JPS62281243A - Misconvergence correcting device - Google Patents

Abstract

PURPOSE:To make misconvergence correctable by itself, by installing a pair of auxilairy coils generating a local magnetic field by a vertical deflecting current, in the specified position in both directions of a deflection yoke, and correcting the corner bow lateral misconvergence by means of a longitudinal magnetic field. CONSTITUTION:At a deflection yoke 1, there is produced a longitudinal local magnetic field in the opposite direction to each other left and right at both left and right ends due to a vertical deflecting current by a pair of auxiliary coils 2a, 3a and 2b, 3b in addition to a horizontal deflecting magnetic field and a vertical deflecting magnetic field. Therefore, on an X-axis, this longitudinal local magnetic field is zero, and this longitudinal local magnetic field is made larger in proportion as going to the corner, whereby corner bow lateral misconvergence can be corrected. In this case, intermediate misconvergence such as intermediate cross convergence, corner S-shaped misconvergence, intermediate S-shaped misconvergence, etc., is one that a red beam and a blue beam are deflected in a longitudinal direction, so that it will not be varied at this longitudinal magnetic field. With this constitution, the corner bow lateral misconvergence is correctable by itself by these auxiliary coils 2a, 2b and 3a, 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a misconvergence auxiliary device for correcting corner bow-shaped lateral misconvergence of a color picture tube of a color television receiver.

[Summary of the invention]

The present invention relates to a misconvergence correction device for correcting corner-bow lateral misconvergence of a color picture tube of a color television receiver, in which a pair of vertical deflection currents are used to generate local magnetic fields at predetermined left and right positions of a deflection yoke. A pair of auxiliary coils are provided, and the pair of auxiliary coils generates a magnetic field in the opposite direction to the vertical deflection magnetic field, and also generates longitudinal magnetic fields in opposite directions, and this longitudinal magnetic field causes a corner arcuate transverse misconvergence. By correcting this, it is possible to correct the misconvergence related to the intermediate portion, such as intermediate cross misconvergence, corner 8-shaped misconvergence, middle 8-shaped misconvergence, etc. (this corner arcuate lateral misconvergence can be corrected).

[Conventional technology]

Generally, a self-convergence method is used in color picture tubes with in-line electron guns, and this is a method in which the magnetic field distribution of the deflection yoke is made appropriate; The magnetic field is shaped like a barrel, and it is possible to converge the three beams generated from the electron gun across the screen of the color picture tube.

[Problem that the invention seeks to solve]

However, the intermediate cross-misconvergence (Article 16)
, Corner 3-character misconvergence (see Figure 8)
Intermediate misconvergence, such as intermediate 3-character misconvergence (see Figure 9), is caused by cell convergence, which causes the X-axis end, Y! It is known that the misconvergence at the +h end and part of the corner increases by combining them. As the accuracy of convergence becomes higher, these intermediate misconvergence have become a problem, but the correction characteristics are related to the correction characteristics of the corner arcuate lateral misconvergence (see Figure 6), and the horizontal misconvergence of this deflection yoke is When adjusting and correcting the magnetic field and the vertical magnetic field, there is an inconvenience that one of them becomes good (and the other becomes bad).For this reason, in the past, it was inconvenient that the balance between the two could be maintained and each could only be corrected to a certain extent. A misconvergence correction device for a self-convergence type color picture tube was previously proposed in Japanese Patent Publication No. 61-3151, but this device corrects the misconvergence when attaching the deflection yoke of a self-convergence type color picture tube to the picture tube. This method corrects as a whole the asymmetrical 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 method that corrects symmetrical misconvergence such as corner-bow transverse misconvergence.

In view of this, it is an object of the present invention to make it possible to correct the corner arcuate lateral misconvergence independently without affecting the correction of the misconvergence in the intermediate portion.

[Means for solving problems]

As shown in FIG. 1, the misconvergence correction device of the present invention includes a pair of auxiliary coils (2a) that generate a local magnetic field by a vertical deflection current at predetermined positions on the left and right sides of a deflection yoke (1).
(3a) (2b) (3b) are provided, and the pair of auxiliary coils (2a), (3a) and (2b),
(3b) each generates a magnetic field in the opposite direction to the vertical deflection magnetic field, and also generates a longitudinal magnetic field in opposite directions, and corrects the corner arcuate transverse misconvergence by this longitudinal magnetic field. It is.

[Effect]

According to the present invention, vertical local magnetic fields are generated on the left and right sides of the deflection yoke (1) by the vertical deflection current, so on the X-axis, this local magnetic field is zero, and when going to the corner ( As the local magnetic field increases, it is possible to correct the corner arcuate transverse misconvergence (No. 68U), and in this case, the intermediate cross convergence (No. 71D), the corner 3-shaped misconvergence (Fig. 8), and the intermediate S-shaped misconvergence. Intermediate misconvergence such as (Figure 9) is a misconvergence in which the red (R) beam and blue (B) beam are shifted in the vertical direction, so it does not change with this vertical magnetic field, and the auxiliary coils (2a) (2b )(3
a) (3b) allows the corner arcuate lateral misconvergence (FIG. 6) to be corrected independently. 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〕

Hereinafter, one embodiment of the misconvergence correction device of the present invention will be described with reference to FIG.

In Fig. 1, (1a) and (1b) are the deflection yoke (1
) shows upper and lower cores formed in a so-called trumpet shape along the funnel part of a color picture tube (not shown), and the central parts of the upper and lower cores (1a) and (1b), respectively. The toroidal coils constituting the vertical deflection coils (4a) and (4b) are respectively wound around the core (la
) (lb), a horizontal deflection coil (not shown) constituted by a horn-shaped coil is disposed inside the deflection yoke (11) as is well known.

In this example, auxiliary coils (2a) and (3a), which are toroidal coils, are attached to the core (1a) at positions approximately 70° apart from the center of the vertical deflection coil (4a) to the left and right, respectively. Vertical deflection coil (4b)
An auxiliary coil (2b) consisting of a toroidal coil and (
3b) is wound around the core (1b). In this case, the number of turns of the auxiliary coils (2a), (2b), (3a), and (3b) is a number designed in advance according to the corner-arch lateral misconvergence that occurs.

Also in this case, auxiliary coils (3a), (3b) and (2
a) and (2b) are each reversely wound, and the auxiliary coil (
3a) and (2a) and (3b) and (2b) are respectively wound in the same direction. ), a series circuit of a vertical deflection coil (4b) and an auxiliary coil (2b) are connected 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 is made into a pink-shaped magnetic field, and the vertical magnetic field is made into a barrel-like form.

In Figure 1, (6a) and (6b) are the upper core (1
This is a clip for combining and fixing a) and the lower core (1b).

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

Since this example is configured as described above, a pair of auxiliary coils (2a) (3a), (2b) (3
b), the vertical deflection current generates vertical local magnetic fields at the left and right ends, with the left and right sides in opposite directions, as shown in Figure 3. The local magnetic field in the direction is zero, and the local magnetic field in the longitudinal direction increases toward the corner, making it possible to correct the corner arcuate transverse misconvergence (FIG. 6). In this case, intermediate misconvergence such as intermediate cross convergence (Fig. 7), corner 8-character misconvergence (181), intermediate 8-character misconvergence (Fig. 9), etc. are red (R).
Since the beam and the blue (B) beam are shifted in the vertical direction due to the yuzu convergence, this vertical magnetic field does not change, and the auxiliary coils (2a) (2b) (3a) (3b) cause the corner arcuate transverse misconvergence (Figure 6). ) can be corrected independently.

In addition, in this case, this corner arcuate lateral misconvergence (Fig. 6), intermediate cross misconvergence (Fig. 7), corner character 8 misconvergence (Fig. 8), and intermediate character 8 misconvergence (Fig. 9) When correcting a combination of intermediate misconvergence such as, etc., the corner arcuate lateral misconvergence will be in the negative direction (the red beam is on the right and the blue beam is on the left), so the auxiliary coil is used to correct the intermediate misconvergence. (2a) (3a) , (2b) (3b)
By passing a current so as to generate a magnetic field in the opposite direction to the magnetic field generated by the two vertically biased coils (4a) and (4b), this corner arch-shaped lateral misconvergence can be turned in the positive direction and the characteristics can be improved.

Further, FIG. 4 shows an embodiment of the pond of the present invention, and in this FIG. The auxiliary coils (2) and (3) are made of shaped coils. That is, Fig. 4 shows the vertical deflection coil (4a).
& (4b) shows the inside of cores (1a) and (1b) wound as toroidal coils, and the - side and the opposite side of the auxiliary coil (2) made of this toroidal coil are perpendicular to each other. The deflection coils (4a) and (4b) are arranged at positions approximately 70° apart from the centers of the respective centers, and the auxiliary coil (3), which is a horn-shaped coil, is
Each side and the opposite side are vertical deflection coils (4a).
and (4b), respectively, at positions spaced apart from each other by approximately 70 degrees. In this case, this auxiliary coil (2
) and (3) are wound in opposite directions, and the series circuit of auxiliary coils (2) and (3) is connected in series to the parallel circuit of vertical deflection coils (4a) and (4b) as shown in FIG. A vertical deflection current is supplied between both ends (5a) and (5b). The rest of the structure is the same as in FIG. 1.

It goes without saying that the example in FIG. 4 also provides the same effects as the example in FIG. 1.

In the above embodiment, the auxiliary coils (2a) and (3a) are used.

(2b) (3b) or auxiliary coils (2) and (3)
and the opposite side thereof at approximately 70° with respect to the center of each of the vertical deflection coils (4a) and (4b).
Although the coils are placed at angular intervals, the same effect as described above can be obtained if the coils are placed in this vicinity, that is, at angular intervals of 60° to 80° with respect to the centers of each of the vertical coils (4a) and (4b). It will be done. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations may be adopted without combining the gist of the present invention.

C Effect of the invention] According to the invention, the vertical deflection current causes the deflection yoke (11
This vertical local magnetic field is zero on the X-axis, and the closer you go to the corner of the color cathode ray tube, the larger the vertical local magnetic field becomes. Misconvergence can be corrected, and in this case, the intermediate misconvergence is a misconvergence in which the red (R) beam and the blue (B) beam are shifted in the vertical direction, so this intermediate misconvergence does not change with a longitudinal magnetic field, and this Auxiliary coil (2a) (2b)
(3a) By (3b), it is possible to correct the corner arcuate lateral misconvergence 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 by the longitudinal magnetic field on the Y-axis.

[Brief explanation of drawings]

FIG. 1 is a rear view showing one embodiment of the misconvergence correction device of the present invention, and FIGS. 2, 3, 6, 7, 8, and 9 are for the explanation of FIG. 1. Diagram provided, No. 4
The figure is a front view showing another embodiment of the present invention, and FIG. 5 is a diagram for explaining FIG. 4. (1) is a deflection yoke, (1a) and (1b) are upper and lower cores, respectively, (2a) (2b) (3a) and (3
b) are auxiliary coils, (4a) and (4b) are vertical deflection coils, and (5a) and (5b) are terminals to which a vertical deflection current is supplied. 1st cause Figure 5 Figure 3 The bow is put into the bow and Figure 6 Coop 51 Miss Contest analogy>7- Figure 8 Middle 70 pageants; lg-゛Mouse Figure 7 Prison 1%'l 5'G Miss Fushino\゛-Jianjin;,)
Figure a

Claims (1)

[Claims] A pair of auxiliary coils that generate a local magnetic field using a vertical deflection current are provided at predetermined positions on the left and right sides of the deflection yoke. to generate a magnetic field,
A misconvergence correction device, characterized in that the corner arcuate lateral misconvergence is corrected by the longitudinal magnetic field.