KR950003108Y1 - Mis-convergence compensating apparatus - Google Patents

Abstract

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Description

Miss Convergence Corrector

1A and 1B are front views of a general deflection yoke and a screen state diagram showing a VCR phenomenon occurring on a screen.

2A and 2B are plan views of a conventional misconvergence correction apparatus.

3 is a circuit diagram of FIGS. 2A and 2B.

4 is a plan view of the misconvergence correction apparatus according to the present invention.

5 is a circuit diagram of FIG.

6A and 6B show magnetic force lines and deflection forces in the upper and lower deflection of the misconvergence correction apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

DY: Deflection yoke Rx (x = 1 ~ 4): Variable resistor

VC: Vertical deflection coil →: Magnetic lines

F: Deflection Force L1: C / F Coil

L2, L3: first and second upper YH correction coils

L4, L5: first and second lower YH correction coils

The present invention relates to a misconvergence correction device of a deflection yoke, and more particularly, to prevent a vertical center raster (VCR) occurring in a deflection yoke and to prevent beams between upper and lower screens. The present invention relates to a misconvergence correction device that can individually adjust dispersion (hereinafter referred to as YH).

In general, a cathode ray tube (CRT) such as a TV receiver or a monitor is equipped with a deflection yoke for deflecting an electron beam emitted from an electron gun to form a screen by scanning the electron beam in a predetermined manner.

As the size of the screen increases, the plane becomes smaller, the pixels become smaller, and the thickness of the CRT becomes thinner, the deflection angle becomes larger and the importance of the deflection yoke is increasing day by day.

A typical deflection yoke (DY) is a pair of horizontal deflection coils (not shown) inside the coil separator 13 including the neck portion 11 and the screen portion 12 as shown in FIG. 1A. Is mounted, and a pair of vertical deflection coils VC are mounted outside the coil separator 13, and a terminal board 14 for connection with a misconvergence correction device is formed on one side.

Therefore, the sawtooth wave is applied to the vertical deflection coil VC and the horizontal deflection coil so that the red (R), green (G) and blue (B) electron beams emitted from the electron gun determine the dice on the screen as the magnetic field is formed. do.

However, as shown in FIG. 1B, the sensitivity of the magnetic force of the G-beam located in the center of the inline array electron guns is smaller than that of the R-beam B-beam located on both sides, so that the G-beam is scanned inside the screen. VCR phenomenon occurs.

In order to prevent this, the field regulator of the magnetic material is installed in the electron gun of the cathode ray tube to increase the sensitivity of the G beam, but the field regulator deteriorates due to the heat generation due to the fixation and the high frequency of the cathode ray tube, or the leakage of the deflection yoke. Since the eddy current phenomenon occurs under the influence of the magnetic field, remove the field regulator from the electron gun and remove the COMA FREE COIL (hereinafter, C / F coil) on the top of the deflection yoke as shown in FIG. It will be referred to as).

The C / F coil, which is a conventional misconvergence correction device that corrects the VCR phenomenon by replacing the field adjuster as described above, has two examples as shown in FIGS. 2A and 2B.

In the case of FIG. 2A, a deflection yoke is formed by winding a C / F coil 21 connected in series with a vertical deflection coil VC to a connection piece of a pair of correction members 20 formed by stacking a plurality of thin E-shaped iron pieces. Installed on the neck 11 of the DY so as to face each other, thereby increasing the deflection force F of the G-beam to prevent the VCR phenomenon, and as shown in FIG. 3, a variable resistor (C) in the C / F coil 21 R1) was connected in parallel, and the deflection force F was appropriately adjusted by adjusting the amount of current flowing through the C / F coil 21.

On the other hand, according to Figure 2b showing another embodiment of the conventional C / F coil, a variable resistor (C) in the C / F coil 26 to the connection piece of the pair of correction members 25 in which a plurality of thin c-shaped iron pieces are laminated As connected in parallel with R1), the C / F coil 26 not only prevents the VCR phenomenon by increasing the deflection force F of the G beam, but also adjusts the upper and lower YHs together.

In this case, in the vertical deflection coil VC, when the upward deflection occurs, the Y side becomes + and the G side becomes-to form a magnetic field as shown in FIGS. 2a and 2b, thereby causing the deflection force F to act. Raise the beam. In the case of downward deflection, the opposite is the case.

The C / F coils of the conventional misconvergence correction apparatus described above can prevent only the VCR phenomenon because only the deflection force F of the G beam is increased when the E-shaped iron piece is used. In addition, when using the U-shaped coil, only the deflection force (F) of the G-beam is improved to prevent the VCR phenomenon and to correct up to YH on the upper and lower sides of the screen. In this case, since the YH of the upper and lower sides of the screen is simultaneously changed, it is difficult to find the optimal condition, which makes it difficult to correct misconvergence.

Therefore, the purpose of this invention is to prevent the VCR phenomenon by increasing the deflection force (F) of the G-beam, and also to find the optimal conditions according to the misconvergence correction by easily correcting the YH on the upper and lower sides of the screen separately. It is possible to provide a misconvergence correction device that is easy to operate.

A feature of the misconvergence correction device according to the present invention for achieving the above object is that the upper YH correction coils and the lower YH correction coils are wound on the connecting pieces of the pair of E-shaped correction members, respectively, for adjusting the upper and lower deflection force. Connected in parallel with a variable resistor, a Comafree coil is again wound on the connecting pieces of the upper YH correction coils and the lower YH bore coils, connected in parallel with the variable resistors for vertical center raster distortion correction, and a vertical deflection coil. Is in series with.

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

4 and 5 are a plan view and a circuit diagram of a misconvergence correction apparatus according to an embodiment of the present invention, and are formed by stacking a plurality of thin E-shaped iron pieces and installed to face each other. The C / F coil L1 is wound around the connecting pieces 30-a, 30-b, 31-a, and 31-b, and is connected in series with the vertical deflection coil VC. The C / F coil L1 is connected in parallel with the first and second variable resistors R1 and R2 to adjust the amount of current flowing in the coil, and the C / F coil L1 and the first and second The VCR adjusting section is composed of variable resistors R1 and R2. In this case, the first and second variable resistors R1 and R2 may be replaced with one variable resistor.

In addition, the first and second upper YH correction coils L2 wound on upper connection pieces 30-a and 31-a of the first and second correction members 30 and 31 and connected in series with each other. ), (L3) is connected in parallel with the third variable resistor (R3), the lower connection pieces (30-b), (31-b) of the first and second compensation members (30), (31) The first and second lower YH correction coils L4 and L5, which are wound around and connected in series with each other, are connected in parallel with the fourth variable resistor R3 to be in series with the second upper YH correction coil L3. It is connected.

The first and second upper YH correction coils L2 and L3 and the first and second lower YH correction coils L4 and L5 may be connected in parallel to each other, and the C / F correction coil L1 may be connected in parallel. Is wound on top or bottom of the

In addition, the first, second, third and fourth variable resistors (R1), (R2), (R3), (R4) is mounted on a separate PCB or terminal board of the deflection yoke (DY), and The triad resistor R3 adjusts the amount of current in the first and second upper YH correction coils L2 and L3, and the fourth variable resistor R4 is used in the first and second lower YH correction coils L4, Adjust the amount of current (L5).

Referring to FIGS. 6A and 6B showing magnetic force lines and deflection forces of upper and lower deflections of the misconvergence correction apparatus according to the present invention shown in FIGS. 4 and 5, the vertical deflection coil ( In the case of FIG. 6A, which is the upward deflection in VC), the Y side becomes the + side and the G side is-, and the upper deflection force F1 acts by the magnetic lines to raise the G beam. In addition, the current passing through the VCR correction coil L1 is R beam as shown in FIG. 6B by the first and second upper YH correction coils L2 whose current amount is controlled by the third variable resistor R3. And the left and right deflection forces F3 and F4 of the G-beams are corrected for YH at the top of the screen.

On the other hand, in the case of the lower deflection shown in FIG. 6B, since the current flows in the opposite direction, the G beam is deflected downward by the deflection force F1 formed by the VCR correction coil L1, and the first and second lower YH correction coils. The lower YH of the R beam and the B beam is corrected by the magnetic lines F2 and F3 formed by (L4) and (L5).

As described above, the present invention is a misconvergence correction device for correcting the VCR phenomenon in which the G beam does not coincide with the screen and YH, which is a horizontal dispersion of the upper part of the screen. Each of the coils can be separately adjusted to adjust the amount of current of each coil so that the VCR, YH at the top of the screen, and YH at the bottom of the screen can be corrected separately.

Therefore, the misconvergence correction device according to the present invention can easily find the optimum condition of the screen by separately compensating the VCR phenomenon and the YH of the upper and lower sides of the screen, thereby realizing high image quality, and the adjustment of the misconvergence correction device is simple. .

Claims (1)

Upper YH correction coil L2, L3 on the pair of connecting pieces 30-a, 30-b, 31-a, 31-b of the pair of E-shaped correction members 30, 31 ) And the lower YH correction coils L4 and L5 are respectively wound and connected in parallel with the upper and lower deflection force adjusting resistors R3 and R4, and the upper YH correction coils L2 and L3 and Comapri coil L1 is again wound on the connecting pieces 30-a, 30-b, 31-a, and 31-b where the lower YH correction coils L4 and L5 are wound and are vertical. A misconvergence correction device connected in parallel with the variable resistors (R1) and (R2) for center raster distortion correction, and connected in series with the vertical deflection coil (VC).