KR950000507Y1 - Distortion compensation of crt - Google Patents

Abstract

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Description

Geomechanical distortion correction device of deflection yoke

1 is a front view schematically showing a general deflection yoke.

(A) and (b) of FIG. 2 are screen states showing the geometrical distortion phenomenon caused by the conventional deflection yoke.

3 is a screen state diagram showing a mislanding phenomenon caused by a conventional deflection yoke.

(A)-(b) of FIG. 4 is a figure for demonstrating the Example of the geospatial distortion correction apparatus which concerns on this invention.

(A), (b) of FIG. 5 is a screen state diagram improved by the geometrical distortion correction apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: deflection yoke 11: neck portion

12 screen portion 13 coil separator

14: horizontal deflection coil 15: vertical deflection coil

16: ferrite core 17: core clamp

20a, 20b: Magnet

The present invention relates to a geometrical distortion correction device for deflection yoke (abbreviated as GD), and more specifically, to a plurality of diagonal lines on a neck diagonal of a deflection yoke for a dot shadow mask. The magnetic properties of the screen are improved by attaching two magnetic pieces.

In general, a self-convergence type deflection yoke used in a three electron gun inline array type CRT tube, such as a high resolution monitor, has a neck portion 11 as shown in FIG. Ferrite core 16 wound with a horizontal deflection coil 14 wound on the inner side of the coil separator 13 assembled as a pair consisting of a screen portion 12 and a vertical deflection coil 15 wound on the outer side thereof. Is assembled by the core clamp 17.

Therefore, as the teeth and pulses are applied to the horizontal and vertical deflection coils 14 and 15 of the deflection yoke 10, a magnetic field is formed, and R (red), G (green), and B (blue) are emitted from the electron gun. ) Is to deflect the dice on the screen by deflecting the electron beam.

However, in the above-described three-electron gun inline array type cathode ray tube, errors due to mechanical mechanisms such as radius of curvature and deflection yoke 10 such as scattering of horizontal and vertical deflection coils 14 and 15 are caused. As a result, as shown in FIGS. 2A, 3B, and 3, there is a problem that the characteristics of the screen are deteriorated.

First, (a) and (b) of FIG. 2 show the GD phenomenon generated by the deflection yoke 10 during matching of the cathode ray tube and the deflection yoke 10.

In addition, when scattering of the vertical deflection coil 15 occurs, as shown in FIG. 3, the impact point of the R, G, and B electron beams is shown at the corner of the screen in the microscope field (in the drawing, the circle of the greenhouse). (Indicated by a circle of a hidden line) is rotated in the direction of the arrow.

This invention is proposed to solve the above-mentioned conventional problems, and an object of the present invention is to generate on the screen by attaching a plurality of magnetic pieces facing each other on the diagonal of the neck portion of the coil separator constituting the deflection yoke. It is to provide a deflection yoke GD correction device that improves the characteristics of the screen by improving the GD phenomenon and the mislanding phenomenon.

A feature of this invention for achieving the above object is that the horizontal deflection coil is wound inside the coil separator consisting of the neck part and the screen part, and the ferrite core wound vertically is assembled by the core clamp. In the deflection yoke, there is provided a GD compensator for a deflection yoke attached to which a plurality of magnetic pieces are opposed to each other on a diagonal of the neck portion of the coil separator.

Hereinafter, the preferred embodiment of the deflection yoke GD correction apparatus according to the present invention will be described in detail by the accompanying drawings.

(A)-(d) of FIG. 4, and (a), (b) of FIG. 5 are figures which were shown in order to demonstrate the GD correction apparatus of the deflection yoke which differs in this invention, and the coil separator which comprises the deflection yoke 10 is shown. A plurality of magnetic pieces 20a, 20b are attached to the neck portion 11 of (13) on a diagonal line with each other facing each other, wherein the magnetic pieces 20a, 20b are in accordance with the tendency of the GD phenomenon. It can be selectively attached to the upper side or the lower side of the neck portion 11.

The diagonal range of the neck portion 11 is determined at an angle θ within 30 ° to 50 ° with respect to the X-X line of the screen, and preferably, the angle θ of 40 ° is preferable.

As described above, the deflection yoke 10 having the GD correction device according to the present invention has a sawtooth pulse applied to the horizontal and vertical deflection coils 14 and 15 as described above. Is formed, and the magnetic field deflects the electron beams of R, G, and B emitted from the electron gun to determine dice on the screen.

At this time, as shown in FIG. 4A, when the plurality of magnetic pieces 20a, 20b are attached to each other on the diagonal of the 2,4 injection surface determined on the upper side of the neck portion 11, As shown in Fig. 2A, the GD phenomenon generated in the clockwise direction is improved as shown in Fig. 5A.

Further, as shown in Fig. 4B, when the plurality of magnetic pieces 20a, 20b are attached to each other on diagonal lines of the 1,3 injection surface determined on the upper side of the neck portion 11, As shown in FIG. 2B, the GD phenomenon generated in the counterclockwise direction is improved as shown in FIG. 5B.

Then, as described in (a) and (b) of FIG. 4, when the magnetic pieces 20a and 20b are attached to the upper surface of the neck portion 11, the magnetic pieces 20a and 20b are attached. As the landing is inwardly directed to the site, as shown in (b) of FIG. 5, the mislanding phenomenon generated at the corner of the screen is improved, thereby accurately determining white uniformity in the cathode ray tube.

On the other hand, as shown in (c) and (d) of FIG. 4, when the plurality of magnetic pieces 20a and 20b are attached to each other on the lower side of the inner portion 11, (a), As described in (b), the same effect can be obtained, and in this case, the landings of the attachment portions of the magnetic pieces 20a and 20b are outwardly and the mislanding phenomenon is improved.

As described above, the GD compensator of the deflection yoke according to the present invention is attached so that a plurality of magnetic pieces face each other on the diagonal of the coil separator, thereby improving the characteristics of the screen by improving the GD phenomenon and the mislanding phenomenon generated on the screen. It is a useful design that can be done.

Claims (3)

In a deflection yoke in which a horizontal deflection coil is wound and mounted inside a coil separator including a neck part and a screen part, and a ferrite core wound with a vertical deflection coil is assembled by a core clamp to the outside, the neck of the coil separator 13 Geometry distortion correction device of the deflection yoke, characterized in that the plurality of magnetic pieces (20a, 20b) are attached to each other on the diagonal (11) diagonal. The device of claim 1, wherein the diagonal line of the neck part is determined at an angle θ within 30 ° to 50 ° with respect to the X-X line of the screen. The geomagnetic distortion correction apparatus according to claim 1, wherein the magnetic pieces (20a) and (20b) are selectively attached to upper and lower surfaces of the neck portion (11).