KR20020036586A - Deflection yoke for cathode ray tube - Google Patents

Abstract

PURPOSE: A deflection yoke of a cathode ray tube is provided to obtain stable design quality by widening a VCR pattern due to nonuniform magnetic field. CONSTITUTION: A deflection yoke of a cathode ray tube comprises a separator, a horizontal and a vertical deflection coils, a ferrite core, and four magnetic elements(16). The separator is mounted on outer boundary of a funnel. The horizontal and the vertical deflection coils are mounted on the outer surface and the inner surface of the separator. The ferrite core is mounted on the outer surface of the vertical deflection coil. The magnetic elements(16) are arranged at four corners of flange(6a) of the separator around an aperture(22) inserted into the funnel. The magnetic elements(16) moves in a horizontal direction parallel to the horizontal axis of the screen. The flange(6a) includes four mounting holes(24) for mounting the magnetic elements(16).

Description

Deflection yoke for cathode ray tube}

The present invention relates to a deflection yoke for a cathode ray tube, and more particularly, has a plurality of magnetic members that can be positioned on one flange of a separator to secure a stable design quality by widening a VCR pattern of an electron beam. To a deflection yoke for a cathode ray tube.

In general, the deflection yoke provided in the cathode ray tube functions to deflect the electron beam by generating horizontal and vertical deflection magnetic fields on the electron beam path so that the electron beam emitted from the electron gun can be scanned.

8 is a schematic diagram of a magnetic field distribution in which a known deflection yoke occurs, wherein a pair of horizontal deflection coils of the deflection yoke generates a pincushion type horizontal deflection magnetic field to deflect the electron beam in a horizontal direction, and a pair of vertical deflections; The coil generates a barrel-type vertical deflection magnetic field to deflect the electron beam in the vertical direction.

This non-uniform magnetic field distribution is intended to increase the focusing distance of the electron beam landing toward the periphery of the screen because the three-stripe electron beam concentrates inside the shadow mask toward the periphery of the screen in a uniform magnetic field distribution condition, causing mis-convergence. .

However, the above non-uniform magnetic field distribution causes mis-convergence due to coma aberration due to non-uniform magnetic flux density. In particular, the barrel-type vertical deflection magnetic field has a lower magnetic flux density at the center than the surroundings. At 12 o'clock and 6 o'clock, a BC-AL phenomenon occurs in which the deflection force of the central G beam is weaker than that of the side B (blue) / R (red) beam.

Therefore, various technical methods for correcting coma aberration have been devised. Among them, a method of adjusting a deflection yoke of a deflection yoke by attaching a field controller to a shield cup, which is an outlet of an electron gun, is typically used. Field controllers, mainly made of ferrite, reduce the deflection sensitivity of the side B / R beams and increase the deflection sensitivity of the center G beam.

However, since the field controller cannot be repositioned once it is attached to the shield cup, the magnetic field characteristics of the field controller cannot be adjusted after the electron gun is enclosed in the neck portion, and the enclosure is a distance between the end portion of the neck portion and the deflection center. The variation in the deflection sensitivity of the G-beams can be easily changed by changing the length of the V-beam.

In addition, YPB (YPB; Yoke Pull Back, distance from deflection yoke position when the landing at 3 o'clock and 9 o'clock on G beam raster is correctly adjusted and the position of the deflection yoke when it is completely in contact with the cone part of the funnel) Also, the V-Cal pattern tends to change easily due to external factors such as the deflection sensitivity of the G beam changes.

When using the field controller, as shown in FIG. 10, a VN-narrow phenomenon in which the deflected force G beam is located inside the B / R beam is mainly generated. In the pattern, the G-drop phenomenon in which the G-beams move away from the side B / R beams toward the screen periphery as well as the center of the screen is intensified, thereby deteriorating convergence at the screen periphery.

As a result, the V-Narrow pattern degrades the screen quality, such as deterioration of the purity characteristics at the periphery of the screen. Therefore, the VCR pattern must be widened to ensure stable design quality.

However, since the conventional field controller is integrally attached to the shield cup and cannot be adjusted in position, the design of the cathode ray tube such as adjusting the V-Cal pattern by using other variables affecting the deflection force of the deflection yoke in addition to the field controller is required. It has the disadvantage of making it difficult to adjust the Integrated Tube Components (ITC).

Therefore, the present invention is designed to solve the above problems,

An object of the present invention is to provide a magnetic field in the opening of one side of the separator, instead of attaching a field controller to the shield cup of the electron gun, a cathode that can secure a stable design quality by widening the V-Cal pattern by non-uniform magnetic field. To provide a tolerance deflection yoke.

Another object of the present invention is to install the magnetic member to the separator to move the position of each magnetic member while adjusting the V-Cal pattern while adjusting the V-Cal pattern adjustment operation to facilitate smooth and easy cathode ray tube deflection To provide the yoke.

1 and 2 are front and right side views of the deflection yoke according to the present invention, respectively.

3 is a partially enlarged view of a first flange on which a magnetic member is mounted.

4 is a cross-sectional view taken along a line A-A of FIG. 3.

5 and 6 are schematic views showing the magnetic field distribution according to the arrangement state of the magnetic member.

7 is a schematic representation of a VCR-wide pattern.

8 is a schematic diagram of a magnetic field distribution in which a known deflection yoke occurs.

9 is a schematic diagram of a VCR phenomenon.

10 is a schematic diagram of a VCR-narrow pattern.

In order to achieve the above object, the present invention,

A separator mounted on the outer circumferential surface of the funnel and having a pair of flanges;

Horizontal and vertical deflection coils installed inside and outside the separator to generate horizontal and vertical deflection magnetic fields into the funnel;

A ferrite core mounted to the outside of the vertical deflection coil;

It is movably mounted on one side flange of the separator facing the neck and provides a deflection yoke for a cathode ray tube including a plurality of magnetic members that change a magnetic field distribution according to a change in position to form a V-wide pattern. .

As the magnetic members are disposed closer to each other, a stronger barrel magnetic field is formed to increase the deflection sensitivity of the central G beam, thereby widening the V-CAL pattern.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are front and right side views of the deflection yoke according to the present embodiment, respectively, in which the deflection yoke 2 is mounted on the outer periphery of the funnel 4 and on the inside and the outside of the separator 6. One side flange 6a of the horizontal and vertical deflection coils 8 and 10 provided respectively, the ferrite core 12 fixed to the outside of the vertical deflection coil 10, and the separator 6 facing the neck portion 14. It includes a plurality of magnetic members 16 provided in).

The horizontal deflection coil 8 forms a pincushion type magnetic field in the vertical direction on the electron beam path to deflect the electron beam in the horizontal direction, and the vertical deflection coil 10 forms a barrel type magnetic field in the horizontal direction on the electron beam path to form the electron beam. To deflect in the vertical direction.

In addition, the ferrite core 12 is connected so that the magnetic flux directions generated from the respective coils are reversed to each other in the magnetic path, thereby improving the magnetic efficiency generated in each coil, and separating the horizontal and vertical deflection coils 8 and 10. The separator 6 includes a first flange 6a and a second flange 6b on one side facing the neck portion 14 and on the opposite side facing the screen portion, respectively.

The first flange 6a facing the neck portion 14 includes a yoke clamp 18 for fixing the deflection yoke, and a color-purifying magnet assembly 20 composed of a pair of 2-pole, 4-pole, and 6-pole magnets. Is provided, the colorization magnet assembly 20 serves to match and focus the three-stem electron beam emitted from the electron gun in one place.

Here, the deflection yoke 2 provided in this embodiment has a first flange of the separator 6 instead of attaching a field controller to the electron gun so as to widen the V-Cal pattern by the non-uniform magnetic field to ensure stable design quality. A plurality of magnetic members 16 for V-Cal correction are provided at 6a.

The magnetic member 16 is magnetized to generate a magnetic field when an external magnetic field (magnetic field generated by a deflection coil) is applied by its magnetic properties, and adjusts a V-CAL pattern by using the magnetic field. For example, the magnetic member (16) may be made of an iron-based alloy containing 68% nickel.

As shown in FIG. 2, four magnetic members 16 are provided, one mounted at four diagonal portions of the first flange 6a around the opening 22 fitted to the funnel 4. It is mounted to move the position in the horizontal direction parallel to the horizontal axis of the screen.

To this end, the first flange 6a of the separator 6 forms, for example, a plurality of mounting holes 24 for mounting the magnetic member 16. FIG. 3 shows a part of the first flange on which the magnetic member is mounted. 4 is a cross-sectional view taken along line AA of FIG. 3, wherein the four diagonal portions of the first flange 6a are provided with a pair of mounting holes 24 for fastening correspondingly to the respective magnetic members 16. Is formed.

The mounting hole 24 is elongated in the horizontal direction to fix each magnetic member 16 and serve as a guide rail to which the inserted magnetic member 16 can move in the horizontal direction. Corresponding to the mounting holes 24, a pair of extension portions 26 are formed at the bottom of each magnetic member 16, and are fitted into and fixed to the mounting holes 24.

At this time, in order to prevent the magnetic member 16 fitted to the first flange 6a from being separated from the separator 6, a projection jaw 26a is formed on the pair of extension portions 26 to form the magnetic member ( 16 is preferably fixed to the inside of the first flange 6a after being fitted into the mounting hole 24.

In this way, the four magnetic members 16 are integrally fixed to the designated positions on the first flange 6a by the mounting holes 24, and the position on the horizontal axis is adjusted by the operator after the cathode ray tube assembly. Adjust the seed pattern.

In particular, the four magnetic members 16 adjust the deflection sensitivity of the central G beam by changing their magnetic field distributions as they are arranged in close proximity to each other and far away.

More specifically, as shown in FIG. 5, when each magnetic member 16 is moved toward the outside of the deflection yoke 2 to set the distance between the respective magnetic members 16 to the maximum, As a result, the magnetic field distribution generated between the respective magnetic members 16 becomes a weak barrel magnetic field in the horizontal direction.

On the other hand, as shown in FIG. 6, when each magnetic member 16 is moved toward the deflection yoke opening 22 to set the distance between the respective magnetic members 16 to a minimum, each magnetic member ( 16) The magnetic field distribution generated between them becomes a strong barrel-type magnetic field in the horizontal direction.

Here, as the magnetic field generated between the magnetic members 16 is distributed in a strong barrel shape, the deflection sensitivity of the center G beam may be improved, and the G beams at the 12 o'clock and 6 o'clock directions of the screen may be larger.

Therefore, when the four magnetic members 16 are arranged close to each other as shown in FIG. 6 to generate a strong barrel type magnetic field, as shown in FIG. 7, the central G beam landing at the 12 o'clock and 6 o'clock directions of the screen is deflected more greatly. The V-Cal pattern can be widened.

In other words, the V-wide pattern reduces the average distance difference between the side B / R beam and the center G beam to alleviate the G-drop phenomenon in which the G beam is far from the B / R beam over the entire screen. As a result, in the BC-wide pattern, the convergence between the three electron beams can be improved, so that the screen quality can be improved and stable design quality can be realized.

As described above, the deflection yoke 2 provided in the present embodiment adjusts the horizontal axis position of each magnetic member 16 to easily widen the V-Cal pattern to realize stable design quality. Since it is possible to adjust the V-Cal pattern, it has the advantage of making the V-Cal pattern adjustment work more smoothly.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, the present invention includes a plurality of magnetic members capable of moving positions on the first flange of the separator to adjust the horizontal axis position of each magnetic member so that the V-CAL pattern can be easily widened. Therefore, the convergence between three stem electron beams can be improved, and the screen quality can be improved and stable design quality can be ensured.

In addition, after assembling the cathode ray tube, the operator can adjust the VCC pattern while watching the screen, making it easier and smoother to adjust the VAL pattern and improving the assembly efficiency and fabrication efficiency of the cathode ray tube.

Claims (6)

A separator mounted to an outer circumferential surface of the funnel and having a pair of flanges; Horizontal and vertical deflection coils respectively installed in and outside the separator to generate horizontal and vertical deflection magnetic fields into the funnel; A ferrite core mounted outside the vertical deflection coil; A deflection yoke for a cathode ray tube including a plurality of magnetic members mounted on one flange of a separator facing a neck and changing a magnetic field distribution according to a change in position to form a VCR-wide pattern. The method of claim 1, The magnetic member is provided with four, the deflection yoke for the cathode ray tube is mounted to each of the four corners around the opening of the deflection yoke. The method of claim 1, A deflection yoke for a cathode ray tube in which the magnetic member is mounted to be movable in a horizontal direction parallel to the horizontal axis of the screen. The method of claim 3, wherein A deflection yoke for a cathode ray tube for forming a pair of mounting holes in a horizontal direction corresponding to each magnetic member in one flange of the separator. The method of claim 4, wherein A deflection yoke for a cathode ray tube, wherein the magnetic member forms a pair of extensions on a bottom surface thereof facing the pair of mounting holes. The method of claim 5, A deflection yoke for a cathode ray tube, wherein the magnetic member further forms protrusions in a pair of extension portions to prevent separation from the separator.