JPH11260287A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To modify a mis-landing pattern shown as a grouping and regrouping by arranging a pair of magnets at upper and lower parts, or right and left parts on the neck part side of a deflection yoke to correct track of the electron beam of a cathode-ray tube. SOLUTION: Through deflection force vectors 13R', 13B generated from a static magnet 5, and deflection force vectors 13R, 13B generated from an electron beam track correcting magnet 6, tracks of respective electron beams change from 14R, 14B to 14R', 14B' and an incident angle θ of a shadow mask 15 changes to θ', and therefore, a position where electron beams of the both sides reach a phosphor 7 is changed. By setting the magnetizing amount, the shape, and the mounting position of an electron beam track correcting magnet 6 so that this incident angle θ' is an optimal value, a mis-landing pattern shown as a grouping can be modified. For modifying a degrouping, it is recommended that the electron beam track correcting magnet 6 be mounted so as to have opposite pole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a deflection yoke mounted on a television receiver or an image display device using a cathode ray tube, and more particularly to a deflection yoke provided with a magnet for correcting the trajectory of an electron beam.

[0002]

2. Description of the Related Art In a color cathode ray tube, a static magnet is attached to a neck portion in order to converge three electron beams emitted from three electron guns on a panel side by a magnetic field. Further, in order to deflect the three electron beams by applying vertical and horizontal forces by a magnetic field, a deflection yoke is attached to an outer portion near a boundary between a neck portion and a funnel portion of the color cathode ray tube.

Further, this color cathode ray tube has three R, R, and R, respectively corresponding to red, green and blue emitted from three electron guns.
After passing through the shadow mask 15 once at a predetermined incident angle θ shown in FIG. 4A so that the centers of the beam spots of the G and B electron beams coincide with the vicinity of the center of the phosphor, they intersect each other. The electron beam trajectories 14R, 14G, and 14B that reach the phosphor 7 are designed.

[0004] However, there is a case where the deviation is caused due to a variation in parts or a variation in manufacturing. As shown in FIG. 2A, deviation of the beam spot center 10 of the beam spot 8 reaching the phosphor 7 from the phosphor center 9 is generally called mislanding. When this mislanding occurs, a color image having uneven brightness and color is obtained.

In this mislanding pattern,
In particular, when the incident angles of the electron beams R and B on both sides to the shadow mask are smaller than the set value, the phenomenon that the beam spots of R and B shift to the G beam side as shown in FIG. Name. Further, when the incident angles of the electron beams R and B on both sides to the shadow mask are larger than the set value, the phenomenon that the beam spots of R and B are shifted in the opposite direction to the grouping as shown in FIG. This is called grouping.

[0006] It is very difficult to correct such mislanding patterns such as grouping or degrouping, and in some cases, it is impossible to correct the pattern, and it is necessary to remodel the color CRT.

As means for solving this problem, there is an invention described in Japanese Patent Application Laid-Open No. 9-199052.
In this method, an electron beam trajectory correcting jig in which a pair of sheet-like magnets is fixed to a tape-like base or a flexible base is attached to a neck portion or the like of a cathode ray tube.

[0008]

However, in the above-mentioned prior art, in the process of assembling a television receiver or an image display device, an electron beam trajectory correction jig having a complicated structure must be assembled to a neck portion of a cathode ray tube. If the assembling accuracy is poor, the mislanding cannot be reliably corrected. Further, there is a problem that workability is poor and manufacturing cost is increased.

If means for simply and surely correcting the mislanding pattern referred to as the grouping and degrouping described above can be obtained, the time required for correcting the mislanding pattern and its countermeasures, as well as the manufacturing cost, can be greatly reduced.

An object of the present invention is to provide a deflection yoke that can correct a mislanding pattern called grouping or degrouping with a simple configuration.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to correct the trajectory of an electron beam of a cathode ray tube in a deflection yoke mounted on a television receiver or an image display device using the cathode ray tube. To
A pair of magnets, for example, in the form of a plate or a bar, are arranged vertically or horizontally on the neck side of the deflection yoke.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention provides a deflection yoke attached to a cathode ray tube, in which a pair of plate-shaped or rod-shaped electron beam trajectory correction magnets are arranged vertically or horizontally on the electron gun side of the deflection yoke. The deflecting force obtained by the magnetic field generated from the electron beam trajectory correcting magnet changes the trajectories of the electron beams on both sides to correct the angle of incidence on the shadow mask.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the configuration of a deflection yoke according to an embodiment of the present invention mounted on a cathode ray tube.

As shown in FIG. 1, a deflection yoke B attached to an outer portion near the boundary between the neck portion 1 and the funnel portion 2 of the color cathode-ray tube A has a pair of plate-like members above and below the end face on the neck portion 1 side. Alternatively, it has a rod-shaped beam trajectory correcting magnet 6. Reference numeral 3 denotes a panel unit, 4 denotes an electron gun, and 5 denotes a static magnet.

FIG. 3 is a view showing a magnetic field and an electron beam generated by the electron beam trajectory correcting magnet 6 attached to the deflection yoke as viewed from the panel section 3 side.

When a pair of electron beam trajectory correcting magnets 6, 6 are mounted above and below the end surface of the deflection yoke on the neck 1 side so that the polarities are in the directions shown in FIG. The generated magnetic field becomes like the deflection magnetic field 12 shown in FIG. 3, and the electron beams 11R,
11B is deflected in the direction of the deflection force vectors 13R and 13B, respectively.

FIG. 4B shows a static magnet 5.
FIG. 5 is a conceptual diagram showing a state in which an electron beam trajectory is corrected by an electron beam trajectory correction magnet attached to a deflection yoke B.

As described above, the electron beams 11 on both sides are
Since the R and 11B are deflected in the directions of 13R and 13B by the electron beam orbit correction magnet 6, the electron beams 11R and 11B are concentrated by the shadow mask 15 as before the attachment of the electron beam orbit correction magnet 6. For this purpose, as shown in FIG. 4B, the static magnets 5 arranged closer to the electron gun 4 than the electron beam trajectory correcting magnet 6 attach the 13R ', It is necessary to adjust so as to deflect the electron beams 11R and 11B in the direction of 13B '.

As described above, the static magnet 5
The trajectory of each electron beam is determined by the deflection force vectors 13R 'and 13B' generated from the magnet and the deflection force vectors 13R and 13B generated from the electron beam trajectory correction magnet 6, so that the trajectories of the respective electron beams are shown in FIG. , 14B '
And the incident angle θ to the shadow mask 15 changes to θ ′, so that the positions where the electron beams on both sides reach the phosphor 7 change. By setting the amount of magnetization, the shape, and the mounting position of the magnet 6 for correcting the electron beam trajectory so that the incident angle θ ′ becomes an optimum value, FIG.
The mislanding pattern called grouping shown in (b) can be corrected.

In the above embodiment, the structure for correcting the mislanding pattern called grouping shown in FIG. 2B has been described. However, when the degrouping shown in FIG. The electron beam trajectory correcting magnet 6 attached to the first embodiment may be attached and adjusted so as to have a polarity opposite to that of the above embodiment.

In the above embodiment, the deflection yoke B
Although the description has been given of the case where the magnets 6 for correcting the electron beam trajectory are mounted above and below the end face on the neck part 1 side, the magnets 6 for correcting the electron beam trajectory may be mounted on the left and right sides of the end face of the deflection yoke B on the neck part 1 side. .

In the above embodiment, the case where the magnet 6 for correcting the electron beam trajectory attached to the end surface of the deflection yoke neck 1 side is a simple rectangular solid (or a rectangular solid) has been described, but the same effect can be obtained. If you do, you are not particular about its shape.

[0023]

As described above, according to the present invention,
By attaching a pair of electron beam trajectory correcting magnets to the top and bottom or left and right of the end surface of the deflection yoke on the neck side, simply attaching this deflection yoke to the neck of the cathode ray tube as before, it is called grouping or degrouping. Mislanding patterns can be easily corrected.

Further, since there is no work for assembling the magnet for correcting the electron beam trajectory alone, the manufacturing cost can be reduced and the reliability of the correction of the mislanding can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a deflection yoke according to an embodiment of the present invention attached to a cathode ray tube.

FIG. 2 is a conceptual diagram showing a mislanding state and a mislanding pattern.

FIG. 3 is a conceptual diagram showing a magnetic field and an electron beam generated by an electron beam trajectory correction magnet attached to a deflection yoke when viewed from a panel unit side.

FIG. 4 is a conceptual diagram showing a trajectory correction state of an electron beam by a static magnet and an electron beam trajectory correction magnet attached to a deflection yoke.

[Explanation of symbols]

Reference Signs List A color cathode ray tube B deflection yoke 1 neck 2 funnel 3 panel 4 electron gun 5 static magnet 6 magnet for beam orbit correction 7 phosphor 8 beam spot 9 phosphor center 10 beam spot center 11R, 11G, 11B electron beam 12 deflection Magnetic field 13R, 13R ', 13B, 13B' Deflection force vector 14R, 14R ', 14G, 14B, 14B' Electron beam orbit 15 Shadow mask

Claims (1)

[Claims] In a deflection yoke mounted on a television receiver or an image display device using a cathode ray tube, a pair of upper and lower or left and right sides of a neck portion side of the deflection yoke are used to correct the trajectory of an electron beam of the cathode ray tube. A deflection yoke, wherein a magnet is arranged.