KR0138572B1 - Misconvergence supporting apparatus - Google Patents

Abstract

The misconvergence correction window has the same size and shape as the misconvergence generated on the left and right sides of the screen to correct misconvergence caused by the deflection of the red beam on the right side of the screen and the blue beam on the left side of the screen. Is applied to the center of the screen, and then the misalignment generated on the left and right sides and the center of the screen is simultaneously corrected by using the vertical deflection magnetic field generated by the vertical deflection coil. In order to prevent mutual interference between and the correction magnetic field generated at the lower side and to generate each correction magnetic field sufficiently, the magnetic field generated at the lower comapricoil is canceled in the upper deflection, and the upper comapricoil in the lower deflection. Upper comapricoil and lower Each phase is connected in series to the coma-free coils, mutually parallel arrangement to the lower drum core and the compensation coil, and the magnetized surface is facing the respective drum cores was equipped with a magnetic material between each drum core. This can be used for all deflection yokes, and is particularly useful for deflection yokes in which misconvergence is generated in which red and blue beams are scanned alternately on the left and right sides of the screen.

Description

Miss Convergence Corrector

1 is an exploded perspective view of a general deflection yoke.

2 is a screen characteristic diagram in which misconvergence has occurred.

3 is a plan view of a deflection yoke with a conventional misconvergence correction device.

(A) and (b) of FIG. 4 are equivalent circuit diagrams of FIG.

5 is a magnetic field generation diagram according to (a) and (b) of FIG.

6 is a schematic diagram of a misconvergence correction apparatus according to the present invention.

7 is an equivalent circuit diagram of FIG.

(A) and (b) of FIG. 8 are magnetic field generation diagrams according to FIG.

9 is a screen state diagram in which misconvergence occurs according to FIGS. 6 to 8.

* Description of the symbols for the main parts of the drawings *

1: deflection yoke, 2: coil separator,

3a, 3b: horizontal deflection coil, 4a, 4b: vertical deflection coil,

5a, 5b: Ferrite core, 6a, 6b: U-shaped iron piece,

7a, 7b: coma precoil, 8a, 8b: switching diode,

9a, 9b: correction coil, 10a: upper drum core,

10b: lower drum core, 11: magnetic material

The present invention relates to a misconvergence correction device, and more specifically, the blue (B) beam is scanned to the corner of the screen on the left side of the screen, and the screen of the red (R) beam is on the right side of the screen. Magnets, drum cores, and coma-free coils mounted on a vertical axis mounted on the neck of the deflection yoke to compensate for misconvergence, ie, mis-convergence in the Y-axis, The present invention relates to a misconvergence correction device that connects drum coils so that the amount of current applied to the U-shaped iron piece and the coma precoil can be varied during the upper deflection and the lower deflection of the vertical deflection coil.

Generally, the deflection yoke 1 as shown in FIG. 1 is mounted inside the coil separator 2 and the coil separator 2 forming the external structure of the deflection yoke 1 to deflect the electron beam in the horizontal direction. A pair of horizontal deflection coils 3a and 3b for generating a horizontal deflection magnetic field and a pair of vertical deflection coils mounted outside the coil separator 2 to generate a horizontal deflection magnetic field for deflecting the electron beam in a vertical direction. 4a) (4b) and a pair of magnetic bodies, i.e., ferrite cores 5a, mounted to surround the vertical deflection coils 4a and 4b to reinforce the vertical deflection magnetic fields generated in the vertical deflection coils 4a and 4b. 5b) and a pair of core clamps (not shown) for fixedly coupling the pair of ferrite cores 5a and 5b.

The deflection yoke (1) having such a structure is mounted on the rear neck portion of the cathode ray tube, and a magnetic field is generated when the sawtooth wave pulse voltage is applied to the horizontal deflection coils 3a, 3b and the vertical deflection coils 4a, 4b. The red (R), green (G), and blue (B) electron beams emitted from the electron gun are deflected by the magnetic force to form a screen.

In the case described above, however, the horizontal and vertical deflection magnetic fields are applied due to the characteristics of the horizontal deflection coils 3a and 3b and the vertical deflection coils 4a and 4b which constitute the deflection yoke 1. Misconvergence occurs because the received and deflected electron beams are not accurately scanned at each pixel of the screen.

As shown in FIG. 2 of such misconvergence, the red (R) beam is scanned to the corner of the screen on the right side of the screen, and the blue (B) beam is scanned to the corner of the screen on the left side of the screen. In order to correct the Y-axis horizontal misconvergence, a pair of c-shaped iron pieces 6a and 6b are conventionally mounted on the neck vertical axis of the deflection yoke 1 as shown in FIG. Comapricoil (7a) (7b) was wound in the (6b) with a predetermined number of turns.

Here, as shown in FIG. 4A, a pair of coma precoils 7a and 7b wound on the U-shaped iron pieces 6a and 6b were connected in series to the vertical deflection coils 4a and 4b, respectively. In the case where the coma precoils 7a and 7b are configured in parallel, the predetermined current applied from the vertical deflection coils 4a and 4b operates the coma precoils 7a and 7b. As the magnetic fields M1 and M2 shown are generated, the same amount of misconvergence as the misconvergence generated on the left and right sides of the screen is generated at the center of the screen, and the vertical deflection generated by the vertical deflection coils 4a and 4b. The magnetic field is corrected to simultaneously correct the misconvergence occurring at the left and right sides and the center of the screen.

However, in this case, since the respective magnetic fields (M1, M2) are generated at the time of the upper deflection and the lower deflection at the same time, due to the interference of the magnetic field (M1) and the magnetic field (M2) can not generate the correct amount of misconvergence correction There was a problem that the amount of misconvergence generated on the left and right sides and the center of the screen is different.

Also, as shown in FIG. 4B, each switching diode 8a and 8b is placed in front of a pair of coma precoils 7a and 7b connected in series to the vertical deflection coils 4a and 4b. In the case of mounting in both directions, the predetermined current applied from the vertical deflection coils 4a and 4b is one of the coma precoils 7a and 7b switched by the switching diodes 8a and 8b. The forward-connected diode 8a is turned on so that only the magnetic field M1 shown in FIG. 5 is generated. In the lower deflection, the diode 8b connected in the reverse direction among the pair of diodes 8a and 8b is turned on. Only the magnetic field M2 shown in FIG. 5 is turned on. Therefore, the above-mentioned misconvergence is simultaneously generated on the left and right sides and the center portion of the screen, and the vertical deflection magnetic field generated in the vertical deflection coils 4a and 4b is corrected to simultaneously generate the left and right sides of the screen. Misconvergence was corrected.

In this case, however, the predetermined current applied to the coma precoils 7a and 7b causes a current loss caused by the switching diodes 8a and 8b to generate a sufficiently large misconvergence correction field. There was a problem in that the amount of misconvergence generated in the left and right and the center of the different.

The present invention has been made to solve the above problems, and an object of the present invention is to increase the strength of the misconvergence correction magnetic field generated in the coma pricoil during the upper deflection and the lower deflection, thereby generating a misconvergence correction magnetic field with a sufficient size. In other words, the present invention provides a misconvergence correction device that generates equal amounts of misconvergence on the left and right sides and the center of the screen.

A feature of the misconvergence correction apparatus according to the present invention for achieving the above object is a vertical deflection coil mounted on the deflection yoke to generate a deflection magnetic field for deflecting the electron beam in the vertical direction, and a red beam at the center of the screen. A misconvergence correction device comprising: a pair of coma-free coils for generating respective predetermined magnetic fields in the upper deflection and the lower deflection so as to scan the blue beam and the blue beam alternately; A correction coil is wound in a forward direction to be connected between the vertical deflection coil and the comma-free coil so as to generate a misconvergence correction magnetic field in a predetermined direction during the upward deflection, and in a direction opposite to the upper deflection during the downward deflection. Upper and lower drum cores connected in parallel with the correction coil wound in the forward direction to generate a convergence correction magnetic field and the correction coil wound in a reverse direction; It is mounted between the upper and lower drum cores so as to face the magnetized surfaces of the upper and lower drum cores, and cancels the magnetic field generated by the lower correction coil in the upper deflection and the magnetic field generated in the upper correction coil in the lower deflection. A magnetic substance that generates a predetermined magnetic field so as to cancel out is provided.

Hereinafter, one preferred embodiment of the misconvergence correction apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a schematic diagram of the misconvergence correction apparatus according to the present invention. In FIG. 6, the same reference numerals as those of (a) and (b) of FIG. 4 denote the same parts, and thus description thereof will be omitted. Only essential components of the invention are described.

6 and 7, the vertical deflection coils 4a, 4b and comapricoils 7a, 7b are connected in series so that the misconvergence correction magnetic field is changed in different directions during the upper deflection and the lower deflection. A pair of correction coils 9a and 9b to be generated and each of the correction coils 9a and 9b are wound to generate a magnetic field in a predetermined direction in which a predetermined current is applied to the correction coils 9a and 9b. The N-pole magnetized between the lower drum core 10a and 10b and the upper and lower drum cores 10a and 10b is mounted to face the upper drum core 10a, and the magnetized S-pole is connected to the lower drum core ( And a magnetic body 11 mounted so as to face 10b) to generate a predetermined magnetic field in one direction. The misconvergence correction device having such a configuration includes a U-shaped iron piece 6a and a coma precoil 7a mounted on the upper side of the neck portion of the deflection yoke 1 during the upper deflection as shown in Fig. 8A. A magnetic field in the downward direction is generated in the connected upper drum core 10a and the correction coil 9a, and the lower drum connected to the U-shaped iron piece 6b and the coma precoil 7b mounted below the neck of the deflection yoke 1. An upward magnetic field is generated in the core 10b and the correction coil 9b.

Therefore, the upward magnetic field generated in the lower drum core 10b cancels out from the lower magnetic field generated in the magnetic body 11 and only the lower magnetic field generated in the upper drum core 10a remains. M3 and M4 occur as shown in FIG. 8A. As a result, deflection forces F5 and F6 generated by the magnetic field M3 are generated so that the red (R) beam is deflected to the right and the blue (B) beam is deflected to the left above the center portion of the screen.

On the other hand, when the lower deflection as shown in (b) of FIG. 8, the upper drum core (10a) connected with the c-shaped iron piece (6a) and the coma precoil (7a) mounted on the neck portion of the deflection yoke (1) And a lower magnetic field generated in the upward direction from the correction coil 9a and connected to the lower c-shaped iron piece 6b and the comapricoil 7b mounted on the lower side of the neck of the deflection yoke 1 and the correction coil. A magnetic field in the downward direction is generated at 9b.

Therefore, the upward magnetic field generated by the upper drum core 10a is canceled with the lower magnetic field generated by the magnetic body 11 and only the lower magnetic field generated by the lower drum core 10b remains. M5 and M6 occur as shown in FIG. 8B. As a result, deflection forces F7 and F8 generated by the magnetic field M6 are generated so that the red (R) beam is deflected to the right and the blue (B) beam is deflected to the left below the center portion of the screen.

Through this process, as shown in FIG. 9, a misconvergence having the same size and shape as the misconvergence generated on the left and right sides of the screen is generated in the central portion of the screen, and is generated in the vertical deflection coils 4a and 4b. By correcting the vertical deflection field, the misconvergence generated at the left and right sides and the center of the screen is simultaneously corrected.

As described above, according to the misconvergence correction device according to the present invention, in the case of the upward deflection, the magnetic field generated in the upper c-steel bar is emphasized, and in the case of the downward deflection, the magnetic field generated in the lower c-steel bar is connected in series with the c-steel bar. By providing each drum core, a correction coil, and a magnetic material, it is possible to prevent the interference of the upper and lower misconvergence correction magnetic fields, and to generate a sufficient magnitude of the misconvergence correction magnetic field, which has the advantage of accurately correcting the misconvergence.

Claims (1)

Vertical deflection coils mounted on the deflection yoke to generate deflection magnetic fields for deflecting the electron beam in the vertical direction and predetermined magnetic fields in the upper deflection direction and the lower deflection direction so as to scan the red beam and the blue beam at the center of the screen to be offset from each other. A misconvergence correction apparatus having a pair of coma precoils for generating a; The correction coil is wound in a forward direction so as to be connected between the vertical deflection coil and the coma precoil so as to generate a misconvergence correction magnetic field in a predetermined direction during the upward deflection, and in a direction opposite to the upper deflection during the downward deflection. Upper and lower drum cores connected in parallel with the correction coil wound in the forward direction to generate a convergence correction magnetic field and the correction coil wound in a reverse direction; It is mounted between the upper and lower drum cores so as to face the magnetized surfaces of the upper and lower drum cores, and cancels the magnetic field generated by the lower correction coil in the upper deflection and the magnetic field generated in the upper correction coil in the lower deflection. And a magnetic material generating a predetermined magnetic field so as to cancel.