KR960006080B1 - Compensating device of misconvergence - Google Patents

Abstract

The compensating device comprises a first coil wound in one part of a ring core, the first coil being connected in series wiht a horizontal-concentrated coil; a second coil for generating a predetermined abandonment voltage by magnetic field of the first coil, the second being wound in the other part of the ring core; and a compensating coil connected with a bridge rectifier circuit for making 4-pole magnetic field with the abandonment voltage of the second coil, the compensating coil located on a neck part of a yoke.

Description

Miss Convergence Corrector

1 is a front view of a general deflection yoke.

2 is a plan view of a misconvergence correction apparatus according to the prior art.

3 is a horizontal deflection circuit diagram of a deflection yoke equipped with a conventional misconvergence correction device.

4 (a) and 4 (b) are screens showing misconvergence and corrected screen states.

5 is a horizontal deflection circuit diagram of a deflection yoke equipped with a misconvergence correction device according to the present invention.

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

* Explanation of symbols for main parts of the drawings

DY: Deflection yoke VC: Vertical deflection coil

HC: Horizontal Deflection Coil : Deflection force

Magnetic field line 11 neck portion

12 screen portion 13 coil separator

14: terminal board 16,30: misconvergence correction device

17,36: correction member 19,38: coma precoil

The present invention relates to a device for correcting misconvergence of deflection yokes, and more particularly, to a misconvergence connected to a horizontal deflection coil together with a COMA free coil to a correction member of a predetermined shape. The present invention relates to a misconvergence correction device capable of improving the horizontal deflection sensitivity by forming a correction device based on the principle of a transformer.

In general, a cathode ray tube (CRT) such as a television or a monitor is equipped with a deflection yoke (DY) for deflecting an electron beam emitted from an electron gun, thereby forming a screen by scanning the electron beam in a constant manner. As the screen is gradually enlarged and planarized, the pixels become smaller, and the thickness of the CRT becomes thinner, the deflection angle increases and the importance of the deflection yoke DY is increased to obtain high resolution.

As shown in FIG. 1 of the deflection yoke DY, a pair of horizontal deflection coils HC is mounted inside the coil separator 13 including the neck 11 and the screen 12. The vertical deflection coil VC is configured such that the coil separator 13 is externally mounted, and a terminal board 14 for connection with various correction devices is formed at one side of the neck portion 11. As a sawtooth wave of a predetermined frequency is applied to the vertical and horizontal deflection coils VC and HC to form a magnetic field, a screen is generated by deflecting red (R), green (G) and blue (B) electron beams emitted from the electron gun. Form.

However, ultra high resolution monitors require uniform electron beam focus to achieve the desired resolution, while self-convergence type deflection yokes (DY) generate magnetic fields with astigmatism. Although the convergence characteristics are good, there is a problem that the focusing characteristics deteriorate due to distortion of beam spots. Therefore, a super-resolution monitor uses a non-self convergence type deflection yoke (DY) in which the magnetic field does not have astigmatism. As shown in FIG. 4A, the non-self-converged deflection yoke DY generates horizontal misconvergence in the horizontal direction of the screen.

As shown in FIG. 2, the horizontal misconvergence is corrected by rectifying and supplying a current flowing in the horizontal deflection coil HC to the misconvergence correction device 16 that generates a four-pole magnetic field.

The misconvergence correction device 16 is formed by winding coils on both sides of the protrusions 17 on both sides of the E-shaped correction member 17, which are stacked in a plurality, and the vertical center raster inside the protrusions 17. Comapricoil 19 for correcting the back is formed spaced apart from the coil by a safety distance.

As shown in FIG. 3, the horizontal deflection circuit of the deflection yoke DY equipped with the misconvergence correction device 16 is connected to the pair of horizontal deflection coils HC connected in parallel. ) Is crowded. In the horizontal deflection circuit, input and output terminals are connected to the R and B beams. In addition, the current applied to the horizontal deflection coil HC is rectified by the four diodes D, and linearly deflects the R beam and the B beam in a direction in which the R beam and the B beam are separated from each other by a four-pole magnetic field by the coil 18. b) As shown in the figure, misconvergence is corrected.

The above-described conventional misconvergence correction device is connected in series with a horizontal deflection coil, so that the impedance of the coil lowers the sensitivity of the horizontal deflection circuit. In addition, in order to prevent mutual interference between the coil of the misconvergence correction device and the coma precoil, a safety distance must be maintained, and the neck portion of the deflection yoke is increased, and wiring is difficult, such as a wiring groove formed separately between the two devices. have.

Accordingly, an object of the present invention is to provide a misconvergence correction apparatus capable of minimizing a decrease in sensitivity of a horizontal deflection circuit. Another object of the present invention is to provide a misconvergence correction device that can reduce the size of the neck portion of the deflection yoke because wiring does not occur without maintaining a safe distance from the coma precoil, and the wiring can be easily performed.

In order to achieve the above objects, the present invention provides a misalignment correction device for a deflection yoke having horizontal and vertical deflection coils provided on the inner and outer sides of a coil separator having a neck and a screen. A primary coil connected in series and wound on one side of the linker, a secondary coil wound on the other side of the ring core and generating a predetermined induced voltage by a magnetic field induced by the primary coil, and a deflection yoke It is characterized by a misconvergence correction device mounted on the neck of the correction coil having a correction coil which is installed to form a four-pole magnetic field by the induced voltage of the secondary coil.

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

5 is a horizontal deflection circuit diagram of a deflection yoke equipped with a misconvergence correction device 30 according to the present invention, in which a primary coil 31 connected in series to a pair of horizontal deflection coils HC connected in parallel is at least Is wound on one side of the ring core 32 by the number of turns N1, for example, and the secondary coil 33 on the other side of the ring core 32 has a predetermined number of times N2, for example, five times. It is wound. In addition, both ends of the secondary coil 33 are connected to the bridge rectifier circuit 34 composed of four diodes (D), and the other ends of the bridge rectifier circuit 34 are connected in series to each other to form a 4-pole. It is connected with four correction coils 35 which form a magnetic field.

At this time, the misconvergence correction device 30 is formed on the outer side of both side projections 37 of the correction member 36 in which a plurality of E-shaped iron pieces are stacked, as shown in FIG. Comaprecoils 38 are formed inside the protruding pieces 37 of the 36.

The misconvergence correction device 30 applies a principle of a transformer, and a current is applied to the primary coil 31 connected to the horizontal deflection coil HC to form an induction magnetic field in the ring core 32. In addition, an induced voltage VE is generated in the secondary coil 33 by the induction magnetic field. The induced voltage VE is rectified by the bridge rectifier circuit 34 and applied to the correction coil 35. The correction coil 35 forms a four-pole magnetic field as shown in FIG. Linear deflection corrects misconvergence in the horizontal direction of the screen.

In this case, the induced voltage VE is proportional to the number of turns N1 and N2 of the primary and secondary coils 31 and 33, so that when the N1 is minimized, the inductance applied to the horizontal deflection coil HC is minimized. You can do Accordingly, the deflection force of the misconvergence correction device 30 may be adjusted by adjusting the winding number N2 of the secondary coil 33 by adjusting the induced voltage VE, which is a voltage applied to the correction coil 35. Also, if only the insulation between the primary and secondary coils 31, 33 and the ring core 32 is secured between the horizontal deflection side ends, the safety distance between the correction coil 35 and the coma precoil 38 is secured. Is unnecessary.

As described above, in the present invention, a misconvergence correction device for correcting misconvergence in the horizontal direction of a screen in a deflection yoke of an ultra-high resolution monitor is formed using the principle of a transformer. The primary coil connected to the horizontal deflection coil on one side of the ring core is wound with the minimum number of turns, and the secondary coil is wound on the other side of the ring core with a predetermined number of turns. The induced voltage (VE) induced in the secondary coil is rectified by a bridge rectifier circuit to form a 4-pole magnetic field, and applied to a correction coil installed in the neck portion of the deflection yoke to correct misconvergence.

Therefore, the present invention has the advantage of improving the horizontal deflection sensitivity by minimizing the impedance of the horizontal deflection circuit by forming the primary coil connected to the horizontal deflection circuit with the minimum number of turns. In addition, the present invention does not have to maintain a safety distance from the coma precoil correction coil installed in the neck portion of the deflection yoke when the ring core and the primary and secondary coils are insulated from the horizontal deflection coil, so that the size of the neck portion may be reduced. It is possible to simplify the wiring.

Claims (1)

A deflection yoke misconvergence correction device having horizontal and vertical deflection coils, inside and outside of a coil separator having a neck and a screen part, connected in series with the horizontal deflection coil and wound on one side of the ring core 32. A primary coil, a secondary coil wound on the other side of the ring core 32 and generating a predetermined induced voltage by a magnetic field induced by the primary coil, and mounted on the neck portion of the deflection yoke. A misconvergence correction device comprising a correction coil in which a bridge rectifier circuit is formed to form a four-pole magnetic field by an induced voltage of a secondary coil.