of the horizontal distortion.

Another technical solution of the present invention includes an electron gun emitting electron beams of three colors of R (Red), G (Green), and B (Blue), a screen on which the electron beam emitted from the electron gun hits a fluorescent surface to reproduce color, A cathode ray tube comprising a deflection yoke having a horizontal and vertical deflection coil and a separator for insulating between the horizontal deflection coil and the vertical deflection coil, wherein a magnet is attached to the upper or lower separator of the deflection yoke opening. It is characterized by correcting the vertical asymmetry of the vertical distortion by attaching the direction parallel to the vertical axis.

Hereinafter, with reference to the accompanying drawings, the present invention to achieve the above object will be described in detail.

The present invention is for correcting the left and right or up and down asymmetrical distortion generated during the manufacture of the horizontal deflection coil 31 and the vertical deflection coil 33 of the deflection yoke 3.

Conventionally, a magnetic plate is inserted into the neck flange 38 or a cushion is inserted between the separator 32 and the ferrite core 34 to correct the magnetic field shape.

However, the conventional left and right or up and down asymmetrical distortion correction methods adversely affect convergence and have insufficient correction amount.

Therefore, in order to overcome the above problem, the present invention attaches a magnet 21 for correcting the left and right asymmetry of the horizontal distortion on the left or right side of the separator 32 at the opening of the deflection yoke 3 when the horizontal distortion is asymmetric. And, the NS direction of the magnet 21 is to be parallel to the horizontal axis direction.

In addition, when the vertical distortion of the vertical distortion occurs, a magnet 24 for correcting the vertical asymmetry of the vertical distortion is attached to the separator 32 above or below the opening of the deflection yoke 3, and the NS of the magnet 24 is attached. Make the direction parallel to the vertical axis and direction.

2 and 3 illustrate screen patterns generated by left and right asymmetry of horizontal distortion.

As shown in FIG. 4, when the screen pattern 7 having the asymmetrical asymmetry occurs as described above, the left and right sides of the separator 32 on the opening side of the deflection yoke 3 are shown to correct the asymmetry of the horizontal distortion. A magnet 21 is attached to correct the left and right asymmetry of the horizontal distortion.

The NS direction of the magnet 21 attached to the separator 32 is parallel to the horizontal axis direction.

Then, the magnet 21 has a magnetic force line 22 extending from the N pole to the S pole, and the electron beams of three colors R, G, and B receive the force 23 in the direction acting between the two poles. As shown in Fig. 5, the left and right asymmetrical pictures are shifted and corrected.

7 and 8 illustrate a screen pattern 7 generated by vertical distortion of vertical distortion.

As described above, in order to correct the vertical asymmetry of the vertical distortion when a vertically asymmetric screen pattern occurs, as shown in FIG. 9, the vertical distortion is above or below the separator 32 on the opening side of the deflection yoke 3. Attach the magnet 24 to correct the vertical asymmetry of.

The NS direction of the magnet 24 attached to the separator 32 is parallel to the vertical axis direction.

Then, the magnet 24 generates a line of magnetic force 25 extending from the N pole to the S pole, and the electron beams of three colors R, G, and B receive the force 23 in the direction acting between the two poles. As shown in Fig. 9, the up and down asymmetrical screen is shifted and corrected.

Therefore, according to the present invention, when correcting the left and right asymmetrical distortion, a magnet having an appropriate amount of Gaussian value is attached to the left or right side of the separator at the deflection yoke opening side, or to the upper side or the lower side, so that the right and left sides cannot be corrected by the conventional method. And it is effective to increase the productivity by easily correcting the vertical asymmetric distortion.

Claims (2)

Electron guns emitting electron beams of three colors (R (Red), G (Green), B (Blue)), a screen in which the electron beam emitted from the electron gun strikes a fluorescent surface to reproduce color, and a horizontal, vertical deflection coil and the horizontal deflection In the cathode ray tube comprising a deflection yoke having a separator that serves to insulate the coil and the vertical deflection coil, And a magnet attached to the separator left or right side of the deflection yoke opening side, the NS direction being parallel to the horizontal axis, thereby correcting left and right asymmetry of the horizontal distortion. Electron guns emitting electron beams of three colors (R (Red), G (Green), B (Blue)), a screen in which the electron beam emitted from the electron gun strikes a fluorescent surface to reproduce color, and a horizontal, vertical deflection coil and the horizontal deflection In the cathode ray tube comprising a deflection yoke having a separator that serves to insulate the coil and the vertical deflection coil, And a magnet attached to the separator upper or lower side of the deflection yoke opening side, the NS direction being parallel to the vertical axis to correct the vertical asymmetry of the vertical distortion.