JPH0731989B2 - Misconvergence correction device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a misconvergence assisting device for correcting a corner bow lateral misconvergence of a color picture tube of a color television receiver.

[Outline of Invention]

The present invention relates to a misconvergence correcting device for correcting a corner bow-shaped lateral misconvergence of a color picture tube of a color television receiver, in which a pair of a pair of local magnetic fields are generated by vertical deflection currents at predetermined positions on the left and right sides of a deflection yoke. An auxiliary coil is provided, and the pair of auxiliary coils generate a magnetic field in the direction opposite to the vertical deflection magnetic field and generate a longitudinal magnetic field in the opposite direction to each other, and this longitudinal magnetic field causes a corner arc lateral misconvergence. By performing the correction, it is possible to correct the corner bow lateral misconvergence regardless of the misconvergence of the intermediate portion such as the intermediate cross miss convergence, the corner S-shaped miss convergence, and the intermediate S-shaped miss convergence.

[Conventional technology]

Generally, in a color picture tube having an in-line type electron gun, a self-convergence method is used, in which the magnetic field distribution of the deflection yoke is made appropriate, that is, the horizontal magnetic field of the deflection yoke is made into a pincushion type and the vertical magnetic field is made. Is a barrel type, and it is possible to converge the three beam bundles generated from the electron gun over the entire screen of the color picture tube.

[Problems to be solved by the invention]

However, intermediate cross miss convergence (see Fig. 7), corner S-shaped misconvergence (see Fig. 8) and intermediate S-shaped misconvergence (see Fig. 9)
It is known that the intermediate misconvergence such as the above becomes large by combining the misconvergence of the X-axis end, the Y-axis end and the corner portion on the screen of the color picture tube by making the cell convergence. These intermediate misconvergences have become a problem with the improvement of the convergence accuracy. However, the correction characteristics are related to the correction characteristics of the corner bow lateral misconvergence (see FIG. 6), and the horizontal deflection of this deflection yoke When adjusting and correcting the magnetic field and the vertical magnetic field, there is a disadvantage that if either one is improved, the other is deteriorated. For this reason, conventionally, there has been a problem that both can be balanced and only a certain degree of correction can be made. A misconvergence correction device for a self-convergence type color picture tube has been proposed in Japanese Patent Publication No. 61-3151, but this deflects when the deflection yoke of the self-convergence type color picture tube is attached to the picture tube. It corrects the asymmetric misconvergence caused by the deviation between the symmetry axis of the magnetic field distribution and the beam axis of the picture tube, and is different from the one that corrects the symmetric misconvergence such as the corner bow lateral misconvergence.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to independently correct the corner bow lateral misconvergence without affecting the correction of the misconvergence of the intermediate portion.

[Means for solving problems]

As shown in FIG. 1, the misconvergence correcting apparatus of the present invention comprises a pair of auxiliary coils (2a) (3a) for generating a local magnetic field at a predetermined position on the left and right of a deflection yoke (1) by a vertical deflection current.
(2b) and (3b) are provided, and the pair of auxiliary coils (2a),
(3a), (2b), and (3b) are designed to generate a magnetic field in the direction opposite to the vertical deflection magnetic field, and to generate longitudinal magnetic fields in the opposite directions. It is designed to correct the convergence.

[Action]

According to the present invention, the vertical deflection current is used to generate a vertical local magnetic field to the left and right of the deflection yoke (1). Therefore, the local magnetic field is zero on the X-axis, and the closer to the corner, the closer to the corner. This local magnetic field becomes large, and the corner bow lateral misconvergence (Fig. 6) can be corrected. In this case, intermediate cross convergence (Fig. 7), corner S-shaped misconvergence (Fig. 8), intermediate S-shaped misconvergence. Since the intermediate misconvergence such as Burgesson (Fig. 9) is a misconvergence in which the red (R) beam and the blue (B) beam are vertically deviated, this auxiliary coil (2a) ( The corner bow lateral misconvergence (Fig. 6) can be independently corrected by 2b), (3a) and (3b). Further, in this case, since it is a local magnetic field, there is almost no influence of this longitudinal magnetic field on the Y axis.

〔Example〕

An embodiment of the misconvergence correcting apparatus of the present invention will be described below with reference to FIG.

In FIG. 1, (1a) and (1b) show upper and lower cores formed in a so-called trumpet shape along a funnel portion of a color picture tube (not shown) constituting a deflection yoke (1). , Toroidal coils forming the vertical deflection coils (4a) and (4b) are respectively wound around the central portions of the upper and lower cores (1a) and (1b), and the toroidal coils of the cores (1a) and (1b) are wound. A horizontal deflection coil (not shown) composed of a club-shaped coil is arranged inside, and a deflection yoke (1) is constructed as is well known.

In this example, the auxiliary coils (2a) and (3a), which are toroidal coils, are placed at positions 70 degrees angularly apart to the left and right of the center of the vertical deflection coil (4a), respectively.
Auxiliary coils (2b) and (3b) consisting of toroidal coils are wound around a) and are spaced apart by about 70 ° angularly to the left and right of the center of the vertical deflection coil (4b), respectively.
Wind around b). In this case, the auxiliary coils (2a) (2b) (3
The number of turns of a) and (3b) shall be the number designed according to the pre-generated corner bow lateral misconvergence. In this case, the auxiliary coils (3a) and (3b) and (2a) and (2b) are reversely wound, and the auxiliary coils (3a) and (2a) and (3b) and (2b) are respectively wound in the same direction. The auxiliary coil (3a), the vertical deflection coil (4a) and the auxiliary coil (2
a) Series circuit and auxiliary coil (3b), vertical deflection coil (4
b) and the series circuit of the auxiliary coil (2b) are connected so as to form a parallel circuit, and a vertical deflection current is supplied between both ends (5a) and (5b). Further, in this case, the horizontal magnetic field generated in the deflection yoke has a pincushion type and the vertical magnetic field has a barrel type.

In FIG. 1, (6a) and (6b) are clips for integrally fixing the upper core (1a) and the lower core (1b), respectively.

The deflection yoke (1) constructed as described above is attached to a color picture tube having an in-line type electron gun in a conventional manner.

Since this example is configured as described above, in the deflection yoke (1), a vertical deflection current is generated by a pair of auxiliary coils (2a) (3a), (2b) (3b) in addition to the horizontal deflection magnetic field and the vertical deflection magnetic field. As shown in FIG. 3, since left and right generate longitudinal local magnetic fields in opposite directions to each other at the left and right ends, the longitudinal local magnetic field is zero on the X axis as shown in FIG. Yes, this vertical local magnetic field increases toward the corner, and the corner bow lateral misconvergence (FIG. 6) can be corrected. In this case, intermediate cross convergence (7th
Figure), corner S-shaped misconvergence (Figure 8),
Since the intermediate misconvergence such as the intermediate S-shaped misconvergence (Fig. 9) is the misconvergence in which the red (R) beam and the blue (B) beam are vertically shifted, this auxiliary coil (2a does not change). ) (2b) (3
By means of a) and (3b), corner bow lateral misconvergence (Fig. 6) can be corrected independently.

Also in this case, the corner bow lateral misconvergence (Fig. 6), the intermediate cross miss convergence (Fig. 7), the corner S-shaped misconvergence (Fig. 8), the intermediate S-shaped misconvergence (Fig. 9). When correcting the combination with the intermediate misconvergence such as, etc., the correction of this intermediate misconvergence is because this corner bow lateral misconvergence is in the negative direction (the red beam is on the right and the blue beam is on the left). Vertical deflection coil (4a) on (2a) (3a), (2b) (3b)
By passing an electric current so as to generate a magnetic field in the direction opposite to the magnetic field generated by (4b), this corner bow lateral misconvergence can be made positive and the characteristics can be improved.

FIG. 4 shows another embodiment of the present invention. In FIG. 4, auxiliary coils (2a) (2b) and (3a) (3b) consisting of the toroidal coil shown in FIG. This is a modification of the auxiliary coils (2) and (3) which are shaped coils. That is, FIG. 4 shows the inside of the cores (1a) and (1b) in which the vertical deflection coils (4a) and (4b) are wound as toroidal coils, and one side of the auxiliary coil (2) composed of the Kura-shaped coils. And the opposite sides are arranged at positions approximately 70 ° angularly apart from the centers of the vertical deflection coils (4a) and (4b), respectively, and the auxiliary coil is composed of a club-shaped coil.
(3) One side and the side opposite thereto are arranged at positions approximately 70 ° angularly apart from the centers of the vertical deflection coils (4a) and (4b), respectively. In this case this auxiliary coil
(2) and (3) are reversely wound, and the auxiliary coil (2) is provided in the parallel circuit of the vertical deflection coils (4a) and (4b) as shown in FIG.
The series circuits of (3) and (3) are connected in series so that the vertical deflection current is supplied between both ends (5a) and (5b). Others are the same as those in FIG.

It is needless to say that the same effects as those of the example of FIG. 1 can be obtained in the example of FIG. 4 as well.

In the above embodiment, the auxiliary coils (2a) (3a), (2b) (3
b) Or, one side of each of the auxiliary coils (2) and (3) and the side opposite thereto are provided at a position approximately 70 ° angularly apart from the center of each of the vertical deflection coils (4a) and (4b). However, the same operation and effect as described above can be obtained at a position in the vicinity of this, that is, at a position at an angular interval of approximately 60 ° to 80 ° with respect to the centers of the vertical coils (4a) and (4b). Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

〔The invention's effect〕

According to the present invention, the vertical deflection current generates vertical local magnetic fields to the left and right of the deflection yoke (1), and the vertical local magnetic field is zero on the X-axis, and the vertical local magnetic fields are directed to the corners of the color cathode ray tube. This local magnetic field in the vertical direction becomes larger as it goes, and this corner bow lateral misconvergence can be corrected,
In this case, since the intermediate misconvergence is a misconvergence in which the red (R) beam and the blue (B) beam are vertically deviated, the intermediate misconvergence does not change in the longitudinal magnetic field, and the auxiliary coils (2a) (2b) ( 3a) (3
By b), the corner misshapen lateral misconvergence can be corrected independently and complete correction is possible. Further, in this case, since it is a local magnetic field, there is an advantage that there is almost no influence of the longitudinal magnetic field on the Y axis.

[Brief description of drawings]

FIG. 1 is a rear view showing one embodiment of the misconvergence correcting device of the present invention, and FIGS. 2, 3, 6, 7, 8 and 9 are respectively for explaining FIG. Line chart to be served, 4th
FIG. 5 is a front view showing another embodiment of the present invention, and FIG. 5 is a diagram used for explaining FIG. (1) is a deflection yoke, (1a) and (1b) are upper and lower cores, (2a) (2b) (3a) and (3b) are auxiliary coils, respectively.
(4a) and (4b) are vertical deflection coils, and (5a) and (5b) are terminals to which a vertical deflection current is supplied.

Claims (1)

[Claims] 1. A pair of auxiliary coils for generating a local magnetic field by a vertical deflection current are provided at predetermined positions on the left and right sides of a deflection yoke.
The pair of auxiliary coils are adapted to generate a magnetic field in the direction opposite to the vertical deflection magnetic field and also generate longitudinal magnetic fields in directions opposite to each other, and correct the corner arcuate lateral misconvergence by the longitudinal magnetic field. A misconvergence correction device characterized in that